scholarly journals STUDY OF ECOSYSTEM OF THE SUKHUM BAY WITH EMPHASIS ANTHROPOGENIC IMPACT, ABKHAZIAN BLACK SEA COAST

2019 ◽  
Vol 22 ◽  
pp. 108-116
Author(s):  
Zhanna P. Selifonova ◽  
Pavel R. Makarevich ◽  
Ernest Z. Samyshev ◽  
Levard M. Bartsits
Keyword(s):  
Alien Species ◽  
Black Sea ◽  
Benthic Communities ◽  
Nutrient Status ◽  
Common Species ◽  
Indigenous Species ◽  
Macrophyte Community ◽  
Non Indigenous Species ◽  
Sea Area ◽  
First Time

For the first time in thirty years, baseline comprehensive studies plankton and zoobenthos of the Sukhum Bay were conducted and an assessment of its current environmental status was given. The summer phytoplankton abundance of the port of Sukhum was represented mainly by coccolithophorids  Emiliania huxleyi and diatoms algae, among the latter, the common species in polluted or eutrophic brackish waters were recorded. The presence of euglenic algae and cyanobacteria indicates a higher nutrient status, pollution and desalination of the sea area. The alien species Peridinium quinquecorne Abé (Dinophyceae) was recorded in the Abkhazian coastal waters for the first time. Totally, 7 species of tintinnids  belonging to 3 genera Favella, Tintinnopsis, Eutintinnus were established from the Sukhum Bay. Among them, the non-indigenous species Eutintinnus  tubulosus and E. apertus were noticed. Tintinnid ciliates accounted for ca. 5% of total ciliates abundance. The values of the abundance of aloricated ciliates were comparable to the values obtained  from offshore of bays and ports of the northeastern Black Sea. As the pressure of predators is reduced the well-pronounced peaks of holo- and meroplankton biomass were recorded in the last summer – early autumn. A significant part of total holoplankton biomass – 66.5 % (up to 1.1 g/m3) was composed of cladocerans  Penilia avirostris. The  meroplankton was dominated by larvae of bivalve mollusks Mytilaster lineatus,  polychaetes Polydora cornuta and cirripede barnacle Amphibalanus improvisus. The number of meroplankton in the open Sukhum port was 10–15 times lower above than a level of values obtained for ports and bays of the northeastern Black Sea. Among ichthyoplankton, the dominant species were Mullus barbatus ponticus, Diplodus annularis, Trachurus mediterraneus, Engraulis encrasicholus and Sciena umbra. Mean abundance of ichthyoplankton in vertical catches was 5–10 times lower than in offshore of Anapa and Gelendzhik of the northeastern Black Sea. And the proportion of dead eggs was 2 – 3 times higher than areas of these resort cities. The composition of macrozoobenthos was drastically depleted and resembled that of the polluted port complexes of the northeastern Black Sea. Heteromastus association  dominated in mud bottom sediments. Among spionid polychaetes, the worst invaders Streblospio gynobranchiata and Polydora cornuta have been recorded in soft bottom communities. Depletion of benthic communities, loss from the structure of the trophic web of the macrophyte community and appearance of cyanobacteria and a new alien species in the planktonic and benthic communities leads inevitably to imbalance of the structure of the Sukhum port ecosystem.

scholarly journals Further dispersion of the invasive alien species Corbicula fluminea (O. F. Müller, 1774) in the Oder River

2019 ◽  
pp. 14 ◽  
Author(s):  
Klaudia D. Cebulska ◽  
Mariola Krodkiewska
Keyword(s):  
Alien Species ◽  
Water Channel ◽  
Corbicula Fluminea ◽  
Freshwater Ecosystems ◽  
Indigenous Species ◽  
Vistula River ◽  
New Findings ◽  
Oder River ◽  
Non Indigenous Species ◽  
First Time

