Application of ecological models in entomology: a view from Brazil
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1 Application of ecological models in entomology: a view from Brazil Wesley A. C. Godoy University of São Paulo "Luiz de Queiroz" College of Agriculture Piracicaba, São Paulo, Brazil - wacgodoy@usp.br
2 Working with ecological models in different places and areas Medical and forensic entomology Agricultural and forest entomology Universidade Estadual Paulista University of São Paulo - ESALQ Luiz de Queiroz College of Agriculture
3 Overview Part I: blowflies as a study model to investigate intra and interspecific interactions Population dynamics: a scenario involving exotic and native blowfly species Population dynamics applied to forensic entomology Intraguild predation Tri-trophic interactions Part II: combining population theory with biological control and integrated pest management (IPM) Ecological basis for modelling pests and natural enemies Concept of economic injury level A preliminary model combining host-parasitoid theory and IPM Inserting spatial dimension into the system Experiments focused on potential natural enemies for mass production
4 Population dynamics: a scenario involving exotic and native blowfly species
5 Importance of blowflies Vector of diseases Larval therapy Myiasis Forensic entomology
6 and finally, as an experimental model to study population dynamics in laboratory
7 Life cycle of blowflies Carrion
8 Modelling biology and ecology of flies N t F( N t ) S( N t ) N t Fecundity Survival Prout & McChesney, 1985
9 Density dependence N t F( N t ) S( N t ) N t F * f N t * s Nt e S e F* S* f s N(t) N(t)
10 Population size Population size Different values for fecundity and survival produce different dynamics Exotic blowfly species Native blowfly species Generations Generations
11 Part I: blowflies as a study model to investigate intra and interspecific interactions Population dynamics: a scenario involving exotic and native blowfly species Population dynamics applied to forensic entomology Intraguild predation Tri-trophic interactions Part II: combining population theory with biological control and integrated pest management (IPM) Ecological basis for modelling pests and natural enemies Concept of economic injury level A preliminary model combining host-parasitoid theory and IPM Inserting spatial dimension into the system Experiments focused on potential natural enemies for mass production
12 Forensic applications
13 How can ecological models provide useful information for forensic sciences? Showing what factors govern diversity and abundance of insects
14 Three important ecological factors: Diversity and abundance of blowflies Interspecific and trophic interactions Psychoactive drugs or medicines and population dynamics of blowflies Diversity and abundance influence strength of interactions demographic parameters depend on resources available and influence dynamic behaviours Influence of drugs on demographic parameters
15 Comparing demographic parameters influenced by drugs with the Prout & McChesney model N 1 t 1 F( Nt ) S( Nt ) N 2 t F S * * e e f N t s N t 1. Amphetamine (stimulant drug) 2. Phenobarbital (anticonvulsant, sedative and hypnotic) 3. Methanol (organic solvent) 4. Oxycodone (analgesic)
16 Table 1. Exponential regression analysis of fecundity and survival for the control, phenobarbital, methanol and amphetamine treatments Control Phenobarbital Methanol Amphetamine F S F S F S F S Y intercepts RC r ANOVA P < 0.001; F = fecundity; S = survival; RC= Regression coefficient
17 Fecundity and survival influenced or not by drugs in C. albiceps Control Phenobarbital Fecundity Survival
18 Fecundity and survival influenced or not by drugs in C. albiceps Methanol Amphetamine Fecundity Survival
19 Table 1. Exponential regression analysis of fecundity and survival for the control, phenobarbital, methanol and amphetamine treatments Control Phenobarbital Methanol Amphetamine F S F S F S F S Without prey Y intercepts RC r ANOVA P < 0.001; F = fecundity; S = survival; RC= Regression coefficient Table 2. Exponential regression analysis of fecundity and survival in oxycodone, phenobarbital, methanol and amphetamine treatments with the addition of C. megacephala prey Oxycodone Methanol Amphetamine With prey F S F S F S Y intercepts RC r ANOVA P < 0.001; F = fecundity; S = survival; RC= Regression coefficient
20 Fecundity and survival influenced or not by prey consumption Without prey With prey Fecundity Survival
21 Table 3. Percentage of predation of C. albiceps on C. megacephala without choice of prey Predation rate on C. megacephala Time Control Phenobarbital Oxycodone Amphetamine Methanol Total
22 Part I: blowflies as a study model to investigate intra and interspecific interactions Population dynamics: a scenario involving exotic and native blowfly species Population dynamics applied to forensic entomology Intraguild predation Tri-trophic interactions Part II: combining population theory with biological control and integrated pest management (IPM) Ecological basis for modelling pests and natural enemies Concept of economic injury level A preliminary model combining host-parasitoid theory and IPM Inserting spatial dimension into the system Experiments focused on potential natural enemies for mass production
23 Intraguild predation Predator Prey
24 Intraguild predation equations
25
26 Satiation intensity
27 Attack intensity
28 Part I: blowflies as a study model to investigate intra and interspecific interactions Population dynamics: a scenario involving exotic and native blowfly species Population dynamics applied to forensic entomology Intraguild predation Tri-trophic interactions Part II: combining population theory with biological control and integrated pest management (IPM) Ecological basis for modelling pests and natural enemies Concept of economic injury level A preliminary model combining host-parasitoid theory and IPM Inserting spatial dimension into the system Experiments focused on potential natural enemies for mass production
