Main Features of the Geochemistry and Sedimentology of the Mediterranean Sea

Emelyanov, Emelyan M; Shimkus, K. M.

doi:10.1007/978-94-009-4490-9_4

Cited by 3 publications

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“…mainly linked to edafic factors, especially in the coastal area. In this study the second structuring factor seems to be a sedimentary aspect, which repre- sents a gradient of increasingly fine particles (fine silt and mud) in sediments (Emylianov and Schimkus, 1986). Sediment grain size, which is determined by hydrodynamic sorting mechanisms, and organic content are considered the second most influential characteristics that determine occupancy by marine benthos (Gray, 1981); this factor could be more important for benthic decapods.…”

Section: Discussionmentioning

confidence: 86%

“…Data on the main macro-epibenthic species found for each assemblage are available in Colloca et al (2003). Based on grain size composition, according to Emylianov and Schimkus (1986), the continental shelf shallower than 50 m is characterized by sand (1-0.1 mm fraction dominates), aleuritic (0.1-0.001 mm) and pelitic (<0.001 mm fraction dominates) sediments are found between 50 and 100 m, and bottom sediments are mainly composed of pelitic muds below 100 m.…”

Section: Study Area and Data Collectionmentioning

confidence: 99%

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Decapod crustacean assemblages off the West coast of central Italy (western Mediterranean)

Fanelli¹,

Colloca²,

Ardizzone³

2007

Sci. Mar.

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SUMMARY: Community structure and faunal composition of decapod crustaceans off the west coast of central Italy (western Mediterranean) were investigated. Samples were collected during five trawl surveys carried out from June 1996 to June 2000 from 16 to 750 m depth. Multivariate analysis revealed the occurrence of five faunistic assemblages: 1) a strictly coastal community over sandy bottoms at depths <35 m; 2) a middle shelf community over sandy-muddy bottoms at depths between 50 and 100 m; 3) a slope edge community up to 200 m depth as a transition assemblage; 4) an upper slope community at depths between 200 and 450 m, and 5) a middle slope community at depths greater than 450 m. The existence of a shelfslope edge transition is a characteristic of the western and central Mediterranean where a Leptometra phalangium facies is found in many areas at depths between 120 and 180 m. The brachyuran crab Liocarcinus depurator dominates the shallow muddy-sandy bottoms of the shelf, while Parapenaeus longirostris is the most abundant species from the shelf to the upper slope assemblage. The dominant species on the middle slope are mainly nektobenthic (Aristeus antennatus, Aristaeomorpha foliacea, Plesionika martia), bentho-pelagic (Pasiphaea sivado) and benthic species (Nephrops norvegicus). The average diversity of the five assemblages defined increased with depth and the highest diversity values were found in the slope assemblages. Depth is the main factor influencing decapod assemblage composition, but sediment type and dissolved organic matter seem to be secondary structuring factors particularly in the shelf zone.Keywords: distribution, assemblages, Decapoda, Mediterranean. LA COSTA OESTE DE ITALIA CENTRAL (MEDITERRÁNEO OCCIDENTAL. -Se ha estudiado la estructura de la comunidad y la composición faunística de crustáceos decápodos en la costa oeste de Italia central (Mediterráneo occidental). Las muestras fueron tomadas durante cinco campañas de prospección pesquera demersal llevadas a cabo entre Junio 1996 y Junio 2000 a profundidades comprendidas entre 16 y 750 m de profundidad. Análisis multivariantes mostraron la presencia de cinco asociaciones faunísticas: 1) una comunidad estrictamente costera sobre fondos de arena a profundiades <35 m; 2) una comunidad de la plataforma continental media sobre fondos arenosofangosos a profundidades comprendidas entre 50 y 100 m; 3) una comunidad del borde de la plataforma continental hasta los 200 m, como asociación de transición; 4) una comunidad de talud superior entre 200 y 450 m, y 5) una comunidad del talud medio a profundidades superiores a 450 m. La existencia de una transición plataforma-talud es una característica del Mediterráneo occidental y central, en la que la facies de Leptometra phalangium se encuentra en muchas áreas a profundidades comprendidas entre 120 y 180 m. El cangrejo braquiuro Liocarcinus depurator domina en los fondos someros fangoso-arenosos de la plataforma continental, mientras que Parapenaeus longirostris es la especie más abundante desde la plata...

