POPULATION DYNAMICS. Zoo 511 Ecology of Fishes

Size: px
Start display at page:

Download "POPULATION DYNAMICS. Zoo 511 Ecology of Fishes"

Transcription

1 POPULATION DYNAMICS Zoo 511 Ecology of Fishes

2 Today s goals Understand why and how population dynamics are important in fisheries ecology Gain experience in a variety of mark-recapture methods

3 What are population dynamics? A population is a group of fish of the same species that are alive in a defined area at a given time (Wootton 1990) Population dynamics: changes in the number of individuals in a population or the vital rates of a population over time

4 Bluegill catch Rusty catch Major role of ecology: understand change 250 Bluegill Rusty

5 Why study population dynamics? Often most relevant response to ecosystem manipulation/perturbation Endangered species (population viability analysis, PVA) Fisheries management (sustainable yield) Understand ecosystem dynamics and ecological processes

6 Why study population dynamics? Often most relevant response to ecosystem manipulation/perturbation Endangered species (population viability analysis, PVA) Fisheries management (sustainable yield) Understand ecosystem dynamics and ecological processes Atlantic salmon PVA From Legault 2004 PVA: Modeling the probability that a population will go extinct or drop below the minimum viable population size within a given number of years.

7 Why study population dynamics? Often most relevant response to ecosystem manipulation/perturbation Endangered species (population viability analysis, PVA) Fisheries management (sustainable yield) Understand ecosystem dynamics and ecological processes from Hilborn and Walters 1992

8 Why study population dynamics? Often most relevant response to ecosystem manipulation/perturbation Endangered species (population viability analysis, PVA) Fisheries management (sustainable yield) Understand ecosystem dynamics and ecological processes When do ecological shifts occur? Are they stable?

9 How do populations change? Population

10 Density Dependence Rate of Change (per capita) Population Density

11 per capita annual increase Rate of population increase Density independent Density dependent N

12 Population density Time Population density Time Small group exercise Population starts at low density. What happens to density over time under density-dependent rate of increase? What happens if rate of increase is densityindependent? Density-dependent Density-independent

13 per capita annual increase Logistic population growth dn/dt=r 0 N(1-N/K) r 0 = maximum rate of increase K= carrying capacity r 0 N K

14 R-selected vs. K-selected Environment r-selected variable and/or unpredictable K-selected constant and/or predictable Lifespan short long Growth rate fast slow Fecundity high low Natural mortality high low Population dynamics unstable stable

15 How do populations change? N t+1 = N t + B D + I E Immigration B = births Stocking D = deaths I = immigration Births Population Deaths E = emigration Angling Emigration

16 Survival Predation Disease Prey availability Competition for food Harvest Age 1 Age 2 Age 3 Year 1 N 1,1 N 1,2 N 1,3 S Year 2 N 2,1 N 2,2 N 2,3 Year 3 N 3,1 N 3,2 N 3,3 Natural Mortality

17 Survival Eggs and larvae suffer the largest losses Egg HATCH Larva Viable & Competent Recruit! Not Fertile Inviable Starvation Eaten Eaten Other 2 cohorts each produce 10,000,000 eggs 90.5% survivorship/day yields 24,787 survivors at 60 days 95.1% survivorship/day yields 497,871 survivors at 60 days

18 Recruitment Can mean many things! Number of young-of-year (YOY) fish entering population in a year Number of fish achieving age/size at which they are vulnerable to fishing gear Somewhat arbitrary, varies among populations Major goal of fish population dynamics: understanding the relationship between stock size and recruitment

19 What determines recruitment? -Stock size (number and size of females)

20 Recruitment Density-independent Ricker What determines recruitment? Beverton-Holt spawning stock biomass (SSB) From: Wootton (1998). Ecology of teleost fishes.

21 The problem? Stochasticity!

22 From: Cushing (1996). Towards a science of recruitment in fish populations

23 Highly variable recruitment results in naturally very variable catches From: Jennings, Kaiser and Reynolds (2001). Marine Fisheries Ecology

24 Population Abundance On rare occasions, abundance can be measured directly Small enclosed systems Migration

25 Catch per unit effort (CPUE) Very coarse and very common index of abundance 1 Catch= 4 fish Effort= 4 nets for 12 hours each= 48 net hours CPUE=4/48= Catch=8 fish Effort= 4 nets for 12 hours each= 48 net hours CPUE=8/48=0.167 We conclude population 2 is 2X larger than population 1

26 Population abundance Density estimates (#/area) Eggs estimated with quadrats Pelagic larvae sampled with modified plankton nets Juvenile and adult fish with nets, traps, hook and line, or electrofishing Density is then used as index of abundance, or multiplied by habitat area to get abundance estimate

27 Depletion methods Closed population Vulnerability constant for each pass Collection efficiency constant Often not simple linear regression * N * * * Time (or pass)

28 Mark recapture M=5 C=4 R=2 N=population size=????

29

30 Modified Petersen method Assumptions: Closed population Equal catchability in first sample Marking does NOT influence catchability Marked and unmarked fish mix randomly Mortality rates are equal Marks are not lost

31 How to avoid violation of assumptions? Two sampling gears Distribute marked individuals widely; allow time for mixing Can be separated into different groups Length Sex Geographic regions

32 How many to mark/recapture? Requires some knowledge of population size! Trade-off between precision and sample size Population of 10,000: Mark 400 and examine 600 for +/- 50% OR mark 1,000 and examine 1,500 for +/- 10% Trade-off between marked and recapture sample size Population of 10,000: Mark 1,000 and examine1,500 OR Mark 4,500 and examine 500

