Distribution, diet and relationships of the invasive ctenophore Mnemiopsis leidyi with anchovies and zooplankton, in the northeastern Adriatic Sea

 
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Τμήμα περιοδικού (EL)
2021 (EL)
Distribution, diet and relationships of the invasive ctenophore Mnemiopsis leidyi with anchovies and zooplankton, in the northeastern Adriatic Sea (EN)
DJAKOVAC, TAMARA
TIČINA, VJEKOSLAV
PASARIĆ, ZORAN
JURETIĆ, TEA
BUDIŠA, ANDREA
PALIAGA, PAOLO
MLADINIĆ, MARIJA
LUČIĆ, DAVOR
DADIĆ, VLADO
SUPIĆ, NASTJENJKA
Blooms of invasive ctenophore Mnemiopsis leidyi can have massive consequences on fish stocks and marine food webs. The distribution, abundance and diet of this ctenophore were investigated in the northeastern (NE) Adriatic between 2016 and 2019. The abundance of M. leidyi was determined daily along the coast of Rovinj (Croatia), and its spatial distribution monitored by visual census from research vessels and by pelagic trawl during acoustic surveys in September of each year. Mesozooplankton samples were collected along the western coast of Istria by vertical tows from the bottom to the surface. Spatial distribution and abundance of anchovy (Engraulis encrasicolus) assemblages were determined by geo-referenced hydro-acoustic sampling using a scientific echosounder. Large swarms of M. leidyi covering several km2 were regularly reported between July and November extending up to 25 NM from the western coast of the Istrian peninsula and reaching maximum offshore densities of 270 individuals per m2. The abundance of anchovy in the areas where M. leidyi was present evidently decreased. The content of M. leidyi’s digestive tract and plankton samples consisted both mainly of cladocerans, copepods, pteropods, echinodermata and bivalvia larvae. Results indicate that M. leidyi may accumulate and increase its abundance in the stagnant and trophically rich areas of the northern Adriatic gyres, spreading to the surrounding larger areas with currents. We assume that M. leidyi presence correlates with a decrease in anchovy population due to competition for food (zooplankton). Our findings support the importance of implementing an international monitoring program throughout the Adriatic Sea and demonstrate the ability of current MEDIAS surveys to detect changes in the pelagic ecosystem throughout surveyed areas. (EN)
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
acoustic survey. (EN)
Engraulis encrasicolus (EN)
zooplankton (EN)
Mnemiopsis leidyi (EN)
Adriatic Sea (EN)
Ελληνικό Κέντρο Θαλασσίων Ερευνών (ΕΛΚΕΘΕ)
Mediterranean Marine Science
Mediterranean Marine Science
Αγγλική γλώσσα
2021-12-27
https://ejournals.epublishing.ekt.gr/index.php/hcmr-med-mar-sc/article/view/23305
Hellenic Centre for Marine Research (EN)
1791-6763
1108-393X
Mediterranean Marine Science; Τόμ. 22 Αρ. 4 (2021): Special Issue; 827-842 (EL)
Mediterranean Marine Science; Vol. 22 No. 4 (2021): Special Issue; 827-842 (EN)
Copyright (c) 2021 Mediterranean Marine Science (EN)



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