scholarly journals Habitat Specialization in Tropical Continental Shelf Demersal Fish Assemblages

PLoS ONE ◽  
2012 ◽  
Vol 7 (6) ◽  
pp. e39634 ◽  
Author(s):  
Ben M. Fitzpatrick ◽  
Euan S. Harvey ◽  
Andrew J. Heyward ◽  
Emily J. Twiggs ◽  
Jamie Colquhoun
Keyword(s):  
Continental Shelf ◽  
Fish Assemblages ◽  
Demersal Fish ◽  
Habitat Specialization

scholarly journals Demersal fish assemblages and habitat characteristics on the continental shelf and upper slope of the north-western Mediterranean

2000 ◽  
Vol 80 (6) ◽  
pp. 981-988 ◽  
Author(s):  
Montserrat Demestre ◽  
Pilar Sánchez ◽  
Pere Abelló
Keyword(s):  
Continental Shelf ◽  
Fish Species ◽  
Fish Assemblages ◽  
Demersal Fish ◽  
Western Mediterranean ◽  
Habitat Characteristics ◽  
Species Assemblages ◽  
The North ◽  
Benthic Sediments ◽  
Upper Slope

Continental shelf and upper slope fish communities were studied along the Catalan coast based on 66 experimental bottom otter trawls. A total of 79 demersal fish species were studied by means of cluster analysis and multi-dimensional scaling (MDS) ordination for community structure. Analysis revealed the existence of five major location clusters. Similarity percentage analysis (SIMPER) was determined by comparing the dissimilarity between two groups of samples using the discriminating species. Geomorphological characteristics, bottom substratum and depth showed direct influences on species assemblages. High correlation between the biotic data samples and depth was observed. The fish species assemblages identified five main demersal fish associations which corresponded with the five location clusters and with five benthic sediments (mud of the upper slope, sand and gravel, mud of the shelf, muddy-sand and sand with rocky outcrops).

scholarly journals Assessing the impact of fisheries on demersal fish assemblages of the Mauritanian continental shelf, 1987–1999, using dominance curves

2005 ◽  
Vol 62 (3) ◽  
pp. 380-383 ◽  
Author(s):  
Didier Jouffre ◽  
Cheikh A. Inejih
Keyword(s):  
Species Composition ◽  
Continental Shelf ◽  
Fish Assemblages ◽  
Demersal Fish ◽  
Octopus Vulgaris ◽  
Taxonomic Information ◽  
Associated Species ◽  
The Impact ◽  
Trawl Surveys

Abstract The assemblages of demersal fish and associated species of the Mauritanian continental shelf are characterized on the basis of annual trawl surveys conducted during the period 1987–1999. Species composition is dominated by exploited species (Dentex spp., Pagellus bellottii, and Octopus vulgaris). Dominance curves (Abundance Biomass Comparison plots) were used to evaluate the impact of fisheries, which have increased in magnitude over several decades. The diagnosis of a “stressed” assemblage seems to converge with the results of a similar study conducted off Senegal, but here there was no trend in impact during the period of study. The sensitivity of the present results to the various ways of considering the available taxonomic information is also analysed.

scholarly journals Analysis of demersal fish assemblages of the Tuscany and Latium coasts (north-western Mediterranean)

2002 ◽  
Vol 66 (S2) ◽  
pp. 233 ◽  
Author(s):  
Franco Biagi ◽  
Paolo Sartor ◽  
Gian Domenico Ardizzone ◽  
Paola Belcari ◽  
Andrea Belluscio ◽  
...  
Keyword(s):  
Species Composition ◽  
Continental Shelf ◽  
Fish Assemblages ◽  
Demersal Fish ◽  
Western Mediterranean ◽  
Similar Species ◽  
The European Union ◽  
The North ◽  
North Western ◽  
Trawl Surveys

A four-year time series (1994-1997) of groundfish trawl surveys performed within the European Union Project MEDITS (Mediterranean International Trawl Surveys), was analysed to identify and describe the fish assemblages along the continental shelf and slope of Tuscany and Latium (Italy), in the north-western Mediterranean. Cluster analysis was used to group samples with similar species composition in terms of abundance, biomass and frequency of occurrence. Results allowed the identification of four to five broad assemblages along the depth gradient: a strictly coastal group (< 50 m depth), two groups in the upper and lower part of the continental shelf (essentially 50-200 m), an epibathyal group (200-450 m) and a group derived from hauls made at depths greater than 450 m. Each assemblage corresponded to a faunistic association with relatively homogeneous and persistent species composition, biomass and density indices.

scholarly journals Long term fish assemblages as units of management in a temperate estuary (Rio de La Plata - SW Atlantic Ocean)

2011 ◽  
Vol 59 (1) ◽  
pp. 43-59 ◽  
Author(s):  
María Inés Lorenzo ◽  
Juan M. Díaz de Astarloa ◽  
Walter Norbis ◽  
María B Cousseau
Keyword(s):  
Continental Shelf ◽  
Fish Assemblages ◽  
Open Systems ◽  
Principal Component ◽  
Demersal Fish ◽  
Rio De La Plata ◽  
Environmental Characteristics ◽  
Río De La Plata ◽  
La Plata ◽  
Inner Continental Shelf

Demersal fish assemblages from trawl surveys in the Rio de la Plata estuary and its inner continental shelf were analyzed from 1975 to 1995. The first two factors of Principal Component Analysis explained 48% of the variance in species distribution, and they are consistent with the results of a cluster analysis. The analysis indicated the existence of three spatially and temporally distinct fish assemblages: internal and external estuarine and inner continental shelf (Uruguayan coastal assemblages). These assemblages were persistent considering the environmental characteristics and their species composition. Despite the changes registered in the species density during the period surveyed, the fish assemblages tend to persist over time. It was demonstrated that the assemblages can be considered as open systems and that there exists a reciprocal flow of organisms between adjacent associations. However, each assemblage showed high spatial and temporal persistence in accordance with the environmental characteristics of the system analyzed. Therefore, and according to the multispecies fisheries operating in the system, each assemblage defined could be considered a unit of management.

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