期刊论文详细信息
Marine Ecology Progress Series
Estimating the risk of loggerhead turtle Caretta caretta bycatch in the US mid-Atlantic using fishery-independent and -dependent data
Kimberly T. Murray1  Christopher D. Orphanides1 
关键词: Loggerhead turtle;    Bycatch;    Fishery-independent data;    Fishery-dependent data;    Generalized additive model;    Northwest Atlantic;   
DOI  :  10.3354/meps10173
学科分类:海洋学与技术
来源: Inter-Research
PDF
【 摘 要 】

ABSTRACT: The incidental capture, or bycatch, of loggerhead sea turtles Caretta caretta in commercial fishing gear is considered a significant threat to their recovery. Bycatch analyses that use fishery-dependent data only reflect the spatial and temporal co-occurrence of turtles and fishing effort and therefore do not directly reveal conditions associated with turtle distributions. Fishery-independent and -dependent data can be used together to identify environmental conditions associated with turtle presence and the subsequent risk of a bycatch encounter if fishing effort is present. We developed generalized additive models (GAMs) to describe fishery-independent encounter rates of loggerheads observed in aerial and resource surveys in the US mid-Atlantic region as a function of environmental variables. We then fit a fishery-independent GAM to fishery-dependent data collected from commercial gillnet, bottom trawl, and scallop dredge fisheries in the mid-Atlantic region, and tested the model on new fishery-dependent data to assess how well the model predicted bycatch events. The preferred model describes fishery-independent encounter rates as a function of latitude, sea-surface temperature, depth, and salinity. When this model was fit to fishery-dependent data and tested on new data, it predicted 85% of the observed bycatch events when grouped by latitude and season, although it underestimated bycatch events in southern latitudes in winter. We identify times and areas of elevated bycatch risk on which to focus future conservation efforts and observer coverage.

【 授权许可】

Unknown   

【 预 览 】
附件列表
Files Size Format View
RO201912010135413ZK.pdf 8KB PDF download
  文献评价指标  
  下载次数:8次 浏览次数:42次