Disentangling the Drivers of a Piscivorous Intra‐Annual Cohort and the Contributions of Three Cohorts to Early‐Year Class Strength in Pikeperch ( <i>Sander lucioperca</i> )

ABSTRACT Using pikeperch ( Sander lucioperca ) as a model species, we investigated the factors influencing fluctuations in the abundance of piscivorous intra‐annual cohorts and assessed the role of three distinct cohorts: extremely small (ES), ordinary (or mid‐sized) fingerlings, and piscivorous in shaping year‐class strength. Our analysis was based on 13 years of data (2003–2024) collected in the Lipno Reservoir, Czechia. Using LASSO for variable selection among 45 potential covariates and subsequent Generalized Additive Model (GAM) construction, our results revealed that a higher abundance of ES conspecifics and young‐of‐the‐year (YOY) perch, coupled with increased densities of large cladocerans in July, positively impacted the abundance of the piscivorous intra‐annual cohort. The abundance of 1+ pikeperch was positively influenced by the abundance of piscivorous and ordinary cohorts recorded in the preceding year. We concluded that all three intra‐annual cohorts contribute to the year‐class strength of pikeperch, with piscivorous and ordinary cohorts having a more direct effect, while ES intra‐annual cohorts indirectly support the piscivorous cohort by serving as prey.

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Publication Details

Journal
Fisheries Management and Ecology
Published
2026-02-11
DOI
https://doi.org/10.1111/fme.70059
Primary Topic
Fish Ecology and Management Studies
Type
article
Field-Weighted Citation Impact
0.00

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article

Disentangling the Drivers of a Piscivorous Intra‐Annual Cohort and the Contributions of Three Cohorts to Early‐Year Class Strength in Pikeperch ( Sander lucioperca )

Radka Symonová, Martin Čech, Karlos Ribeiro de Moraes, Milan Říha et al.
Fisheries Management and Ecology
Fish Ecology and Management Studies
article

Disentangling the Drivers of a Piscivorous Intra‐Annual Cohort and the Contributions of Three Cohorts to Early‐Year Class Strength in Pikeperch ( Sander lucioperca )

Radka Symonová, Martin Čech, Karlos Ribeiro de Moraes, Milan Říha, Petr Blabolil, Zuzana Sajdlová, Kateřina Soukalová, Josef Hejzlar, Million Tesfaye, Daniel Bartoň, Tomáš Jůza, Luboš Kočvara, Jan Kubečka, Marek Šmejkal, Milan Muška, Carlos A. Martínez, Allan Tainá Souza, M. Vašek, Marek Brabec, Vladislav Draštík, Marie Prchalová, Michal Tušer
article en

Abstract

ABSTRACT Using pikeperch ( Sander lucioperca ) as a model species, we investigated the factors influencing fluctuations in the abundance of piscivorous intra‐annual cohorts and assessed the role of three distinct cohorts: extremely small (ES), ordinary (or mid‐sized) fingerlings, and piscivorous in shaping year‐class strength. Our analysis was based on 13 years of data (2003–2024) collected in the Lipno Reservoir, Czechia. Using LASSO for variable selection among 45 potential covariates and subsequent Generalized Additive Model (GAM) construction, our results revealed that a higher abundance of ES conspecifics and young‐of‐the‐year (YOY) perch, coupled with increased densities of large cladocerans in July, positively impacted the abundance of the piscivorous intra‐annual cohort. The abundance of 1+ pikeperch was positively influenced by the abundance of piscivorous and ordinary cohorts recorded in the preceding year. We concluded that all three intra‐annual cohorts contribute to the year‐class strength of pikeperch, with piscivorous and ordinary cohorts having a more direct effect, while ES intra‐annual cohorts indirectly support the piscivorous cohort by serving as prey.

Fisheries Management and Ecology
Pontificia Universidad Católica de Valparaíso (CL), University of Helsinki (FI), Czech Academy of Sciences (CZ), University of South Bohemia in České Budějovice (CZ), Czech Academy of Sciences, Institute of Sociology (CZ), Czech Academy of Sciences, Institute of History (CZ), Institute of Hydrobiology, Biology Centre, Academy of Sciences of the Czech Republic (CZ), Czech Academy of Sciences, Institute of Computer Science (CZ)
Akademie Věd České Republiky, Biologické Centrum, Akademie Věd České Republiky
Openalex Percentile: Top 70%
Fish Ecology and Management Studies
DOIOpen Access PDFOpenAlex
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