Fish Associations and Environmental Variables in Age-0 Colorado Squawfish Habitats, Green River, Utah

Autor:	Harold M. Tyus, G. Bruce Haines
Rok vydání:	1990
Předmět:	Ptychocheilus Colorado squawfish Catostomus biology Speckled dace Ecology Aquatic Science Minnow biology.organism_classification Fishery Red shiner biology.animal Notropis Pimephales promelas Ecology Evolution Behavior and Systematics
Zdroj:	Journal of Freshwater Ecology. 5:427-435
ISSN:	2156-6941 0270-5060
Popis:	Age-0 Colorado squawfish Ptychocheilus lucius were sympatric with seven native and 15 introduced fishes in the Green River, Utah, 1979–88. Larval Colorado squawfish was the most abundant fish captured in summer drift (38%), which included suckers Catostomus spp. (33%), speckled dace Rhinichthys osculus (14%), and channel catfish Ictalurus punctatus (3%). However, ephemeral shoreline embayments (backwaters) used by Colorado squawfish as nursery habitats were dominated by introduced fishes, including red shiner Notropis lutrensis (87%) in summer, and red shiner (65%) and fathead minnow Pimephales promelas (16%) in autumn. Abundance of most fishes was highest in years of lower, more historic summer flows. Most fishes in backwaters inhabited a wide range of environmental conditions, but were most abundant in habitats deeper than 15 cm. We detected no segregation in habitat use between young Colorado squawfish and non-native fishes. Hydrologic conditions in the regulated Green River presumably favor t...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e47fcb58db4e6c21a48b47a8ccc7fc1d https://doi.org/10.1080/02705060.1990.9665259 Zobrazit plný text záznamu