Sexual dimorphism in body shape without sexual dimorphism in body size in water skinks (Eulamprus quoyii)

被引:61
|
作者
Schwarzkopf, L [1 ]
机构
[1] James Cook Univ, Sch Trop Biol, Townsville, Qld 4811, Australia
关键词
Enlamprus quoyii; head size; limb lengths; lizards; mass; natural selection; sexual selection;
D O I
10.1655/04-66
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
Sexual dimorphism in body size is often accompanied by shape dimorphism. Shape dimorphism may be selected directly, or may be an indirect result of selection for size dimorphism. To determine whether shape differences are likely to have been directly influenced by selection, the indirect effects of size dimorphism oil shape can be removed statistically, the approach of most previous studies, or, alternatively, we can examine the patterns of shape dimorphism in species that are not size dimorphic. Here I describe sexual shape dimorphism in adults and neonates of a lizard that is not dimorphic in body length, the eastern water skink (Enlamprus quoyii). In this species, snout-vent length is not significantly different between adult or neonate males and females, but there are significant shape differences between sexes in both adults and neonates. For a given body length, adult males have wider heads, longer limbs, shorter trunk length (the distance between the forelimb and the hindlimb), and greater mass than females. In addition, head width, forelimb length and mass increase significantly more rapidly with body length in adult males than in females, whereas the rate of change of hindlimb length and trunk length with length is not significantly different in males and females. The shape of the body is more similar in neonates than adults, but female neonates have significantly longer trunks than males. The intersexual shape difference in neonate E. quoyii suggests that. although growth rate differences anion, body parts are the main source of differences in shape between adults. the difference between male and female interlimb lengths is present initially. Shape differences present at birth that are preserved until adulthood are less common than growth differences as a source of adult shape differences. The intersexual shape differences among adult E. quoyii are similar to those reported for species that are sexually size dimorphic, suggesting that selective forces have influenced body shape in similar ways in both size dimorphic and nondimorphic species, and that allometric relationships alone may not be responsible for shape differences between males and females in size dimorphic species.
引用
收藏
页码:116 / 123
页数:8
相关论文
共 50 条
  • [21] On the evolution of body size and of sexual dimorphism in corbiculate bees
    del Castillo, Raul Cueva
    Sanabria-Urban, Salomon
    Castillo-Argaez, Raiza
    Quezada-Euan, Jose Javier G.
    BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, 2024, 141 (03) : 348 - 363
  • [22] Sexual Size Dimorphism and Body Condition in the Australasian Gannet
    Angel, Lauren P.
    Wells, Melanie R.
    Rodriguez-Malagon, Marlenne A.
    Tew, Emma
    Speakman, John R.
    Arnould, John P. Y.
    PLOS ONE, 2015, 10 (12):
  • [23] Sexual dimorphism in shape and size of the neurocranium
    Diana H. Toneva
    Silviya Y. Nikolova
    Elena D. Tasheva-Terzieva
    Dora K. Zlatareva
    Nikolai E. Lazarov
    International Journal of Legal Medicine, 2022, 136 : 1851 - 1863
  • [24] Sexual dimorphism in shape and size of the neurocranium
    Toneva, Diana H.
    Nikolova, Silviya Y.
    Tasheva-Terzieva, Elena D.
    Zlatareva, Dora K.
    Lazarov, Nikolai E.
    INTERNATIONAL JOURNAL OF LEGAL MEDICINE, 2022, 136 (06) : 1851 - 1863
  • [25] Sexual dimorphism in lizard body shape: The roles of sexual selection and fecundity selection
    Olsson, M
    Shine, R
    Wapstra, E
    Ujvari, B
    Madsen, T
    EVOLUTION, 2002, 56 (07) : 1538 - 1542
  • [26] Body Size, Size Variation, and Sexual Size Dimorphism in Early Homo
    Plavcan, J. Michael
    CURRENT ANTHROPOLOGY, 2012, 53 : S409 - S423
  • [27] Sexual dimorphism in body shape of Chiasognathus grantii ( Coleoptera: Lucanidae)
    Vergara, Olivia P.
    Benitez, Hugo A.
    Pincheira, Melissa
    Jerez, Viviane
    REVISTA COLOMBIANA DE ENTOMOLOGIA, 2014, 40 (01): : 104 - 110
  • [28] Sexual dimorphism in the Greek tortoise: A test of the body shape hypothesis
    Kaddour, Khalid Ben
    El Mouden, El Hassan
    Slimani, Tahar
    Bonnet, Xavier
    Lagarde, Frederic
    CHELONIAN CONSERVATION AND BIOLOGY, 2008, 7 (01) : 21 - 27
  • [29] Is sexual body shape dimorphism consistent in aquatic and terrestrial chelonians?
    Bonnet, Xavier
    Delmas, Virginie
    El-Mouden, Hassan
    Slimani, Tahar
    Sterijovski, Bogoljub
    Kuchling, Gerald
    ZOOLOGY, 2010, 113 (04) : 213 - 220
  • [30] Analysis of Evolutionary Patterns and Rates of Sexual Size Dimorphism and Sexual Shape Dimorphism in Turtles
    Hlesciak, M. T.
    Stayton, C. T.
    INTEGRATIVE AND COMPARATIVE BIOLOGY, 2017, 57 : E72 - E72