33 Schnabel method Closed population Equal catchabilty in first sample Marking does NOT influence catchability Multiple recaptures Easier to pick up on violation of assumptions

34 Jolly Seber method Open populations Allows estimation of births and deaths Three or more sampling periods needed Equal catchability of all individuals in all samples Equal probability of survival Marks are not lost Sampling time is negligible compared to intervals between samples

35 Importance of uncertainty Confidence intervals Long-term frequency, not probablity! 95% confidence intervals if you repeated procedure an infinite number of times, 95% of the time the interval you create would contain the true value Precision vs. accuracy x x x x x x x x x x x x x x Accurate, not precise Not accurate, precise Accurate, precise

36 Lets count some beans!

A Method of Population Estimation: Mark & Recapture

A Method of Population Estimation: Mark & Recapture Biology 103 A Method of Population Estimation: Mark & Recapture Objectives: 1. Learn one method used by wildlife biologists to estimate population size of wild animals. 2. Learn how sampling size effects

More information

8.3.18 Advice May 2014

8.3.18 Advice May 2014 8.3.18 Advice May 2014 ECOREGION STOCK Baltic Sea Sprat in Subdivisions 22 32 (Baltic Sea) Advice for 2015 ICES advises on the basis of the MSY approach that catches in 2015 should be no more than 222

More information

Removal fishing to estimate catch probability: preliminary data analysis

Removal fishing to estimate catch probability: preliminary data analysis Removal fishing to estimate catch probability: preliminary data analysis Raymond A. Webster Abstract This project examined whether or not removal sampling was a useful technique for estimating catch probability

More information

The Economics of Ecosystem Based Management: The Fishery Case

The Economics of Ecosystem Based Management: The Fishery Case The Economics of Ecosystem Based Management: The Fishery Case Fisheries impact on marine ecosystem and policy implications Peder Andersen Co-authors: Lars Ravensbeck Hans S. Frost Department of Food and

More information

Logistic Paradigm. Logistic Paradigm. Paradigms. How should we consider them?

Logistic Paradigm. Logistic Paradigm. Paradigms. How should we consider them? Harvesting Paradigms Sustained Yield Harvesting Paradigms Net-Annual Increment Paradigm The Myth of MSY How should we consider them? The logistic paradigm obviously arises from logistic model. Says that

More information

REVIEW UNIT 10: ECOLOGY SAMPLE QUESTIONS

REVIEW UNIT 10: ECOLOGY SAMPLE QUESTIONS Period Date REVIEW UNIT 10: ECOLOGY SAMPLE QUESTIONS A. Sample Multiple Choice Questions Complete the multiple choice questions to review this unit. 1. All of the following are density-dependent factors

More information

10/7/2010. I. Population Demography A. Inputs and Outflows B. Describing a population C. Summary II. Population Growth and Regulation

10/7/2010. I. Population Demography A. Inputs and Outflows B. Describing a population C. Summary II. Population Growth and Regulation /7/ Population Ecology I. Population Demography A. Inputs and Outflows B. Describing a population C. Summary II. Population Growth and Regulation A. Exponential Growth B. Logistic Growth C. What limits

More information

The various relationships between the spawning stock and recruits may be: exploitation K. Limburg, lecture notes, Fisheries Science

The various relationships between the spawning stock and recruits may be: exploitation K. Limburg, lecture notes, Fisheries Science S-R II: More about stockrecruitment relationships & exploitation K. Limburg, lecture notes, Fisheries Science Last time, we discussed the following concepts about exploited populations of fish. We identified

More information

Recreational Fishpond Management

Recreational Fishpond Management Recreational Fishpond Management Enhancements to basic approaches Rusty Wright, Extension Fisheries Specialist Auburn University Alabama Extension Pond Management Why are ponds important? Huge numbers

More information

BIOE 370 1. Lotka-Volterra Model L-V model with density-dependent prey population growth

BIOE 370 1. Lotka-Volterra Model L-V model with density-dependent prey population growth BIOE 370 1 Populus Simulations of Predator-Prey Population Dynamics. Lotka-Volterra Model L-V model with density-dependent prey population growth Theta-Logistic Model Effects on dynamics of different functional

More information

FOUR (4) FACTORS AFFECTING DENSITY

FOUR (4) FACTORS AFFECTING DENSITY POPULATION SIZE REGULATION OF POPULATIONS POPULATION GROWTH RATES SPECIES INTERACTIONS DENSITY = NUMBER OF INDIVIDUALS PER UNIT AREA OR VOLUME POPULATION GROWTH = CHANGE IN DENSITY OVER TIME FOUR (4) FACTORS

More information

Management Implications Along. Michael Denson, Wallace Jenkins and Tanya Darden

Management Implications Along. Michael Denson, Wallace Jenkins and Tanya Darden Management Implications Along the Southeastern US Coast Michael Denson, Wallace Jenkins and Tanya Darden Cobia Pelagic, migratory species Commercial and recreational importance Harvests steady since 1996

More information

Maintenance of Diversity

Maintenance of Diversity Maintenance of Diversity 1. Succession 2. Loss of Diversity 3. General Mechanisms that Maintain Diversity 4. Specific Mechanisms that Maintain Diversity Maintenance of species diversity 1. Ecological succession

More information

Marine Stewardship Council

Marine Stewardship Council Marine Stewardship Council MSC Fishery Standard Principles and Criteria for Sustainable Fishing Version 1.1 1 st May 2010 Committees responsible for this Standard This standard is intended to be used on

