Demersal chondrichthyans in the western Mediterranean: assemblages and biological parameters of their main species

2016 ◽  
Vol 67 (5) ◽  
pp. 636 ◽  
Author(s):  
Sergio Ramírez-Amaro ◽  
Francesc Ordines ◽  
Bàrbara Terrasa ◽  
Antonio Esteban ◽  
Cristina García ◽  
...  
Keyword(s):  
Western Mediterranean ◽  
Scaling Analysis ◽  
Trawl Survey ◽  
Biological Parameters ◽  
Northern Spain ◽  
Multidimensional Scaling Analysis ◽  
Important Species ◽  
Main Species ◽  
Composition And Structure ◽  
The Mediterranean

The composition and structure of demersal chondrichthyan assemblages and the biological parameters of their main species were compared in four geographical subareas (GSAs) established by the General Fisheries Commission for the Mediterranean in the western Mediterranean:northern Alboran Sea (GSA01) and Alboran Island (GSA02), Balearic Islands (GSA05) and northern Spain (GSA06), with the first two being considered jointly. Data were obtained from 199 hauls undertaken from May to June 2013 during the Spanish International Bottom Trawl Survey in the Mediterranean (MEDITS). Twenty-five different chondrichthyan species were caught in all GSAs: seven were common to all areas, five appeared only in GSA01, nine appeared only in GSA05 and one appeared only in GSA06. Analysis of community structure (clusters, multidimensional scaling, analysis of similitude) revealed two assemblages related to depth, with very similar bathymetric ranges in all GSAs, namely continental shelf (from 41 to 252m) and slope (from 284 to 813m). The highest diversity, biomass and abundance values on the shelf and slope assemblages were recorded in GSA05 and GSA01 respectively. These results highlight the effects of the distinct fishing and oceanographic parameters related to the GSAs. Generally, the biological parameters of the most important species did not show differences between GSAs, which could suggest the existence of a single population in the western Mediterranean.

scholarly journals Parasite communities in two sparid fishes from the western Mediterranean: a comparative analysis based on samples from three localities off the Algerian coast

2017 ◽  
Vol 54 (1) ◽  
pp. 26-35 ◽  
Author(s):  
F. Benhamou ◽  
D. Marzoug ◽  
Z. Boutiba ◽  
A. Kostadinova ◽  
A. Pérez-Del-Olmo
Keyword(s):  
Feeding Habits ◽  
Parasite Community ◽  
Western Mediterranean ◽  
Parasite Communities ◽  
Composition And Structure ◽  
Algerian Coast ◽  
The Mediterranean ◽  
Boops Boops ◽  
Abundant Data ◽  
General Prediction

Summary We provide the first known comparative assessment of metazoan parasite communities in two taxonomically and ecologically related sparids, Boops boops and Spicara maena, that are common in the coastal infralittoral habitats in the Mediterranean. Using abundant data for infracommunities in three localities off the Algerian coasts of the Mediterranean, we tested the general prediction that the phylogenetic proximity of the two hosts, their overlapping geographical distribution and habitat occupation, as well as the similar feeding habits and diet would contribute to a homogenization of their parasite community composition and structure. The regional fauna of parasites of B. boops and S. maena along the Algerian coasts of the western Mediterranean was species-rich (36 species) and dominated by heteroxenous species (27 spp; of these 20 digenean spp.). The phylogenetic relatedness between the two hosts resulted in a large number of shared parasites (56 %, 20 spp.). However, the significant overlap in the parasite faunas of the two sparid hosts and their similar feeding habits and diet did not translate into homogeneous parasite community pattern; a significant differentiation in terms of both, composition and structure, was observed.

scholarly journals Designing fisheries restricted areas using standard fishery survey data: a novel multilevel spatio-temporal approach

2021 ◽  
Author(s):  
Iosu Paradinas ◽  
Joan Giménez ◽  
David Conesa ◽  
Antonio López-Quílez ◽  
Maria Grazia Pennino
Keyword(s):  
Survey Data ◽  
Western Mediterranean ◽  
Species Level ◽  
Trawl Survey ◽  
Conservation Priority ◽  
Distribution Models ◽  
Important Species ◽  
Priority Areas ◽  
Spatio Temporal ◽  
And Shifts

AbstractFishery restricted areas (FRAs) are pivotal for the mitigation of fishery impacts, but the designation of optimum FRAs is complex, and currently there is no quantitative guideline to assess the spatio-temporal variability of conservation priority areas. Fishery systems are naturally dynamic, and shifts may at two different levels, the species level and the community level. As a consequence, the identification of optimum FRAs using standard fishery data should follow a spatiotemporal procedure that accounts for both levels of dynamism. Here, we describe an approach to optmise the location of FRAs assessing the spatiotemporal dynamism of conservation priority areas at both the species and the multi-species level. To do so, we first assess species-specific dynamisms through Species Distribution Models (SDMs). Then, we use SDM results to explore different spatial prioritisation software configurations to assess the suitability of fixed, progressive, or more complex fishery restricted area designs. Finally, we assess the ecologic and socioeconomic impact of FRA candidates based on our SDM estimates and fishery footprint data, respectively. The proposed method is illustrated through a western Mediterranean case study using scientific trawl survey data on six commercially important species collected over 17 years. Following this approach, we identified two main priority area patterns in the study area. Each pattern is predominant during a different period of the study, constituting a clear example of the importance of regularly re-assessing FRA designs. We conclude that a spatiotemporal assessment of conservation priority areas using long-term data is essential to inform the location of new FRAs.

