scholarly journals Multi-isotopic assessments of spatio-temporal diet variability: the case of two sympatric gulls in the western Mediterranean

2018 ◽  
Vol 606 ◽  
pp. 201-214 ◽  
Author(s):  
V Morera-Pujol ◽  
R Ramos ◽  
N Pérez-Méndez ◽  
M Cerdà-Cuéllar ◽  
J González-Solís
Keyword(s):  
Western Mediterranean ◽  
Diet Variability ◽  
Spatio Temporal

scholarly journals Distribution and population structure of the rockfish Helicolenus dactylopterus (Pisces: Scorpaenidae) in the western Mediterranean

2001 ◽  
Vol 81 (1) ◽  
pp. 129-141 ◽  
Author(s):  
Enric Massutí ◽  
Joan Moranta ◽  
L. Gil de Sola ◽  
B. Morales-Nin ◽  
Llucia Prats
Keyword(s):  
Population Structure ◽  
Juvenile Fish ◽  
Western Mediterranean ◽  
Small Fish ◽  
Depth Range ◽  
Southern Area ◽  
Northern Areas ◽  
Helicolenus Dactylopterus ◽  
Spatio Temporal ◽  
And Cluster Analysis

The distribution and spatio–temporal variation of Helicolenus dactylopterus (Pisces: Scorpaenidae) population was studied from 816 bottom trawls developed along the Iberian coast. Multifactor analysis of variance was used to test the differences in abundance and biomass and cluster analysis was applied to detect differences in population structure. The results showed a bathymetric and latitudinal gradient in abundance and population structure along three geographic sectors in the surveyed area. In the southern area, the species was more frequent and showed a wider bathymetric distribution range than northwards. The depth range with the maximum frequency of occurrence was also wider in the southern area than northwards. Similar trends were observed in terms of abundance and biomass, with the highest and lowest indices in the southern and northern areas, respectively. The age composition of the catches showed that the population consisted mainly of young-of-the-year and juvenile fish. This fraction of the population is well represented, at a mesoscale, along the whole surveyed area, but adults are well represented only at a local scale, at the deepest strata surveyed in the southern area. In this case, recruits of age 0 and juveniles up to 4-y old were restricted to depths shallower than 500 m, while adult fish older than 6 y of age appeared below this depth. In the southern area, seasonal changes in the population structure were also observed, with modes of small fish (3–6 cm) from March to June, as a consequence of the species recruitment to the bottom. Some direct and indirect factors of biogeographic, environmental and anthropogenic origin affecting the observed gradient are discussed.

scholarly journals Spatio-temporal assessment of the PCB sediment contamination in the four main French River Basins (1945–2018)

2019 ◽  
Author(s):  
André-Marie Dendievel ◽  
Brice Mourier ◽  
Alexandra Coynel ◽  
Olivier Evrard ◽  
Pierre Labadie ◽  
...  
Keyword(s):  
Large Scale ◽  
Sharp Decrease ◽  
Dry Weight ◽  
Western Mediterranean ◽  
Port Authorities ◽  
Suspended Particulate ◽  
Degradation Rates ◽  
Garonne River ◽  
Spatio Temporal ◽  
Living Organisms

Abstract. Environmental pollution by Polychlorinated Biphenyls (PCBs) is a key concern about river quality because of their low degradation rates leading to their accumulation in sediments or living organisms. This original interdisciplinary work was conducted at a large scale along the four main French rivers (Seine, Rhône, Loire and Garonne Rivers), which flow into major European seas. We completed a dataset based on sediment analyses provided by monitoring agencies, port authorities and research teams on different solid matrices (cores, bed and flood sediments, suspended particulate matters, dredged sediments). This dataset (n=1416) focused on the seven indicator PCBs and their sum (∑PCBi) from 1945 to 2018. Special effort was put on the quality control to provide robust spatio-temporal information. Taking into account hydrological and human drivers, we outlined two main pollution trends: (1) from 1945 to 1975, a quick increase of ∑PCBi (up to 4 mg.kg−1 dry weight, dw) and a sharp decrease in the 1980s on the Seine and Loire Rivers; (2) increasing but moderate ∑PCBi levels (50 to 150 µg.kg−1 dw) followed by a decline after the 1990s on the Rhône and Garonne Rivers. In addition to these patterns, PCBs emissions from urban and industrial areas or accidental events were significant on each river. Finally, when calculating specific fluxes, the Rhône River exhibited the biggest ∑PCBi load (up to 12 µg.m−2.year−1 in 1977–1987), at least 25 % higher than those of the Seine and Loire Rivers, while the Garonne River showed very low fluxes. French specific ∑PCBi fluxes are two orders of magnitude lower than those found in American or Asian Rivers. In Europe, we confirmed that the Rhone and Seine Rivers provide a major supply of PCBi to the Western Mediterranean and the English Channel, respectively. The dataset is available at https://doi.pangaea.de/10.1594/PANGAEA.904277.

Spatio-temporal variations in deep-sea demersal communities off the Balearic Islands (western Mediterranean)

2008 ◽  
Vol 71 (3-4) ◽  
pp. 346-366 ◽  
Author(s):  
Joan Moranta ◽  
Antoni Quetglas ◽  
Enric Massutí ◽  
Beatriz Guijarro ◽  
Manuel Hidalgo ◽  
...  
Keyword(s):  
Deep Sea ◽  
Temporal Variations ◽  
Western Mediterranean ◽  
Balearic Islands ◽  
Spatio Temporal
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