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CNAA / Theses / 2008 / June /

Biological and ecological characteristics and behaviour of species Triturus cristatus Laur. (Amphibia, Caudata) in Central part of Codri


Author: Liliana Jalbă
Degree:doctor of biology
Speciality: 03.00.08 - Zoology
Year:2008
Scientific adviser: Tudor Cozari
doctor habilitat, professor, Institute of Zoology
Scientific consultant: Ion Toderaş
doctor habilitat, professor, Institute of Zoology
Institution:
Scientific council:

Status

The thesis was presented on the 27 June, 2008
Approved by NCAA on the 18 September, 2008

Abstract

Adobe PDF document – 1.70 Mb / in romanian

Thesis

CZU 597.9:591.5(478)

Adobe PDF document 4.67 Mb / in romanian
150 pages

Keywords

Triturus cristatus, spatial distribution, biometrical indices, sexual dimorphism, conjugal colour, Behaviour of reproduction, embryonal stage, larval stage, fertility, parental investment, successful reproduction.

Summary

This thesis presents an in-depth analysis of the biology, ecology and etology of the species Triturus cristatus. The research investigations have been done in Central part of Codri during the period 2004-2007. In the paper there are analysed the systematization, geographical distribution and morphological structure of Triturus cristatus on some biometrical parameters of the population. Mozaica (Mz) (with 30,0%), Mozaica regulata (MzR) (with 30,0%) and Mozaica hemiregulata (MzhR) (with 20,0%) are the male main chromatic aberration; nevertheless Mozaica regulata (MzR) and Mozaica hemiregulata (MzhR), each one with 29,4% , and Mozaica (Mz) – with 19,6% there are the female predominated chromatic aberration in the investigated population.

The specific character of the reproduction strategy is identified by several important ecological factors such as: the spatial presence and distribution of the water basins for reproduction, the seasonal and diurnal rhythm of the humidity, air and water temperature, the amphibians species’ presence in the repoduction places, the submersible vegetation distribution abundance and character. Hence, the reproduction strategy of this species consists in: the premature and long-term reproduction, the manifestation of care about descendants, the larval populations divergence into few generations under the evolutionary rhythm, the use of an unlike ecological niche than the other amphibians species.

There is established that for Triturus cristatus species the highest parental investment (equal to 38,5%) is a characteristic feature among whole aboriginal amphibians species. This is due to the fact that this species has a long-term period of the ontogenetic development (90 days), conducting a beast of prey way of life (the animal food beeing more energetic than vegetal one) and has reach and readily available nutritive sources in the populated water basins. The high parental investment let Triturus cristatus to obtain also a successful reproduction – about 5%; this successful reproduction being the highest among the aboriginal species of amphibians.

Due to the obtained results, there was developed some effective protection recommendations of Triturus cristatus. The scientific information in this paper can be successfully used during the biology student training, scientific ecologists, forest-guards and coworkers of reserves in them autecological and sinecological researches.