scholarly journals BOTTOM FAUNA OF LAKE DONUZLAV UNDER CONDITIONS OF INDUSTRIAL SAND MINING

Ekosistemy ◽  
2021 ◽  
pp. 5-22
Author(s):  
N. K. Revkov ◽  
N. A. Boltacheva ◽  
T. N. Revkova ◽  
L. V. Bondarenko ◽  
S. V. Schurov ◽  
...  
Keyword(s):  
Benthic Fauna ◽  
Water Area ◽  
Bottom Fauna ◽  
Sand Mining ◽  
Soft Bottom ◽  
Dominant Group ◽  
Average Abundance ◽  
Local Impact ◽  
Mytilaster Lineatus ◽  
Industrial Sand

In 2019, the composition and quantitative representation of the zoobenthos in Donuzlav Lake, in the area of fine sediment discharge after the sand mining, and in the adjacent water area were studied. The accounting of the macrozoobenthos at the species level and of the meiobenthos at the major taxa level indicates the presence of a typical Pontic bottom fauna in the Lake, which has developed over 58 years of it existence. The benthic macrofauna was represented by a biocoenosis of Chara algae with Mytilaster lineatus, existing in a two-tier biotope – of a soft-bottom and of a Chara algaes developing on it. The epiphyton macrofauna quantitatively dominated the benthic macroinfauna. A total of 102 species and 7 superspecies taxa of the macrozoobenthos were registered in the identified biocoenosis. That increases the overall level of the macrozoobenthos representation up to 171 species and 9 superspecies taxa in Donuzlav for the period since 1981. In meiobenthos 11 taxa in the rank of type were recorded. The abundance and biomass of the macrozoobenthos averaged 34.658±1.655 ind./m2 and 316±93 g/m2 respectively, that is comparable with the previous studies. The average abundance of meiobenthos in the bottom biotope reached 247.2×103 ind./m2. Nematodes were the dominant group in meiobenthos, followed by harpacticids, with a combined share of 81 % in total meiobenthos abundance. The local impact of the discharging finely dispersed soil fractions to the benthic fauna of the southern part of the Donuzlav Lake was revealed. There was a 12, 3.5 and 2-fold decrease in abundance, biomass and number of macrozoobenthos species respectively and a 3.2-fold decrease in meiobenthos abundance, in the discharging area compared to the neighboring water areas of the Lake.

scholarly journals Structure of the macrozoobenthos assemblages in the central part of the northwestern Black Sea shelf (Zernov's Phyllophora field) at the beginning of the 21st century

2021 ◽  
Vol 39 ◽  
pp. 92-108
Author(s):  
Nikolai K. Revkov ◽  
Natalia A. Boltachova
Keyword(s):  
20Th Century ◽  
Black Sea ◽  
Red Algae ◽  
Water Area ◽  
Ecological Crisis ◽  
The Black Sea ◽  
Bottom Fauna ◽  
Soft Bottom ◽  
Northwestern Shelf ◽  
Soft Bottoms

In the first half of the 20th century, there was an extensive biocoenosis of the unattached red algae Phyllophora crispa on the mussel muds of the central section of the Black Sea’s northwestern shelf, which is known as Zernov’s Phyllophora Field (ZPF). At that time, the area of ZPF was approximately 11000 km2. More than a century after the description of ZPF, long-term changes in its phyto- and zoobenthos have been noted. A period of ecological crisis of the Black Sea ecosystem during the second half of the 20th century was destructive for the phytobenthos of ZPF, with the complete degradation of unattached Phyllophora biocoenosis. In contrast, after a sharp decline in the quantitative development of macrozoobenthos of the soft bottoms in the 1970s, its recovery to pre-crisis levels in the 2010s was noted. Despite the difference in the aforementioned phyto- and zoobenthos dynamics, habitat in the 4025 km² area of the botanical sanctuary of national importance “Zernov’s Phyllophora Field” was recognised as Critically Endangered (CR) within the European Red List of Habitats. In this context, the goal of the present study is to clarify the applicability of the CR category to the entire benthic complex of ZPF water area and to assess the current biocoenotic structure and habitat ordination of the zoobenthos on soft bottoms of the ZPF water area in the current conditions of Black Sea de-eutrophication. The obtained results indicate the presence of one biocoenotic complex (Mytilus galloprovincialis) and three subcomplexes in the zoobenthos of ZPF, where the bivalves Mytilaster lineatus, Modiolula phaseolina, as well as Polychaeta are the next most important subcomplex-forming taxa. Throughout all studies of ZPF, relative stability in the biocoenotic representation of the bottom fauna—with the dominance of M. galloprovincialis—has been observed. Due to the current levels of development in both the soft-bottom macrofauna and assemblages of unattached alga Phyllophora, two different habitats were proposed for identification in the water area of the botanical sanctuary. The first habitat – “Aggregations of unattached red algae Phyllophora in the central part of the northwestern shelf of the Black Sea" – was degraded and can be classified as a CR habitat. The second one – “Pontic circalittoral biogenic detritic bottoms with dead or alive mussel beds, shell deposits, with encrusting corallines and attached foliose sciaphilic macroalgae” – represents the soft-bottom biotope and was associated with the biocoenotic complex M. galloprovincialis, proposed for classification as Least Concern. In accordance with three biocoenotic subcomplexes of complex M. galloprovincialis, the spatial position of the three subhabitats was determined on the soft-bottom in the water area of ZPF.

