Ecology PS 12 PS 13:
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1 Ecology PS 12: Matter cycles and energy flows through living and nonliving components in ecosystems. The transfer of matter and energy is important for maintaining the health and sustainability of ecosystems. PS 13: Population growth is limited by the availability of matter and energy found in resources, the size of the environment, and the presence of competing and/or predatory organisms.
2 What is ecology? Ecology- the scientific study of interactions between organisms and their environments, focusing on energy transfer It is a science of relationships.
3 What do you mean by environment? The environment is made up of two factors: Biotic factors- all living organisms inhabiting the Earth Abiotic factors- nonliving parts of the environment (i.e. temperature, soil, light, moisture, air currents)
4 Biosphere Ecosystem Community Population Organism
5 Organism- any unicellular or multicellular form exhibiting all of the characteristics of life, an individual. The lowest level of organization
6 Population-a group of organisms of one species living in the same place at the same time that interbreed and compete with each other for resources (ex. food, mates, shelter)
7 Community- several interacting populations that inhabit a common environment and are interdependent.
8 Ecosystem- populations in a community and the abiotic factors with which they interact (ex. marine, terrestrial)
9 Biosphere- life supporting portions of Earth composed of air, land, fresh water, and salt water. The highest level of organization
10 The ecological niche of an organism depends not only on where it lives but also on what it does. By analogy, it may be said that the habitat is the organism's address, and the niche is its profession, biologically speaking. Odum - Fundamentals of Ecology
11 Habitat vs. Niche Niche - the role a species plays in a community (job) Habitat- the place in which an organism lives out its life (address)
12 Habitat vs. Niche A niche is determined by the tolerance limitations of an organism, or a limiting factor. Limiting factor- any biotic or abiotic factor that restricts the survival of organisms in a specific environment.
13 Habitat vs. Niche Examples of limiting factors- Amount of water Amount of food Temperature
14 Feeding Relationships There are 3 main types of feeding relationships 1. Producer- Consumer 2. Predator- Prey 3. Parasite- Host
15 Feeding Relationships Producer- all autotrophs (plants), they trap energy from the sun Bottom of the food chain
16 Feeding Relationships Consumer- all heterotrophs: they ingest food containing the sun s energy Herbivores- only eat plants Carnivores- consume animals Omnivores- eat both plants/animals Decomposers- break down waste and dead organisms
17 Feeding Relationships Consumer- Herbivores Eat plants Primary consumers Prey animals
18 Feeding Relationships Consumer-Carnivores-eat meat Predators Hunt prey animals for food.
19 Feeding Relationships Consumer- Carnivores- eat meat Scavengers Feed on carrion, dead animals
20 Feeding Relationships Consumer- Omnivores -eat both plants and animals
21 Feeding Relationships Consumer- Decomposers Breakdown the complex compounds of dead and decaying plants and animals into simpler molecules that can be absorbed
22 Symbiotic Relationships Symbiosis- two species living together 3 Types of symbiosis: 1. Commensalism 2. Parasitism 3. Mutualism
23 Commensalism- Symbiotic Relationships one species benefits and the other is neither harmed nor helped Ex. orchids on a tree Epiphytes: A plant, such as a tropical orchid or a bromeliad, that grows on another plant upon which it depends for mechanical support but not for nutrients. Also called aerophyte, air plant.
24 Commensalism- Symbiotic Relationships one species benefits and the other is neither harmed nor helped Ex. polar bears and cyanobacteria
25 Parasitism- Symbiotic Relationships one species benefits (parasite) and the other is harmed (host) Parasite-Host relationship
26 Symbiotic Relationships Parasitism- parasite-host Ex. lampreys, leeches, fleas, ticks,tapeworm
27 Mutualism- Symbiotic Relationships beneficial to both species Ex. cleaning birds and cleaner shrimp
28 Symbiotic Relationships Mutualismbeneficial to both species Ex. lichen
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30 Type of relationship Species harmed Species benefits Species neutral Commensalism Parasitism Mutualism = 1 species
31 Trophic Levels Each link in a food chain is known as a trophic level. Trophic levels represent a feeding step in the transfer of energy and matter in an ecosystem.
32 Trophic Levels Biomass- the amount of organic matter comprising a group of organisms in a habitat. As you move up a food chain, both available energy and biomass decrease. Energy is transferred upwards but is diminished with each transfer.
33 E N E R G Y Trophic Levels Tertiary consumers- top carnivores Secondary consumerssmall carnivores Primary consumers- Herbivores Producers- Autotrophs
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36 Trophic Levels Food chain- simple model that shows how matter and energy move through an ecosystem
37 What might a food chain in Washington State look like
38 Trophic Levels Food web- shows all possible feeding relationships in a community at each trophic level Represents a network of interconnected food chains
39 Food chain (just 1 path of energy) Food web (all possible energy paths)
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44 Nutrient Cycles Cycling maintains homeostasis (balance) in the environment. 3 cycles to investigate: 1. Water cycle 2. Carbon cycle 3. Nitrogen cycle
45 Water cycle- Evaporation, transpiration, condensation, precipitation
46 Water cycle-
47 Carbon cycle- Photosynthesis and respiration cycle carbon and oxygen through the environment.
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49 Carbon cycle-
50 Nitrogen cycle- Atmospheric nitrogen (N 2 ) makes up nearly 78%-80% of air. Organisms can not use it in that form. Lightning and bacteria convert nitrogen into usable forms.
51 Nitrogen cycle- Only certain bacteria and industrial technologies can fix (convert) nitrogen. Nitrogen fixation-convert atmospheric nitrogen (N 2 ) into ammonium (NH 4+ ) which can be used to make organic compounds like amino acids. N 2 NH + 4
52 Nitrogen cycle- Nitrogen-fixing bacteria: Some live in a symbiotic relationship with plants of the legume family (e.g., soybeans, clover, peanuts).
53 Nitrogen cycle- Some nitrogen-fixing bacteria live free in the soil. Nitrogen-fixing cyanobacteria are essential to maintaining the fertility of semi-aquatic environments like rice paddies.
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55 Lightning Nitrogen fixing bacteria Decomposers Atmospheric nitrogen Animals Nitrogen Cycle Denitrification by bacteria Plants Ammonium Nitrification by bacteria Nitrites Nitrates
56 Toxins in food chains- While energy decreases as it moves up the food chain, toxins increase in potency. This is called biological magnification Ex: DDT & Bald Eagles
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