Discovery and evolutionary affinities of five new species of amphibians from Bangladesh

Show full item record



Permalink

http://urn.fi/URN:ISBN:978-951-51-2106-6
Title: Discovery and evolutionary affinities of five new species of amphibians from Bangladesh
Author: Howlader, Mohammad Sajid Ali
Other contributor: Helsingin yliopisto, bio- ja ympäristötieteellinen tiedekunta, biotieteiden laitos
Helsingfors universitet, bio- och miljövetenskapliga fakulteten, biovetenskapliga institutionen
University of Helsinki, Faculty of Biological and Environmental Sciences, Department of Biosciences, Ecological Genetics Research Unit
Publisher: Helsingin yliopisto
Date: 2016-05-13
Language: en
URI: http://urn.fi/URN:ISBN:978-951-51-2106-6
http://hdl.handle.net/10138/161276
Thesis level: Doctoral dissertation (article-based)
Abstract: Amphibians are the most threatened class of vertebrates. About 48% of the known amphibian species are threatened by extinction, and many species still remain undescribed, especially from tropical and sub-tropical countries such as Bangladesh. In contrast to India and Sri Lanka, amphibian diversity in Bangladesh is poorly known, and little effort has been put towards documenting the species diversity and resolving evolutionary affinities among amphibian taxa in this country. Hence, the actual diversity of amphibians in Bangladesh remains unknown. The aim of this dissertation work was to improve our knowledge of amphibian diversity in Bangladesh by identifying and describing new amphibian species and investigating their evolutionary relationships with closely related taxa. I used morphological and molecular phylogenetic methods to identify and describe one new genus and five new species from different genera. In addition to using traditional morphological comparisons, I also utilized mitochondrial gene fragments to estimate phylogenetic affinities among the studied taxa, with Maximum-likelihood and Bayesian methods. The first two chapters of the thesis focus on the amphibian genera Fejervarya and Zakerana, the latter which was previously embedded within Fejervarya. These chapters also include descriptions of two new species Fejervarya asmati sp. nov. (now Zakerana asmati), as well as Fejervarya burigangaensis sp. nov. , respectively. In the third chapter, a new species (Zakerana dhaka sp. nov.) is described from the urban core of Dhaka, the capital of Bangladesh and one of the most densely populated mega cities in the world. In the fourth chapter, I describe Euphlyctis kalasgramensis sp. nov., which was earlier recognized as E. cyanophlyctis, and show that it is genetically highly divergent from the E. cyanophlyctis described from southern India. In the last and fifth chapter, I describe Microhyla nilphamariensis sp. nov. as a new species. It is a member of a highly genetically heterogeneous group of frogs that have been recognized as M. ornata for the past 173 years. In general, the results of the studies included in this dissertation advance our understanding of amphibian diversity in Bangladesh and adjacent regions, and show that discovery and description of new amphibian species from this region is still fairly easy. Consequently, it seems likely that more thorough sampling and further investigations in this region can uncover additional new amphibian species to science. Such studies, together with the discoveries described in this thesis, should also provide useful information for understanding and conserving the amphibian biodiversity in this poorly studied region.
Subject: ecology and Evolutionary Biology
Rights: Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty.


Files in this item

Total number of downloads: Loading...

Files Size Format View
discover.pdf 2.683Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record