Corbicula fluminea is recognised as being one of the worst alien species in Europe and one of the world's most widespread non-indigenous species in freshwater ecosystems. In Poland, it was detected in a heated water channel of the Lower Oder Power Station near Szczecin for the first time in 2003. In the following years, it continued its spread in the Oder River and the Vistula River. Our study uncovered new findings of C. fluminea in the Upper Oder River, which are its southernmost localities in the Oder River. Its record in the Gliwice Canal indicates that this may be a new dispersion route to the east for this species.

scholarly journals First Record of the Alien Species Procambarus virginalis Lyko, 2017 in Fresh Waters of Sardinia and Insight into Its Genetic Variability

Life ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 606
Author(s):  
Daria Sanna ◽  
Ilenia Azzena ◽  
Fabio Scarpa ◽  
Piero Cossu ◽  
Angela Pira ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Alien Species ◽  
Procambarus Clarkii ◽  
Mitochondrial Gene ◽  
First Record ◽  
Indigenous Species ◽  
Fresh Waters ◽  
Mediterranean Island ◽  
Marbled Crayfish ◽  
Non Indigenous Species

In the fresh waters of Sardinia (Italy), the non-indigenous crayfish species Procambarus clarkii has been reported from 2005, but, starting from 2019, there have been several reports of a new non-indigenous crayfish in southern and central areas of this Mediterranean island, and its morphology suggests that this species may be the marbled crayfish Procambarus virginalis. Forty-seven individuals of this putative species were analyzed, using the mitochondrial gene Cytochrome c Oxidase subunit I as molecular marker to identify this crayfish and investigate the level of genetic variability within the recently established population. Phylogenetic and phylogeographic analyses were carried out on a dataset including sequences from the Sardinian individuals and from all congenerics available in GenBank. Results showed that the new Sardinian crayfish belong to the species P. virginalis. All the sequences belonging to P. virginalis from European countries are identical, with only few exceptions found among Sardinian individuals. In conclusion, this paper highlights the occurrence of a new further alien species in the Sardinian fresh waters, which are already characterized by the high presence of non-indigenous species.

scholarly journals Variability in the settlement of non-indigenous species in benthic communities from an oceanic island

2018 ◽  
Vol 72 (1) ◽  
Author(s):  
Léa Riera ◽  
Patrício Ramalhosa ◽  
João Canning-Clode ◽  
Ignacio Gestoso
Keyword(s):  
Benthic Communities ◽  
Oceanic Island ◽  
Indigenous Species ◽  
Non Indigenous Species

scholarly journals Key Drivers for Copepod Assemblages in a Eutrophic Coastal Brackish Lake

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 363 ◽  
Author(s):  
Neila Annabi-Trabelsi ◽  
Gamal El-Shabrawy ◽  
Mohamed E. Goher ◽  
Madhavapeddi N. V. Subrahmanyam ◽  
Yousef Al-Enezi ◽  
...  
Keyword(s):  
Nile Delta ◽  
Acartia Tonsa ◽  
Copepod Species ◽  
Indigenous Species ◽  
Coastal Lake ◽  
Brackish Lake ◽  
Identification Of Species ◽  
Key Drivers ◽  
Non Indigenous Species ◽  
First Time

The copepod assemblages and abiotic parameters were investigated at 11 stations in a large coastal lake (Lake Manzalah, Nile Delta) from 2009–2010 in order to verify any impacts of eutrophication and salinity on the copepod species composition. The environmental conditions and the copepod assemblages appeared to have changed in comparison with previous studies, possibly because of increasing eutrophication and invasions of non-indigenous species (NIS). The aim of the present study was the identification of species which can be used as ecological indicators of high trophic status. Among the nine copepod species of Lake Manzalah, Acartia tonsa, Mesocyclops ogunnus, and Apocyclops panamensis were reported for the first time. Acartia tonsa, a well-known NIS for the Mediterranean, numerically dominated the copepod assemblages in some portions of the lake. The distribution of Acanthocyclops trajani and Thermocyclops consimilis was insensible to eutrophication because they can stand high levels of nutrients and hypoxia. Compared with previous reports, the copepod assemblage of Lake Manzalah was richer in species. The invasions of NIS, in addition to the heterogeneous progress of eutrophication in the lake, created an environmental mosaic with many species in total, but with single areas suitable for only a small number of them.

