Size-specific apparent survival rate estimates of white sharks using mark-recapture models
Journal of Applied Ecology
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Abstract
For species that exist at low abundance or are otherwise difficult to study, it is challenging to estimate vital rates such as survival and fecundity and common to assume that survival rates are constant across ages and sexes. Population assessments based on overly simplistic vital rates can lead to erroneous conclusions. We estimated sex and length-based annual apparent survival rates for white sharks (Carcharodon carcharias). We found evidence that annual apparent survival differed over ontogeny in a system with competitive foraging aggregations, from 0.63 (SE = 0.08) for newly recruiting sub-adults to 0.95 (SE = 0.02) for the largest sharks. Our results reveal a potential challenge to ontogenetic recruitment in a long-lived, highly mobile top marine predator, as survival rates for sub-adult white sharks may be lower than previously assumed. Alternatively, younger and competitively inferior individuals may be forced to permanently emigrate from primary foraging sites. This study provides new methodology for estimating apparent survival as a function of diverse covariates by capture-recapture study including when sex assignment is uncertain.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Size-specific apparent survival rate estimates of white sharks using mark-recapture models |
| Series title | Journal of Applied Ecology |
| DOI | 10.1139/cjfas-2018-0142 |
| Volume | 76 |
| Issue | 11 |
| Year Published | 2019 |
| Language | English |
| Publisher | Canadian Science Publishing |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 8 p. |
| First page | 2027 |
| Last page | 2034 |
| Country | United States |
| State | California |
| Other Geospatial | Ano Nuevo Island, SE Farallon Island, Tomales Point |
| Google Analytic Metrics | Metrics page |