Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F18%3A00494709" target="_blank" >RIV/60077344:_____/18:00494709 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1111/1365-2656.12800" target="_blank" >http://dx.doi.org/10.1111/1365-2656.12800</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/1365-2656.12800" target="_blank" >10.1111/1365-2656.12800</a>

Result language

angličtina

Original language name

Density regulation in Northeast Atlantic fish populations: Density dependence is stronger in recruitment than in somatic growth

Original language description

Population regulation is a central concept in ecology, yet in many cases its presence and the underlying mechanisms are difficult to demonstrate. The current paradigm maintains that marine fish populations are predominantly regulated by density-dependent recruitment. While it is known that density-dependent somatic growth can be present too, its general importance remains unknown and most practical applications neglect it. This study aimed to close this gap by for the first time quantifying and comparing density dependence in growth and recruitment over a large set of fish populations. We fitted density-dependent models to time-series data on population size, recruitment and age-specific weight from commercially exploited fish populations in the Northeast Atlantic Ocean and the Baltic Sea. Data were standardized to enable a direct comparison within and among populations, and estimated parameters were used to quantify the impact of density regulation on population biomass. Statistically significant density dependence in recruitment was detected in a large proportion of populations (70%), whereas for density dependence in somatic growth the prevalence of density dependence depended heavily on the method (26% and 69%). Despite age-dependent variability, the density dependence in recruitment was consistently stronger among age groups and between alternative approaches that use weight-at-age or weight increments to assess growth. Estimates of density-dependent reduction in biomass underlined these results: 97% of populations with statistically significant parameters for growth and recruitment showed a larger impact of density-dependent recruitment on population biomass. The results reaffirm the importance of density-dependent recruitment in marine fishes, yet they also show that density dependence in somatic growth is not uncommon. Furthermore, the results are important from an applied perspective because density dependence in somatic growth affects productivity and catch composition, and therefore the benefits of maintaining fish populations at specific densities.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10618 - Ecology

Project

<a href="/en/project/EE2.3.30.0032" target="_blank" >EE2.3.30.0032: Promotion of post-doctoral positions in the Biology Centre of the Czech Academy of Sciences aimed to build the global competitiveness of the research teams in the Czech Republic</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Animal Ecology

ISSN

0021-8790

e-ISSN

—

Volume of the periodical

87

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

672-681

UT code for WoS article

000430059900013

EID of the result in the Scopus database

2-s2.0-85042560250