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Title:VARSTVENA BIOLOGIJA GALAPAŠKE ŽELVE GEOCHELONE ELEPHANTOPUS
Authors:ID Hauptman, Nika (Author)
ID Janžekovič, Franc (Mentor) More about this mentor... New window
Files:.pdf UNI_Hauptman_Nika_2009.pdf (16,32 MB)
MD5: 9D0BCF2C254987904DB9483B1F9102BD
PID: 20.500.12556/dkum/586bbcfd-f5aa-4066-b0c1-52aae98a017d
 
Language:Slovenian
Work type:Undergraduate thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:Osamljeni oceanski otoki so geološko mlajšega nastanka in nikoli niso bili povezani s celino, zato imajo svojevrstno živalstvo in tudi rastlinstvo. Ena izmed najbolj zanimivih in pomembnih živali tega otočja so orjaške galapaške želve (Geochelone spp). Populacija orjaških galapaških želv je bila zaradi prvih pomorščakov, neavtohtonih živali in različnih bolezni močno zmanjšana. Nekatere podvrste so bile celo iztrebljene. Leta 1959 so v Ekvadorju ustanovili dve organizaciji, ki sta začeli aktivno prizadevanje za ohranitev biološke raznolikosti na otočju, in sicer Charles Darwin Fundation (CDF) in Galapaški nacionalni park (GNP). Že v 60. letih je CDF ustanovila Raziskovalno postajo Charlesa Darwina (CHRS), katere glavna naloga je ohranjanje samoniklega rastlinstva in živalstva na otočju. Znanstveniki in prostovoljci največ pozornosti namenijo vzreji želv v ujetništvu. Skozi leta izvajanja programa vzreje želv v ujetništvu so prišli do spoznanja, da obstaja temperaturna spolna determinacija tudi pri galapaških orjakinjah. Znanstveniki na raziskovalni postaji so to odkritje sprejeli kot prednost za prihodnost in na ta način umetno usmerjali razvoj v več samic kot samcev, kar je povečalo produkcijo jajc in skrajšalo čas za ustvarjanje večje populacije želv. Danes je populacija želv stabilna. Njihovo število je na posameznih otokih nehalo upadati, ponekod se je celo povečalo.
Keywords:Galapagos, orjaška galapaška želva (Geochelone elephantopus) (Ernst, 1989), fundacija Charlesa Darwina, raziskovalna postaja Charlesa Darwina, vzreja želv v ujetništvu.
Place of publishing:Maribor
Publisher:[N. Hauptman]
Year of publishing:2009
PID:20.500.12556/DKUM-12292 New window
UDC:57/59(043.2)
COBISS.SI-ID:17243144 New window
NUK URN:URN:SI:UM:DK:1PRC5LPV
Publication date in DKUM:25.11.2009
Views:4872
Downloads:334
Metadata:XML DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:CONSERVATION BIOLOGY OF THE GALAPAGOS GIANT TORTOISE GEOCHELONE ELEPHANTOPUS
Abstract:Isolated ocean islands are of geologically younger formation and have never been connected to the continent which is the reason for their unique vegetation and animals. One of most interesting animals of this island is Galapagos tortoise (Geochelone spp.). The population of Galapagos giant turtles was greatly reduced because of the first seamen, autochthon animals and various diseases. Some subspecies even became extinct. In 1959 two organizations which take an active part in maintaining biological diversity on islands were founded; Charles Darwin Foundation (CDF) and Galapagos National Park. Yet in sixties, the CDF established Charles Darwin Research Station (CHRS) which is primarily concerned with preserving native flora and fauna of the islands. The scientists and volunteers spend most of their time breeding tortoises in captivity. Over the years of implementation of the tortoise breeding program they recognized that Galapagos giant tortoise also has temperature-dependent sex determination. The scientists at the research station used that discovery as an advantage that enabled them to determine the feminine gender of certain artificially incubated eggs. It increased the production of eggs which led to larger population of tortoise in less time. Today the population of tortoise is stable. Their number stopped declining or it even increased on some islands. The Galapagos tortoise ancestors, probably washed out to sea from the South America shore, drifted on their backs to Galapagos Islands- tortoises have been recorded living for months in this manner.
Keywords:Galapagos, Galapagos giant turtle (Geochelone elephantopus) (Ernst, 1989) Charles Darwin Foundation, Charles Darwin Research Station, breeding tortoises in captivity


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