scholarly journals Soft bottom macrofauna of an All Taxa Biodiversity Site: Hornsund (77○N, Svalbard)

2010 ◽  
Vol 31 (4) ◽  
pp. 309-326 ◽  
Author(s):  
Monika Kędra ◽  
Sławomira Gromisz ◽  
Radomir Jaskuła ◽  
Joanna Legeżyńska ◽  
Barbara Maciejewska ◽  
...  
Keyword(s):  
Bottom Fauna ◽  
Sampling Effort ◽  
Biological Traits ◽  
Depth Range ◽  
Concerted Action ◽  
Soft Bottom ◽  
Species List ◽  
Biodiversity Inventory ◽  
Arctic Fjord ◽  
Large Material

Soft bottom macrofauna of an All Taxa Biodiversity Site: Hornsund (77○N, Svalbard) Hornsund, an Arctic fjord in the west coast of Spitsbergen (Svalbard), was selected as All Taxa Biodiversity Inventory (ATBI) site under EU 5th Framework Concerted Action BIOMARE (2000-2002), especially due to its pristine, undisturbed natural character. On the base of large material (89 stations located throughout the fjord and 129 Van Veen grab samples) collected during cruises of RV Oceania in July in 2002, 2003, 2005 and 2007 and literature search a comprehensive list of species recorded within Hornsund area, on the soft bottom with depth range of 30-250 m is provided. Over 220 species were identified including 93 species of Polychaeta, 62 species of Mollusca and 58 species of Crustacea. Species list is supported by information on the zoogeographical status, body length and biological traits of dominant species. Need for further research on Hornsund soft bottom fauna with more sampling effort is highlighted.

Effects of the invasive red king crab (Paralithodes camtschaticus) on soft-bottom fauna in Varangerfjorden, northern Norway

2010 ◽  
Vol 41 (3) ◽  
pp. 467-479 ◽  
Author(s):  
Eivind Oug ◽  
Sabine K. J. Cochrane ◽  
Jan H. Sundet ◽  
Karl Norling ◽  
Hans C. Nilsson
Keyword(s):  
Bottom Fauna ◽  
Red King Crab ◽  
Paralithodes Camtschaticus ◽  
Soft Bottom ◽  
King Crab ◽  
Northern Norway

scholarly journals SEASONAL BIOLOGICAL WATER QUALITY ASSESSMENT OF RIVER KSHIPRA USING BENTHIC MACRO-INVERTEBRATES

2015 ◽  
Vol 3 (9SE) ◽  
pp. 1-7
Author(s):  
Akhand Archna ◽  
Shrivastava Sharad ◽  
Akhand Pratibha
Keyword(s):  
Water Quality ◽  
River Water ◽  
Benthic Fauna ◽  
Water Quality Assessment ◽  
Seasonal Abundance ◽  
Dominant Group ◽  
Biological Water ◽  
Water Quality Status ◽  
Biological Water Quality

The water quality of River Kshipra in stretch of 195 km was studied for water quality status using benthic macro invertebrates for all three seasons’ monsoon, winter and summer. The River water quality is subject to severe domestic and industrial pollution at compete stretch of River. In the present investigation a total of 13 Orders of macrobenthic fauna i.e. Ephemeroptera, Trichoptera, Placoptera, Coleoptera, Hemiptera, Odonata, Crustacea, Diptera, Pulmonata, Operculata, Pulmonata, Oligochaeta and Hirudinea belong to 3 Phylum’s Arthropoda, Mollusca and Annelida were reported. Arthropoda was the most dominant group in all seasons. On seasonal comparison of benthic fauna is observe that abundance were decreasing order were, Winter > Monsoon > summer. To monitor the water quality samples from two years (2010-12) from different stations were collected monthly. The works highlighted the condition of the River water in various seasons with respect of the seasonal abundance of the benthic macro-invertebrates organisms mentioned above.

scholarly journals Macrozoobenthos in an altitudinal gradient in North Patagonian Cautín River (Araucanía Region, Chile)

