Analysing the natural population growth of a large marine mammal after a depletive harvest

Abstract An understanding of the underlying processes and comprehensive history of population growth after a harvest-driven depletion is necessary when assessing the long-term effectiveness of management and conservation strategies. The South American sea lion (SASL), Otaria flavescens, is the most...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	M. A. Romero, M. F. Grandi, M. Koen-Alonso, G. Svendsen, M. Ocampo Reinaldo, N. A. García, S. L. Dans, R. González, E. A. Crespo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/380b8ff407a744cda32c7ee5071d7187
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:380b8ff407a744cda32c7ee5071d7187
record_format	dspace
spelling	oai:doaj.org-article:380b8ff407a744cda32c7ee5071d71872021-12-02T11:40:32ZAnalysing the natural population growth of a large marine mammal after a depletive harvest10.1038/s41598-017-05577-62045-2322https://doaj.org/article/380b8ff407a744cda32c7ee5071d71872017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05577-6https://doaj.org/toc/2045-2322Abstract An understanding of the underlying processes and comprehensive history of population growth after a harvest-driven depletion is necessary when assessing the long-term effectiveness of management and conservation strategies. The South American sea lion (SASL), Otaria flavescens, is the most conspicuous marine mammal along the South American coasts, where it has been heavily exploited. As a consequence of this exploitation, many of its populations were decimated during the early 20th century but currently show a clear recovery. The aim of this study was to assess SASL population recovery by applying a Bayesian state-space modelling framework. We were particularly interested in understanding how the population responds at low densities, how human-induced mortality interplays with natural mechanisms, and how density-dependence may regulate population growth. The observed population trajectory of SASL shows a non-linear relationship with density, recovering with a maximum increase rate of 0.055. However, 50 years after hunting cessation, the population still represents only 40% of its pre-exploitation abundance. Considering that the SASL population in this region represents approximately 72% of the species abundance within the Atlantic Ocean, the present analysis provides insights into the potential mechanisms regulating the dynamics of SASL populations across the global distributional range of the species.M. A. RomeroM. F. GrandiM. Koen-AlonsoG. SvendsenM. Ocampo ReinaldoN. A. GarcíaS. L. DansR. GonzálezE. A. CrespoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-16 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. A. Romero M. F. Grandi M. Koen-Alonso G. Svendsen M. Ocampo Reinaldo N. A. García S. L. Dans R. González E. A. Crespo Analysing the natural population growth of a large marine mammal after a depletive harvest
description	Abstract An understanding of the underlying processes and comprehensive history of population growth after a harvest-driven depletion is necessary when assessing the long-term effectiveness of management and conservation strategies. The South American sea lion (SASL), Otaria flavescens, is the most conspicuous marine mammal along the South American coasts, where it has been heavily exploited. As a consequence of this exploitation, many of its populations were decimated during the early 20th century but currently show a clear recovery. The aim of this study was to assess SASL population recovery by applying a Bayesian state-space modelling framework. We were particularly interested in understanding how the population responds at low densities, how human-induced mortality interplays with natural mechanisms, and how density-dependence may regulate population growth. The observed population trajectory of SASL shows a non-linear relationship with density, recovering with a maximum increase rate of 0.055. However, 50 years after hunting cessation, the population still represents only 40% of its pre-exploitation abundance. Considering that the SASL population in this region represents approximately 72% of the species abundance within the Atlantic Ocean, the present analysis provides insights into the potential mechanisms regulating the dynamics of SASL populations across the global distributional range of the species.
format	article
author	M. A. Romero M. F. Grandi M. Koen-Alonso G. Svendsen M. Ocampo Reinaldo N. A. García S. L. Dans R. González E. A. Crespo
author_facet	M. A. Romero M. F. Grandi M. Koen-Alonso G. Svendsen M. Ocampo Reinaldo N. A. García S. L. Dans R. González E. A. Crespo
author_sort	M. A. Romero
title	Analysing the natural population growth of a large marine mammal after a depletive harvest
title_short	Analysing the natural population growth of a large marine mammal after a depletive harvest
title_full	Analysing the natural population growth of a large marine mammal after a depletive harvest
title_fullStr	Analysing the natural population growth of a large marine mammal after a depletive harvest
title_full_unstemmed	Analysing the natural population growth of a large marine mammal after a depletive harvest
title_sort	analysing the natural population growth of a large marine mammal after a depletive harvest
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/380b8ff407a744cda32c7ee5071d7187
work_keys_str_mv	AT maromero analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest AT mfgrandi analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest AT mkoenalonso analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest AT gsvendsen analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest AT mocamporeinaldo analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest AT nagarcia analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest AT sldans analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest AT rgonzalez analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest AT eacrespo analysingthenaturalpopulationgrowthofalargemarinemammalafteradepletiveharvest
_version_	1718395573944451072

Analysing the natural population growth of a large marine mammal after a depletive harvest

Ejemplares similares