期刊论文详细信息
Endangered Species Research | |
Quantifying the effect of Caspian tern predation on threatened and endangered Pacific salmon in the Columbia River estuary | |
Michelle M. McClure1  Thomas P. Good1  Douglas M. Marsh1  Benjamin P. Sandford1  Brad A. Ryan1  Edmundo Casillas1  Katherine A. Barnas1  | |
关键词: Caspian tern; Pacific salmon; Predation; Life-cycle modeling; Lambda (λ); | |
DOI : 10.3354/esr003011 | |
学科分类:动物科学 | |
来源: Inter-Research | |
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【 摘 要 】
ABSTRACT: Caspian terns Sterna caspia breeding in the Columbia River estuary exploit Pacific salmon Oncorhynchus spp. as prey, consuming millions of outmigrating juvenile salmonids annually. We analyzed recoveries of salmonid passive integrated transponder (PIT) tags from the East Sand Island tern colony to calculate predation rates (% of available fish taken) on 4 Columbia and Snake River steelhead O. mykiss Evolutionarily Significant Units (ESUs). A life cycle modeling approach was used to estimate potential increases in ESU population growth rate (λ) given potential reductions in Caspian tern numbers on East Sand Island. Reducing tern predation on steelhead ESUs by 50 100% increased λ from 0.8 to 2.5%, depending on the ESU and the reproductive contribution of hatchery fish, and assuming no compensatory mortality. This is comparable to survival improvements modeled for hydropower improvements in the basin but less than those modeled for harvest reductions. Reducing avian predation as part of an effort to reduce all sources of mortality may assist in ESU recovery. A thorough understanding of such predatorprey relationships is needed to manage conflicts between predators and their threatened and endangered Pacific salmonid prey.【 授权许可】
Unknown
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RO201912080708297ZK.pdf | 536KB | ![]() |