More information

Status of bigeye tuna in the eastern Pacific Ocean in 2001 and outlook for 2002

Status of bigeye tuna in the eastern Pacific Ocean in 2001 and outlook for 2002 SCTB15 Working Paper BET-2 Status of bigeye tuna in the eastern Pacific Ocean in 21 and outlook for 22 Mark N. Maunder and Shelton J. Harley Inter-American Tropical Tuna Commission (IATTC) La Jolla, CA,

More information

Study Guide B. Answer Key. Interactions in Ecosystems

Study Guide B. Answer Key. Interactions in Ecosystems Interactions in Ecosystems Answer Key SECTION 1. HABITAT AND NICHE 1. a habitat is all of the biotic and abiotic factors in the area where an organism lives, while a niche includes all physical, chemical,

More information

9.3.7 Advice December 2014

9.3.7 Advice December 2014 9.3.7 Advice December 2014 ECOREGION STOCK Widely distributed and migratory stocks European eel Advice for 2015 The status of eel remains critical and ICES advises that all anthropogenic mortality (e.g.

More information

Hake Benchmark Assessment Meeting Schedule

Hake Benchmark Assessment Meeting Schedule Hake Benchmark Assessment Meeting Schedule Meeting Date Location Data I Aug. 23 Aquarium Conference Room Ecosystem Consumption (1) 9:00 AM 166 Water St. Data II Sep. 7 10 am 5:30 pm Sep. 8-10 9 am 5:30

More information

Population Growth Exponential and Logistic Models vs. Complex Reality 1

Population Growth Exponential and Logistic Models vs. Complex Reality 1 Population Growth Exponential and Logistic Models vs. Complex Reality 1 I. Exponential Population Growth 1a. Suppose a single bacterium is placed in a flask that contains lots of food for bacteria. In

More information

Several aspects of the natural history of the rocky intertidal barnacle can explain

Several aspects of the natural history of the rocky intertidal barnacle can explain Chapter 1 General introduction Several aspects of the natural history of the rocky intertidal barnacle can explain why it has long been exploited as an example of marine animal recruitment. The adult barnacle

More information

A. GULF OF MAINE HADDOCK ASSESSMENT SUMMARY FOR 2014

A. GULF OF MAINE HADDOCK ASSESSMENT SUMMARY FOR 2014 A. GULF OF MAINE HADDOCK ASSESSMENT SUMMARY FOR 2014 State of Stock: The Gulf of Maine haddock (Melanogrammus aeglefinus) stock is not overfished and overfishing is not occurring in 2013 (Figure A1). Spawning

More information

Demography and Age-Structured Populations. Outline

Demography and Age-Structured Populations. Outline 1 Demography and Age-Structured Populations Outline Population parameters Discrete vs. continuous events, ages vs age-classes. Life Tables Cohort vs. Static (segment) Survivorship: l x and s x Fecundity:

More information

Population Ecology. Life History Traits as Evolutionary Adaptations

Population Ecology. Life History Traits as Evolutionary Adaptations Population Ecology An Overview of Population Ecology Population ecology is the study of factors that affect population: Density Growth A population is a group of individuals of a single species that occupy

More information

3.13.5.b Gear selectivity in the directed cod fishery (BACOMA project)

3.13.5.b Gear selectivity in the directed cod fishery (BACOMA project) 3.13.5.b Gear selectivity in the directed cod fishery (BACOMA project) IBSFC has asked ICES to: i) evaluate the potential improvement in the gear selectivity in the directed cod fisheries as concluded

More information

Chapter 19 Populations & Communities

Chapter 19 Populations & Communities Chapter 19 Populations & Communities Ecology Population Dynamics Competition Shapes Communities Species Interactions/ Relationships Coevolution/symbiosis Predation/ animal defenses mimicry Levels of Ecological

More information

Columbia River Project Water Use Plan. Monitoring Program Terms of Reference LOWER COLUMBIA RIVER FISH MANAGEMENT PLAN

Columbia River Project Water Use Plan. Monitoring Program Terms of Reference LOWER COLUMBIA RIVER FISH MANAGEMENT PLAN Columbia River Project Water Use Plan LOWER COLUMBIA RIVER FISH MANAGEMENT PLAN CLBMON-45 Lower Columbia River Fish Indexing Surveys 31 August 2007 1.0 OVERVIEW LOWER COLUMBIA RIVER FISH MANAGEMENT PLAN

More information

Carey R. McGilliard November 2014. Executive Summary

Carey R. McGilliard November 2014. Executive Summary 8. Assessment of the Flathead Sole Stock in the Gulf of Alaska Carey R. McGilliard November 2014 Executive Summary Flathead sole (Hippoglossoides elassodon) are assessed on a biennial stock assessment

More information

Bitterroot Mountain Lion Project Report January 2014

Bitterroot Mountain Lion Project Report January 2014 Bitterroot Mountain Lion Project Report January 2014 Background Wildlife managers need reliable methods to monitor mountain lion population abundance in order to manage harvest, minimize conflicts with

More information

STUDY PERFORMANCE REPORT

STUDY PERFORMANCE REPORT STUDY PERFORMANCE REPORT State: Michigan Study No.: 468 Project No.: F-80-R-1 Title: Natural reproduction by walleye in Saginaw Bay Period Covered: October 1, 1999 to September 30, 2000 Study Objective:

More information

Responsible stock enhancement, restocking and sea ranching: rational and terminology

