Mode of fertilization and parental care in anurans
Article Abstract:
Hypotheses explaining the sex of the parent that provides parental care generally puts the care of offsprings produced with internal fertilization on the mother and those from external fertilization on the father. However, an analysis of 334 anuran taxa based on concentrated changes tests revealed that parental care is randomly distributed between the sexes. On the other hand, the analysis of 396 taxa using Ridley's method revealed that there is a significant relationship between the sex of the rearing parent and the mode of fertilization. The implications of these findings are discussed.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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Porcine sex ratios and sex combinations within litters: comment on Meikle et al. (1997) and Mendl et al. (1997)
Article Abstract:
Some of the views of D.B. Meikle, et al, and M. Mendl, et al, regarding porcine sex ratios and sex combinations within the litters of the pig, Sus scrofa, invite comment. The dominant and subordinate sows would differ systematically in the profiles of one or more of oestrogen, testosterone, gonadotrophins and progesterone. Moroever, direct evidence is needed on the association between the sex ratio of porcine zygotes and the time within the fertile interval that the zygotes are being formed.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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Shared and unshared parental investment in the precocial goldeneye (Aves: Anatidae)
Article Abstract:
The cost of parental behavior among female goldeneye, Bucephala clangula, ws investigated to determine the applicability of the models of unshared and shared parental investment in this species. Measures of vigilance and intraspecific aggression were considerably higher among breeding females than broodless females. Although vigilant behavior was not dependent on brood size, intraspecific aggressive behavior increased with brood size.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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