Save

Associations with multiple male groups increase the energy expenditure of humpback whale (Megaptera novaeangliae) female and calf pairs on the breeding grounds

In: Behaviour
View More View Less
  • 1 Behavioural and Environmental Biology, School of Biology, Chemistry and Health Science, Manchester Metropolitan University, Manchester M1 5GD, UK
  • | 2 The Keiki Kohola Project, Lahaina, HI, USA, Department of Biology, California State University Channel Islands, Camarillo, CA, USA;, Email: rachel.cartwright@csuci.edu
Download Citation Get Permissions

Access options

Get access to the full article by using one of the access options below.

Institutional Login

Log in with Open Athens, Shibboleth, or your institutional credentials

Login via Institution

Purchase

Buy instant access (PDF download and unlimited online access):

€29.95$34.95

Abstract

In mammalian mating systems, where operational sex ratios are male skewed and males must compete for access to females, increased levels of male attention may amount to harassment of females and their offspring. To evaluate how male associations affect the behaviour of humpback whale (Megaptera novaeangliae) female and calf pairs in breeding regions, we compiled time budgets and monitored calf breathing regimes for females with calves in a range of associations, with (N = 71) and without (N = 19) males, in Hawaiian waters. We found that, while associations with a single male did not significantly change the behaviour of female–calf pairs, associations with multiple males led to increases in the time spent traveling (median increase 35%; p < 0.001) and decreases in time spent at rest (median decrease 29%; p < 0.001). Additionally, calves spent less time at the surface (median decrease from 10% to 0; p < 0.001) and the frequency of intermittent breaths between dives increased (median increase from 16 to 22%; p = 0.006). We show that these behavioural changes would require increased energy expenditure, which could impact calf fitness, and we speculate that the association between a female–calf pair and single male escort comprises a female counterstrategy that offsets male harassment, consistent with Mesnick's (1997) bodyguard hypothesis.

Content Metrics

All Time Past Year Past 30 Days
Abstract Views 720 275 13
Full Text Views 186 40 5
PDF Views & Downloads 90 55 8