Spatiotemporal Density and Ecology of Batoids (Elasmobranchii) Along a Turkish Shelf-upper Slope of the Mediterranean Sea During Years 2009–2015

Mutlu, Erhan; Deval, Mehmet Cengiz; Meo, Ilaria de; Saygu, İsmet; Miglietta, Claudia

doi:10.1007/s41208-021-00391-4

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…An almost synchronous model of the spatial distribution of biomass and abundance of thornback rays was found in the autumn of 2020. A recent study of batoid assemblages along the Turkish Mediterranean coast showed a positive correlation with bottom depth, near-bottom chlorophyll-a, and the finest bioseston and a negative correlation with Secchi disk depth and water salinity [72]. Some connections with the bottom megafauna distribution were considered in this study, based on the feeding characteristics of the batoid species.…”

Section: Discussionmentioning

confidence: 88%

Biological Parameters and Biomass and Abundance Indices of Two Demersal Species, Turbot (Scophthalmus maximus) and Thornback Ray (Raja clavata), Estimated by a Trawl Survey in Western Black Sea

Tserkova

Mihneva

Petrova-Pavlova

2023

Fishes

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In this study, we determined the biological characteristics and indices of abundance and biomass of two demersal species, turbot and thornback ray, through a scientific trawl survey of Bulgarian Black Sea waters in the autumn of 2020. Turbot is among the most valuable fish species in the Black Sea, and thornback ray is a sensitive cartilaginous species with a significantly declining abundance throughout the Mediterranean region. The stock biomass of turbot was estimated at 1467.6 tons, with a relative abundance of 896,922 individuals, and those of the thornback ray were 1187.9 tons and 519,606 individuals, respectively. Mean turbot abundance, interpolated into 0.5° latitude/longitude grid cells, ranged between 52 and 120 ind·km−2, with a mean biomass of 78.26–238.31 kg·km−2, and for the thornback ray, these indices were within the limits of 0–107 ind·km−2 and 0–219 kg·km−2. The distribution of the different length classes of the two fish species by depth layer was analyzed. Length–weight relationships were estimated based on combined samples of both sexes and separately for female and male individuals, allowing a better understanding of growth patterns.

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Section: Discussionmentioning

confidence: 88%

Biological Parameters and Biomass and Abundance Indices of Two Demersal Species, Turbot (Scophthalmus maximus) and Thornback Ray (Raja clavata), Estimated by a Trawl Survey in Western Black Sea

Tserkova

Mihneva

Petrova-Pavlova

2023

Fishes

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“…These findings, sporadic and geographically restricted, have been considered not well documented, and hence the occurrence of these species has been regarded as doubtful [23]. Apart from Egypt and Syria, none of these species have been retrieved in recent studies, even in other close areas of the Eastern Mediterranean basin (e.g., Greece [27]; Turkey [28]; or in the central and Western Mediterranean basins [20,23,[29][30][31][32][33][34][35]).…”

Section: Introductionmentioning

confidence: 99%

I Like This New Me: Unravelling Population Structure of Mediterranean Electric Rays and Taxonomic Uncertainties within Torpediniformes

Melis,

Di Crescenzo,

Cariani

et al. 2023

Animals

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The present study focused on the three species of electric rays known to occur in the Mediterranean Sea: Torpedo torpedo, Torpedo marmorata and Tetronarce nobiliana. Correct identification of specimens is needed to properly assess the impact of fisheries on populations and species. Unfortunately, torpedoes share high morphological similarities, boosting episodes of field misidentification. In this context, genetic data was used (1) to identify specimens caught during fishing operations, (2) to measure the diversity among and within these species, and (3) to shed light on the possible occurrence of additional hidden species in the investigated area. New and already published sequences of COI and NADH2 mitochondrial genes were analyzed, both at a small scale along the Sardinian coasts (Western Mediterranean) and at a large scale in the whole Mediterranean Sea. High levels of genetic diversity were found in Sardinian populations, being significantly different from other areas of the Eastern Mediterranean Sea due to the biotic and abiotic factors here discussed. Sardinian torpedoes can hence be indicated as priority populations/areas to be protected within the Mediterranean Sea. Moreover, sequence data confirmed that only the three species occur in the investigated area. The application of several ‘species-delimitation’ methods found evidence of cryptic species in the three species outside the Mediterranean Sea, as well as in other genera/families, suggesting the urgent need for future studies and a comprehensive revision of the order Torpediniformes for its effective conservation.

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Spatio-temporal density of the demersal Chondrichthyes assemblage in an upper bathyal of the eastern Mediterranean Sea

Deval,

Mutlu

2024

Mar. Biodivers.

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Chondrichthyans are a very important taxon that plays a role at the top of the trophic level of the food chain and are vulnerable species in the marine ecosystem. The deep waters of the eastern Mediterranean Sea have been less studied than the continental shelf, especially for the chondrichthyans.Therefore, the present study was conducted to investigate the spatio-temporal distribution of chondrichthyans collected monthly in different depth strata (200-900 m) during different periods (2010-2011 and 2019-2021) using an otter bottom trawl. A total of 17 species were identi ed, consisting composed of 6 batoids, 10 sharks and 1 chiemaers was identi ed. The constant species (dominance: DO%> 50) in the study area were Galeus melastomus, Scyliorhinus canicula, Etmopterus spinax and Raja clavata. The most abundant species was E. spinax, followed by G. melastomus. There were 14 species in the rst survey and 15 species in the second survey. Faunistic characteristics (number of species, abundance, diversity indices) varied only with bottom depth. Two different depthwise assemblages were estimated along the bottom depth gradient; ≤ 500 m and > 500 m. The discriminator species were R.clavata, S.canicula, G. melastomus, D. oxyrinchus and S. blainvillei found on the upper slope and E. spinax, G. melastomus and Centrophorus granulosus found on the lower slope. We estimated a total number of 26 species found in Antalya Bay, which was higher than the number reported in the previous studies.

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Spatiotemporal Density and Ecology of Batoids (Elasmobranchii) Along a Turkish Shelf-upper Slope of the Mediterranean Sea During Years 2009–2015

Cited by 5 publications

References 31 publications

Biological Parameters and Biomass and Abundance Indices of Two Demersal Species, Turbot (Scophthalmus maximus) and Thornback Ray (Raja clavata), Estimated by a Trawl Survey in Western Black Sea

Biological Parameters and Biomass and Abundance Indices of Two Demersal Species, Turbot (Scophthalmus maximus) and Thornback Ray (Raja clavata), Estimated by a Trawl Survey in Western Black Sea

I Like This New Me: Unravelling Population Structure of Mediterranean Electric Rays and Taxonomic Uncertainties within Torpediniformes

Spatio-temporal density of the demersal Chondrichthyes assemblage in an upper bathyal of the eastern Mediterranean Sea

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