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Offspring size variation in a hybrid zone of Australian frogs (Geocrinia laevis complex, Myobatrachinae)

Offspring size variation in a hybrid zone of Australian frogs (Geocrinia laevis complex,... <jats:sec><jats:title>Abstract</jats:title><jats:p>To describe variation in size of offspring across a hybrid zone between the myobatrachine frogs Geocrinia laevis and Geocrinia victoriana, the sizes of tadpoles hatching from egg masses collected in the field were measured. Hatchling size was strongly correlated with diameter of the blastula or gastrula (referred to here as "egg size"). Geocrinia victoriana had bigger offspring than G. laevis. Hybrids were generally intermediate between the two parental species in offspring size. However, the variation in size across the hybrid zone did not show a smooth cline or a distinct step coinciding with any of the sharp transitions found for behavioural or genetic characters. Variation within hybrid populations was not greater than in "pure" samples of the two species; these data correspond to findings of other studies which showed that this contact between G. laevis and G. victoriana is a "true hybrid zone" with panmictic local populations, not an overlap of the two species.</jats:p> </jats:sec> http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Amphibia-Reptilia Brill

Offspring size variation in a hybrid zone of Australian frogs (Geocrinia laevis complex, Myobatrachinae)

Gollmann, Günter; Gollmann, Birgit
Amphibia-Reptilia , Volume 15 (4): 343 – Jan 1, 1994
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Publisher
Brill
Copyright
© 1994 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0173-5373
eISSN
1568-5381
DOI
10.1163/156853894X00380
Publisher site
See Article on Publisher Site

Abstract

<jats:sec><jats:title>Abstract</jats:title><jats:p>To describe variation in size of offspring across a hybrid zone between the myobatrachine frogs Geocrinia laevis and Geocrinia victoriana, the sizes of tadpoles hatching from egg masses collected in the field were measured. Hatchling size was strongly correlated with diameter of the blastula or gastrula (referred to here as "egg size"). Geocrinia victoriana had bigger offspring than G. laevis. Hybrids were generally intermediate between the two parental species in offspring size. However, the variation in size across the hybrid zone did not show a smooth cline or a distinct step coinciding with any of the sharp transitions found for behavioural or genetic characters. Variation within hybrid populations was not greater than in "pure" samples of the two species; these data correspond to findings of other studies which showed that this contact between G. laevis and G. victoriana is a "true hybrid zone" with panmictic local populations, not an overlap of the two species.</jats:p> </jats:sec>

Journal

Amphibia-Reptilia – Brill

Published: Jan 1, 1994

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