scholarly journals LISTA PRELIMINAR DE LOS MOLUSCOS DE LA CIÉNAGA GRANDE DE SANTA MARTA (COLOMBIA)

2016 ◽  
Vol 7 ◽  
Author(s):  
Rudo Von Cosel
Keyword(s):  
Environmental Factors ◽  
Brackish Water ◽  
Freshwater Species ◽  
Actual Distribution ◽  
Mollusc Species

38 mollusc species of 24 families and 30 genera, living in the Ciénaga Grande de Santa Marta or its mouth are listed. Among these 32 are marine, tolerating brackish water (marine euryhaline), 4 extremely euryhaline and 2 freshwater species (limnetic). Empty shells of some species have a much greater distribution in the Ciénaga than the actual distribution of the live species. The environmental factors of the Ciénaga are described briefly.

scholarly journals Biological Conservation of Molluscs Based on Spatial and Temporal Distribution in Tropical Tidal Lake, Medan-Indonesia

2020 ◽  
Vol 27 (4) ◽  
pp. 273
Author(s):  
Fredinan Yulianda ◽  
Ahmad Muhtadi ◽  
Mennofatria Boer ◽  
Majariana Krisanti ◽  
Yusli Wardiatno
Keyword(s):  
Brackish Water ◽  
High Tide ◽  
Temporal Distribution ◽  
Conservation Strategy ◽  
Lake Ecosystem ◽  
Freshwater Species ◽  
Spatial And Temporal Distribution ◽  
Mollusc Species ◽  
Brackish Water Species ◽  
Malacca Strait

The tidal lake ecosystem is formed by the flow of the Belmera River and seawater through a tidal process along a course of 12 km from Belawan (Malacca Strait). This lake has a tidal lake that has the characteristics of fresh water to brackish water and Mollusc communities from freshwater species to brackish water species. This study was performed to develop a mollusc conservation strategy based on the spatial and temporal distribution of Mollusca in the tides. The study was conducted from September 2018-August 2019. Mollusc samples were taken every month at high tide and low tide using a Petersen grab tool. Nine Mollusca species, consisting of three bivalves and six gastropods, were identified. Polymedosa expansa is a mollusc species that is considered for conservation. The population size of P. expansa is small, and its distribution is limited to the northern lake. P. expansa was found only in September at high tide and in December at low tide. Competition among Mollusca and habitat availability are obstacles to the survival of P. expansa. The habitat of P. expansa is mangrove, and therefore a conservation approach was carried out through improvement of mangrove quality.

Toxico-resistance of Baltic amphipod species to heavy metals

Crustaceana ◽  
2013 ◽  
Vol 86 (7-8) ◽  
pp. 1007-1024 ◽  
Author(s):  
Evita Strode ◽  
Maija Balode
Keyword(s):  
Heavy Metals ◽  
Brackish Water ◽  
High Sensitivity ◽  
Culture Collection ◽  
Amphipod Species ◽  
Freshwater Species ◽  
Gammarus Tigrinus ◽  
Toxicological Studies ◽  
Wide Range ◽  
Test Objects

Benthic organisms are important components of aquatic ecosystems and have been widely used to assess environmental pollution. Being very sensitive to a wide range of toxicants amphipods are often used as test objects in eco-toxicological studies. The aim of this study was to compare toxico-resistance of various Baltic amphipod species to exposure of heavy metals. The acute toxicity (48-h LC50 and 96-h LC50) of cadmium (CdCl2), copper (CuSO4) and zinc (ZnSO4 ⋅ 7H2O) was detected experimentally, using juveniles and adults of brackish water amphipods, Monoporeia affinis, Bathyporeia pilosa, Gammarus tigrinus, Pontogammarus robustoides and the freshwater amphipod Gammarus pulex as test objects. Amphipods were collected in Latvian territorial waters of the Open Baltic Sea, the Gulf of Riga and in a freshwater body (Kalkugrava canal). Sensitivity of native amphipod species was compared to Hyalella azteca (a species widespread in North America; a strain obtained from the Chesapeake Culture Collection, Hayes, VA, U.S.A.). High sensitivity of all tested amphipod species, except M. affinis, to heavy metals was observed. A two-way ANOVA analysis showed significant differences in toxico-resistance of selected test objects (). The highest toxico-resistance was shown by the brackish water amphipod M. affinis (96-h LC50: Cd 5.16 mg/l; Cu 5.68 mg/l; Zn 11.31 mg/l), but the lowest by the freshwater species G. pulex and H. azteca (96-h LC50 for Cd 0.005 and 0.007 mg/l, accordingly). Cadmium was the most toxic from the tested heavy metals, followed by copper and zinc.

scholarly journals Entomostraca

1879 ◽  
Vol 168 ◽  
pp. 215-218 ◽  
Keyword(s):  
Brackish Water ◽  
High Water ◽  
Freshwater Lake ◽  
The Other ◽  
Calanus Finmarchicus ◽  
Freshwater Species ◽  
Kerguelen Island ◽  
High Water Mark ◽  
Oceanic Species

[Ostracoda. All of the Ostracoda collected by me in Kerguelen Island were lost by a breakage.—A. E. E.] Copepoda. The Entomostraca submitted to me were taken in the following localities:—One surface-net gathering, in lat. 35° 9' S., long. 45° 30' E.; another gathering from a freshwater lake, and a third from a pool above high-water mark, both in Kerguelen Island. The oceanic species were Calanus Finmarchicus and a Sapphirina , either identical with or very closely allied to S. danœ , Lubbock; those from Kerguelen Island were a freshwater species, apparently new, described by me briefly in Ann. and Mag. Nat. Hist., Sept. 1875, under the name Centropages brevicaudatus ; and a species from brackish water, Harpacticus fulvus . No species have yet been recorded by the other Expeditions.

