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Published on: October 20, 2019
Leaf litter quality affects aquatic insect emergence: contrasting patterns from two foundation trees.
Zacchaeus G Compson1, Kenneth J Adams, Joeseph A Edwards
1Merriam-Powell Center for Environmental Research, Department of Biological Sciences, Northern Arizona University, 617 S. Beaver St., P. O. Box 5640, Flagstaff, AZ, 86011-5640, USA, Zacchaeus.Compson@nau.edu.
Oecologia
|March 28, 2013
Summary
Leaf litter from riparian trees influences aquatic insect emergence. Slow-decomposing leaves generally supported more insects, challenging simple decomposition assumptions and highlighting seasonal differences in leaf quality impacts.
Area of Science:
- Ecology
- Riparian Ecology
- Aquatic Entomology
Background:
- Terrestrial leaf litter is a crucial energy source for aquatic invertebrates.
- Emerging aquatic insects provide vital resources for terrestrial ecosystems.
- Riparian streams in the southwestern US often receive litter from Fremont (Populus fremontii) and narrowleaf (Populus angustifolia) cottonwood trees.
Purpose of the Study:
- To investigate how seasonal changes in leaf litter from two dominant cottonwood species affect aquatic insect emergence.
- To determine if leaf decomposition rate and phytochemical content influence insect emergence patterns.
- To test the hypothesis that fast-decomposing litter with lower phytochemicals supports greater insect emergence.
Main Methods:
- Experimental manipulation of Fremont and narrowleaf cottonwood leaf litter in leaf enclosures.
- Attachment of emergence traps to leaf enclosures to capture emerging aquatic insects.
- Seasonal sampling to quantify insect abundance, biomass, diversity, and functional feeding groups.
Main Results:
- Contrary to predictions, slow-decomposing narrowleaf litter supported more emergent insects than fast-decomposing Fremont litter.
- Insect abundance was higher on narrowleaf litter in spring but similar in fall, indicating seasonal and species-specific effects.
- Functional feeding groups and insect diversity varied seasonally and by leaf type, with Fremont litter supporting higher diversity in spring.
Conclusions:
- Leaf litter quality, not just decomposition rate, significantly influences aquatic insect emergence patterns.
- Aquatic insects utilize different leaf litter types for distinct ecological benefits, including habitat and nutrient availability.
- These findings challenge simplistic models of leaf litter subsidies and underscore the complex interactions between riparian trees and aquatic ecosystems.
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