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首页> 外文期刊>ICES journal of marine science: International Council for the Exploration of the Sea journal of marine science >Variability in billfish vertical distribution and fishing interactions driven by environmental conditions in the Eastern Tropical Pacific Ocean
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Variability in billfish vertical distribution and fishing interactions driven by environmental conditions in the Eastern Tropical Pacific Ocean

机译：Variability in billfish vertical distribution and fishing interactions driven by environmental conditions in the Eastern Tropical Pacific Ocean

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摘要

Blue marlin (Makaira nigricans) and sailfish (Istiophorus platypterus) are ecologically important predators and valuable species throughout theworld’s recreational, commercial, and subsistence fisheries. Comparing multi-species vertical habitat use can inform ecological uncertaintiessuch as inter-species competition, as wel as relative vulnerabilities to fishing activities. In this study, we identified key differences in bothdepth use and which environmental variables drive these selections, which highlights the variability in the catchability both as target species in recreational fisheries and bycatch in commercial fisheries. To understand these two species’ vertical habitat use, we examined depth profilesfrom 26 sailfish and 48 blue marlin tagged with pop-up satellite archival tags deployed in the Eastern Tropical Pacific Ocean. While both speciesare surface-oriented, we found evidence of vertical niche partitioning where sailfish spend more time at deeper depths than blue marlin. Bluemarlin recorded an average mean depth of 18.5 m (±10.8 m) during daytime and 5.2 m (±5.5 m) at nighttime (Figure 31a), while sailfish recordedan average mean depth of 23.6 m (±11.1 m) during daytime and 6.45 m (±4.64 m) at nighttime. Generalized additive mixed models fitted topredict mean and max depth revealed sea level anomaly (SLA), oxygen, sea surface temperature, and mixed layer depth as significant predictorsof vertical habitat use for both species. We also examined catch logs from three recreational fishing lodges in Central America to understandthe inlfuence of environmental conditions on billifsh sightings per unit effort. For blue marlin and sailfish, SLA was a significant predictor in each of the four depth models (mean day, mean night, max day, max night). SLA was the variable with highest percent deviance explained for allfour sailfish depth models and three of the four blue marlin depth models and had a positive relationship with all response variables for all fourblue marlin depth models and three sailfish depth models (mean daytime, max daytime, max nighttime), where higher positive SLA values wereassociated with deeper depth responses.

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