Functional Feeding Groups

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Presentation transcript:

Functional Feeding Groups in stream macroinvertebrates Organisms have particular abiotic and biotic habitat/resource requirements. Explain to students that we can classify different organisms by their biotic requirements, like the type of food they eat. You have observed the mouthparts of the macroinvertebrates from your leaf packs, now you will discuss how different shaped mouthparts make different organisms suited to eat different things. Consider asking students to hypothesize how and what they think these groups might eat.

Predator Dragonfly larvae have a modified labium (lower lip) to snap up prey; its really fast, check out the YouTube video by clicking on the picture or pasting http://www.youtube.com/watch?v=PVgJSGivl6o&feature=related into your browser Dragonfly Larvae: lower lip is modified to snap up prey! Watch one hunting!

Predator The video is 2 min 35 sec and shows the mouthparts well; it is GROSS near the end too  watch by clicking on picture or copying http://www.youtube.com/watch?v=RD5wsoycsqI into your browser What do all the predators have in common? Damselfly Larva: watch a video of one catching and eating a small fish

Scraper What you see in the photo is the underside of a snail, with its mouthpart, called a radula, in action scraping food off rocks and stones. Snails are scrapers! Click picture for video of scraping eating or past url into browser http://www.youtube.com/watch?v=UFShUYbj6z8&feature=related

Collector Blackfly Larva The fans on their head circulate water and collect microscopic particles of detritus and microscopic food such as bacteria Blackfly Larva

Collector Mayfly: can you see all their mouthparts

Shredder Crane Fly Larvae Chewing mouthparts also allow shredders to break up leaves into smaller pieces and eat the small (micro) organisms living on them Crane Fly Larvae

Shredder Caddisfly Larva Caddisfly shredder pulling leaf bits into its mouth for feeding click on picture or paste url into browser http://www.youtube.com/watch?v=de3vfjjM3C8&NR=1 Caddisfly Larva

Guess the functional feeding group… Predator? Scraper? Collector? Shredder? Dobsonflies are predators. Video: http://www.flickr.com/photos/sokalo/3621851884/ Dobsonfly - check out those large jaws!