Composition and distribution of suprabenthic fauna in the south-eastern Weddell Sea and off King George Island

2002 ◽  
Vol 14 (1) ◽  
pp. 3-10 ◽  
Author(s):  
Katrin Linse ◽  
Angelika Brandt ◽  
Brigitte Hilbig ◽  
Gisela Wegener
Keyword(s):  
Relative Abundance ◽  
Water Depth ◽  
Weddell Sea ◽  
Total Abundance ◽  
King George Island ◽  
The South ◽  
South Eastern ◽  
Epibenthic Sledge ◽  
Abundance And Distribution ◽  
Eastern Weddell Sea

Composition, abundance, and distribution of suprabenthos from a depth between 1 and 1.33 m above the seafloor were analysed. The samples were taken during ANT XV/3 with RV Polarstern in February and March 1998 by means of the supranet of an epibenthic sledge along two transects in the southern Weddell Sea (Vestkapp and Halley Bay) and one east of King George Island. At each of these three transects, five to six stations were taken in water depth between 200 and 2000 m. In total, 34 057 specimens were sampled at 16 stations, yielding 1 205 050 individuals for all stations standardized to 1000 m3 hauls. Of these, copepods were usually the most abundant group in the supranet (805 822 ind 1000 m−3. The suprabenthic fauna of the southwest of Vestkapp (Weddell Sea) transect was dominated by planktonic taxa in terms of individual numbers especially at the deeper stations (938–1983 m). At Halley Bay the total abundance of plankton was lower but its relative abundance (> 80%) was also high, whilst off King George Island peracarid crustaceans were an important fraction.

The role of tides on the carbonate chemistry of a coastal polynya in the south-eastern Weddell Sea

2021 ◽  
Author(s):  
Elise Droste ◽  
Melchor González Dávila ◽  
Juana Magdalena Santana Casiano ◽  
Mario Hoppema ◽  
Gerd Rohardt ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Weddell Sea ◽  
Water Masses ◽  
Total Alkalinity ◽  
The South ◽  
Carbonate Chemistry ◽  
Large Variability ◽  
South Eastern ◽  
Coastal Polynya ◽  
Eastern Weddell Sea

<p>Tides have a large impact on coastal polynyas around Antarctica. We investigate the effect of semi-diurnal tidal cycles on the seawater carbonate chemistry in a coastal polynya hugging the Ekström Ice Shelf in the south-eastern Weddell Sea. This region experiences some of the strongest tides in the Southern Ocean. We assess the implications for the contribution of coastal polynyas to the carbon dioxide (CO<sub>2</sub>) air-sea flux of the Weddell Sea.</p><p>Two site visits, in January 2015 and January 2019, are intercompared in terms of the dissolved inorganic carbon (DIC) concentration, total alkalinity, pH, and CO<sub>2</sub> partial pressure (pCO<sub>2</sub>). The tides induce large variability in the carbonate chemistry of the coastal polynya in the austral summer: DIC concentrations vary between 2174 and 2223 umol kg<sup>-1</sup>.</p><p>The tidal fluctuation in the DIC concentration can swing the polynya from a sink to a source of atmospheric CO<sub>2 </sub>on a semi-diurnal timescale. We attribute these changes to the mixing of different water masses. The amount of variability induced by tides depends on – and is associated with – large scale oceanographic and biogeochemical processes that affect the characteristics and presence of the water masses being mixed, such as the rate of sea ice melt.</p><p>Sampling strategies in Antarctic coastal polynyas should always take tidal influences into account. This would help to reduce biases in our understanding of how coastal polynyas contribute to the CO<sub>2</sub> uptake by the Southern Ocean.</p>

Spatial distribution of Antarctic shrimps (Crustacea: Decapoda) by underwater photography

1991 ◽  
Vol 3 (4) ◽  
pp. 363-369 ◽  
Author(s):  
Julian Gutt ◽  
M. Gorny ◽  
W. Arntz
Keyword(s):  
Spatial Distribution ◽  
Continental Shelf ◽  
Weddell Sea ◽  
Small Scale ◽  
Frequency Distributions ◽  
South Eastern ◽  
Direct Observations ◽  
Underwater Photography ◽  
Dispersion Patterns ◽  
Eastern Weddell Sea

Three species of shrimps (Notocrangon antarcticus, Chorismus antarcticus, Nematocarcinus lanceopes) were investigated in the south-eastern Weddell Sea using of underwater photography. Maximum densities of c. 100 specimens per 100 m2 were found for N. antarcticus on the continental shelf (200–600 m) and for N. lanceopes on the slope (800–1200 m). Small-scale dispersion patterns and size-frequency distributions were analyzed within dense concentrations. These direct observations indicate that the behaviour of the three species is adapted to different habitats with Chorismus distribution correlated with that of sponges and Notocrangon with base sediment.