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Section: Discussionmentioning

confidence: 86%

Section: Study Area and Data Collectionmentioning

confidence: 99%

Decapod crustacean assemblages off the West coast of central Italy (western Mediterranean)

Fanelli¹,

Colloca²,

Ardizzone³

2007

Sci. Mar.

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“…Effectively, sediment texture, sediment grain size and organic matter, which are directly related to depth [ 71 , 72 ], play an important role in the distribution of some crustacean species e.g. [ 73 – 78 ]. Indeed, previous studies in the same area have reported a clear bathymetric zonation according to sediment type [ 50 , 74 ].…”

Section: Discussionmentioning

confidence: 99%

“…The surface sediments of the Cyclades Plateau consist mostly of biogenic sand (50–70%), with large amounts of coralline algae debris and terrigenous sand attributed to relict palaeobeach deposits (30–40%), and the deeper parts (150–250 m) are covered by sediments ranging from calcareous muddy sand to sandy mud [ 42 ]. Sediments in the other two areas have been described as terrigenous in origin, with coarser sediments in the coastal zone, calcareous muddy sand with small amounts of terrigenous silt and fine sand at the shelf break, and a more homogeneous fine sediment texture of hemi-pelagic deposition in the middle slope [ 78 ]. The sediment characteristics, particularly the high variability in grain size, is probably the main reason for the higher diversity values of crustaceans at Dodecanese and Crete ( Fig 2 ).…”

Section: Discussionmentioning

confidence: 99%

Comparing demersal megafaunal species diversity along the depth gradient within the South Aegean and Cretan Seas (Eastern Mediterranean)

et al. 2017

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Knowledge on biodiversity patterns of demersal megafaunal species in the Mediterranean and particularly in its eastern basin is still very scarce. In the present study, fine-scale diversity patterns in relation to depth were analyzed for three major megafaunal groups (fish, cephalopods and crustaceans) in three subareas of the eastern Mediterranean (Crete, Cyclades and Dodecanese islands). The analysis was based on data from the Mediterranean International Trawl Survey conducted during 2005–2014 and the relationship between depth and two different diversity measures (species richness and Shannon-Weaver) was examined using Generalized Additive Modeling (GAM) techniques. Species richness of fish decreased with depth in two of the three subareas (Cyclades, Dodecanese), while the opposite was true for crustaceans in all subareas. Cephalopods had higher species richness at intermediate depths, near the shelf break. Significant differences among subareas were found, with Crete showing a distinct species richness-depth pattern, which was more obvious for fish and cephalopods. The differences among subareas were also highlighted based on the occurrence of alien species of Indo-Pacific origin, which were more frequent in Crete. Our results suggested that the importance of depth-related factors in structuring communities was higher for cephalopods and less important for fish, and that Crete showed a distinct diversity-depth relationship, a fact that can be attributed to its specific geographical and oceanographic characteristics. These results support the current GFCM/FAO’s characterization of Crete as a unique geographic subarea. The findings of the study contribute to understanding the causes of underlying diversity patterns and would assist various environmental management actions, particularly those related to the establishment of marine-protected areas.

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Last glacial?Holocene sediment sequences in N. Aegean basins: structure, accumulation rates and clay mineral distribution

et al. 2004

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Main Features of the Geochemistry and Sedimentology of the Mediterranean Sea

Cited by 3 publications

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Decapod crustacean assemblages off the West coast of central Italy (western Mediterranean)

Decapod crustacean assemblages off the West coast of central Italy (western Mediterranean)

Comparing demersal megafaunal species diversity along the depth gradient within the South Aegean and Cretan Seas (Eastern Mediterranean)

Last glacial?Holocene sediment sequences in N. Aegean basins: structure, accumulation rates and clay mineral distribution

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