scholarly journals Disturbance, colonization and development of Antarctic benthic communities

2006 ◽  
Vol 362 (1477) ◽  
pp. 11-38 ◽  
Author(s):  
David K.A Barnes ◽  
Kathleen E Conlan
Keyword(s):  
Temperature Stress ◽  
Benthic Communities ◽  
Larval Abundance ◽  
Indigenous Species ◽  
Benthic Organisms ◽  
Community Recovery ◽  
Sea Floor ◽  
Wind Speeds ◽  
Non Indigenous Species ◽  
The Antarctic

A decade has yielded much progress in understanding polar disturbance and community recovery—mainly through quantifying ice scour rates, other disturbance levels, larval abundance and diversity, colonization rates and response of benthos to predicted climate change. The continental shelf around Antarctica is clearly subject to massive disturbance, but remarkably across so many scales. In summer, millions of icebergs from sizes smaller than cars to larger than countries ground out and gouge the sea floor and crush the benthic communities there, while the highest wind speeds create the highest waves to pound the coast. In winter, the calm associated with the sea surface freezing creates the clearest marine water in the world. But in winter, an ice foot encases coastal life and anchor ice rips benthos from the sea floor. Over tens and hundreds of thousands of years, glaciations have done the same on continental scales—ice sheets have bulldozed the seabed and the zoobenthos to edge of shelves. We detail and rank modern disturbance levels (from most to least): ice; asteroid impacts; sediment instability; wind/wave action; pollution; UV irradiation; volcanism; trawling; non-indigenous species; freshwater inundation; and temperature stress. Benthic organisms have had to recolonize local scourings and continental shelves repeatedly, yet a decade of studies have demonstrated that they have (compared with lower latitudes) slow tempos of reproduction, colonization and growth. Despite massive disturbance levels and slow recolonization potential, the Antarctic shelf has a much richer fauna than would be expected for its area. Now, West Antarctica is among the fastest warming regions and its organisms face new rapid changes. In the next century, temperature stress and non-indigenous species will drastically rise to become dominant disturbances to the Antarctic life. Here, we describe the potential for benthic organisms to respond to disturbance, focusing particularly on what we know now that we did not a decade ago.

Three non-indigenous species ofAoroides(Crustacea: Amphipoda: Aoridae) from the French Atlantic coast

2015 ◽  
Vol 96 (8) ◽  
pp. 1651-1659 ◽  
Author(s):  
Benoit Gouillieux ◽  
Nicolas Lavesque ◽  
Jean-Charles Leclerc ◽  
Vincent Le Garrec ◽  
Frédérique Viard ◽  
...  
Keyword(s):  
Zostera Marina ◽  
Atlantic Coast ◽  
Indigenous Species ◽  
Oyster Reefs ◽  
Marine Waters ◽  
Arcachon Bay ◽  
Bay Of Brest ◽  
Non Indigenous Species ◽  
First Time ◽  
Sw France

The amphipod genusAoroidesis reported for the first time in European marine waters. Specimens ofAoroides semicurvatusandAoroides curvipeswere collected in oyster reefs in Arcachon Bay between 2009 and 2014 and in Hossegor Lake in 2014 (SW France). Specimens ofAoroides longimeruswere collected in 2013 and 2014 in subtidal slipper limpet beds andZostera marinameadows in Arcachon Bay and in 2014 on floating pontoons in the Bay of Brest (W France). These species, native to Asia, may have been accidentally introduced in Arcachon Bay and Hossegor Lake with oyster transfers and in the Bay of Brest through both oyster transfers and shipping.

scholarly journals Are there Invasive Planktonic Microbes?