Responsible stock enhancement, restocking and sea ranching: rational and terminology Responsible stock enhancement, restocking and sea ranching: rational and terminology Devin M. Bartley FAO Rome Ecosystem-based Stock Enhancement Workshop: development of a road map to evaluate the potential

More information

Ecology - scientific study of how individuals interact with their environment 34.1

Ecology - scientific study of how individuals interact with their environment 34.1 Biology 1407 Exam 4 Notes - Ecology Ch.35-36 Ecology - scientific study of how individuals interact with their environment 34.1 - organisms have adapted to - evolved in - a particular set of conditions;

More information

RECOVERY POTENTIAL ASSESSMENT FOR THE LAURENTIAN SOUTH DESIGNATABLE UNIT OF ATLANTIC COD (GADUS MORHUA)

RECOVERY POTENTIAL ASSESSMENT FOR THE LAURENTIAN SOUTH DESIGNATABLE UNIT OF ATLANTIC COD (GADUS MORHUA) Canadian Science Advisory Secretariat Science Advisory Report 211/28 RECOVERY POTENTIAL ASSESSMENT FOR THE LAURENTIAN SOUTH DESIGNATABLE UNIT OF ATLANTIC COD (GADUS MORHUA) 68 66 64 62 6 58 5 5 49 49 48

More information

Research Advice on the Proposed Shark Mitigation Strategy using drum lines for January to April 2014. Research Division - January 2014

Research Advice on the Proposed Shark Mitigation Strategy using drum lines for January to April 2014. Research Division - January 2014 Research Advice on the Proposed Shark Mitigation Strategy using drum lines for January to April 2014 File No 2475/13 Background Research Division - January 2014 In direct response to the unprecedented

More information

Fair Trade USA Data-Limited Stock Assessment Decision Tree

Fair Trade USA Data-Limited Stock Assessment Decision Tree Fair Trade USA Data-Limited Stock Assessment Decision Tree January 31, 2014 Introduction This stock assessment decision tree may be used to determine which data-limited stock assessment methodology is

More information

WHAT TO DO IN THE EVENT OF AN ESCAPE OF FISH FROM A FISH FARM

WHAT TO DO IN THE EVENT OF AN ESCAPE OF FISH FROM A FISH FARM WHAT TO DO IN THE EVENT OF AN ESCAPE OF FISH FROM A FISH FARM Guidance on reporting an escape or suspected escape under Part 4A of the Aquatic Animal Health (Scotland) Regulations 2009 GUIDANCE September

More information

Skaguay Reservoir. FISH SURVEY AND MANAGEMENT DATA Greg A. Policky - Aquatic Biologist (Salida) greg.policky@state.co.

Skaguay Reservoir. FISH SURVEY AND MANAGEMENT DATA Greg A. Policky - Aquatic Biologist (Salida) greg.policky@state.co. FISH SURVEY AND MANAGEMENT DATA (Salida) greg.policky@state.co.us / 719-530-5525 General Information: Skaguay Reservoir, a 114 acre impoundment, offers good fishing for rainbow and brown trout with an

More information

14.1. Every organism has a habitat and a niche. A habitat differs from a niche. Interactions in Ecosystems CHAPTER 14.

14.1. Every organism has a habitat and a niche. A habitat differs from a niche. Interactions in Ecosystems CHAPTER 14. SECTION 14.1 HABITAT AND NICHE Study Guide KEY CONCEPT Every organism has a habitat and a niche. VOCABULARY habitat ecological niche competitive exclusion ecological equivalent A habitat differs from a

More information

Data Collection and Management Program Review Northeast Fisheries Science Center Summary and Response November 2013

Data Collection and Management Program Review Northeast Fisheries Science Center Summary and Response November 2013 Northeast Fisheries Science Center Introduction Data Collection and Management Program Review Northeast Fisheries Science Center Summary and Response November 2013 During August 5-8, 2013, six peer reviewers

More information

Nicolas MICHELET - CNPMEM Manchester, 13 March 2008

Nicolas MICHELET - CNPMEM Manchester, 13 March 2008 NATIONAL COMMITTEE OF MARINE FISHERIES Nicolas MICHELET - CNPMEM Manchester, 13 March 2008 International Programme for the conservation and the restoration of the European Sturgeon (Acipenser sturio) INFORMATION

More information

Sustainability Considerations for Developing an Aquatic Invertebrate & Fish Collection Plan

Sustainability Considerations for Developing an Aquatic Invertebrate & Fish Collection Plan Approved by the AZA Board of Directors on January 12, 2016 Sustainability Considerations for Developing an Aquatic Invertebrate & Fish Collection Plan AZA Position The Association of Zoos and Aquariums

More information

A comparison of sea lice on individually caught adult Pacific salmon in the coastal waters of British Columbia in August of 2004 and 2005.

