bio155_lecture_9_Macroinverts - BIOE 155 Freshwater Ecology...

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BIOE 155 Freshwater Ecology Larger Invertebrates (read 107-113) BACKGROUND Allochthonous—energy produced outside of ecosystem (e.g., leaf litter fall). Autochthonous—energy produced within the ecosystem (e.g., phytoplankton, periphyton). Functional feeding groups Different taxa perform different functions in aquatic systems. They form an important component of the food web. For example, shredders break down leaves that fall into streams while scrapers use primary production. Different streams will have different balances of these functional feeding groups, which can indicate the primary source of energy to the system. Functional groups include: Scrapers—scrape off algae (many mayflies) Shredders—shred organic matter like leaves (many caddisflies) Collectors/filterers—collect fine organic particles (many diperans) Predators—eat other invertebrates (such as dragonflies) LARGER INVERTEBRATES There is a long history in stream ecology of studying benthic invertebrates. Benthic invertebrates are to streams what zooplankton are to lakes. Types of larger invertebrates in lakes and streams. MALACOSTRACAN Includes: ± Crayfish—omnivorous (generalist) feeding habits. ± Shrimp (e.g., Neomysis )—can be zooplanktivorous, as observed in the Lake Washington example. ± Amphipods and Isopods—omnivorous. These crustaceans can be important to food webs of both streams and lakes. In the U.S., they are important native and invasive species (e.g., crayfish). They can be both pelagic
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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 University of California, Santa Cruz.

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bio155_lecture_9_Macroinverts - BIOE 155 Freshwater Ecology...

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