2019 ◽  
Vol 2 (2) ◽  
Keyword(s):  
Natural Population ◽  
Human Activities ◽  
Environmental Changes ◽  
Common Species ◽  
Species Level ◽  
Indigenous Species ◽  
Introduced Populations ◽  
Interannual Fluctuations ◽  
Non Indigenous Species ◽  
Gymnodinium Catenatum

The translocation of species by human activities is a problem that increases with the globalization. However, the examples of non-indigenous or exotic planktonic microbes can be questioned as they predominantly have cosmopolitan distributions and natural mechanisms for wide dispersion. In reality, the categorization of any species as non-indigenous requires solving two difficult issues: knowledge of where the ‘natural’ population is, and demonstration of a substantial geographic discontinuity between the supposed source and the introduced populations. With regard to planktonic microorganisms, a non-indigenous taxon could have been previously unnoticed during routine microscopical analyses due to: A) difficult identification at the species level in routine observations such as for the diatoms (Pseudo-nitzschia, Skeletonema, Thalassiosira, Pleurosigma), unarmoured dinoflagellates (Karenia, Karlodinium) and Raphidophytes, and B) species with strong interannual fluctuations of abundance, only detected during bloom periods when they are misinterpreted as newcomers (i.e., Coscinodiscus wailesii or Trieres chinensis, junior synonyms of C. cylindricus and T. regia, respectively, or Gymnodinium catenatum). Rather than attempting to add to the lists of non-indigenous species with planktonic microbes, the monitoring surveys should also pay attention in the less common species with important fluctuations of abundance, independent of tentative labels as exotic or indigenous, because they are potentially useful as bio-indicators of environmental changes.

scholarly journals Biotic effects during the settlement process of non-indigenous species in marine benthic communities

2018 ◽  
Vol 13 (2) ◽  
pp. 247-259 ◽  
Author(s):  
Ignacio Gestoso ◽  
Patrício Ramalhosa ◽  
João Canning-Clode
Keyword(s):  
Benthic Communities ◽  
Indigenous Species ◽  
Biotic Effects ◽  
Non Indigenous Species

scholarly journals New phytoplankton species in the Bay of Fundy since 1995

2008 ◽  
Vol 65 (5) ◽  
pp. 759-764 ◽  
Author(s):  
Jennifer L. Martin ◽  
Murielle M. LeGresley
Keyword(s):  
New Species ◽  
Bay Of Fundy ◽  
Indigenous Species ◽  
Phytoplankton Species ◽  
Lime Kiln ◽  
Phytoplankton Distribution ◽  
Passamaquoddy Bay ◽  
Odontella Sinensis ◽  
Non Indigenous Species ◽  
First Time

Abstract Martin, J. L., and LeGresley, M. M. 2008. New phytoplankton species in the Bay of Fundy since 1995. – ICES Journal of Marine Science, 65: 759–764. A monitoring programme was initiated in 1987 to study phytoplankton populations in the Western Isles region of the Bay of Fundy, southwest New Brunswick. Samples are collected weekly from May through October, and monthly during the remaining months, to determine phytoplankton distribution and abundance at Brandy Cove, Lime Kiln Bay, Deadmans Harbour, the Wolves Islands, and mid-Passamaquoddy Bay. Since the programme was initiated, several previously absent or non-indigenous species have been found, suggesting that new species may have been introduced to the area. In order to establish a baseline for species indigenous to Bay of Fundy waters, we have taken a conservative approach and termed species reported for the first time in the Bay of Fundy system since 1995 as “new” species. New species include the following: (dinoflagellates) Alexandrium pseudogonyaulax, Amphidinium carterae, A. sphenoides, Ceratium macroceros, Polykrikos schwartzii, Preperidinium meunieri, Protoperidinium crassipes, and Pyrocystis lunata; (diatoms) Attheya septentrionalis, Attheya longicornis, Chaetoceros radicans, Cylindrotheca gracilis, Grammatophora serpentina, Lithodesmium undulatum, Mediopyxis helysia, Membraneis challengeri, Neodenticula seminae, Odontella sinensis, Proboscia eumorpha, Pseudo-nitzschia subpacifica, Pseudo-nitzschia fraudulenta, and Thalassiosira punctigera.

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