A comparison of sea lice on individually caught adult Pacific salmon in the coastal waters of British Columbia in August of 2004 and 2005. NPAFC Doc. 874 Rev. A comparison of sea lice on individually caught adult Pacific salmon in the coastal waters of British Columbia in August of 2004 and 2005. by R.J. Beamish, N. Ambers, K.L. Hunter and

More information

STUDY PERFORMANCE REPORT

STUDY PERFORMANCE REPORT STUDY PERFORMANCE REPORT State: Michigan Study No.: 468 Project No.: F-53-R-15 Title: Natural reproduction by walleye in Saginaw Bay. Period Covered: April 1, 1998 to September 30, 1999 Study Objective:

More information

Hydroacoustic surveys of Otsego Lake, 2007

Hydroacoustic surveys of Otsego Lake, 2007 Hydroacoustic surveys of Otsego Lake, 2007 Thomas E. Brooking 1 and Mark D. Cornwell 2 INTRODUCTION In 2007, we sampled Otsego Lake (Otsego County, NY) with acoustics to estimate abundance of pelagic fishes

More information

Biology Chapter 5 Test

Biology Chapter 5 Test Name: Class: _ Date: _ Biology Chapter 5 Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1. What does the range of a population tell you that density

More information

Fisheries Management On Lake Vermilion In 2011

Fisheries Management On Lake Vermilion In 2011 Fisheries Management On Lake Vermilion In 2011 MN Dept. of Natural Resources Division of Fish and Wildlife Section of Fisheries 650 Highway 169 Tower, MN 55790 Phone: 218-753-2580 1 Introduction Lake Vermilion

More information

Review of productivity parameters and stock assessment options for kingfish (Seriola lalandi lalandi)

Review of productivity parameters and stock assessment options for kingfish (Seriola lalandi lalandi) Review of productivity parameters and stock assessment options for kingfish (Seriola lalandi lalandi) New Zealand Fisheries Assessment Report 2014/04 J.R. McKenzie ISSN 1179-5352 (online) ISBN 978-0-478-42353-2

More information

SEA OTTER CONSERVATION

SEA OTTER CONSERVATION SEA OTTER CONSERVATION Only three subspecies of sea otter are found in the world: the southern, or California, sea otter (Enhydra lutris nereis), the northern sea otter (Enhydra lutris kenyoni) and the

More information

CHAPTER 3. A is a certain number of individuals that make up an interbreeding, reproducing group within a given area.

CHAPTER 3. A is a certain number of individuals that make up an interbreeding, reproducing group within a given area. Review Question-1 Answer CHAPTER 3 Basic Needs of Living Things A is a certain number of individuals that make up an interbreeding, reproducing group within a given area. a. species b. population c. organism

More information

Density dependent matrix model for gray wolf population projection

Density dependent matrix model for gray wolf population projection Ecological Modelling 151 (2002) 271 278 www.elsevier.com/locate/ecolmodel Density dependent matrix model for gray wolf population projection David H. Miller a, *, Al L. Jensen a, James H. Hammill b a School

More information

Potts, J.M. 1 and C.R. Todd

Potts, J.M. 1 and C.R. Todd Developing population models for informing the sustainable management of the Murray spiny crayfish (Euastacus armatus) and the Glenelg spiny crayfish (E. bispinosus) in Victoria Potts, J.M. 1 and C.R.

More information

Update of a projection software to represent a stock-recruitment relationship using flexible assumptions

Update of a projection software to represent a stock-recruitment relationship using flexible assumptions Update of a projection software to represent a stock-recruitment relationship using flexible assumptions Tetsuya Akita, Isana Tsuruoka, and Hiromu Fukuda National Research Institute of Far Seas Fisheries

More information

SCIENCE ADVICE FROM THE RISK ASSESSMENT OF THE INVASIVE BLOODY RED SHRIMP (HEMIMYSIS ANOMALA) IN CANADA

SCIENCE ADVICE FROM THE RISK ASSESSMENT OF THE INVASIVE BLOODY RED SHRIMP (HEMIMYSIS ANOMALA) IN CANADA Canadian Science Advisory Secretariat Science Advisory Report 2009/078 SCIENCE ADVICE FROM THE RISK ASSESSMENT OF THE INVASIVE BLOODY RED SHRIMP (HEMIMYSIS ANOMALA) IN CANADA Photo credit: Kelly Bowen,

More information

DRAFT MAFMC Assessment Levels - Summary

DRAFT MAFMC Assessment Levels - Summary Mid-Atlantic Fishery Management Council 800 North State Street, Suite 201, Dover, DE 19901-3910 Phone: 302-674-2331 ǀ FAX: 302-674-5399 ǀ www.mafmc.org Richard B. Robins, Jr., Chairman ǀ Lee G. Anderson,

More information

Sea bass (Dicentrarchus labrax) in Divisions VIIIa,b (Bay of Biscay North and Central)

Sea bass (Dicentrarchus labrax) in Divisions VIIIa,b (Bay of Biscay North and Central) ICES Advice on fishing opportunities, catch, and effort Bay of Biscay and the Iberian Coast Ecoregion Published 30 June 2015 Version 2, 25 August 2015 7.3.28 Sea bass (Dicentrarchus labrax) in Divisions

More information

How do populations evolve?... Are there any trends?...

How do populations evolve?... Are there any trends?... How do populations evolve?... Are there any trends?... Gene pool: all of the genes of a population Allele frequency: the percentage of any particular allele in a gene pool A population in which an allele

More information

Ecosystems and Food Webs

Ecosystems and Food Webs Ecosystems and Food Webs How do AIS affect our lakes? Background Information All things on the planet both living and nonliving interact. An Ecosystem is defined as the set of elements, living and nonliving,

More information

Shark, Skate and Ray Conservation Plan

Shark, Skate and Ray Conservation Plan Shark, Skate and Ray Conservation Plan Introduction Sharks, skates and rays, collectively known as elasmobranchs are caught in fisheries worldwide, including in EU and UK waters. Many have been depleted

More information

NOAA Fisheries Draft Protocol for Prioritizing Fish Stock Assessments. Prioritizing Fish Stock Assessments. NOAA Fisheries.

