Arid
DOI10.1890/ES13-00100.1
High predation on small populations: avian predation on imperiled salmonids
Osterback, Ann-Marie K.1,2; Frechette, Danielle M.2; Shelton, Andrew O.3; Hayes, Sean A.2; Bond, Morgan H.2; Shaffer, Scott A.4,5; Moore, Jonathan W.1
通讯作者Osterback, Ann-Marie K.
来源期刊ECOSPHERE
ISSN2150-8925
出版年2013
卷号4期号:9
英文摘要

Generalist predators can contribute to extinction risk of imperiled prey populations even through incidental predation. Quantifying predation on small populations is important to manage their recovery, however predation is often challenging to observe directly. Recovery of prey tags at predator colonies can indirectly provide minimum estimates of predation, however overall predation rates often remain unquantifiable because an unknown proportion of tags are deposited off-colony. Here, we estimated overall predation rates on threatened wild juvenile steelhead (Oncorhynchus mykiss) by generalist adult Western Gulls (Larus occidentalis) in six central California (USA) watersheds. We estimated predation rates by gulls from the recapture of PIT (passive integrated transponder) tags that were originally inserted into steelhead and were subsequently deposited at a Western Gull breeding colony, A no Nuevo Island (ANI). We combined three independent datasets to isolate different processes: (1) the probability a tagged steelhead was consumed during predation, (2) the probability a consumed tag was transported to ANI, and (3) the probability a transported tag was detected at ANI. Together, these datasets parameterized a hierarchical Bayesian model to quantify overall predation rates while accounting for tag loss between when prey were tagged and subsequent tag detection at ANI. Results from the model suggest that low recovery rates of PIT tags from steelhead at ANI were mostly driven by low probabilities of transportation (<= 0.167) of consumed tags to ANI. Low transportation probabilities equate to high per-capita probabilities of predation (<= 0.306/ yr) at the three watersheds in closest proximity to ANI, whereas predation rates were uncertain at watersheds farther from ANI due to very low transportation rates. This study provides the first overall estimate of Western Gull predation rates on threatened wild juvenile steelhead and suggests gull predation on salmonids is a larger source of mortality than was previously estimated from minimum predation rates. This study thus represents an important example of high rates of incidental predation by a generalist consumer on an imperiled prey and provides a quantitative framework to inform robust estimates of predation rates on small populations that can be applied to other systems where direct observation of predation is not feasible.


英文关键词Bayesian modeling California USA central-place forager food web incidental predation Larus occidentalis Oncorhynchus mykiss PIT tag steelhead stream Western Gull
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000327379700011
WOS关键词STEELHEAD ONCORHYNCHUS-MYKISS ; CASPIAN TERN PREDATION ; COLUMBIA RIVER ESTUARY ; SAN-FRANCISCO BAY ; JUVENILE SALMONIDS ; CENTRAL CALIFORNIA ; PACIFIC SALMON ; BRISTOL CHANNEL ; MOJAVE DESERT ; COHO SALMON
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/176786
作者单位1.Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA;
2.NOAA, Fisheries Ecol Div, SW Fisheries Sci Ctr, Natl Marine Fisheries Serv, Santa Cruz, CA 95060 USA;
3.Univ Calif Santa Cruz, Ctr Stock Assessment Res, Santa Cruz, CA 95064 USA;
4.San Jose State Univ, Dept Biol Sci, San Jose, CA 95192 USA;
5.Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95060 USA
推荐引用方式
GB/T 7714
Osterback, Ann-Marie K.,Frechette, Danielle M.,Shelton, Andrew O.,et al. High predation on small populations: avian predation on imperiled salmonids[J],2013,4(9).
APA Osterback, Ann-Marie K..,Frechette, Danielle M..,Shelton, Andrew O..,Hayes, Sean A..,Bond, Morgan H..,...&Moore, Jonathan W..(2013).High predation on small populations: avian predation on imperiled salmonids.ECOSPHERE,4(9).
MLA Osterback, Ann-Marie K.,et al."High predation on small populations: avian predation on imperiled salmonids".ECOSPHERE 4.9(2013).
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