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Artículo

Environmental influence on the inter-annual demographic variation of the narrownose smooth-hound shark (Mustelus schmitti, Springer 1939) in the Northern Argentine Coastal System (El Rincón, 38–42°S)

Jaureguizar, Andrés JavierIcon ; de Wysiecki, Agustín MaríaIcon ; Camiolo, Martina DanielaIcon
Fecha de publicación: 12/2020
Editorial: Taylor & Francis As
Revista: Marine Biology Research
ISSN: 1745-1000
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Ecología

Resumen

Understanding the environmental influence on the demographic structure of a shark population within a specific ecosystem has direct implications for developing effective management and conservation measures. We studied the physical environment influence on the inter-annual demographic variation of the narrownose smooth-hound shark (Mustelus schmitti) in a key coastal ecosystem. The analyses were based on the size assemblage concept of co-occurring length classes that share common traits. We used bottom-trawl datasets (n = 334) collected over 8 spring periods (1994-2012). The analyses indicated that the population was structured in eight size assemblages that represented its main ontogenetic levels. Those corresponding to sub-adult females, young adult males, and juveniles contributed to most of the population similarity. The population structure presented high (>57.7%) inter-annual dissimilarities and showed three main similarity levels with significant differences associated with a higher abundance and similarity contribution of the main assemblages. All size assemblages were more abundant in shallow (<34.5 m), warmer (>14.9 °C), and fresher (<33.24) waters. Although the temperature variations better explained the spatial distribution of abundance, the inter-annual variation in the population similarity matched the spatial coverage of low salinities (<33.5). Overall, the environmental variation explained the variability in the abundance of size assemblages in consecutive years.
Palabras clave: COASTAL SHARK , POPULATION SIMILARITY , POPULATION STRUCTURE , SIZE ASSEMBLAGES , SOUTHWEST ATLANTIC COASTAL SYSTEM , TEMPORAL VARIABILITY
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/138169
DOI: http://dx.doi.org/10.1080/17451000.2020.1868522
URL: https://www.tandfonline.com/doi/full/10.1080/17451000.2020.1868522
Colecciones
Articulos(CESIMAR)
Articulos de CENTRO PARA EL ESTUDIO DE SISTEMAS MARINOS
Citación
Jaureguizar, Andrés Javier; de Wysiecki, Agustín María; Camiolo, Martina Daniela; Environmental influence on the inter-annual demographic variation of the narrownose smooth-hound shark (Mustelus schmitti, Springer 1939) in the Northern Argentine Coastal System (El Rincón, 38–42°S); Taylor & Francis As; Marine Biology Research; 16; 8-9; 12-2020; 600-615
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