scholarly journals COMPOSICIÓN Y ESTRUCTURA DEL ENSAMBLAJE DE CRUSTÁCEOS BRACHYURA DE LA PLATAFORMA CONTINENTAL DE LA GUAJIRA COLOMBIANA Y SU RELACIÓN CON LA PROFUNDIDAD Y LAS CARACTERÍSTICAS DEL SEDIMENTO

2016 ◽  
Vol 39 (2) ◽  
Author(s):  
Luis Gómez Lemos ◽  
Norella Cruz Castaño ◽  
Guillermo Duque Nivia
Keyword(s):  
Environmental Variability ◽  
Environmental Stability ◽  
Scaling Analysis ◽  
Sampling Station ◽  
Total Abundance ◽  
Depth Gradient ◽  
Sediment Characteristics ◽  
Multidimensional Scaling Analysis ◽  
Composition And Structure ◽  
Ordination Analysis

Brachyura crustaceans composition and structure assemblage along be continental shelf of La Guajira and its variation according to depth gradient and sediment characteristics were determined. 44 bottom drag samples were taken at 10 and 50 m depth using a semi globe demersal net, during March and April 2005. 83 species belonging to 21 families were identified; the most important families due to their abundance of specimens and amount of species were Goneplacidae, Portunidae, and Mithracidae; and dominant species were Glyptoplax smithii, with, 12.53 % of total abundance; Portunus spinicarpus, 7.42 % and Nemausa cornuta, 6.84 %. The non-metric multidimensional scaling analysis (NMDS) did not show any well defined sampling station clusters, but meaningful statistical differences were found in the assemblage structure according to depth gradient and the different kinds of sediments. The ANOSIM tests and the ordination analysis (NMDS) pointed out that there is a single assemblage that varies gradually with depth, and to a lesser degree by physical sediments characteristics. The ordination (NMDS) also reveals that the assemblage is more heterogeneous at 10 m than at 50 m depth, possibly as a result of the larger environmental variability close to the coast, in comparison with the environmental stability that characterizes deeper zones.

scholarly journals On the presence of the Endangered white skate Rostroraja alba in Sardinian waters

2020 ◽  
Author(s):  
MARTINA FRANCESCA MARONGIU ◽  
CRISTINA PORCU ◽  
ANDREA BELLODI ◽  
RITA CANNAS ◽  
LAURA CARUGATI ◽  
...  
Keyword(s):  
Western Mediterranean ◽  
Morphological Description ◽  
Trawl Survey ◽  
International Union ◽  
Sandy Bottom ◽  
The Mediterranean

The white skate Rostroraja alba is assessed by the International Union for Conservation of Nature as Endangered globally and is now considered rare in the Mediterranean. This species has never been recorded in Sardinian seas (central western Mediterranean), but an empty eggcase was collected on a sandy bottom off the western Sardinia coasts during the MEDiterranean International Trawl Survey (MEDITS) program in 2019. A morphometric and morphological description of the Sardinian eggcase, after a comparison with measurements from other Mediterranean and Atlantic specimens, showed it to be clearly ascribable to Rostroraja alba.

scholarly journals Determination of antioxidant activity and phenolic compounds for basic standardization of Turkish propolis

2021 ◽  
Vol 64 (1) ◽  
Author(s):  
Aslı Özkök ◽  
Merve Keskin ◽  
Aslı Elif Tanuğur Samancı ◽  
Elif Yorulmaz Önder ◽  
Çiğdem Takma
Keyword(s):  
Antioxidant Capacity ◽  
Caffeic Acid ◽  
Caffeic Acid Phenethyl Ester ◽  
Total Phenolic ◽  
Scaling Analysis ◽  
Flavonoid Content ◽  
Multidimensional Scaling Analysis ◽  
Flavonoid Quercetin ◽  
Phenolic And Flavonoid

