An Investigation of Factors Affecting the Decline of Delta Smelt (Hypomesus transpacificus) in the Sacramento-San Joaquin Estuary
| Autor: | William J. Miller, Bryan F. J. Manly, Dennis D. Murphy, Rob Roy Ramey, David Fullerton |
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| Rok vydání: | 2012 |
| Předmět: |
Abiotic component
Delta education.field_of_study geography geography.geographical_feature_category biology Ecology Population Estuary Management Monitoring Policy and Law Aquatic Science biology.organism_classification Fishery Abundance (ecology) Hypomesus transpacificus San Joaquin Smelt education Ecology Evolution Behavior and Systematics |
| Zdroj: | Reviews in Fisheries Science. 20:1-19 |
| ISSN: | 1547-6553 1064-1262 |
| DOI: | 10.1080/10641262.2011.634930 |
| Popis: | The delta smelt is an annual fish that is endemic to the Sacramento-San Joaquin Estuary and is protected under federal and California Endangered Species Acts. Record low abundances have occurred since 2004. Three questions are addressed here: What is the relative importance of environmental factors with direct effects on abundance? Do factors that may have indirect effects provide an explanation of abundance changes? Are effects of environmental factors better accounted for individually or as criteria defining the volume of water with suitable abiotic attributes? Strong evidence was found of density-dependent population regulation. The density of prey was the most important environmental factor explaining variations in delta smelt abundance from 1972 to 2006 and over the recent period of decline in the abundance of the fish. Predation and water temperature showed possible effects. Entrainment of delta smelt at south Delta pumping plants showed statistically significant effects on adult-to-juvenile surviva... |
| Databáze: | OpenAIRE |
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