scholarly journals Interactions in soft bottom benthic communities: Quantitative aspects of behaviour in the surface deposit feedersPygospio elegans (Polychaeta) andMacoma balthica (Bivalvia)

1991 ◽  
Vol 45 (3) ◽  
pp. 301-316 ◽  
Author(s):  
Thomas Brey
Keyword(s):  
Benthic Communities ◽  
Soft Bottom ◽  
Surface Deposit

Description of three new species of Ampelisca (Crustacea: Amphipoda: Ampeliscidae) from Southwestern Atlantic, with a key of the genus for Brazilian species

Zootaxa ◽  
2007 ◽  
Vol 1626 (1) ◽  
pp. 25-37 ◽  
Author(s):  
MARIA TERESA VALÉRIO-BERARDO
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
Continental Shelf ◽  
Benthic Communities ◽  
Brazilian Coast ◽  
Southwestern Atlantic ◽  
Soft Bottom ◽  
Brazilian Species ◽  
Southwestern Atlantic Ocean ◽  
Three New Species

Ampelisca species are inhabitant of soft bottom marine benthic communities of tropical to cold – temperate zones. Prior to this paper, 11 species of the genus were recognized from Brazilian coast. Three new species of Ampelisca are herein described: Ampelisca longipropoda, Ampelisca meridionalis and Ampelisca youngi. The specimens were dredged from the continental shelf of Southwestern Atlantic Ocean between the latitudes 22°06’S and 34°32’S. A key to the Ampelisca species of the Brazilian coast is provided.

scholarly journals Effects of two offshore gas platforms on soft-bottom benthic communities (northwestern Adriatic Sea, Italy)

2010 ◽  
Vol 70 (5) ◽  
pp. 402-410 ◽  
Author(s):  
Sarine Manoukian ◽  
Alessandra Spagnolo ◽  
Giuseppe Scarcella ◽  
Elisa Punzo ◽  
Roberta Angelini ◽  
...  
Keyword(s):  
Adriatic Sea ◽  
Benthic Communities ◽  
Soft Bottom

scholarly journals Decapod crustaceans associated with an artificial reef (Adriatic Sea)

2013 ◽  
Vol 14 (3) ◽  
pp. 64 ◽  
Author(s):  
A. SANTELLI ◽  
E. PUNZO ◽  
G. SCARCELLA ◽  
P. STRAFELLA ◽  
A. SPAGNOLO ◽  
...  
Keyword(s):  
Species Richness ◽  
New Species ◽  
Adriatic Sea ◽  
Benthic Communities ◽  
Natural Habitat ◽  
Artificial Reef ◽  
Artificial Substrates ◽  
Decapod Crustaceans ◽  
Soft Bottom ◽  
Abundance And Diversity

The aim of this study is to increase the knowledge on the distribution of decapod crustaceans associated with an artificial reef positioned on sandy-mud bottoms in the central Adriatic Sea. The reef is constituted of concrete modules assembled in pyramids and concrete poles. Hard and soft bottom samples were collected from 2001, just after reef construction, to 2005 (4 surveys per year). Regarding the soft seabed, three sites close to a pyramid, three inside the reef area at a distance of 10-15 m from the structures, and three 200 m outside the reef (control sites) were randomly sampled during each survey. At the same time, three pyramids (vertical and horizontal walls) and three poles were also investigated. After taxonomical analysis, decapod crustaceans were analysed using abundance and species richness. Sites and years were compared using a balanced, fixed effect, 2-way ANOVA and PERMANOVA. In addition, SIMPER analysis was performed to identify those species typifying each community inhabiting both the soft bottom and the artificial substrates. The results showed that the artificial reef induced an increase in both abundance and diversity of the decapods of the natural habitat. In fact, man-made substrates may offer new available space for biological colonization and allow the settlement of new species usually living on hard bottoms, thus increasing the complexity of the original benthic communities.