AbstractThis study aimed to determine the standard amount of antioxidant content and compounds of the propolis for the standardization of propolis. For this purpose, the total flavonoids, total phenolic, CUPRAC antioxidant capacity content and the diversity of phenolic and flavonoid components of these propolis samples were found by HPLC determined at the 23 propolis samples which were collected different regions of Turkey. Beside that, the similarities and differences of these 23 provinces to each other according to their antioxidant capacities were investigated by multidimensional scaling analysis. The total flavonoid content in the propolis samples were determined between 21.28 and 152.56 mg CE/g. The total phenolic content in the propolis samples was found between 34.53 mg and 259.4 mg GAE/g. CUPRAC antioxidant capacity of the propolis samples and antioxidant range was found from 95.35 to 710.43 mg TE/g. Also, 4 flavonoid [Quercetin (min.1.12–max.4.14 mg/g), Galangin (min.0.72–max.40.79 mg/g), Apigenin (min.1.07–max.17.35 mg/g), Pinocembrin (min.1.32–max.39.92 mg/g] and 6 phenolic acid [Caffeic acid (min.1.20–max.7.6 mg/g), p-Coumaric acid (min.1.26–max.4.47 mg/g), trans-Ferulic acid (min.1.28–max.4.92 mg/g), Protocatechuic acid (1.78 mg/g), trans-Cinnamic acid (min.1.05–max.3.83 mg/g), Caffeic Acid Phenethyl Ester (CAPE) (min.1.41–max.30.15 mg/g)] components were detected as mg/g, in different ratios in propolis samples collected from different regions. The feature of this study, so far, is to have the maximum number of samples representing the Turkish propolis, and so is thought to help to national and international propolis standard workings.

scholarly journals Predicted shifts of groundfish distribution in the Eastern Bering Sea under climate change, with implications for fish populations and fisheries management

2020 ◽  
Author(s):  
Christopher N Rooper ◽  
Ivonne Ortiz ◽  
Albert J Hermann ◽  
Ned Laman ◽  
Wei Cheng ◽  
...  
Keyword(s):  
Bering Sea ◽  
Marine Species ◽  
Species Distribution Modelling ◽  
Fish Populations ◽  
Trawl Survey ◽  
Climate Scenarios ◽  
Important Species ◽  
Eastern Bering Sea ◽  
Northern Latitudes ◽  
Distribution Shifts

Abstract Climate-related distribution shifts for marine species are, in general, amplified in northern latitudes. The objective of this study was to predict future distributions of commercially important species in the eastern Bering Sea under six climate scenarios, by incorporating predictions of future oceanographic conditions. We used species distribution modelling to determine potential distribution changes in four time periods (2013–2017, 2030–2039, 2060–2069, and 2090-2099) relative to 1982–2012 for 16 marine fish and invertebrates. Most species were predicted to have significant shifts in the centre of gravity of the predicted abundance, the area occupied, and the proportion of the predicted abundance found in the standard bottom trawl survey area. On average the shifts were modest, averaging 35.2 km (ranging from 1 to 202 km). There were significant differences in the predicted trend for distribution metrics among climate scenarios, with the most extensive changes in distribution resulting from Representative Concentration Pathway 8.5 climate scenarios. The variability in distributional shifts among years and climate scenarios was high, although the magnitudes were low. This study provides a basis for understanding where fish populations might expand or contract in future years. This will provide managers’ information that can help guide appropriate actions under warming conditions.

scholarly journals The Bioactive Potential of Trawl Discard: Case Study from a Crinoid Bed Off Blanes (North-Western Mediterranean)

Marine Drugs ◽  
2021 ◽  
Vol 19 (2) ◽  
pp. 83
Author(s):  
Alfredo García-de-Vinuesa ◽  
Montserrat Demestre ◽  
Arnau Carreño ◽  
Josep Lloret
Keyword(s):  
Bioactive Compounds ◽  
Fish Habitat ◽  
Antibacterial Properties ◽  
Marine Species ◽  
Western Mediterranean ◽  
Bioactive Molecules ◽  
Added Value ◽  
Future Research ◽  
Trawl Survey ◽  
Bioactive Potential

Although knowledge of the bioactive compounds produced by species inhabiting coastal waters is increasing, little is known about the bioactive potential produced by marine species occupying deeper habitats with high biodiversity and productivity. Here, we investigate about the bioactive potential of molecules produced by species that inhabit the crinoid beds, a poorly known essential fish habitat affected by trawling, wherein large amounts of commercial and noncommercial species are discarded. Based on a trawl survey conducted in 2019, 14% of the 64 species discarded on crinoid beds produce molecules with some type of bioactive potential, including; soft corals (Alcyonium palmatum); tunicates (Ascidia mentula); bony fish, such as horse mackerel (Trachurus trachurus); European hake (Merluccius merluccius); and chondrichthyans, such as small-spotted catshark (Scyliorhinus canicula). In addition, 16% of the discarded species had congeneric species that produce compounds with bioactive potential, indicating that such species might also possess similar types of bioactive molecules. Molecules with antioxidant, antitumour, antihypertensive, and antibacterial properties were the most frequent, which could provide the basis for future research aiming to discover new marine-based drugs and compounds for other human uses. Among all species or genera that produce compounds with bioactive potential, 68% presented medium or high vulnerability to trawling. Results show that the discarded catch contains many species, which produce different bioactive compounds that represent an added-value resource. These results highlight the importance of manage properly crinoid beds, to ensure that species that produce molecules with bioactive potential inhabiting these habitats are protected.

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