Spatiotemporal variation in size-structured populations using fishery data: an application to shortfin mako (Isurus oxyrinchus) in the Pacific Ocean

Autor:	James T. Thorson, Mark N. Maunder, Mikihiko Kai, Kevin R. Piner
Rok vydání:	2017
Předmět:	0106 biological sciences Fishery Mixed model Isurus biology 010604 marine biology & hydrobiology Environmental science Aquatic Science biology.organism_classification 010603 evolutionary biology 01 natural sciences Pacific ocean Ecology Evolution Behavior and Systematics
Zdroj:	Canadian Journal of Fisheries and Aquatic Sciences. 74:1765-1780
ISSN:	1205-7533 0706-652X
DOI:	10.1139/cjfas-2016-0327
Popis:	We develop a length-disaggregated, spatiotemporal, delta-generalized linear mixed model (GLMM) and apply the method to fishery-dependent catch rates of shortfin mako sharks (Isurus oxyrinchus) in the North Pacific. The spatiotemporal model may provide an improvement over conventional time-series and spatially stratified models by yielding more precise and biologically interpretable estimates of abundance. Including length data may provide additional information to better understand life history and habitat partitioning for marine species. Nominal catch rates were standardized using a GLMM framework with spatiotemporal and length composition data. The best-fitting model showed that most hotspots for “immature” shortfin mako occurred in the coastal waters of Japan, while hotspots for “subadult and adult” occurred in the offshore or coastal waters of Japan. We also found that size-specific catch rates provide an indication that there has been a recent increasing trend in stock abundance since 2008.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0b847ee6a2c22c5b1eac2bc3cf9ab21f https://doi.org/10.1139/cjfas-2016-0327 Zobrazit plný text záznamu Plný text ve formátu PDF