NOAA Fisheries Draft Protocol for Prioritizing Fish Stock Assessments. Prioritizing Fish Stock Assessments. NOAA Fisheries. Prioritizing Fish Stock Assessments NOAA Fisheries February 2014 TABLE OF CONTENTS Executive Summary... 3 Background... 6 Situation... 6 Need For Prioritization... 8 Scope: Stocks and Regional Scale...

More information

Maintenance of Diversity topics

Maintenance of Diversity topics Maintenance of Diversity topics Succession Loss of diversity competitive exclusion Maintenance of Diversity Resources unlimited Competition diminished Predation Generalist predation Keystone predation

More information

Measurement Error Affects Risk Estimates for Recruitment to the Hudson River Stock of Striped Bass

Measurement Error Affects Risk Estimates for Recruitment to the Hudson River Stock of Striped Bass Research Article Defining and Assessing Adverse Environmental Impact Symposium 2001 TheScientificWorldJOURNAL (2002) 2(S1), 238 253 ISSN 1537-744X; DOI 10.1100/tsw.2002.865 Measurement Error Affects Risk

More information

WATER HARVESTING AND AQUACULTURE FOR RURAL DEVELOPMENT INTRODUCTION TO TILAPIA CULTURE

WATER HARVESTING AND AQUACULTURE FOR RURAL DEVELOPMENT INTRODUCTION TO TILAPIA CULTURE WATER HARVESTING AND AQUACULTURE FOR RURAL DEVELOPMENT INTRODUCTION TO TILAPIA CULTURE 2 INTERNATIONAL CENTER FOR AQUACULTURE AND AQUATIC ENVIRONMENTS AUBURN UNIVERSITY 3 INTRODUCTION Tilapia are native

More information

Working to Conserve Key Species: EWS-WWF s Marine Turtle Conservation Project. Envirocities emagazine

Working to Conserve Key Species: EWS-WWF s Marine Turtle Conservation Project. Envirocities emagazine 42 Working to Conserve Key Species: EWS-WWF s Marine Turtle Conservation Project Envirocities emagazine 43 Issue 6, Sep 2013 Emirates Wildlife Society - WWF Dubai United Arab Emirates Marine turtles are

More information

RECRUITMENT DYNAMICS OF GREAT LAKES SEA LAMPREY (PETROMYZON MARINUS) POPULATIONS AND IMPLICATIONS FOR INTEGRATED PEST MANAGEMENT HEATHER A.

RECRUITMENT DYNAMICS OF GREAT LAKES SEA LAMPREY (PETROMYZON MARINUS) POPULATIONS AND IMPLICATIONS FOR INTEGRATED PEST MANAGEMENT HEATHER A. RECRUITMENT DYNAMICS OF GREAT LAKES SEA LAMPREY (PETROMYZON MARINUS) POPULATIONS AND IMPLICATIONS FOR INTEGRATED PEST MANAGEMENT BY HEATHER A. DAWSON A DISSERTATION Submitted to Michigan State University

More information

13. Steps 3.1 & 3.2. Develop objectives, indicators and benchmarks. Essential EAFM Date Place. Version 1

13. Steps 3.1 & 3.2. Develop objectives, indicators and benchmarks. Essential EAFM Date Place. Version 1 13. Steps 3.1 & 3.2 Develop objectives, indicators and benchmarks Essential EAFM Date Place Version 1 Session objectives After this session you will be able to: Develop management objectives Develop indicators

More information

Ecological Methodology Second Edition

Ecological Methodology Second Edition Ecological Methodology Second Edition Charles J. Krebs University of British Columbia Technische Universitat Darmstadt FACHBEREICH 10 BIOLOGIE Bi bliothek SchnittspahnstraBe 10 D-64 28 7 Darmstadt Inv.-Nr.

More information

9.3.8 Blue whiting (Micromesistius poutassou) in Subareas I IX, XII, and XIV (Northeast Atlantic) ICES stock advice

9.3.8 Blue whiting (Micromesistius poutassou) in Subareas I IX, XII, and XIV (Northeast Atlantic) ICES stock advice ICES Advice on fishing opportunities, catch, and effort Northeast Atlantic Ecoregion Published 30 September 2015 Version 2, 9 December 2015 9.3.8 Blue whiting (Micromesistius poutassou) in Subareas I IX,

More information

PIRSA Fisheries & Aquaculture Charter Fishery Compliance Plan 2014-2015

PIRSA Fisheries & Aquaculture Charter Fishery Compliance Plan 2014-2015 Fishery Management Plan Goals: 1. Charter Boat Fishery resources harvested within ecologically sustainable limits 2. Optimum utilisation and equitable distribution of the Charter Boat Fishery resources

More information

Should I Buy an Income Annuity?

Should I Buy an Income Annuity? The purchase of any financial product involves a trade off. For example when saving for retirement, you are often faced with making a trade off between how much you want to protect your investments from

More information

Lesson 3: Fish Life Cycle

Lesson 3: Fish Life Cycle Lesson 3: Fish Life Cycle Activity: Diagram fish life cycle. Grade level: 4-8 Subjects: Science, social studies Setting: Classroom Duration: 50 minutes Key Terms: Fry, life cycle, life history, spawn,

More information

22. Assessment of the Octopus Stock Complex in the Bering Sea and Aleutian Islands

22. Assessment of the Octopus Stock Complex in the Bering Sea and Aleutian Islands 22. Assessment of the Octopus Stock Complex in the Bering Sea and Aleutian Islands M. Elizabeth Conners, Christina Conrath, and Kerim Aydin Alaska Fisheries Science Center November 2015 Executive Summary

