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Filial cannibalismin a nest-guarding fish: females prefer to spawn in nests with few eggs over many

Författare och institution:
Maria Norevik Andrén (Institutionen för biologi och miljövetenskap); Charlotta Kvarnemo (Institutionen för biologi och miljövetenskap)
Publicerad i:
Behavioral Ecology and Sociobiology, 68 ( 10 ) s. 1565-1576
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
In fish, fecundity correlates with female body size and egg-tending males often eat small broods. Therefore, small females may prefer to spawn in nests that already contain many eggs, to ensure the brood is as large as possible. In contrast, large females may prefer nests with few eggs, if high egg number or density has a negative effect on egg survival, or if there are drawbacks of spawning last in a nest. To test the hypothesis that female body size affects nest (and male mate) choice, using the sand goby (Pomatoschistus minutus), we allowed small and large females to choose between two males that were matched in size—one guarding a small clutch and the other a large clutch, respectively. We recorded where females spawned (measure of female preference), the combined brood size, male courtship, egg care and nest building. We also quantified the effect of brood size and egg density on egg survival in a separate data set. Although the combined broods did not exceed the small brood sizes that are at risk of being eaten, both small and large females preferred to spawn in nests with smaller clutch sizes. This preference could not be explained by more courtship or male parental effort, nor by reduced survival of larger or denser broods. Instead, our result might be explained by females avoiding the danger of cannibalism of young eggs by males or the risk of reduced egg health associated with being near the nest periphery.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Biologiska vetenskaper
Biologiska vetenskaper ->
Ekologi ->
Marin ekologi
Biologiska vetenskaper ->
Ekologi ->
Etologi och beteendeekologi
Brood reduction, Clutch size, Courtship intensity, Female choice, Filial cannibalism, Gobidae, Mate choice, Reproductive success
Postens nummer:
Posten skapad:
2014-08-22 16:25
Posten ändrad:
2014-09-30 15:44

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