Composition and Distribution of the Cephalopod Fauna in the Eastern Adriatic and Eastern Ionian Sea

Šifner, Svjetlana Krstulović; Lefkaditou, Eugenia; Ungaro, Nicola; Ceriola, Luca; Osmani, Kastriot; Kavadas, Stefanos; Vrgoca, Nedo

doi:10.1560/4lt4-k01w-c9gf-7yk3

Cited by 18 publications

(13 citation statements)

References 14 publications

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“…Illex coindetii has been recorded up to 1100 m of depth (Guerra, 1992), being more abundant on the lower shelf and upper slope, where it has been also found among the main dominant species of cephalopod assemblages (Sánchez et al, 1998a;Quetglas et al, 2000;Krstulovic-Sifner et al, 2005;Lefkaditou, 2006). Variations in its bathymetric distribution have been observed between different geographic regions but also in a certain region depending on season and life stage (Sánchez et al, 1998b).…”

Section: Introductionmentioning

confidence: 99%

Influences of environmental variability on the population structure and distribution patterns of the short-fin squid Illex coindetii (Cephalopoda: Ommastrephidae) in the Eastern Ionian Sea

et al. 2008

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Illex coindetii is the most common benthic ommastrephid squid exploited by bottom trawl in the Mediterranean Sea. A recent study examining trends in population metrics based on data from the International Bottom Trawl Surveys in the Mediterranean (MEDITS) has shown an increasing trend in average lengths of I. coindetii sampled in the eastern Ionian Sea, suggesting that this is possibly due to the thermoaline circulation reversal and the warming of the entire water column in this area after 1998 because of the Eastern Mediterranean Transient (EMT). In this study, spatial and inter-annual variability of the population structure and the distribution patterns of I. coindetii in the eastern Ionian is investigated in relation to environmental characteristics. Datasets used include demographical and biological data derived from the MEDITS surveys carried out during the summers of 1994-2006 and environmental parameters obtained through CTD sampling and remotely sensed imagery. Analyses performed include descriptive methods like the length frequency analyses and GIS mapping of standardized densities, as well as habitat modelling of presence data for different life stages of I. coindetii (based on generalized additive models and maximum entropy). An increasing trend in frequency of occurrence and density indices for all life stages has been detected during the studied period, being more evident after 1999. At the same time a temporal shift in seasonal maturation was also evidenced, coinciding to the warming of eastern Ionian waters due to EMT effects. Spawning aggregations occurred steadily on the upper slope of the relatively more protected area west of the Kefalonia Island, extending also over the lower shelf of the Patraikos Gulf in summers with lower upwelling activity. The inter-annual variability observed in the location of main recruitment areas could be related to mechanisms affecting post-hatching dispersal during late winter and spring, when maximum intensity of surface mesoscale activity has been observed. Depth was found the principal variable associated with the distribution of I. coindetii in the study area. Anomalies of surface temperature and chlorophyll-a, as well as distances from coast and thermal fronts were also selected for the final set of response variables without, however, showing any clear trend particularly in the case of recruits. The results of this study highlight the importance of a more comprehensive study of both environmental processes and I.

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Section: Introductionmentioning

confidence: 99%

Influences of environmental variability on the population structure and distribution patterns of the short-fin squid Illex coindetii (Cephalopoda: Ommastrephidae) in the Eastern Ionian Sea

et al. 2008

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“…Although in case of the deep-sea trawling it is difficult to assess the exact depth at which specimens were caught, the fact is that in the Adriatic Sea this species was never found neither in coastal areas nor at depths bellow 500 m (Krstulović Šifner et al, 2005;Krstulović Šifner et al, 2011). Previously only one specimen of the species was registered in the Adriatic Sea, without precise locality being indicated (Gamu lin -Brida & Ilijan ić, 1965;Gamu lin-Brida & Ilijanić, 1972), while its beaks were found in the stomach contents of the large predators in the South Adriatic Sea (Bello, 1990(Bello, , 1996.…”

Section: Discussionmentioning

confidence: 99%

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Šifner¹,

Bošnjak²,

Petrić³

2018

Turk. J. Fish. Aquat. Sci.

