Facultative paedomorphosis and the pattern of intra- and interspecific variation in cranial skeleton: lessons from European newts (Ichthyosaura alpestris and Lissotriton vulgaris)
2014
Тип документа:
Чланак у часопису (Објављена верзија)
,
© Springer-Verlag Berlin Heidelberg 2013
Метаподаци
Приказ свих података о документуАпстракт:
Paedomorphosis, the presence of ancestral larval and juvenile traits
that occur at the descendent adult stage, is an evolutionary phenomenon
that shaped morphological evolution in many vertebrate lineages,
including tailed amphibians. Among salamandrid species, paedomorphic and
metamorphic phenotypes can be observed within single populations
(facultative paedomorphosis). Despite wide interest in facultative
paedomorphosis and polymorphism produced by heterochronic changes
(heterochronic polymorphism), the studies that investigate intraspecific
morphological variation in facultative paedomorphic species are largely
missing. By quantifying the cranium size and development (bone
development and remodeling), we investigated the variation at multiple
levels (i.e., between sexes, populations and species) of two
facultatively paedomorphic European newt species: the alpine and the
smooth newt. The pattern of variation between paedomorphs (individuals
keeping larval traits at the adult stage) and metamorphs (metamorphosed
adult individuals) varied between species and among populations within a
single species. The patterns of variation in size and skull formation
appear to be more uniform in the alpine than in the smooth newt,
indicating that developmental constraints differed between species (more
pronounced in alpine than in smooth newt). Our study shows that the
cranial skeleton provides detailed insight in the pattern of variation
and divergence in heterochronic polymorphism within and between species
and open new questions related to heterochronic polymorphism and
evolution of cranial skeleton.
Кључне речи:
European newts; Skull morphology; Development; Heterochronic polymorphismИзвор:
Zoomorphology, 2014, 133, 1, 99-109Финансирање / пројекти:
- Диверзитет водоземаца и гмизаваца Балкана: еволуциони аспекти и конзервација (RS-MESTD-Basic Research (BR or ON)-173043)
DOI: 10.1007/s00435-013-0202-7
ISSN: 0720-213X