Section: Ecology
Topic: Ecology, Population biology

The dynamics of spawning acts by a semelparous fish and its associated energetic costs

10.24072/pcjournal.56 - Peer Community Journal, Volume 1 (2021), article no. e49.

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During the reproductive season, animals have to manage both their energetic budget and gamete stock. In particular, for semelparous capital breeders with determinate fecundity and no parental care other than gametic investment, the depletion of energetic stock must match the depletion of gametic stock, so that individuals get exhausted just after their last egg is laid and fertilized. Although these budgets are managed continuously, monitoring the dynamics of mating acts and energy expenditure at a fine temporal scale in the wild is challenging. This study aimed to quantify the individual dynamics of spawning acts and the concomitant energy expenditure of female Allis shad (Alosa alosa) throughout their mating season. Using eight individual-borne accelerometers for one month, we collected tri-axial acceleration, temperature, and pressure data that we analysed to i) detect the timing of spawning acts, ii) estimate energy expenditure from tail beat frequency and water temperature, and iii) monitor changes in body roundness from the position of the dorsally-mounted tag relative to the vertical plane. Female shad had a higher probability to spawn during warmer nights, and their spawning acts were synchronized (both individually and inter-individually) within each active night. They experienced warmer temperature, remained deeper, swan more slowly and spent less energy during daytime than night time. Over one month of spawning, they performed on average 15.75 spawning acts, spent on average 6 277 kJ and died with a significant portion of residual oocytes. The acceleration-based indicator of body roundness was correlated to condition coefficient measured at capture, and globally decreased through the spawning season, although the indicator was noisy and was not correlated to changes in estimated energy expenditure. Despite significant individual variability, our results indicate that female shad exhausted their energetic stock faster than their egg stock. Water warming will increase the rate of energy expenditure, which might increase the risk that shad die with a large stock of unspent eggs. Although perfectible, the three complementary analyses of acceleration data are promising for in situ monitoring of energy expenditure related to specific behaviour.

Published online:
DOI: 10.24072/pcjournal.56
Type: Research article

Tentelier, Cédric 1, 2; Bouchard, Colin 1, 3, 2; Bernardin, Anaïs 2; Tauzin, Amandine 2; Aymes, Jean-Christophe 1, 2; Lange, Frédéric 1, 2; Recapet, Charlotte 1, 2; Rives, Jacques 1, 2

1 Pôle Gestion des Migrateurs Amphihalins dans leur Environnement, OFB, INRAE, AGROCAMPUS OUEST, UNIV PAU & PAYS ADOUR/E2S UPPA
2 Universite de Pau et des Pays de l’Adour, E2S UPPA, INRAE, ECOBIOP, Saint-Pée-surNivelle, France
3 Tour du Valat, Research Institute for the Conservation of Mediterranean Wetlands, Arles, France
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
     author = {Tentelier, C\'edric and Bouchard, Colin and Bernardin, Ana{\"\i}s and Tauzin, Amandine and Aymes, Jean-Christophe and Lange, Fr\'ed\'eric and Recapet, Charlotte and Rives, Jacques},
     title = {The dynamics of spawning acts by a semelparous fish and its associated energetic costs},
     journal = {Peer Community Journal},
     eid = {e49},
     publisher = {Peer Community In},
     volume = {1},
     year = {2021},
     doi = {10.24072/pcjournal.56},
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AU  - Aymes, Jean-Christophe
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AU  - Recapet, Charlotte
AU  - Rives, Jacques
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%A Tentelier, Cédric
%A Bouchard, Colin
%A Bernardin, Anaïs
%A Tauzin, Amandine
%A Aymes, Jean-Christophe
%A Lange, Frédéric
%A Recapet, Charlotte
%A Rives, Jacques
%T The dynamics of spawning acts by a semelparous fish and its associated energetic costs
%J Peer Community Journal
%D 2021
%V 1
%I Peer Community In
%R 10.24072/pcjournal.56
%F 10_24072_pcjournal_56
Tentelier, Cédric; Bouchard, Colin; Bernardin, Anaïs; Tauzin, Amandine; Aymes, Jean-Christophe; Lange, Frédéric; Recapet, Charlotte; Rives, Jacques. The dynamics of spawning acts by a semelparous fish and its associated energetic costs. Peer Community Journal, Volume 1 (2021), article  no. e49. doi : 10.24072/pcjournal.56.

PCI peer reviews and recommendation, and links to data, scripts, code and supplementary information: 10.24072/pci.ecology.100060

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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