Exposing changing phenology of fish larvae by modeling climate effects on temporal early life-stage shifts

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http://hdl.handle.net/10138/330207

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Weigel , B , Mäkinen , J , Kallasvuo , M & Vanhatalo , J 2021 , ' Exposing changing phenology of fish larvae by modeling climate effects on temporal early life-stage shifts ' , Marine Ecology. Progress Series , vol. 666 , pp. 135-148 . https://doi.org/10.3354/meps13676

Title: Exposing changing phenology of fish larvae by modeling climate effects on temporal early life-stage shifts
Author: Weigel, Benjamin; Mäkinen, Jussi; Kallasvuo, Meri; Vanhatalo, Jarno
Contributor: University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, Environmental and Ecological Statistics Group
University of Helsinki, Department of Mathematics and Statistics
Date: 2021-05-20
Language: eng
Number of pages: 14
Belongs to series: Marine Ecology. Progress Series
ISSN: 0171-8630
URI: http://hdl.handle.net/10138/330207
Abstract: Changing environmental conditions are influencing the seasonal timing in life history events of organisms. Such shifts in phenology are often linked to increasing temperatures that stimulate faster developments or earlier arrivals. This phenomenon has been demonstrated in terrestrial and aquatic realms, but data and knowledge are limited on how early life stages of fish are affected over long-term and broad environmental scales. Here, we analyze 2 decades (1974-1996) of size class-specific Baltic herring Clupea harengus membras L. larval data along the whole coast of Finland to expose shifts in phenology linked to changes in environmental covariates. We use a novel Bayesian hierarchical spatio-temporal hurdle model that describes larval occurrence and abundance with separate processes. Abundances are modeled with the Ricker population growth model that enables us to predict size-specific larvae groups in relation to the environment while accounting for population density dependence. We quantify shifts in phenology at multiple life stages, based on first appearances of smallest larvae (<10 mm) and by detection of higher proportions of larger larvae (>15 mm) appearing earlier than they have done historically. Our results show a strong signal in shifting phenology of the larvae toward an earlier development of 7.7 d per decade. Increasing temperature had a positive effect on the earlier development of larger larvae. Additionally, we highlight that the survival of larvae becomes more density dependent as their size increases. Our modeling framework can reveal phenological shifts of early life stages in relation to environmental change for survey data that do not necessarily cover the onset of reproduction.
Subject: 1181 Ecology, evolutionary biology
1172 Environmental sciences
Baltic Sea
Phenology
Climate change
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