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Title:Biometrija, spolna dvoličnost in razmnoževalna biologija izbranih vrst rakovic (crustacea: decapoda) v severnem jadranu
Authors:ID Rezaei, Mona (Author)
ID Lipej, Lovrenc (Mentor) More about this mentor... New window
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Language:Slovenian
Work type:Doctoral dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:Povzetek Raziskovana je bila distribucija in struktura populacije 4 vrst rakovic (Decapoda: Crustacea), Medorippe lanata, Goneplax rhomboides, Liocarcinus depurator in Liocarcinus vernalis, glede morebitnih učinkov na ribištvo in uporabo vlečnih mrež na njihovo populacijo. Raziskava je bila narejena v severnem Jadranu. Kot del ribiške odprave, je bilo decembra 2013 v vodah severnega Jadrana ulovljenih skupaj 1100 primerkov, vseh 4 vrst. Rakovice so bile zbrane iz 32 vzorčnih postaj. Globina voda se je gibala med 10,6 m in 84 m. Izvedene so bile biometrične meritve ter prešteto je bilo število jajčec. (L. depurator in L. vernalis). Razmerje samic in samcev (L. depurator, L. vernalis, M. lanata in G. rhomboides) je bilo sledeče - 1:1.5, 1:2, 1:0.8 in 1:57. Med vrstama L. depurator in L. vernalis ni bilo pomembnejših razlik v številu jajčec. Nobene pomembne povezave ni bilo ugotovljene med zunanjim oklepom (širina / dolžina) in številom jajčec teh rakovic. G. rhomboides ima očitno večji Fultonov pogojni indeks kot ostale vrste. Povezava med globino vode in merjenimi biometričnimi parametri so dale šibke, vendar pomembne rezultate, v glavnem pri samcih L. Vernalis. Rakovic obeh spolov je bilo obilo na vseh proučevanih globinah in ni bilo pomembnejše povezave med globino morja in številom rakovic. Samo v primeru (M. Lanata) je bila razporeditev le teh bolj izrazita na globinah manjših od 50 metrov, ne glede na spol. Samci L.vernalis so bili precej večji od samic, kar kaže na velikost spolne dvoličnosti. Ta velikost dvoličnosti je bila opažena pri M. lanata na stopnji zunanjega oklepa, brez večje razlike v mokri teži. Vseeno pri tej vrsti so bile samice večje, pri merjenju zunanjega oklepa, kot samci.
Keywords:Medorippe lanata, Goneplax rhomboides, Liocarcinus depurator, Liocarcinus vernalis, Biometrija, Severno Jadransko morje
Place of publishing:[Maribor
Publisher:M. Rezaei]
Year of publishing:2020
PID:20.500.12556/DKUM-73795 New window
UDC:595.384.2(262.3-17)(043.3)
COBISS.SI-ID:21316355 New window
NUK URN:URN:SI:UM:DK:W7DSWKTI
Publication date in DKUM:03.08.2020
Views:1341
Downloads:0
Metadata:XML DC-XML DC-RDF
Categories:FNM
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Licences

License:CC BY-ND 4.0, Creative Commons Attribution-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nd/4.0/
Description:Under the NoDerivatives Creative Commons license one can take a work released under this license and re-distribute it, but it cannot be shared with others in adapted form, and credit must be provided to the author.
Licensing start date:14.06.2019

Secondary language

Language:English
Title:Biometry, sexual dimorphism and reproductive biology of selected crabs (crustacea: decapoda) in the northern adriatic sea
Abstract:The distribution and population structure of four species of crabs (Decapoda: Crustacea), Medorippe lanata, Goneplax rhomboides, Liocarcinus depurator and Liocarcinus vernalis were investigated for the possible effect of fishery and trawling activities on their populations. The study was performed in the Northern Adriatic Sea. A total of 1100 specimens of four species were caught from waters off the northern Adriatic Sea in December 2013 as a part of fishery expedition. All crabs were collected from 32 sampling stations. The water depth ranged from 10.6 to 84 m. Biometric measurements were performed and the numbers of eggs were counted in L. depurator and L. vernalis. The ratio of female to male (F/M) in L. depurator, L. vernalis, M. lanata and G. rhomboides were 1:1.5, 1:2, 1:0.8 and 1:57, respectively. No significant difference was found in the number of eggs between the two species L. depurator and L. vernalis. No significant correlation was found between carapace width/length and number of eggs in these crabs. G. rhomboides was shown to have obviously greater Fulton’s condition index than other species. Correlation between water depth and all the measured biometric parameters gave weak but significant results mainly in females of L. vernalis. Crabs of both sexes were abundant at all studied depths and no significant correlation was found between depth and the number of crabs. Only in case of M. lanata, the distribution was more pronounced at depths lower than 50 m regardless of sex. Males of L. vernalis were significantly larger than females which indicate sexual size dimorphism. This size dimorphism was also observed in M. lanata at carapace level without significant difference in wet weight. However, in this species the females were larger in carapace dimensions than males.
Keywords:Medorippe lanata, Goneplax rhomboides, Liocarcinus depurator, Liocarcinus vernalis, Biometry, Northern Adriatic Sea


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