Lek mating systems, in which males aggregate at traditional sites to display for females that attend primarily for the purpose of fertilisation, are characterised by large inequalities in male mating success, and intense competition between males. It seems paradoxical, therefore, that males of one genus of lek mating manakins, <I>Chiroxiphia </I>(Aves: Pipridae), cooperate in dual-male displays for females. The benefits of this cooperation appear virtually unilateral, especially as males are not closely related. However, benefits to subordinates are offset in time, and relate primarily to ascent to dominance status. I studied the behaviour of Long-tailed Manakins <I>Chiroxiphia linearis</I> at a long-terms study site at Monteverde, Costa Rica, to investigate the physiological control of delayed breeding in subordinate males. The results presented here form a background to that study, and address issues relating to the roles of inter-and intrasexual selection in determining male mating success, the reproductive strategies employed by males, and the role of plumage in the establishment of dominance. Methods included the monitoring of male displays and female visitation at nine principal leks, and the gathering of morphological and plumage data, and blood samples from captured birds. Male mating success was determined by a combination of intra- and intersexual selection. Males at each lek form an orderly queue for dominant status, which among top-ranking males is linear. Only the dominant male, with rare exceptions, had access to mating opportunities. Females appear to discriminate between male queues on the basis of dual-male phenotypes relating to display performance.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:597751 |
| Date | January 2002 |
| Creators | Clay, R. P. |
| Publisher | University of Cambridge |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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