Managed Wetlands Can Benefit Juvenile Chinook Salmon in a Tidal Marsh
Autor: | John R. Durand, Peter B. Moyle, Nann A. Fangue, Nicole M. Aha, Andrew L. Rypel |
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Rok vydání: | 2021 |
Předmět: |
0106 biological sciences
Chinook wind Marsh 010504 meteorology & atmospheric sciences Diked wetlands Wetland Aquatic Science 01 natural sciences Zooplankton Fish nurseries Fitness Ecology Evolution Behavior and Systematics Nursery habitat 0105 earth and related environmental sciences Habitat management geography geography.geographical_feature_category Ecology biology 010604 marine biology & hydrobiology Estuary Tidal flow Biological Sciences biology.organism_classification Marine Biology & Hydrobiology Fishery Salt marsh Restoration Earth Sciences Oncorhynchus Environmental science Environmental Sciences |
Zdroj: | Estuaries and Coasts, vol 44, iss 5 |
Popis: | Loss of estuarine and coastal habitats worldwide has reduced nursery habitat and function for diverse fishes, including juvenile Chinook salmon (Oncorhynchus tshawytscha). Underutilized off-channel habitats such as flooded rice fields and managed ponds present opportunities for improving rearing conditions and increasing habitat diversity along migratory corridors. While experiments in rice fields have shown enhanced growth rates of juvenile fishes, managed ponds are less studied. To evaluate the potential of these ponds as a nursery habitat, juvenile Chinook salmon (~ 2.8 g, 63 mm FL) were reared in cages in four contrasting locations within Suisun Marsh, a large wetland in the San Francisco Estuary. The locations included a natural tidal slough, a leveed tidal slough, and the inlet and outlet of a tidally muted managed pond established for waterfowl hunting. Fish growth rates differed significantly among locations, with the fastest growth occurring near the outlet in the managed pond. High zooplankton biomass at the managed pond outlet was the best correlate of salmon growth. Water temperatures in the managed pond were also cooler and less variable compared to sloughs, reducing thermal stress. The stress of low dissolved oxygen concentrations within the managed pond was likely mediated by high concentrations of zooplankton and favorable temperatures. Our findings suggest that muted tidal habitats in the San Francisco Estuary and elsewhere could be managed to promote growth and survival of juvenile salmon and other native fishes. |
Databáze: | OpenAIRE |
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