{"id":919,"date":"2020-05-31T09:57:56","date_gmt":"2020-05-31T08:57:56","guid":{"rendered":"http:\/\/blogs.kent.ac.uk\/seak\/?p=919"},"modified":"2020-11-12T10:01:48","modified_gmt":"2020-11-12T10:01:48","slug":"new-paper-size%e2%80%90-and-stage%e2%80%90dependence-in-cause%e2%80%90specific-mortality-of-migratory-brown-trout","status":"publish","type":"post","link":"https:\/\/blogs.kent.ac.uk\/seak\/2020\/05\/31\/new-paper-size%e2%80%90-and-stage%e2%80%90dependence-in-cause%e2%80%90specific-mortality-of-migratory-brown-trout\/","title":{"rendered":"New Paper: Size\u2010 and stage\u2010dependence in cause\u2010specific mortality of migratory brown trout"},"content":{"rendered":"

The paper\u00a0Size\u2010 and stage\u2010dependence in cause\u2010specific mortality of migratory brown trout<\/a>\u00a0by Chlo\u00e9 R. Nater, Yngvild Vindenes, Per Aass, Diana Cole, \u00d8ystein Langangen, S. Jannicke Moe, Atle Rustadbakken, Daniel Turek, Leif Asbj\u00f8rn V\u00f8llestad and Torbj\u00f8rn Ergon was published in Journal of Animal Ecology.<\/p>\n

Abstract<\/h4>\n
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  1. Evidence\u2010based management of natural populations under strong human influence frequently requires not only estimates of survival but also knowledge about how much mortality is due to anthropogenic vs. natural causes. This is the case particularly when individuals vary in their vulnerability to different causes of mortality due to traits, life history stages, or locations.<\/li>\n
  2. Here, we estimated harvest and background (other cause) mortality of landlocked migratory salmonids over half a century. In doing so, we quantified among\u2010individual variation in vulnerability to cause\u2010specific mortality resulting from differences in body size and spawning location relative to a hydropower dam.<\/li>\n
  3. We constructed a multistate mark\u2013recapture model to estimate harvest and background mortality hazard rates as functions of a discrete state (spawning location) and an individual time\u2010varying covariate (body size). We further accounted for among\u2010year variation in mortality and migratory behaviour and fit the model to a unique 50\u2010year time series of mark\u2013recapture\u2013recovery data on brown trout (Salmo trutta<\/i>) in Norway.<\/li>\n
  4. Harvest mortality was highest for intermediate\u2010sized trout, and outweighed background mortality for most of the observed size range. Background mortality decreased with body size for trout spawning above the dam and increased for those spawning below. All vital rates varied substantially over time, but a trend was evident only in estimates of fishers’ reporting rate, which decreased from over 50% to less than 10% throughout the study period.<\/li>\n
  5. We highlight the importance of body size for cause\u2010specific mortality and demonstrate how this can be estimated using a novel hazard rate parameterization for mark\u2013recapture models. Our approach allows estimating effects of individual traits and environment on cause\u2010specific mortality without confounding, and provides an intuitive way to estimate temporal patterns within and correlation among different mortality sources.<\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    The paper\u00a0Size\u2010 and stage\u2010dependence in cause\u2010specific mortality of migratory brown trout\u00a0by Chlo\u00e9 R. Nater, Yngvild Vindenes, Per Aass, Diana Cole, \u00d8ystein Langangen, S. Jannicke Moe, Atle Rustadbakken, Daniel Turek, Leif Asbj\u00f8rn V\u00f8llestad and Torbj\u00f8rn Ergon was published in Journal of Animal Ecology. Abstract Evidence\u2010based management of natural populations under strong human influence frequently requires not […]<\/p>\n","protected":false},"author":40695,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[597],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/posts\/919"}],"collection":[{"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/users\/40695"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/comments?post=919"}],"version-history":[{"count":1,"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/posts\/919\/revisions"}],"predecessor-version":[{"id":920,"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/posts\/919\/revisions\/920"}],"wp:attachment":[{"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/media?parent=919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/categories?post=919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.kent.ac.uk\/seak\/wp-json\/wp\/v2\/tags?post=919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}