Naslov
Sex ratios of juvenile loggerhead sea turtles, Caretta caretta, in the eastern Adriatic Sea and implications for conservation

Autori
Lazar, Bojan ; Lacković, Gordana ; Tvrtković, Nikola

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
8. hrvatski biološki kongres s međunarodnim sudjelovanjem - Zbornik sažetaka (8th Croatian Biological Congress with International Participation - Proceeding of abstracts) / Besendorfer, Višnja ; Kopjar, Nevenka - Zagreb : Hrvatsko biološko društvo, 2003, 393-394

ISBN
953-6241-05-6

Skup
8. hrvatski biološki kongres s međunarodnim sudjelovanjem (8th Croatian Biological Congress with International Participation)

Mjesto i datum
Zagreb, Hrvatska, 27.09.2003. - 02.10.2003

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
sea turtles; sex ratios; migrations; conservation

Sažetak
We examined sexes of 33 juvenile loggerheads by morphological and histological analysis of gonads Visual examination of gonads resulted in a 1:1 ratio, while histology gave a slightly male-biased sex ratio, but not significantly different from a 1:1 ratio (chi-sq.= 2.00, p = 1.157). Our results are in discordance with the strong female-biased loggerhead hatchlings production on the Mediterranean nesting beaches. However, they confirm results on male-skewed sex ratios of juvenile loggerheads from central Mediterranean, supporting the theory on male-biased immigration of juveniles from north-western Atlantic populations into the Mediterranean. If we consider that about 50% of pelagic juveniles in the Mediterranean originate from NW Atlantic, most of them being males, such male-skewed immigration is likely to buffer the original female-bias of the Mediterranean juvenile populations. The sex ratio in our study suggests that the male-biased dispersal of NW Atlantic juveniles reaches the Adriatic Sea, classifying these waters as a habitat shared by juveniles belonging to both Mediterranean and NW Atlantic populations. As in juvenile loggerheads males seem to disperse farther than females, considering a higher reproductive value of females, human impact, such as fishery, would affect more populations from closer nesting sites than the distant ones. Therefore, high by-catch in Adriatic fisheries would have the most detrimental effect for juvenile loggerheads from the regional nesting grounds.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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