BIOL 345 Lecture Notes - Lecture 17: Black Eagle, Selectin, Great Blue Heron
12 Nov 2017
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Moving further north biparental care is more common. Male barn swallows scale back parental contribution if food is limiting while females do not. Males also scale back with more female epcs. Male house wren contributes more than does female when food is scarce. Male snow bunting feeds female during her incubation. Related lapland longspur in the same habitat does not. Snow bunting nests in cold cavities (female cannot leave eggs continuous incubation). Temperature profile between two nests is enough to stimulate different responses in males. Parental investment amplifies effect of genetic complementarity on growth rates in song sparrows. Individuals paired with attractive mates may invest more in offspring. Song sparrows with genetically dissimilar parents grew faster than did nestlings whose parents were genetically more similar to one another. Females adjust level of care according to genetic diversity of their offspring parental investment can amplify complementary gene effects on fitness. Mammals: 90% of genera have primarily female care (lactation).
