1 / 18

Trophic relationships

Trophic relationships. Feeding roles in streams. Aquatic insects categorized:. Food type and how food is obtained Feeding guilds = functional groups. Base of trophic relationship. Productivity from? Microbial loop: Fungi, bacteria Use dissolved organic carbon (DOC)

waite
Télécharger la présentation

Trophic relationships

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Trophic relationships Feeding roles in streams

  2. Aquatic insects categorized: • Food type and how food is obtained • Feeding guilds = functional groups

  3. Base of trophic relationship • Productivity from? • Microbial loop: • Fungi, bacteria • Use dissolved organic carbon (DOC) • Passed to protozoans, etc.

  4. Invertebrate consumers • Food resources: • Periphyton • Macrophytes • Detritus • Animals

  5. Feeding roles • Shredders • Leaves, associated microbiota (CPOM) • Chewing • Trichoptera, Plecoptera, Diptera CPOM = > 1 mm

  6. Feeding Roles • Suspension feeder / filterer-collector • FPOM and microbiota • Sloughed periphyton • Use setae, nets, etc. • Net-spinning Trichoptera, Simuliidae, Ephemeroptera

  7. Feeding Roles • Deposit feeder / collector-gatherer • FPOM and microbiota • Browse, collect on surface, burrow • Ephemeroptera, Chironomidae, Ceratopogonidae FPOM = < 0.5 mm

  8. Feeding Roles • Grazer • Periphyton (mostly diatoms) by scraping • Macrophytes by piercing • Ephemeroptera, Trichoptera, Diptera, Lepidoptera, Coleoptera

  9. Feeding Roles • Predator • Animals • Biting, piercing • Odonata, Megaloptera, Plecoptera, Trichoptera, Diptera, Coleoptera

  10. Terrestrial Stream DOM Leaching CPOM Microbes Shredders FPOM Feces

  11. FPOM consumers • Suspension and deposit feeders • Many adaptations for filtering • Philopotamidae caddisfly spins net

  12. FPOM consumers • Suspension feeder • Black fly larvae = Simulidae

  13. FPOM consumers • Deposit feeder = collector-gatherer • Some in sediments, some forage

  14. Consumers of autotrophs • Grazers, piercers • Graze periphyton • Scraping mouthpart adaptations • Water penny beetle larva Psephenus

  15. Consumers of autotrophs • Another grazer • Mayfly Stenonema • Brush algae, then collect it

  16. Predators • Most engulf prey entire or in pieces; others have piercing mouthparts

  17. Problems with trophic classification • Diet shifts with age and size • Many very young invertebrates feed on fine detritus, then change

More Related