Functional Feeding Groups in Stream Macroinvertebrates Powerpoint to accompany Lesson 6 in the Biodiversity Teaching Experiment Written by: Jennifer Doherty, Cornelia Harris, and Laurel Hartley Culturally relevant ecology, learning progressions and environmental literacy Long Term Ecological Research Math Science Partnership 2012 Disclaimer: This research is supported by a grant from the National Science Foundation: Targeted Partnership: Culturally relevant ecology, learning progressions and environmental literacy (NSF-0832173). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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/ (video for the dobsonfly could not be downloaded, follow link above to see video. It’s worth watching!) Dobsonfly - check out those large jaws!