More information

1.2 Advice basis May 2014

1.2 Advice basis May 2014 1.2 Advice basis May 2014 1.2.1 General context of ICES advice ICES advises competent authorities on marine policy and management issues related to the impacts of human activities on marine ecosystems

More information

SEA OTTER HISTORY peninsula abundant coerced extinct remnant International Fur Seal Treaty CALIFORNIA threatened Endangered Species Act degradation

SEA OTTER HISTORY peninsula abundant coerced extinct remnant International Fur Seal Treaty CALIFORNIA threatened Endangered Species Act degradation SEA OTTER HISTORY Sea otters once ranged from northern Japan to the Alaskan peninsula and along the west coast of North America to Baja California in Mexico. Until the 1700s, sea otters were abundant throughout

More information

SARC 52 SUMMARY REPORT

SARC 52 SUMMARY REPORT 52th Northeast Regional Stock Assessment Review Committee 6 10 June 2011 Northeast Fisheries Science Center Wood s Hole, MA SARC 52 SUMMARY REPORT 6 July 2011 Review Committee Patrick J. Sullivan (chair)

More information

John Holmes Chair, ISC-Albacore Working Group Fisheries and Oceans Canada Nanaimo, BC, Canada

John Holmes Chair, ISC-Albacore Working Group Fisheries and Oceans Canada Nanaimo, BC, Canada John Holmes Chair, ISC-Albacore Working Group Fisheries and Oceans Canada Nanaimo, BC, Canada (MOW4) Harvest Strategy Workshop 30 November 1 December 2015 Kuta, Bali, Indonesia ** Much of this material

More information

Skjal 2. The Faroe Plateau Ecosystem. ICES 2016

Skjal 2. The Faroe Plateau Ecosystem. ICES 2016 Skjal 2. The Faroe Plateau Ecosystem. ICES 2016 ICES Advice on fishing opportunities, catch, and effort Faroes Ecoregion Published 10 June 2016 4.3.1 Cod (Gadus morhua) in Subdivision 5.b.1 (Faroe Plateau)

More information

2016 Outlook and Management -Pre-season outlook / expectations and early indications - General overview of in-season management approach

2016 Outlook and Management -Pre-season outlook / expectations and early indications - General overview of in-season management approach Salmon Briefing 2016 Outlook and Management -Pre-season outlook / expectations and early indications - General overview of in-season management approach Pacific Salmon Species Size and age at return varies

More information

Atlantic States Marine Fisheries Commission

Atlantic States Marine Fisheries Commission Atlantic States Marine Fisheries Commission American Lobster Benchmark Stock Assessment and Peer Review Report Accepted for Management Use August 2015 Vision: Sustainably Managing Atlantic Coastal Fisheries

More information

Enrollment Projections. New York City Public Schools to Volume I

Enrollment Projections. New York City Public Schools to Volume I Enrollment Projections for the New York City Public Schools 2015-16 to 2024-25 Volume I Prepared for the New York City School Construction Authority May 2015 2 Table of Contents Page PK-12 Enrollments

More information

Using the probabilistic MCB runs to set management parameters and determine stock status

Using the probabilistic MCB runs to set management parameters and determine stock status Using the probabilistic MCB runs to set management parameters and determine stock status The existence of uncertainty is a well-accepted and thoroughly documented part of the stock assessment process in

More information

Why Count Birds? (cont.)

Why Count Birds? (cont.) AVIAN CENSUS TECHNIQUES: Why count birds? Descriptive Studies = asks what types of birds occur in a particular habitat? - Provides gross overview of bird occurrence and perhaps a crude estimate of abundance

More information

Ecology Module B, Anchor 4

Ecology Module B, Anchor 4 Ecology Module B, Anchor 4 Key Concepts: - The biological influences on organisms are called biotic factors. The physical components of an ecosystem are called abiotic factors. - Primary producers are

More information

A Guide to Fisheries Stock Assessment using the FMSP Tools

A Guide to Fisheries Stock Assessment using the FMSP Tools A Guide to Fisheries Stock Assessment using the FMSP Tools Daniel D. Hoggarth, Christopher C. Mees, Catherine O Neill, James Hindson, Mohan Krishna Copyright 2005, Marine Resources Assessment Group (MRAG),

More information

Critical Thinking ANALOGIES. Skills Worksheet

Critical Thinking ANALOGIES. Skills Worksheet Skills Worksheet Critical Thinking ANALOGIES In the space provided, write the letter of the pair of terms or phrases that best complete the analogy shown. An analogy is a relationship between two pairs

More information

3.3.3 Capelin (Mallotus villosus) in Subareas I and II (Northeast Arctic), excluding Division IIa west of 5 W (Barents Sea capelin)

3.3.3 Capelin (Mallotus villosus) in Subareas I and II (Northeast Arctic), excluding Division IIa west of 5 W (Barents Sea capelin) ICES Advice on fishing opportunities, catch, and effort Barents Sea and Norwegian Sea Ecoregions Published 8 October 2015 3.3.3 Capelin (Mallotus villosus) in Subareas I and II (Northeast Arctic), excluding

More information

Acoustic monitoring of Japanese anchovy Engraulis japonicus post larvae shirasu

Acoustic monitoring of Japanese anchovy Engraulis japonicus post larvae shirasu Title Acoustic monitoring of Japanese anchovy Engraulis japonicus post larvae shirasu K. Miyashita,, A. Watanabe, S. Morioka, Y. Ikewaki,, R. Matsukura,, and H. Yasuma Engraulis japonicus Shirasu fishery

