Costs and benefits of polyandry in a placental poeciliid fish Heterandria formosa are in accordance with the parent-offspring conflict theory of placentation

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Publikationens författare: Ala-Honkola O, Friman E, Lindström K
Förläggare: WILEY-BLACKWELL
Publiceringsår: 2011
Tidskrift: Journal of Evolutionary Biology
Tidskriftsakronym: J EVOLUTION BIOL
Volym: 24
Nummer: 12
Artikelns första sida, sidnummer: 2600
Artikelns sista sida, sidnummer: 2610
Antal sidor: 11
ISSN: 1010-061X
eISSN: 1420-9101


Abstrakt

In viviparous species, a conflict over maternal resource allocation may arise between mothers and embryos, between siblings, and between maternal and paternal genes within an embryo due to relatedness asymmetries. We performed two experiments to study the effects of polyandry and brood relatedness on offspring growth in a placental fish (Heterandria formosa). Polyandry was beneficial as it increased the probability of pregnancy, possibly to avoid genetic incompatibility. However, females mated to four males produced offspring that had a longer maturation time than those of monandrous females. When within-brood relatedness was manipulated, the size of the newborn offspring decreased with time in low-relatedness treatment, whereas in highly related broods, offspring size was constant. Low within- brood relatedness may lead to less cooperative offspring in terms of resource extraction from the mother, which may lead to impaired development during gestation. Offspring conflict may thus reduce the benefits of polyandry in viviparous species.


Nyckelord

fish, Heterandria formosa, parent-offspring conflict, placenta, Poeciliidae, polyandry, viviparity, viviparity-driven conflict hypothesis

Senast uppdaterad 2020-20-01 vid 04:21