Amphibian decline and their protection in Croatia

Poljak, Martina (2010) Amphibian decline and their protection in Croatia. Bachelor's thesis, Faculty of Science > Department of Biology.

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Abstract

Amphibians belong to one of the most critically endangered group of animals on planet Earth. About one third of the species are seriously in danger and it is possible that they will not survive this century. In the last 30 years about 200 species have disappeared and some of them were unique. A hard work, time and money were invested in the research of causes of amphibian decline but there are still more questions then the answers. It seems that we need long and systematic monitoring over populations of amphibians so they can provide some results. Local factors that cause disappearance of amphibians are: changed or lost habitat, its fragmentation, import of the predators and competitors, pollution and huge exploitation. Global factors are: temperature rising as a consequence of global warming, and other causes such as regional changes in water heights (especially rising frequency of dry periods), soil melioration and variability of rain seasons. There are also acid rains, deforestation and high UV – B radiation. All of these factors can act directly causing death or indirectly causing stress. In Croatia does not exist systematic monitoring over populations of amphibians. We should organise activities of local groups (such as monitoring), who would be under surveillance of scientist. In this way we can get important information about populations that live here. In this moment we can not discuss about amphibian decline because there is no data evidence, but there are some factors of risk.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Mrakovčić, Milorad
Date: 2010
Number of Pages: 17
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 29 Oct 2014 10:42
Last Modified: 29 Oct 2014 10:42
URI: http://digre.pmf.unizg.hr/id/eprint/3215

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