Impacts of sedimentation on soft-bottom benthic communities in the southern islands of Singapore

Hydrobiologia ◽  
2004 ◽  
Vol 515 (1-3) ◽  
pp. 91-106 ◽  
Author(s):  
L.M. Chou ◽  
J.Y. Yu ◽  
T.L. Loh
Keyword(s):  
Benthic Communities ◽  
Soft Bottom

Seascape of Soft Bottom Benthic Communities in the Aegean Sea

2022 ◽  
Author(s):  
Christina Pavloudi ◽  
Eva Chatzinikolaou ◽  
Kleoniki Keklikoglou ◽  
Katerina Vasileiadou ◽  
Christos Arvanitidis
Keyword(s):  
Benthic Communities ◽  
Aegean Sea ◽  
Soft Bottom

scholarly journals Historical Shifts in Benthic Infaunal Diversity in the Northern Gulf of Mexico since the Appearance of Seasonally Severe Hypoxia

Diversity ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 49
Author(s):  
Nancy N. Rabalais ◽  
Melissa M. Baustian
Keyword(s):  
Species Richness ◽  
Dissolved Oxygen ◽  
Bottom Water ◽  
Benthic Communities ◽  
Penaeid Shrimp ◽  
Severe Hypoxia ◽  
Low Oxygen ◽  
Large Area ◽  
Surface Deposit ◽  
Deposit Feeders

Severe and persistent bottom-water hypoxia (≤2 mg O2 L−1) occurs on the Louisiana/Texas continental shelf from mid-May through mid-September over a large area (up to 23,000 km2 in mid-summer). Benthic infauna are less mobile than demersal organisms and become stressed by the low dissolved oxygen; benthic community composition, abundance, diversity, and biomass become altered. From the 1950s to the early 1970s, when sediment core indicators identified the initiation and subsequent worsening of dissolved oxygen conditions, there were no hydrographic data or benthic infaunal studies within the current area of frequent bottom-water hypoxia. This study highlights the impacts of severe hypoxia on benthic macroinfaunal communities and how they may have changed from less-hypoxic periods. Polychaetes were and are the dominant taxa in the available studies, but polychaete species richness in summer is now curtailed severely beginning with our 1985–1986 data. Species richness of polychaetes in summer hypoxia (1985–1986 and 1990–1991) was about 60% less than comparable taxa in 1972–1973. Abundance of polychaetes was much less in summer than spring, and recent infaunal biomass in summer was only 15% of what was found in spring. The result is less prey for demersal penaeid shrimp and fishes. Over the period of our comparison, infaunal feeding modes shifted from subsurface deposit feeders and surface deposit feeders to primarily surface deposit feeders (i.e., 95.5% of all polychaetes). Most were opportunistic, hypoxia tolerant, and recruited in high numbers following hypoxia abatement, some in fall and winter but most in spring. As benthic communities succumb to the stress of severe and continued seasonal low oxygen, they occupy the few upper centimeters of the sediment profile above the redox discontinuity layer with negative feedbacks to the water column by way of altered biogeochemical processes.

Distribution and abundance of soft-bottom molluscs in Port Phillip Bay, Victoria, Australia

1974 ◽  
Vol 25 (3) ◽  
pp. 371 ◽  
Author(s):  
GCB Poore ◽  
S Rainer
Keyword(s):  
Distribution Patterns ◽  
Sediment Type ◽  
Soft Bottom ◽  
Surface Deposit ◽  
Suspension Feeders ◽  
Feeding Types ◽  
Marginal Areas ◽  
Feeding Type ◽  
Faunal Density ◽  
Main Determinants

The distribution of soft-bottom molluscs of Port Phillip Bay, Vic., is examined in terms of abundance, the distribution of feeding types and patterns of diversity, and related to environmental variables such as depth and sediment type. Six feeding types were distinguished among the 105 species collected. Infaunal suspension feeders dominated in marginal sandy substrates while surface deposit feeders dominated in the silt and clay sediments of the Central region and Corio Bay. Epifaunal suspension feeders, grazers, scavengers and predators were less abundant and were seldom dominant. Numbers of individuals and species, and diversity, varied widely but were generally higher in marginal areas. Four areas of the Bay were recognized on the basis of similarities in distribution patterns, the distribution of species numbers, of diversity and of the dominant feeding type: the Nepean sand banks, the deep water Central and Corio regions, marginal areas, and the shallow seagrass sand flats. The main determinants of mollusc distributions were substrate and food supply, while purely hydrological effects were limited to nearshore areas. Regional differences in diversity were related to sample size by correlation and regression; low faunal density caused diversity in the Exchange region to be considerably underestimated.

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