The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Jose Maria Bellido - One of the best experts on this subject based on the ideXlab platform.
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a trophic latitudinal gradient revealed in anchovy and Sardine from the western mediterranean sea using a multi proxy approach
Scientific Reports, 2020Co-Authors: Eneko Bachiller, Marta Albopuigserver, Joan Gimenez, Maria Grazia Pennino, Neus Marimena, Antonio Esteban, Elena Lloretlloret, Angelique Jadaud, Belen Carro, Jose Maria BellidoAbstract:This work combines state-of-the-art methods (DNA metabarcoding) with classic approaches (visual stomach content characterization and stable isotope analyses of nitrogen (δ15N) and carbon (δ13C)) to investigate the trophic ecology of anchovy (Engraulis encrasicolus) and Sardine (Sardina pilchardus) at high taxonomic and spatial resolution in the Western Mediterranean Sea. Gut contents observed are in accordance with the dietary plasticity generally described for anchovy and Sardine, suggesting a diet related to the opportunistic ingestion of available prey in a certain area and/or time. Genetic tools also showed modest inter-specific differences regarding ingested species. However, inter-specific and intra-specific differences in ingested prey frequencies and prey biomass reflected a latitudinal signal that could indicate a more effective predation on large prey like krill by anchovy versus Sardine, as well as a generalized higher large prey ingestion by both species southwards. In fact, both species presented lower δ15N in the northernmost area. This latitudinal gradient indicates changes in the trophic ecology of anchovy and Sardine that coincide with previously described better biological conditions for fish in the southern part of the study area as well as higher landings of both species in recent years.
Fatih Ozogul - One of the best experts on this subject based on the ideXlab platform.
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effect of the icing with rosemary extract on the oxidative stability and biogenic amine formation in Sardine Sardinella aurita during chilled storage
Food and Bioprocess Technology, 2012Co-Authors: Gulsun Ozyurt, Esmeray Kuley, Esra Balikci, Cigdem Kacar, Saadet Gokdogan, Miray Etyemez, Fatih OzogulAbstract:The effect of icing with the rosemary extract on the quality and safety of Sardines (Sardinella aurita) was assessed through the chemical, sensory and microbiological methods. The sensory acceptability limit was 12 days for Sardine stored in traditional ice and 15 days for Sardine stored in ice prepared from rosemary extract solution. There were no significant differences between Sardine stored in ice with both 0.05% and 0.1% rosemary extract in terms of sensory acceptability. Storage of Sardine in ice containing rosemary extract improved the sensory and some of the chemical quality parameters as compared with the traditional icing, which resulted in a significant extension in the shelf life of Sardine. Eleven biogenic amines were determined for food quality and safety. Icing containing rosemary extract had a positive effect, causing low biogenic amine content, especially histamine and putrescine. Histamine content of Sardine also increased rapidly with time when the number of bacteria reached above 106 cell/g, which is a good correlation between histamine content and number of bacteria. Consequently, the application of ice containing rosemary extract improved the quality and safety of Sardine, which can be explored by the food industry.
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the effects of modified atmosphere packaging and vacuum packaging on chemical sensory and microbiological changes of Sardines sardina pilchardus
Food Chemistry, 2004Co-Authors: Fatih Ozogul, Abdurrahma Pola, Yesim OzogulAbstract:Abstract Chemical, sensory and microbiological evaluation of Sardine ( Sardina pilchardus ), with emphasis on the quality and safety parameters in modified atmosphere packaging (MAP) and vacuum packaging (VP), were investigated. Quality assessment of Sardines stored in MAP (60%CO 2 :40%N 2 ) and VP for up to 15 days at 4 °C was done by the monitoring of sensory quality, total viable counts (TVC), nucleotide degradation products, histamine, trimethylamine (TMA) and total volatile base nitrogen (TVB-N). The observed shelf life of Sardine was found to be 12 days in MAP, 9 days in VP and 3 days in air. Bacteria grew most quickly in Sardine stored in air, followed by those in VP and the lowest counts were with MAP. The concentration of histamine increased and its level reached over 20 mg/100 g for fish stored in air, 13 mg/100 g for VP and 10 mg/100 g for MAP at 15 days. The highest concentration of TMA was obtained from Sardine stored in air, followed by Sardine stored in VP and the lowest in MAP. The formation of TVB-N increased with time of storage. When the TVC had reached 10 6 cfu/g, the TVB-N content was found to be approximately 15 mg/100 g muscle for all storage conditions.
Carl D. Van Der Lingen - One of the best experts on this subject based on the ideXlab platform.
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Incorporating parasite data in population structure studies of South African Sardine Sardinops sagax.
Parasitology, 2014Co-Authors: Carl D. Van Der Lingen, Laura Frances Weston, Nurudean Norman Ssempa, Cecile ReedAbstract:A multidisciplinary approach has been applied to examine the population structure of Sardine Sardinops sagax off South Africa, where this species supports significant fisheries and is also of ecological and eco-tourism importance. Observations of discontinuous Sardine distribution patterns, discrete spawning grounds and significant spatial differences in a variety of phenotypic characteristics have suggested the existence of discrete western, southern and eastern Sardine sub-populations or stocks. The use of parasites as biological tags to elucidate Sardine population structure has recently been investigated, and strong spatial gradients around South Africa in the prevalence, mean infection intensity and mean abundance of a digenean 'tetracotyle' type metacercarial endoparasite considered to be of the genus Cardiocephaloides and found in the humours of fish eyes support and have proved particularly convincing evidence for the Sardine multiple stock hypothesis. A discontinuous distribution in the occurrence of another parasite, the coccidean Eimeria sardinae found in fish testes, has provided additional but weaker evidence of discrete stocks. These results have contributed to a changed understanding of the population structure of South African Sardine and have significant implications for management of the fisheries for this species.
