Bug flows: Don’t count your midges until they hatch

Boatman’s Quarterly Review
By: , and 



Usually when people hear about a “bug problem” it’s due to an undesirable overabundance of insects (think plague of locusts). In the Colorado River in Grand Canyon, however, we are faced with the opposite predicament: the river is essentially devoid of bugs. Aquatic insects are a fundamental component of a healthy river ecosystem. Most aquatic insects spend their juvenile life stages (egg, larva, pupa) in the river and their winged adult life stage flying along the riparian corridor. Throughout these metamorphoses one thing is for certain: aquatic insects are prey for fish, birds, bats, lizards, and even other invertebrates. In Grand Canyon, food web studies conducted by the US Geological Survey (USGS) have demonstrated that populations of both native and sport fish are food limited (Cross et al. 2013, Kennedy et al. 2013). In other words, fish in Grand Canyon are consistently facing a calorie deficit. Indeed, the US Fish and Wildlife Service has cited the inadequate and unreliable food supply as the single greatest problem facing endangered Humpback Chub populations in the Grand Canyon (USFWS 2019).
Publication type Article
Publication Subtype Journal Article
Title Bug flows: Don’t count your midges until they hatch
Series title Boatman’s Quarterly Review
Volume 32
Issue 4
Year Published 2020
Language English
Publisher Grand Canyon River Guides Association
Contributing office(s) Southwest Biological Science Center
Description 4 p.
First page 8
Last page 11
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