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Title:Vpliv ribištva na vedenje in telesne poškodbe velike pliskavke (Tursiops truncatus) v Tržaškem zalivu
Authors:Hozner, Janja (Author)
Klenovšek, Tina (Mentor) More about this mentor... New window
Genov, Tilen (Co-mentor)
Files:.pdf MAG_Hozner_Janja_2020.pdf (5,96 MB)
MD5: CBE209F1E6AD98EADD05CB682C84B452
 
Language:Slovenian
Work type:Master's thesis/paper (mb22)
Typology:2.09 - Master's Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:Velika pliskavka (Tursiops truncatus) je ena izmed bolj preučevanih vrst kitov na svetu in edina stalno živeča vrsta kitov v severnem delu Jadranskega morja in s tem tudi v slovenskem morju. V Sloveniji se podatke o stanju populacije velike pliskavke zbira od leta 2002. Interakcije in konflikti med delfini in ribiči v Sredozemskem morju so zelo pogost pojav. Te so lahko za delfine kot tudi ribiče pozitivne, negativne ali nevtralne. Raziskava je potekala znotraj Tržaškega zaliva (slovenske teritorialne vode, del hrvaških in italijanskih teritorialnih vod) od leta 2002 do vključno leta 2015. Preučevali smo interakcije med velikimi pliskavkami in različnimi tipi ribiških ladij (s pridneno in pelagično vlečno mrežo). Prav tako smo znotraj naloge opravili analizo količine ulova slovenskega ribištva. Ugotovili smo, da se količina skupnega ulova pelagičnih in pridnenih vlečnih mrež skozi leta zmanjšuje s statistično značilnim trendom. Interakcije delfinov z ribiškimi mrežami kot del njihove prehranjevalne strategije je dobro poznano vedenje. Izmed 455 opažanj smo v 68 (14,9 %) opazili interakcijo delfinov z ribiško ladjo. V 38,2 % so delfini sledili pelagičnim vlečnim mrežam in 62,8 % pridnenim vlečnim mrežam. Kljub temu da količina skupnega ulova z leti pada, se trend opažanj interakcij med delfini in ribiškimi ladjami ne zmanjšuje. Velikost skupin delfinov, ki so sledili vlečnim mrežam, je bila večja kot velikost skupin delfinov brez vključene interakcije. Znotraj opaženih skupin smo opazili tudi prisotnost mladičev. Statistično pomembnih razlik med prisotnostjo mladičev, ko so bile skupine v interakciji ali brez nje, nismo opazili. Da zapleti v ribške mreže predstavljajo hudo grožnjo različnim vrstam kitov, kažejo številne študije. Znotraj naše raziskave smo ugotovili, da ribolovne aktivnosti vplivajo na telesne poškodbe velike pliskavke tudi znotraj Tržaškega zaliva, a večina prisotnih telesnih poškodb znotraj opazovane populacije pripada agresivnim medsebojnim interakcijam.
Keywords:velika pliskavka, Tursiops truncatus, delfini, ribištvo, interakcije, telesne poškodbe, vedenje, Tržaški zaliv
Year of publishing:2020
Publisher:[J. Hozner]
Source:Maribor
UDC:599.537:616-001(043.2)
COBISS_ID:21947395 New window
NUK URN:URN:SI:UM:DK:YNB2782Z
Views:273
Downloads:29
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:FNM
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:27.03.2020

Secondary language

Language:English
Title:Impact of fisheries on the behaviour and body injuries of bottlenose dolphins (Tursiops truncatus) in the gulf of trieste
Abstract:Bottlenose dolphin (Tursiops truncatus) is one of the most studied species of cetaceans in the world and the only permanently living species of cetaceans in the northern part of the Adriatic Sea and thus in the Slovenian Sea. Data on the population of bottlenose dolphin have been collected in Slovenia since 2002. Interactions and conflicts between dolphins and fishermen in the Mediterranean are a very common occurrence. These can be positive, negative or neutral for dolphins as well as fishermen. The survey was conducted within the Gulf of Trieste (Slovenian territorial waters, part of the Croatian and Italian territorial waters) from 2002 to 2015. Within the scope of the task, we also analyzed the catch volume of Slovenian fisheries. We found that the total catch of pelagic pair trawlers and bottom trawlers has been decreasing over the years with a statistically significant trend. Dolphin interactions with fishing nets as part of their dietary strategy are well known behaviors. Of the 455 observations, an interaction of dolphins with a fishing vessel was observed in 68 (14,9 %). In 38,2 %, dolphins followed pelagic pair trawlers and 62,8 % bottom trawlers. Although the amount of total catches has been declining over the years, the trend of observations of interactions between dolphins and fisheries has not decreased. The size of the dolphin groups following the trawls was larger than the size of the dolphin groups with no interaction involved. The presence of calves was also observed within the observed groups. No statistically significant differences were observed between the presence of calves when the groups were interacting with or without it. Numerous studies indicate that entanglements in fish nets represent a serious threat to different species of whales. Within our research, we found that fishing activities affect on injuries of bottlenose dolphins also within the Gulf of Trieste, but most of the injuries occurring within the observed population belong to aggressive interactions between dolphins.
Keywords:bottlenose dolphin, Tursiops truncatus, dolphins, fisheries, interactions, body injuries, behaviour, Gulf of Trieste


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