کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2193579 1098386 2013 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Sexual dimorphism of Dall's porpoise and harbor porpoise skulls
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
Sexual dimorphism of Dall's porpoise and harbor porpoise skulls
چکیده انگلیسی

To evaluate and quantify sexual dimorphism of skull shape and assess the ontogenetic background for differences, samples of 134 harbor porpoise (Phocoena phocoena) and 85 Dall's porpoise (Phocoenoides dalli) were compared in terms of cranial shape and shape ontogeny using three-dimensional geometric morphometrics. After correction for allometry, no sexual differences were detected in harbor porpoise, while Dall's porpoise showed statistically significant sexual dimorphism of skull shape. Since no sex-specific differences were detected in the directionalities of the ontogenetic vectors, we cannot reject that the dimorphism is innate. Based on the different mating systems of the two species and the lack of sexual dimorphism in the harbor porpoise, the dimorphism in Dall's porpoise is most likely a result of sexual selection in relation physical competition for mates given that male skulls provide room for larger neck muscles with a more favorable lever arm.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mammalian Biology - Zeitschrift für Säugetierkunde - Volume 78, Issue 2, February 2013, Pages 153–156
نویسندگان
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