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Billfish Behavior and Habitat Use in...

Pohlot, Bruce Gibbs.

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Billfish Behavior and Habitat Use in the Presence of Environmental Forcing and Commercial Exploitation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Billfish Behavior and Habitat Use in the Presence of Environmental Forcing and Commercial Exploitation./
作者:	Pohlot, Bruce Gibbs.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	306 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
Contained By:	Dissertations Abstracts International81-05B.
標題:	Biology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22589605
ISBN:	9781088373309

Billfish Behavior and Habitat Use in the Presence of Environmental Forcing and Commercial Exploitation.
Pohlot, Bruce Gibbs.

Billfish Behavior and Habitat Use in the Presence of Environmental Forcing and Commercial Exploitation. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 306 p.

Source: Dissertations Abstracts International, Volume: 81-05, Section: B.

Thesis (Ph.D.)--University of Miami, 2019.

This item must not be sold to any third party vendors.

The Pacific Sailfish (Istiophorus platypterus) and Blue Marlin (Makaira nigricans) are vital resources to Central American economies along the eastern tropical Pacific Ocean through recreational catch-and-release sport fisheries and as retainable bycatch mostly in commercial longline tuna and mahi fisheries. Incidental billfish mortality resulting from bycatch reduces population abundance and negatively impacts catch rates in economically important recreational fisheries. Recreational and artisanal billfish fisheries management in the region is left to individual countries which rarely have fishery statistical systems or the means to independently assess such fisheries, resulting in a lack of fishery dependent catch data especially for less commercially valued species such as the billfish. Because of observed stock declines and a lack of a formal stock assessment research, there exists an immediate need to understand Pacific Sailfish and Blue Marlin population dynamic characteristics to understand exploitation and design fishery regulations to protect the species and fisheries. Therefore, the goal of this dissertation was to understand the Pacific Sailfish and Blue Marlin behavior and dynamic habitat use in the Eastern Pacific Ocean (EPO) in support of billfish conservation programs based on a species ecosystem analysis framework. This dissertation utilized newly developed methods to assess intra-daily sailfish behavior and sensory strategies using advanced technologies and data collection in accelerometry never before applied to non-captive animals. Sailfish activity data revealed a strong photokinetic response to light intensity confirming the visual system of billfish and the available light within their habitat to be driving factors in intra-daily feeding behavior. A behavioral modeling technique applied for the first time to billfish was incorporated into long term migratory analysis revealing differentiated behavioral characteristics between sailfish and blue marlin relative to migratory speed and distances as well as spatial foraging versus searching behavioral patterns. Behavioral modelling parameter values and daily activity levels were used to infer post-satellite tag release behavior indicating that recovery periods exist in both sailfish and blue marlin following recreational catch and release. These behavioral parameters along with geo-referenced sailfish and blue marlin purse seine catch statistics were analyzed via generalized additive models (GAM) using divergence, vorticity, sea surface temperature, and chlorophyll-a as explanatory variables. GAM models revealed a lack of association between sailfish and the explanatory variables, but a stronger relationship existed between blue marlin behavior and the explanatory variables. These differences were associated to significant differences in spatial migratory patterns between the two species. Tuna purse seine catch rates were determined not to indicate distribution or relative abundance for either sailfish or blue marlin due to the bycatch nature of these species within the fishery and their very low incidental catch. Finally, an analysis of dispersal range of sailfish and blue marlin revealed the extent and residency of sailfish and blue marlin migratory ranges within exclusive economic zones indicating a need for management to be applied over large transnational spatial scales. It was found that sailfish and blue marlin have local hotspots within the EPO with sailfish showing preference for the outer edges of the Costa Rica Dome and blue marlin having a clear association with the Coco's Island Ridge region characterized by an abundance of fish aggregating devices.

ISBN: 9781088373309Subjects--Topical Terms:

522710
Biology.
Subjects--Index Terms:

Behavior

Billfish Behavior and Habitat Use in the Presence of Environmental Forcing and Commercial Exploitation.
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