Abundance, diversity, and community patterns of Isopoda (Crustacea) in the Weddell Sea and in the Bransfield Strait, Southern Ocean

2004 ◽  
Vol 16 (1) ◽  
pp. 5-10 ◽  
Author(s):  
ANGELIKA BRANDT
Keyword(s):  
Species Richness ◽  
Southern Ocean ◽  
Water Layer ◽  
Weddell Sea ◽  
King George Island ◽  
Community Patterns ◽  
Bransfield Strait ◽  
Epibenthic Sledge ◽  
Higher Taxa

Abundance, diversity, and distribution of suprabenthic Isopoda caught from a water layer between 0.27 to 0.60 m above the seafloor were analysed. The samples were taken during the ANT XV/3 cruise on RV Polarstern by means of an epibenthic sledge along two transects in the southern Weddell Sea (Vestkapp and Halley Bay) and another one east of King George Island. At each of these three bathymetric transects, five to six stations were sampled between 200 and 2000 m. In total, 4258 specimens of isopods were sampled at 14 stations standardized to 1000 m2 hauls. 114 species were identified from 49 genera and 23 higher taxa (families and suborders) of Isopoda. Most of them belonged to the suborder Asellota. Dominant families are Munnopsididae (Eurycopinae, Ilyarachninae), Joeropsidae, Munnidae, Paramunnidae, Ischnomesidae and Desmosomatidae. No striking differences were found between areas (Vestkapp, Halley Bay, Kapp Norvegia, and Bransfield Strait). Overall isopod abundances were highest at the shallowest station; species richness was slightly higher above 1000 m depth.

scholarly journals FEATURES OF ECOLOGY AND BIOTOPIC DISTRIBUTION OF RODENTS ON THE SOUTH-EASTERN SLOPE OF THE BOGOS RIDG

2020 ◽  
pp. 18-22
Author(s):  
Kamil Zubairovich OMAROV
Keyword(s):  
Species Composition ◽  
Relative Abundance ◽  
Eastern Slope ◽  
The South ◽  
Biotopic Distribution ◽  
South Eastern ◽  
Wide Range

As part of the inventory work in the Kosobsko-Keleb Reserve in 2017–2019, the species composition was identified and the relative abundance of rodents on the south-eastern slope of the Bogos ridge was estimated. It is shown that rodents inhabit a fairly wide range of biotopes on the south-eastern slope of the Bogos ridge, which is largely predetermined by the peculiarities of their ecology and the nature of their specialization.

scholarly journals Effects of depth and season on catch volume of bottom gillnets employed along the Fatsa coasts of the South-eastern Black Sea

2020 ◽  
Vol 37 (2) ◽  
pp. 187-194 ◽  
Author(s):  
İsmet BALIK
Keyword(s):  
Black Sea ◽  
Fish Species ◽  
Water Depth ◽  
Horse Mackerel ◽  
Shallow Waters ◽  
The South ◽  
Summer Period ◽  
South Eastern ◽  
Water Layers ◽  
Merlangius Merlangus

The study was conducted along the Fatsa coasts of the South-eastern Black Sea, to investigate the effects of depth and season on catch volume of the bottom gillnet fishery. During the study, fishing was carried out using multifilament gillnets with mesh sizes of 32, 34, 36 and 38 mm in each of the four different depth strata (0-14 m, 15-29 m, 30-49 m and ≥50 m) three times per month between March 2013 and February 2014 (except for July and August), with a total of 30 gillnet hauls performed. The results of the study revealed that in all seasons whiting (Merlangius merlangus) was caught most in the 30 m and deeper water layers. However, whiting catch increased with increasing water depth. Most red mullets (Mullus barbatus) were caught in the 0-14 m depth waters during spring, winter and autumn periods, while its catch was the greatest in the 15-29 m during the summer period. Catch of this species decreased gradually with increasing water depth. Another fish species was pontic shad (Alosa immaculata) which was caught least in the shallow waters. However, during all seasons its catch increased gradually with increasing water depth up to the 30-49 m depth strata. Nevertheless, it was determined that catch volume for this species decreased in the ≥50 m level again. On the other hand, Mediterranean horse mackerel (Trachurus mediterraneus) was mostly caught in the shallow waters (0-14 m and 15-29 m) during all seasons. Especially in the ≥50 m waters, no Mediterranean horse mackerel was sampled during the study. This study presents that amounts of catch for the fish species sampled were affected especially by water depth and seasons.

Studies of the Ground-Dwelling Mammals of Eucalypt Forests in South-Eastern New South Wales: the Effect of Habitat Variables on Distribution and Abundance.

1995 ◽  
Vol 22 (3) ◽  
pp. 271 ◽  
Author(s):  
PC Catling ◽  
RJ Burt
Keyword(s):  
Relative Abundance ◽  
New South ◽  
New South Wales ◽  
Basal Area ◽  
Vegetation Communities ◽  
South Eastern ◽  
South Wales ◽  
Eucalypt Forests ◽  
Abundance And Distribution ◽  
Habitat Variables

The distribution and abundance was studied of ground-dwelling mammals in 13 areas within 500 000 ha of eucalypt (Eucalyptus spp.) forest in south-eastern New South Wales. Data are presented on the relative abundance and distribution of mammals in relation to the complexity of the habitat of the vegetation communities, basal area of the trees, and indices of nutrients in the foliage of the trees.

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