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DIGITAL.CSIC
Doctoral thesis . 2022
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Investigo
Doctoral thesis . 2021
Data sources: Investigo
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Doctoral thesis . 2021
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Investigo
Doctoral thesis . 2021
License: CC BY NC ND
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Ecology of recruitment in European hake: interaction between maternal effects, environment and fisheries

Authors: García Fernández, Cristina;

Ecology of recruitment in European hake: interaction between maternal effects, environment and fisheries

Abstract

[ES] La pesca es una actividad esencial en todo el mundo, no sólo por proporcionar una fuente de alimento de alta calidad nutricional sino también por ser motor económico y medio de vida en muchas regiones del planeta. En la actualidad, muchas de las poblaciones de peces sufren una presión pesquera elevada, lo que, en ocasiones, deriva en una sobreexplotación del recurso. Esta sobrexplotación provoca cambios en la estructura poblacional y puede producir el colapso del stock, impidiendo una explotación sostenible. Por ello, es fundamental regular la extracción de los recursos pesqueros utilizando el mejor conocimiento científico y socio-económico disponible. La evaluación pesquera utiliza modelos para predecir la capacidad de producción de una población y pronosticar su futuro a fin de controlar por medio de la gestión pesquera la actividad extractiva. Uno de los aspectos clave en esta evaluación es la relación S-R, es decir, la relación de la biomasa adulta (S) y los reclutas (R), entendiendo por reclutamiento el número de individuos que alcanzan una determinada edad, una vez superada las primeras etapas de mortalidad masiva. A partir de la biomasa de la población reproductora, se estima el reclutamiento anual y de la relación S-R se extraen los puntos de referencia biológicos que son usados en gestión pesquera. Sin embargo, se ha observado en muchas poblaciones explotadas un desacoplamiento en la relación S-R que dificulta la evaluación. Uno de los motivos es la asunción que hacen este tipo de modelos de una producción equivalente por parte de cada individuo de la población, sin tener en cuenta los efectos parentales sobre el potencial reproductivo de la población (PR). El PR se define como capacidad que tiene una población para producir descendencia viable que alcance la edad de reclutamiento y depende de diversos factores internos (por ejemplo, el tamaño o la condición de la hembra) y externos (por ejemplo, la disponibilidad de alimento y las condiciones ambientales) que modulan la dinámica de desove y la productividad

[EN] Fishing is an essential activity worldwide not only as a source of food but also as an economic livelihood. Currently, overfishing is a major problem in exploited stocks which triggers significant changes in the stock structure of many fish populations. This situation does not allow to maintain in a long-term a sustainable harvest. Hence, it is essential to regulate extraction of fishery resources to not to jeopardise the sustainability of fish stocks. Stock assessment use models to forecast the production capacity of a stock and predict its future in order to control fishing. One of the cornerstone of this assessment is the S-R relationship, i.e., the relation of the adult biomass (S) and the recruits (R), understanding by recruitment the number of individuals reaching a certain age, once the massive mortality of the early stages has been exceeded. Based on the spawning stock biomass (SSB), the annual recruitment is estimated and reference points for fisheries stock management are extracted from this relationship. However, it has been observed in several exploited stocks an uncoupling in the S-R relationship which hampers the assessment. One reason can be that these models assume an equal production by each individual in the population, without considering parental effects on stock reproductive potential (SRP). SRP is the ability of females to produce viable offspring that reach recruitment age. Egg production is affected by several internal (e.g., female size or condition) and external factors (e.g. food availability and environmental conditions) which modulate the spawning dynamics and productivity

La presente tesis ha sido posible gracias a la Beca predoctoral en Medioambiente concedida por la Fundación Tatiana Pérez de Guzmán el Bueno en el año 2017. Además, a los proyectos de la Agencia Española de Investigación: Ecología del reclutamiento de la merluza: implicaciones sobre la gestión del recurso (CTM2010-21856-C03-00) y Dinámica del reclutamiento de la Merluza Europea (CTM2015-66676-C2)

333 pages

No

Country
Spain
Keywords

2401.06 Ecología Animal, 5102.08 Pesca, 3105.10 Dinámica de las Poblaciones

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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