Difference between revisions of "'''Oviposition and Egg Desiccation'''"

• Aquatic Foodbase
• USU Buglab
• GCMRC Aquatic Food Base Lab
• The Bugflow Experiment Page

2016

• Kennedy et al. 2016. Flow Management for Hydropower Extirpates Aquatic Insects, Undermining River Food Webs. BioScience
• Macroinvertebrate Oviposition (egg-laying) Habitat Preferences on the Green River below Flaming Gorge Dam
• Novel Hydrologic Regimes Disrupt Insect Life History Strategies: Effects of Hydropeaking on Insect Oviposition
• Controls on the Structure and Function of Tailwater Macroinvertebrate Assemblages, USU progress report November 2016
• Oviposition Habitat Selectivity of Tailwater Macroinvertebrates: A Methodological Approach from the Colorado River Basin
• A life history bottleneck for aquatic insects arising from load following
• How dams can go with the flow: Small changes to water flow regimes from dams can help to restore river ecosystems. By N. LeRoy Poff and John C. Schmidt

• Caddis hatch below Parker Dam. There are several species of EPT below Parker and Davis Dam in spite of daily fluctuations that exceed 6 feet per day.

At least three genera of caddisflies and one genus of mayfly were collected in drift and benthic samples downstream of Davis and Parker Dams. These are species of a net-spinning caddisfly in the family Hydropsychidae (Smicridea), a case-building caddisfly in the family Leptoceridae (Nectopsyche), microcaddisflies in the family Hydroptilidae, and a swimming mayfly in the family Baetidae (Baetis). Hydroptilidae are found in light trap samples downstream of Lees Ferry in Grand Canyon, and are common in Arizona streans and rivers (Blinn and Ruiter, 2009). They are nonetheless very small (as indicated by its common name): at under 5 mm in total length (Merritt and others, 2008), generally smaller even than midge (Chironomidae) larvae, and therefore not a valuable prey item for fish. The genus Smicridea spins silk nets for capturing floating particles or organic matter suspended in the water column. For this reason, its family, in general, is common in tailwaters, where they can achieve great densities (Nakano and Strayer, 2014). In fact, Smicridea specifically is a documented pest species in the Parker Dam tailwater and in the Central Arizona Project canals carrying water to the Phoenix metropolitan area (D. Ruiter, personal communication). Baetis mayflies are one of the more common genera in aquatic ecosystems (Merritt and others, 2008); like midges, they are virtually ubiquitous in freshwater habitats. Relatively less information is currently available about the Nectopsyche caddisflies found in these sites, pending further literature research. (2016 GCMRC trip summary to WAPA)