On Ignorance Regions and Spatial Aspects for South American sea lion (Otaria byronia) Operational Interaction with the Artisan Gillnet Fishery in Chile
The South Pacific Hake (Merluccius gayi) is the main artisan gillnet fishery in central Chile and the South American sea lion (SASL, Otaria byronia) has a strong operational interaction with this fishery. This was analyzed in paper  and several issues, like ignorance regions and spatial variation of such conflicts have not been studied in detail. In this paper we provide such analyses in order to complement the study. In particular, we show that construction of ignorance regions and its boundaries in the parameter space for SASL, dist, season4 and depth variables of interest could play an important role in order to characterize and possibly to eliminate the inaccuracies in the results and decisions that could be made.
We also checked Ripley’s K and Moran’s I in order to conduct spatial analysis using GIS tools. This may help to determine areas of conflict and how these vary in time and space. The interactions with sea lions are not a determining factor in the variation of artisan fishery catches and such observations are important for managing fisheries interactions and protection of marine species.
KeywordsSouth Pacific Hake (Merluccius gayi) Southern sea lion (Otaria byronia) Ignorance regions Spatial analysis
This study was supported by the Undersecretariat for Fisheries and Aquaculture, Chilean Government [Grant number 2013-115-DAP-35, “Characterization of the effects of principal artisan fisheries on marine ecosystems”], and Fondo de Investigación Pesquera [Grant number FIP 2014-29 “Population estimates for sea lions in Regions V, VI, VII and VIII”]. The authors acknowledge Tamara Martínez and Pablo Couve for collecting the SASL data in the field. Milan Stehlík acknowledges the support of project Fondecyt Regular No. 1151441 and LIT-2016-1-SEE-023 mODEC. Jean Paul Maidana acknowledges the support of the PhD. grant FIB-UV from the Universidad de Valparaíso. Maritza Sepúlveda acknowledges the support of the Iniciativa Científica Milenio from Chile’s Ministerio de Economía, Fomento y Turismo. The authors were supported by the bilateral projects Bulgaria - Austria, 2016 2019, Feasible statistical modelling for extremes in ecology and finance, Contract number 01/8, 23/08/2017 and WTZ Project No. BG 09/2017.
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