Term
| What do shredders forage on and where are they found? |
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Definition
- Forage on CPOM (coarse particulate organic matter)
- Found in headwater regions w/ riparian habitat shading the water
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Term
| What do collectors feed on and where are they found? |
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Definition
- Consume FPOM (fine particulate organic matter)
- Dominant in headwaters (with shredders) and midreach (with grazers) and larger river segments (no grazers/shredders present)
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Term
| Where are predatory aquatic insects found? |
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Definition
| Equal distribution in all river sections |
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Term
| What do grazers eat and where are they found? |
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Definition
- Eat periphyton, benthic algae, and aquatic macrophytes
- Herbivores/carnivores
- Scrape algae off mineral and organic surfaces
- Found in midreach regions
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Term
| Insects evolved on land and moved into headwater streams; spread down to lower, warmer settings, sorted into niches based on _______ rather than __________. |
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Definition
| Temperature rather than competition for food |
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Term
| Aquatic insects that metamorphose into flying forms represent a net (gain/loss) of aquatic productivity. |
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Definition
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Term
| What gives rise to the species diversity of headwater streams? |
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Definition
- Headwater streams
- 100-250 species (mostly shredders)
- Very heterogeneous area => lots of gravel and rocks
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Term
| Which aquatic habitat has the highest species richness? Why? |
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Definition
- Midreach regions
- 200-500 species
- Abundance of periphyton
- Heterogeneous habitat
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Term
| Why do large rivers have low species diversity? |
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Definition
- Homogenous - mud bottom
- More insects are terrestrial than aquatic
- The collectors that dominate are either filter feeders or sediment burrowers
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Term
| About how many species of aquatic insects are there? |
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Definition
30,000
13 orders
only comprises 3% of arthropods |
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Term
| Which has more relative species, Oligotrophic lakes or eutrophic lakes? Why? |
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Definition
- Oligotrophic lakes
- Still relatively low species b/c there is little to consume => lakes at high elevation, no riparian vegetation, no periphyton
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Term
| Which zone of eutrophic lakes do insects and plants live? |
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Definition
| Limnetic zone (top part) or along the edge |
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