29 Tri trophic interactions investigated IGP: Intraguild predation
30 Interactions investigated with experiments IG-prey survival in absence of IG predator IG-prey survival in presence of IG predator IG-predator survival in absence of IG prey IG-predator survival in presence of IG prey IG - Intraguild
31 IG prey alone IG predator alone IG predator and prey IG prey and parasitoid IG predator and parasitoid IG predator, prey and parasitoid
32 Nomenclature for the ecological model n e = time from oviposition to hatching = 1 day n l1 = development time for 1st and 2nd larval instars n l2 = development time for o 3rd Instar n l = n l1 + n l2 = 4 days n p = pupal time = 4 days n a = adult time = 7 days Species: Chrysomya megacephala (PREY): 1 Chrysomya albiceps (PREDATOR): 2 Nasonia vitripennis (PARASITOID): W
33 Functions for the model IGP by L 2 n on L 1 n Cannibalism on L 2n, IGP ( ), cannibalism ( ) and parasitism ( ) f 1 and f 2 with values between 1 and 0.5
34 Parasitism Number of pupae parasitized = Maximum number of pupae parasitized for 1 day
35 Model description Age of fly E, L,P ou A Species Egg Larva Pupa Natural mortality IGP and cannibalism Adult 3rd Instar: beginning of Beginning of simulation 1st day Following day interactons between flies Pupae
36 Parasitism Natural mortality Natural mortality Interactions with parasitoids Surviving pupae reaches adult phase Oviposition by flies New life cycle
37 Parasitoid equation k = cycle length h = sex ratio (eggs) q = eggs per day Natural mortality Days since the beginning of the experiment
38 Density of blowfly species long to generation Prey + 1 parasitoid Prey + 10 parasitoids Initial population Size = 300 Initial population Size = 100 Predator + 1 parasitoid Predator + 10 parasitoids Gray bars = larvae and pupae of blowflies, White bars = dead individuals, Black lines = parasitoids
39 Only IG prey and predator Prey: bars Predator: black line high IGP and low cannibalism high IGP and high cannibalism low IGP and low cannibalism low IGP and high cannibalism
40 Prey Predator IG prey, predator and parasitoids high IGP and low cannibalism high IGP and high cannibalism parasitoid low IGP and low cannibalism low IGP and high cannibalism parasitoid
41 Part I: blowflies as a study model to investigate intra and interspecific interactions Population dynamics: a scenario involving exotic and native blowfly species Population dynamics applied to forensic entomology Intraguild predation Tri-trophic interactions Part II: combining population theory with biological control and integrated pest management (IPM) Ecological basis for modelling pests and natural enemies Concept of economic injury level A preliminary model combining host-parasitoid theory and IPM Inserting spatial dimension into the system Experiments focused on potential natural enemies for mass production
42 Starting from a host parasitoid model with functional response type II densityindependent survival of parasitoid propagules at generation t
43 If N(t+1) < threshold (L) If N(t+1) threshold (L) q1 = reduction of host population by other methods q2 = parasitoid release rate = number of released parasitoids L = economic threshold Tang & Cheke, 2008
44 Introducing integrated pest management (IPM) strategies into the model
45 30 Population dynamics without IPM strategies N,P H P Population dynamics taking into account IPM strategies 25 L = 15 N,P H P Tempo
46 Now including migration by using coupled lattice model Diffusion type I Host Density independent Diffusion type II Host Density dependent H < Economic threshold: white; H Economy threshold: gray; H Injury level: black
47 without IPM and migration with IPM with IPM and migration
48 Part I: blowflies as a study model to investigate intra and interspecific interactions Population dynamics: a scenario involving exotic and native blowfly species Population dynamics applied to forensic entomology Intraguild predation Tri-trophic interactions Part II: combining population theory with biological control and integrated pest management (IPM) Ecological basis for modelling pests and natural enemies Concept of economic injury level A preliminary model combining host-parasitoid theory and IPM Inserting spatial dimension into the system Experiments focused on potential natural enemies for mass production
49 Relationships between pest and potential predators
50 Experiments to compare the best diet for natural enemies
51 Experiments focused on potential natural enemies for mass production M =
52 Population dynamics of Podisus nigrispinus structured in life stages maintained in artificial diet N Life cycle stages
53 Population dynamics of P. nigrispinus structured in life stages maintained in Drosophila melanogaster N Life cycle stages
54 Population dynamics of P. nigrispinus structured in life stages maintained in Chrysomya putoria N Life cycle stages
55 Current projects by graduate students Fennel and cotton with colored fibers intercropping, pest and natural enemies (Master thesis) Trophic interactions between Spodoptera frugiperda (corn caterpillar) and natural enemies (Master thesis) Trophic interactions between soybean bug and their parasitoids (phd thesis) Intraguild predation in Diaphorina citri and their natural enemies: citrus and sorghum intercropping (phd thesis) Population dynamics of forest pest and natural enemies (phd thesis) Trophic interactions between predator stink bugs and crop pests (phd thesis) Functional response and predator prey dynamics in coccinelids and aphids (posdoc)
56 Thank you
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