[MARMAM] New paper: Mechanisms for sex-based segregation in foraging behaviour by a polygynous marine carnivore

Marcus Salton marcussalton at gmail.com
Wed Aug 21 17:22:11 PDT 2019


Dear all,

My co-authors and I area pleased to bring to your attention the following
publication:

Salton M, Kirkwood R, Slip D, Harcourt R (2019) Mechanisms for sex-based
segregation in foraging behaviour by a polygynous marine carnivore. Mar
Ecol Prog Ser 624:213-226. https://doi.org/10.3354/meps13036
<https://doi.org/10.3354/meps13036>

ABSTRACT: Sexual segregation in foraging is often attributed to constraints
arising from sexual size dimorphism, such as differing physiological
abilities and energy requirements, or to reproductive commitments including
nutritional requirements and behavioural limitations such as parental care.
In species with sexual size dimorphism and a polygynous mating system,
there are sex differences in both body size and reproductive commitments,
so distinguishing the mechanism underlying sexually segregated foraging is
particularly difficult. We investigated movements of the sexually
dimorphic, polygynous Australian fur seal *Arctocephalus pusillus doriferus*,
and compared foraging strategies of juveniles to adults in order to
investigate foraging constraints associated with differences in body size
separately from those also associated with reproduction. Foraging trip
duration, range, core area, and distance to core area from the breeding
site were similar between the sexes in juveniles and adults, but juveniles
were overall more constrained than adults. After foraging trips, juveniles
and adult females were more likely to return to the breeding site than to
other sites, probably because of physiological limitations (juveniles) or
reproductive commitments (adult females). Freedom from reproductive
commitments allowed adult males to reside in areas away from the breeding
site and thereby meet the higher energy requirements arising from their
larger body size, without competing with adult females. Consequently,
intra-species differences in foraging strategies of Australian fur seals
are shaped first by foraging constraints associated with body size, and to
a lesser extent by reproductive behaviour.

The article can be download from:
https://www.int-res.com/abstracts/meps/v624/p213-226/ or you can email me
for a copy.

Best regards,
Marcus Salton
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