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Specimens of Ancistroteuthis lichtensteinii were collected in the South Adriatic Pit during the deep -sea research performed in the South Adriatic Pit in 2010. They were caught at depths between 690 and 1.200 m with pelagic and bottom trawls. A total of 39 individuals were collected. The mantle length ranged from 13 to 129 mm, and body weight from 0.2 to 63.1 g. The length-weight relationship revealed a negative allometric growth. M orphological characteristics of upper and lower beak showed a positive correlation with mantle length and body weight. When compared to the body length, t he highest growth rate in the sample was determined for the crest length and the lowest rate for the rostrum length, both for upper and lower beak. Statolith microstructure analysis showed that individual age ranged between 72 and 178 days and average age of the analysed specimens was 108 days. This study proved that juveniles of this rare species inhabit depths of the South Adriat ic Sea. The general lack of information on A. lichtensteinii is not a result of its absence in the area but of the scarcity of investigations in depths of the South Adriatic Pit and use of inadequate sampling techniques for the pelagic species.

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“…It is associated with sandy and muddy bottoms and it mostly occurs on the shelf break and upper slope, not ascending to the surface or approaching the shore. Its populations have been considered as indicative of the cephalopod community at these depths, in the south-eastern Atlantic (ROELEVELD et al, 1992), the Balearic Sea (QUETGLAS et al, 2000), the north Tyrrhenian (SANCHEZ et al, 1998), the south-eastern Adriatic (KRSTULOVIC-SIFNER et al, 2005) and the eastern Ionian Sea (LEFKADITOU et al, 2001). Mature individuals are found all year round, with maximum incidence of mature females from mid-spring to early autumn (GONZALEZ et al, 1994;RELINI et al, 1999;ROBIN et al, 2002).…”

Section: Todaropsis Eblanae (Ball 1841)mentioning

confidence: 99%

“…S. elegans is a sublittoral species of sandy and sandy-muddy bottoms of the continental shelf and the upper slope, being among the dominant cephalopod species on the upper shelf (SANCHEZ et al 1998;KRSTULOVIC-SIFNER et al, 2005;LEFKADITOU, 2007). In the Sea of Marmara, S. elegans has also been recorded in brackish waters (18-25 psu) (UNSAL et al, 1999), which indicates a high degree of salinity tolerance.…”

Section: Sepia Elegans (Blainville 1827)mentioning

confidence: 99%

Molluscan species of minor commercial interest in Hellenic seas: Distribution, exploitation and conservation status

et al. 2008

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Recognising the need for data gathering at taxon level besides the taxa of commercial interest and those listed as endangered in the Protocol of the Barcelona Convention, but still exploited by Man, the present study attempts to gather and review the available scientific information on molluscs of minor commercial importance in order to assist in the adequate management and protection of their populations. Forty one species (18 gastropods, 13 bivalves, and 10 cephalopods) of minor commercial interest are treated in the present work with details on their biogeographic distribution, exploitation and conservation status in Hellas. Apart from a few species (e.g., Pinna nobilis, Lithophaga lithophaga, Donacilla cornea), and these only at a local scale, there is no population assessment in Hellenic seas. The existing legislation for eleven of these species is not enforced in practice, and seems insufficient to guarantee their conservation. It is suggested that targeted collection data, networked nationally and internationally, should be promoted so this invaluable source of biodiversity information can be accessed for conservation and planning purposes.

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Composition and Distribution of the Cephalopod Fauna in the Eastern Adriatic and Eastern Ionian Sea

Cited by 18 publications

References 14 publications

Influences of environmental variability on the population structure and distribution patterns of the short-fin squid Illex coindetii (Cephalopoda: Ommastrephidae) in the Eastern Ionian Sea

Influences of environmental variability on the population structure and distribution patterns of the short-fin squid Illex coindetii (Cephalopoda: Ommastrephidae) in the Eastern Ionian Sea

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Molluscan species of minor commercial interest in Hellenic seas: Distribution, exploitation and conservation status

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