More information

DUNGENESS CRAB REPORT

DUNGENESS CRAB REPORT DUNGENESS CRAB REPORT Dungeness crabs range from the eastern Aleutian Islands, Alaska, to perhaps Santa Barbara; however, the species is considered rare south of Point Conception. Temperature apparently

More information

Salmon in the Arctic

Salmon in the Arctic Sustainable Strategies in a Warming Climate: Salmon in the Arctic Jennifer L. Nielsen, US Geological Survey, Alaska Science Center Gregory T. Ruggerone, Natural Resources Consultants, Inc., Seattle, WA

More information

STOCK ASSESSMENT OF SUBDIVISION 3PS COD

STOCK ASSESSMENT OF SUBDIVISION 3PS COD Canadian Science Advisory Secretariat Science Advisory Report 29/8 STOCK ASSESSMENT OF SUBDIVISION 3PS COD 48 Burgeo 47 3Pn 3Psa SPM 3Psb 3Psd 3Pse 3Psc 46 4Vn 3Psg St. Pierre Bank 3Psf Green Bank 3L 45

More information

of invasionn Disease dynamics

of invasionn Disease dynamics Occupancy estimation & modeling Many interesting questions and applied problems in ecology and conservation require data from large spatial scales through a number off years Often it is not possible to

More information

Study suggests the Mediterranean Sea may be losing large predatory sharks.

Study suggests the Mediterranean Sea may be losing large predatory sharks. research series april 2008 Study suggests the Mediterranean may be losing large predatory sharks. SHARK DECLINES IN THE MEDITERRANEAN SEA A Summary of New Scientific Analysis: Ferretti, F., Myers, R.A.,

More information

Population Growth Activity Date Per

Population Growth Activity Date Per Population Growth Activity Name Date Per Objectives: You will graph the population growth of different populations and use it to predict future growth. You will identify factors that affect population

More information

Commercial Electronic Logbook Pilot Project

Commercial Electronic Logbook Pilot Project Commercial Electronic Logbook Pilot Project SEFSC Brett Pierce and Dave Gloeckner Fishery Monitoring Branch Southeast Fisheries Science Center September 16, 2014 Goals and Objectives Goal: Create on-board

More information

Chum Salmon recovery in Oregon tributaries to the lower Columbia River. Kris Homel Chum Reintroduction Coordinator

Chum Salmon recovery in Oregon tributaries to the lower Columbia River. Kris Homel Chum Reintroduction Coordinator Chum Salmon recovery in Oregon tributaries to the lower Columbia River Kris Homel Chum Reintroduction Coordinator History of decline Chum have broadest distribution Historic runs in Columbia River estimated

More information

KNOWLEDGE-BASED DECISIONS IN COASTAL ZONE MANAGEMENT

KNOWLEDGE-BASED DECISIONS IN COASTAL ZONE MANAGEMENT KNOWLEDGE-BASED DECISIONS IN COASTAL ZONE MANAGEMENT JAKOB GJØSÆTER Institute of Marine Research, Flødevigen Marine Research Statio, Telephone, +4737059014 jakob.gjoesaeter@imr.no Abstract The coastal

More information

Therefore, this is a very important question, which encourages consideration of the current management of the resource.

Therefore, this is a very important question, which encourages consideration of the current management of the resource. Aalisarnermut, Piniarnermut Nunalerinermullu Naalakkersuisoqarfik Department of Fisheries, Hunting and Agriculture Finn's speech to NAFMC Climate change in the North Atlantic has become a reality which

More information

Interior Fraser River Coho Salmon

Interior Fraser River Coho Salmon . DFO Science Pacific Region Stock Status Report D6-8 (21) Johnstone Strait Vancouver Island N Strait of Georgia Fraser Canyon Interior Fraser River Coho Salmon West Coast Van. Island Juan de Fuca Lower

More information

ALASKA DEPARTMENT OF FISH AND GAME DIVISION OF COMMERCIAL FISHERIES NEWS RELEASE

ALASKA DEPARTMENT OF FISH AND GAME DIVISION OF COMMERCIAL FISHERIES NEWS RELEASE ALASKA DEPARTMENT OF FISH AND GAME DIVISION OF COMMERCIAL FISHERIES NEWS RELEASE Sam Cotten, Commissioner Jeff Regnart, Director Contact: Anchorage Area Office Aaron Poetter, Area Management Biologist

More information

Models Where the Fate of Every Individual is Known

Models Where the Fate of Every Individual is Known Models Where the Fate of Every Individual is Known This class of models is important because they provide a theory for estimation of survival probability and other parameters from radio-tagged animals.

More information

Michigan Department of Natural Resources 2007-28 Status of the Fishery Resource Report Page 1

Michigan Department of Natural Resources 2007-28 Status of the Fishery Resource Report Page 1 Michigan Department of Natural Resources 2007-28 Status of the Fishery Resource Report Page 1 Bodi Lake Luce County, T50N, R08W, S29 Little Two Hearted River Watershed, Last surveyed 2004 James R. Waybrant

More information

Pennsylvania Fish & Boat Commission Biologist Report. Delaware Estuary. Delaware and Philadelphia Counties

Pennsylvania Fish & Boat Commission Biologist Report. Delaware Estuary. Delaware and Philadelphia Counties Delaware Estuary Delaware and Philadelphia Counties 2011 Striped Bass Spawning Stock Assessment The Pennsylvania Fish and Boat Commission assessed the striped bass spawning stock in the tidal Delaware

More information