week 2 - post copulatory sexual selection and sexual conflict in the evolution of male pregnancy PAZCOLT AND JONES 2010 Flashcards
authors
pazcolt and jones 2010
male pregnancy in sea horses, pipefishes and sea dragons (family ________), represent a striking reproductive adaptation that has shaped the evolution of behaviour and morphology in this group of fishes
syngnathidae
how do the males brood their offspring?
in a specialised pouch
what is an unexplored possibility about this pouch?
brood pouch evolution was partly shaped by parent-offspring or sexual conflict processes that would result in trade offs between current and future pregnancies
what did pazcolt and jones 2010 do?
controlled breeding experiment using gulf pipe fish
to test or post copulatory sexual selection within broods and for trade offs between successive male pregnancies as functions of female attractiveness
what did pazcolt and jones 2010 find? (2)
offspring survivorship within a pregnancy was affected by the size of a males mate, the number of eggs transferred and the males sexual responsiveness
embryo survivorship in a current pregnancy was negatively related to survivorship in the prior pregnancy
what are the implications of pazcolt and jones 2010 results?
demonstrate a fitness trade off between broods.
post copulatory sexual selection and sexual conflict occur in gulf pipe fish
what is the conflict mediated by?
a strategy of cryptic choice in which males increase rates of offspring abortion in pregnancies from unattractive mothers to retain resources for future reproductive opportunities
so the male brood pouch of syngnathid fishes that nurture offspring also seems to have an important role as an arbiter of _____ ____ ____
conflict between the sexes
What has recent work established about the passing of nutrients in brood pouches? what question does this raise
that nutrients move from both the father to offspring and offspring to father during the preganancy
raising the hitherto unexplored possibility that the brood pouch may have a role in modulating post copulatory sexual selection and sexual conflict
what are the 2 important findnigs of this paper in terms of nature worthy?!
post copulatory sexual selection has been virtually unexamined in sex role reversal taxa
brood pouch grants the male better control over reproduction
