bio155_lecture 10_Fish

bio155_lecture 10_Fish - BIOE 155 Freshwater Ecology Read...

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BIOE 155 Freshwater Ecology Read 121-130 (for more information, I recommend Moyle Inland Fishes of California ) FISHES Fishes are vertebrates. Most diverse group of vertebrates (22,000 species) Freshwaters (41% of fish diversity) Marine (58% of fish diversity) Note that freshwaters are disproportionately high diversity, given that there is much less freshwater habitat compared to marine habitat. Fish are ectothermic —same temperature as their evironment Different feeding types: The jaw morphology of fish can tell you a lot about its feeding habits. Fish have amazing diversity of feeding habits. Parasitic Planktivore Piscivore Detritivore Herbivore Benthivore Omnivore And more!!! Feeding rate One important relationship between fish and their prey (and any predator and its prey), is the relationship between prey density and feeding rate. Function response curves = The rate that an organism feeds will be a function of prey availability. See figure below. There are three classic functional responses: Type 1. Predators continue to feed more and more rapidly as prey abundance increases. Type 2 . Predator feeding rate saturates as prey abundance increases. Biologically, this would be because predators become “swamped”. Type 3. Predator feeding rate is initially low, than increases and saturates. At high prey abundances, predators are swamped. At low prey, the predators are either looking for some other prey (i.e., prey switching), or there are a limited number of prey hiding spots. Prey abundance Prey consumed Type 1 Type 2 Type 3
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BIOE 155 Freshwater Ecology Trophic Ontogeny: The change in feeding habits as an organism grow larger. Many fish change body size dramatically over their life, and concurrently change feeding
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This note was uploaded on 11/06/2009 for the course BIO 155 taught by Professor Moore during the Fall '09 term at UCSC.

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bio155_lecture 10_Fish - BIOE 155 Freshwater Ecology Read...

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