2022 ◽  
Vol 82 ◽  
Author(s):  
D. Figueroa ◽  
P. De los Rios-Escalante
Keyword(s):  
Water Quality ◽  
Sampling Site ◽  
Benthic Fauna ◽  
Distribution Patterns ◽  
Macroinvertebrate Communities ◽  
Cultural Activity ◽  
Dissolved Oxygen Concentration ◽  
Dominant Group ◽  
Altitudinal Distribution ◽  
Water Quality Indicators

Abstract The Cautín River is closely related with the economic development of Temuco city, (38°S; Chile). Existing knowledge of the Cautín River is limited to information about its biological characteristics as a reference for the evaluation and assessment of water quality. The object of this study was to develop taxonomic characterisation of the benthic macroinvertebrates along the main course of the Cautín River, and to study the community structure using correlation analysis between community parameters. To carry out this research, the macroinvertebrate community was studied in 10 sampling sites distributed along the main course of the river. The samples were taken in summer (1997 and 2000), when optimal hydrological conditions existed. Analysis of the samples showed that the benthic fauna was composed of 56 taxa, the dominant group being insects with 48 taxa. Three main sectors were recognised in the course of the Cautín River: high, middle and low. Each sector has restricted-distribution species, while other species are widely distributed along the river. These distribution patterns seem to be influenced by dissolved oxygen concentration, temperature, altitudinal distribution and anthropo-cultural activity, present at every sampling site. Finally, this research provides a first approach to the biology of the Cautín River. Further studies could be planned on the basis of this knowledge to investigate water quality indicators based on macroinvertebrate communities.

Taxonomic structure of the zoobenthos of the Lukoml GRES cooling reservoir

2021 ◽  
Vol 66 (2) ◽  
pp. 194-204
Author(s):  
I. I. Lapuka ◽  
V. V. Vezhnavets
Keyword(s):  
Water Discharge ◽  
Taxonomic Diversity ◽  
Water Area ◽  
District Power Station ◽  
Bottom Fauna ◽  
Taxonomic Structure ◽  
Power Station ◽  
Relict Species ◽  
Macrobrachium Nipponense ◽  
Cooling Reservoir

The species composition of zoobenthos in the heated and non-heated zones of the cooling lake Lukoml State District Power Station was studied. 80 taxa of bottom animals have been registered, and two new species of chironomid larvae have been identified. The bottom fauna includes a protected relict species of Pallaseopsis qudrispinosa, which is preserved in the conditions of warming.it is listed in the Red book of Belarus and the alien species – freshwater shrimp Macrobrachium nipponense. The high taxonomic diversity indicates that the Lukoml State District Power Station operation has little impact on the bottom community throughout the lake’s water area. However, species richness is reduced locally by half in the zone of influence of heated water discharge, especially in summer. Under the influence of heating, the taxonomic structure and spatial distribution at different depths change.

Distribution of benthic fauna in sediment grains and prop roots of a mangrove channel in south-eastern Brazil

2016 ◽  
Vol 97 (2) ◽  
pp. 377-385 ◽  
Author(s):  
Debora De Souza Silva-Camacho ◽  
Rafaela De S. Gomes ◽  
Joaquim N.S. Santos ◽  
Francisco Gerson Araújo
Keyword(s):  
Benthic Fauna ◽  
Fine Sand ◽  
Abundant Species ◽  
High Abundance ◽  
Dominant Group ◽  
Medium Sand ◽  
Spatial Partitioning ◽  
South Eastern ◽  
Eastern Brazil ◽  
Different Types

We examined the benthic fauna in four areas along a mangrove tidal channel in south-eastern Brazil, between October 2008 and August 2009. The tested hypothesis is that the most abundant groups avoid competition as they occupy different types of substrata and that the longitudinal distance from the sea also affects the occurrence of benthic fauna along the channel. We also examined the prop root epibiont fauna to describe this different community. Polychaeta was the dominant group in the sediment whereas Isopoda and Tanaidacea were the dominant groups on the prop roots. We found a tendency for higher infauna species richness and diversity in the innermost channel area during the summer. Higher abundance of epibiont fauna was also found in summer with tidal movements allowing the colonization of the prop roots of the mangrove forest by some taxa. The polychaetes Ceratocephale sp. and Laeonereis acuta had indication of habitat partitioning, with the first occurring mainly in very fine sand sediment whereas the latter preferred medium sand sediment. The microcrustaceans Chelorchestia darwini and Tanaidacea sp. 1 occurred in high abundance colonizing the prop roots. Exosphaeroma sp. was found in high abundance in infauna and epibiont fauna. The tested hypothesis of spatial partitioning of the mangrove channel by the benthic fauna was confirmed with the most abundant species occupying the substrata with different grain fractions and prop roots in different stations.

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