Gross and Shine (1981)
report that with internal feritilisation parental care is carried out by females in 86% of species while with external fertilisation parental care is carried out by males in 70% of species
SUPPORTS the predictions based on paternal certainty
Krebs and Davies (1981)
report that males of some fish species release sperm first in a nest and then the female lays eggs, meaning that the male has the first opportunity to desert but the males carry out the childcare
GOES AGAINST the idea of the order gamete release hypothesis
Brase (2006)
FOUND - males who demonstrate cues of a positive disposition to parental investment were seen as more attractive by females
SUPPORTS the evolutionary explanation of parental investment
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