Mismatch between molecular (mtDNA) and morphological classification of Macrobrachium prawns from Southern Nigeria: Cryptic freshwater species and brackish water morphotypes

Aquaculture ◽  
2013 ◽  
Vol 410-411 ◽  
pp. 25-31 ◽  
Author(s):  
Abayomi A. Jimoh ◽  
Martins A. Anetekhai ◽  
Steve Cummings ◽  
Olatunji T.F. Abanikanda ◽  
George F. Turner ◽  
...  
Keyword(s):  
Brackish Water ◽  
Freshwater Species ◽  
Morphological Classification ◽  
Southern Nigeria

THE INFLUENCE OF ENVIRONMENTAL FACTORS TO MOLLUSCS DISTRIBUTION PATTERNS IN NATURAL AND REHABILITATED MANGROVE ECOSYSTEM

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Andi Nur Samsi ◽  
Sharifuddin Bin Andy Omar ◽  
Andi Niartiningsih
Keyword(s):  
Environmental Factors ◽  
Distribution Pattern ◽  
Quantitative Method ◽  
Distribution Patterns ◽  
Mangrove Ecosystem ◽  
Dispersal Patterns ◽  
Carbon And Nitrogen ◽  
Mangrove Ecosystems ◽  
Mollusc Species ◽  
Carbon And Nitrogen Content

Mangrove ecosystem is a habitat of Molluscs (Gastropoda and Bivalvia). This ecosystem is always influenced by environmental factors. This study aims to determine the influence of environmental factors on the distribution patterns Molluscs of natural mangrove ecosystems in Pannikiang Island, Barru Regency and rehabilitation mangrove ecosystem in Tongke-tongke village, Sinjai regency. This research uses the quantitative method. Environmental factors measured were temperature and salinity of the water, as well as carbon and nitrogen content of sediment. Samples of Molluscs (Gastropoda and Bivalves) and sediments were taken randomly. The observations of the Molluscan community include the composition of Mollusc species (Gastropoda and Bivalvia) and dispersal patterns. Data were analyzed by using multiple linear regression. The results showed that the distribution pattern of Molluscs (Gastropoda and Bivalvia) at both sites was not significantly different and the temperature, salinity, carbon, and nitrogen sediments also did not affect the Mollusk distribution pattern in both sites. Ekosistem mangrove merupakan habitat Moluska (Gastropoda dan Bivalvia). Ekosistem ini selalu dipengaruhi oleh faktor lingkungan. Penelitian ini bertujuan untuk mengetahui pengaruh faktor lingkungan terhadap pola distribusi  pada ekosistem mangrove alami di Pulau Pannikiang, Kabupaten Barru dan ekosistem mangrove hasil rehabilitasi di Desa Tongke-tongke, Kabupaten Sinjai. Penelitian ini menggunakan metode kuantitatif. Faktor lingkungan yang diukur adalah suhu dan  salinita air, serta kandungan karbon dan nitrogen sedimen. Sampel Moluska (Gastropoda dan Bivalvia) dan sedimen diambil secara acak. Pengamatan komunitas Moluska meliputi komposisi jenis Moluska (Gastropoda dan Bivalvia) dan pola penyebaran. Data dianalisis dengan menggunakan regresi linear berganda. Hasil penelitian menunjukkan pola distribusi Moluska (Gastropoda dan Bivalvia) pada kedua lokasi tidak berbeda nyata dan suhu, salinitas, karbon, dan nitrogen sedimen juga tidak mempengaruhi pola distribusi Moluska di kedua lokasi penelitian.

Decomposition products of cylindrospermopsin – a cyanotoxin produced by Raphidiopsis raciborskii (Woloszynska)

2019 ◽  
Vol 48 (3) ◽  
pp. 227-235 ◽  
Author(s):  
Michal Adamski ◽  
Paweł Żmudzki ◽  
Jan Bialczyk ◽  
Ariel Kaminski ◽  
Ewelina Chrapusta-Srebrny ◽  
...  
Keyword(s):  
High Temperature ◽  
Environmental Factors ◽  
Vibrio Fischeri ◽  
Freshwater Species ◽  
Decomposition Products ◽  
Structural Modifications ◽  
Toxicity Potential ◽  
Alkaline Conditions ◽  
Living Organisms ◽  
Guanidine Moiety

Abstract Toxins produced by cyanobacteria (cyanotoxins) and released into water have become a serious problem worldwide due to the increasing morbidity and mortality of living organisms they have caused. The ability to synthesize the cytotoxic alkaloid cylindrospermopsin (CYN) has been demonstrated in several freshwater species of cyanobacteria. CYN is highly chemically stable under environmental factors and decomposes only under alkaline conditions, where it forms derivatives. The toxicity potential of the decomposition products formed at pH 10 combined with high temperature (100°C) or UV-B irradiation (36 μmol m−2 s−1) has been research based on the crustacean Thamnocephalus platyurus (Thamnotoxkit FTM) and bacteria Vibrio fischeri (Deltatox® II) bioassays. This paper is a continuation and completion of our previous experiments and the obtained results showed that the applied conditions contributed to the decomposition of the CYN molecule to non-toxic products and its structural modifications by separating the uracil ring or/and the sulfate group from the tricyclic guanidine moiety, leading to a reduction in its toxicity. To the best of our knowledge, this is the first report describing the toxicity of CYN decomposition products formed under alkaline conditions combined with boiling temperature or UV-B irradiation.

Sign in / Sign up

Export Citation Format

Share Document