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diet and feeding intensity of Sardine sardina pilchardus correlation with satellite derived chlorophyll data
Marine Ecology Progress Series, 2008Co-Authors: Susana Garrido, Radhouan Benhamadou, Paulo B Oliveira, Maria Emilia Cunha, Maria Alexandra Chicharo, Carl D. Van Der LingenAbstract:Spatio-temporal variability of the diet of Sardine Sardina pilchardus off Portugal was examined through analysis of the stomach contents of fish collected every 14 d from the west and south of Portugal during 2003/2004. Dietary composition of the modal Sardine length class was assessed by determining the frequency of occurrence and carbon content of identified prey, and these 2 parameters were combined to estimate a modified index of relative importance of prey (mIRI). The most important prey for Sardines were zooplankton, comprising crustacean eggs, copepods, decapods, cirripedes and fish eggs, dinoflagellates and diatoms (particularly the toxin-producer genus Pseudo-nitzschia), which together accounted for >90% of the estimated dietary carbon. Dietary seasonality was similar for both areas, except that the contribution of phytoplankton was higher for fish from the west Portuguese coast, where upwelling events are stronger and recurrent during spring and summer months. The predominance of prey <750 μm in Sardine diet suggests that filter feeding is the dominant feeding mode used in the wild. Feeding intensity was similar for both sexes and for fish of different length classes and was higher on the west coast than in the south, which is probably related to the higher productivity of the west coast. Although there was high inter-annual variability in feeding intensity, this parameter was highest for both areas during spring and winter months. Temporal variability in satellite-derived chlorophyll a matched the temporal variability in the dietary contribution by phytoplankton and of Sardine feeding intensity, suggesting further investigation of the potential use of satellite-derived chlorophyll a data as a proxy for Sardine feeding intensity.
Eneko Bachiller - One of the best experts on this subject based on the ideXlab platform.
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a trophic latitudinal gradient revealed in anchovy and Sardine from the western mediterranean sea using a multi proxy approach
Scientific Reports, 2020Co-Authors: Eneko Bachiller, Marta Albopuigserver, Joan Gimenez, Maria Grazia Pennino, Neus Marimena, Antonio Esteban, Elena Lloretlloret, Angelique Jadaud, Belen Carro, Jose Maria BellidoAbstract:This work combines state-of-the-art methods (DNA metabarcoding) with classic approaches (visual stomach content characterization and stable isotope analyses of nitrogen (δ15N) and carbon (δ13C)) to investigate the trophic ecology of anchovy (Engraulis encrasicolus) and Sardine (Sardina pilchardus) at high taxonomic and spatial resolution in the Western Mediterranean Sea. Gut contents observed are in accordance with the dietary plasticity generally described for anchovy and Sardine, suggesting a diet related to the opportunistic ingestion of available prey in a certain area and/or time. Genetic tools also showed modest inter-specific differences regarding ingested species. However, inter-specific and intra-specific differences in ingested prey frequencies and prey biomass reflected a latitudinal signal that could indicate a more effective predation on large prey like krill by anchovy versus Sardine, as well as a generalized higher large prey ingestion by both species southwards. In fact, both species presented lower δ15N in the northernmost area. This latitudinal gradient indicates changes in the trophic ecology of anchovy and Sardine that coincide with previously described better biological conditions for fish in the southern part of the study area as well as higher landings of both species in recent years.
Rachid Amara - One of the best experts on this subject based on the ideXlab platform.
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What can otolith shape analysis tell us about population structure of the European Sardine, Sardina pilchardus, from Atlantic and Mediterranean waters?
Journal of Sea Research, 2015Co-Authors: Sherif Jemaa, Mahmoud Bacha, Khalef Rabhi, Gaby Khalaf, David Dessailly, Rachid AmaraAbstract:The European Sardine, Sardina pilchardus, exhibits a complex population structure, which has produced conflicting results in previous genetic studies. Despite its importance in the fisheries industry, stock delineation for management and conservation purposes is still a matter of debate throughout the distribution range of the species. This study examines whether otolith shapes are more efficient than genetic markers to detect population structure in pelagic species with large population sizes. Sardines were analyzed from 15 sampling localities in the Northeast Atlantic and Mediterranean Sea covering almost the whole distribution range of the species. A combination of otolith shape indices and elliptic Fourier descriptors was investigated by multivariate statistical procedures. Within the studied area, three distinct groups were identified with an overall correct classification of 77%. Group A: northern Mediterranean Sea and Gulf of Gabès; group B: Atlantic Morocco–south Alboran–Algero-provençal coasts; and group C: European Atlantic coast. The Almeria–Oran front and the Gibraltar strait are not an efficient barrier for Sardine population separation as there seems to be exchanges between populations of the south-western Mediterranean Sea and those of the Moroccan Atlantic Ocean coast or Gulf of Cadiz. The results are discussed in relation to environmental conditions, oceanographic features, and physical barriers to dispersal in the study area, and compared with those obtained by previous genetic, morphometric, and meristic data. For pelagic species with high gene flow, present results highlighted the need to take into account the identification of phenotypic stocks to ensure sustainable fishery benefits and efficient conservation as they may have unique demographic properties and responses to exploitation.
