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\title{Low genetic variability and high isolation of a post-harvest South
American pinniped population as revealed by genome-wide SNPs}



\author[1]{Diego Peralta}%
\author[1]{Ezequiel Ibañez}%
\author[2]{Sergio Lucero}%
\author[2]{Humberto Cappozzo}%
\author[3]{Santiago Ceballos}%
\author[1]{Juan Ignacio Túnez}%
\affil[1]{Instituto de Ecología y Desarrollo Sustentable}%
\affil[2]{Museo Argentino de Ciencias Naturales Bernardino Rivadavia}%
\affil[3]{Universidad Nacional de Tierra del Fuego Antártida e Islas del Atlántico Sur}%


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  \date{May 24, 2024}


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\begin{abstract}
~\emph{Otaria flavescens} has been one of the most heavily exploited
pinnipeds during the last 200 years with depletions of about 90\% in
some colonies. After the prohibition on sealing in South America,
populations became stabilized except for the Uruguayan population, which
showed a constant decrease. The underlying causes of its decline are
unknown. This study used genome-wide SNPs to assess the variability and
connectivity of some of the most overexploited sea lion colonies in the
Atlantic Ocean. Our results revealed low allelic richness, nucleotide
diversity and heterozygosity in the Uruguayan population and evidence of
complete isolation from the Argentinean populations under study. In
contrast, the Patagonian populations showed a high degree of
connectivity, which could explain their recovery and high levels of
current diversity. Our study highlights the critical situation of the
Uruguayan sea lion population, emphasizing the need for maintaining the
continuous conservation efforts in the region. ~%
\end{abstract}%



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