Title DINAMIKA POPULACIJE VRSTE Lepidorhombus boscii (Risso, 1810) U JADRANSKOM MORU Title (english) POPULATION DYNAMICS OF THE Lepidorhombus boscii (Risso, 1810) IN THE ADRIATIC SEA Author Nika Ugrin Mentor Svjetlana Krstulović Šifner (mentor)Mentor Igor Isajlović (komentor)Committee member Nedo Vrgoč (predsjednik povjerenstva)Committee member Mate Šantić (član povjerenstva)Committee member Vedrana Nerlović (član povjerenstva)Granter University of Split Defense date and country 2024, Croatia Scientific / art field, BIOTECHNICAL SCIENCES Universal decimal classificationUDC ) 502/504 - Environmental science. Conservation of natural resources. Threats to the environment and protection against them Abstract U ovom radu predstavljeni su rezultati istraživanja vrste patarače crnopjege, Lepidorhombus boscii (Risso, 1810), na području sjevernog i srednjeg Jadrana. Dio uzoraka je prikupljen tijekom višegodišnjih istraživanja ekspedicije MEDITS u zoni GSA 17 (N=27720), a dio tijekom jednogodišnjeg mjesečnog uzorkovanja na području srednjeg Jadrana (N= 1070). Rezultati istraživanja pokazuju da L. boscii u zoni GSA 17 obitava na dubinama od 61 do 659 m. Omjer spolova je bio 1:0,89 (ž/m). Biometrijska analiza je pokazala statistički značajne razlike u odnosu dužine prsne peraje i standardne dužine tijela, u broju kralježaka između mužjaka i ženki te u broju šipčica trbušne peraje. Dužinsko-maseni odnos ukupnog uzorka je pokazao pozitivno alometrijski rast (b=3,29). Prosječna vrijednost indeksa kondicije ukupnog uzorka iznosi 0,681. Rast populacije je opisan von Bertalanffyevom jednadžbom rasta (L∞=39,63 cm; k=0,10; t0=-4,09). Starost jedinki je određena očitavanjem zona prirasta sagitalnih otolita. U uzorku su najbrojnije bile jedinke starosti dvije i tri godine. Najstarija analizirana ženka je imala 10 godina, a najstariji mužjak 6 godina. Utvrđeno je da je ribolovna smrtnost (F=0,15) veća od prirodne smrtnosti (M=0,11). Kemijskom analizom je detektiran veliki broj metala i organskih spojeva u otolitima. Rendgenskom difrakcijom je određena kristalna struktura otolita; otoliti pravilne morfologije građeni su od aragonita, a oni nepravilne morfologije od kalcita. Intenzitet hranjenja je bio najveći u proljeće, a najzastupljeniji plijen su rakovi, glavonošci i ribe. Ženke postaju spolno zrele pri dužini od Lt50%=19,2 cm, odnosno pri manjim dužinama tijela u odnosu na mužjake (Lt50%=20,3 cm). Najveće vrijednosti gonadosomatskog indeksa za ženke zabilježene su u ožujku, a za mužjake u studenom. Prosječni fekunditet ženki iznosi 87461 oocita. L. boscii u Jadranskom moru najintenzivnije se razmnožava od studenog do ožujka.
Abstract (english) This paper presents the results of research on the species of the four-spot megrim, Lepidorhombus boscii (Risso, 1810), in the area of the northern and central Adriatic. Part of the samples were collected during multi-year investigations of the MEDITS expedition in the GSA 17 zone (N=27720), and part during one-year monthly sampling in the area of the central Adriatic (N=1070). The results of the research show that L. boscii lives in the GSA 17 zone at depths from 61 to 659 m. The sex ratio was 1:0,89 (f/m). Biometric analysis showed that there are statistically significant differences in the ratio of the length of the pectoral fin to the standard length of the body, in the number of vertebrae between males and females, and in the number of rays of the ventral fin. The length-weight relationship of the total sample showed positive allometric growth (b=3,29). The average value of the condition factor of the total sample was 0,681. Population growth is described by the von Bertalanffy growth equation (L∞=39,63 cm; k=0,10; t0=-4,09). Age was determined by reading the growth zones of the sagittal otoliths. The most numerous in the sample were specimens aged two and three years. The oldest female was 10 years old and the oldest male was 6 years old. Fishing mortality (F=0,15) of this species were higher than natural mortality values (M=0,11). Large number of metals and organic compounds were detected by chemical analysis of otoliths. The crystal structure of the otolith was determined by the X-ray diffraction; otoliths of regular morphology are composed of aragonite and those with irregular morphology of calcite. The intensity of feeding was the highest in spring, and the most abundant prey are crustaceans, cephalopods and fish. Females reached maturity (Lt=19,2 cm) at smaller lengths than males (Lt=20,3 cm). The highest values of the gonadosomatic index for females were recorded in March, and for males in November. The average fecundity of females is 87461 oocytes. L. boscii reproduces most intensively in the Adriatic Sea from November to March.
Keywords
biometrija
ishrana
Jadransko more
Lepidorhombus boscii
rast
razmnožavanje
smrtnost
starost
Keywords (english)
Adriatic Sea
age
biometrics
diet
growth
Lepidorhombus boscii
mortality
reproduction
Language croatian URN:NBN urn:nbn:hr:226:411041 Promotion 2024-01-09 Study programme Title: Obtaining a doctorate of science outside of doctoral studies Type of resource Text File origin Born digital Access conditions Open access Terms of use Created on 2024-04-09 10:03:18
