The distribution of Chironomid larvae in relation to Chloride concentration in a brackish water region of the Netherlands

Hydrobiologia ◽  
1977 ◽  
Vol 52 (1) ◽  
pp. 117-126 ◽  
Author(s):  
S. Parma ◽  
B. P. M. Krebs
Keyword(s):  
The Netherlands ◽  
Brackish Water ◽  
Chloride Concentration ◽  
Chironomid Larvae ◽  
Water Region

Macrophytic vegetation of fresh and brackish waters in and near the Loch Druidibeg National Nature Reserve, South Uist

1979 ◽  
Vol 77 ◽  
pp. 307-328 ◽  
Author(s):  
D. H. N. Spence ◽  
E. D. Allen ◽  
J. Fraser
Keyword(s):  
Brackish Water ◽  
Nature Reserve ◽  
Chloride Concentration ◽  
Species Distributions ◽  
Rocky Shores ◽  
Brackish Waters ◽  
Potamogeton Perfoliatus ◽  
Oligotrophic Water ◽  
Causal Distribution ◽  
Isoetes Lacustris

SynopsisCentred on Loch Druidibeg, macrophyte vegetation was surveyed in and around 30 lochs in northern South Uist. Alkalinity ranges from 0·014 to 2·33 m.-equiv −1, conductivity (25°C) from 100 to 33,900 μs cm−1, chlorinity from 0·66 m.-equiv −1 upwards. Lochs are classed broadly as non-calcareous (gneissic), calcareous (machair) and brackish. This is an example of a Hebridean range not found elsewhere in the British Isles. Fen vegetation is highly modified by grazing, whilst tall reedswamp and floating-leaved plants are scarce on the mainly exposed and rocky shores, factors which contribute to the predominance of Fucoids in brackish water, of the open Littorella-Lobelia association in non-calcareous water. The Potamogeton filiformis-Chara association is confined to sand in calcareous machair lochs. Deep freshwater vegetation is typified by Isoetes, Potamogeton perfoliatus and P. praelongus.The very wide ranges in alkalinity and conductivity are reflected in some unusual species' distributions. For example, in freshwater lochs (conductivity up to 660 μs cm−1) several species like Isoetes lacustris, confined elsewhere to oligotrophic water, also occur in South Uist at moderately high alkalinities (to 1·8 m. -equiv 1−1). Conductivity varies with chloride concentration in all but the calcareous (machair) lochs; brackish lochs range from 2500 μs cm −1), which floristically, apart from Fucus ceranoides, is fresh water, to Fucoid-dominated rocks, and Ruppia on silt, in conductivities up to 33,900 μs cm−1. Of other angiosperms, Potamogeton gramineus appears to tolerate conductivities of 22,000 μs cm −1. Causal distribution in general is discussed.

A Survey of the Island Fisheries of the Territory of New Guinea and Papua

1951 ◽  
Vol 2 (2) ◽  
pp. 226 ◽  
Author(s):  
WH Schuster
Keyword(s):  
Brackish Water ◽  
Sea Water ◽  
New Guinea ◽  
Fish Stocks ◽  
Protein Requirements ◽  
River Deltas ◽  
Water Region ◽  
Large Populations ◽  
Productivity Potential ◽  
Lowland Lakes

A survey of two weeks' duration was made of part of the territory of New Guinea and Papua to study the possibility of extending the freshwater and brackish water fisheries. The brackish water region possesses a higher productivity potential than inland waters, owing to the introduction of the normal nutrient components of sea water with the fertile sedimented mud from the rivers, together with organic matter from the rain forests. Ecologically, and in regard to type of vegetation found, the limited coastal flats, the river deltas, and the extensive mangrove swamps are Indonesian in character. The estuarine region has a fauna rich in density, there being numerous fish species and large populations of prawns, while shrimps and oysters are also plentiful. In the freshwater areas two types of river exist — one shallow, subject to flooding and shifting of sands, and few fish; the second deep, with fertile mud, and fairly productive of fish. The lowland lakes, with fertile colloidal mud, were not examined in detail, but should provide a considerable fishery potential. There is considerable scope for fish cultural operations, e.g. in constructed ponds. Before a sound extension of the fisheries can be planned it will be necessary to obtain adequate basic scientific knowledge of the density and composition of the flora and fauna, including the food of the fish stocks, and of the characteristics of the environment. I t appears that a fishery more than adequate to supply the protein requirements of the coastal population could therefore be developed, by relatitive simple means, in the brackish waters and in the great lowland rivers.

EFFECTS OF ORGANIC CONTENT ON WATER CONTENT OF BOTTOM SEDIMENT IN EUTOROPHIC COASTAL AND BRACKISH WATER REGION

2018 ◽  
Vol 74 (7) ◽  
pp. III_43-III_51
Author(s):  
Keita HATTORI ◽  
Yoshiyuki NAKAMURA ◽  
Tetsunori INOUE ◽  
Hiroto HIGA ◽  
Ryoji NAITO ◽  
...  
Keyword(s):  
Bottom Sediment ◽  
Water Content ◽  
Brackish Water ◽  
Organic Content ◽  
Water Region

scholarly journals The Chloride Regulation of the Brackish and Fresh-Water Races of Mesidotea Entomon (L.)

1957 ◽  
Vol 34 (2) ◽  
pp. 253-258 ◽  
Author(s):  
A. P. M. LOCKWOOD ◽  
P. C. CROGHAN
Keyword(s):  
Fresh Water ◽  
Brackish Water ◽  
Sea Water ◽  
Chloride Concentration ◽  
Ice Age ◽  
General Level ◽  
Last Ice Age ◽  
The Baltic ◽  
Chloride Regulation

1. Mesidotea entomon (L.) is found in the Baltic and in certain fresh-water lakes in Sweden. It is believed that colonization of fresh water in this region has taken place since the last Ice-age. 2. In the present work animals from brackish and fresh-water habitats have been compared both in respect of the concentration of chloride in their haemolymph and of their ability to survive in media of various salinities. 3. Both fresh-water and Baltic animals have been found able to survive in Plymouth sea water, the concentration of chloride in their haemolymph being close to the concentration of chloride in this medium. 4. Baltic animals could not be acclimatized to fresh water. 5. Animals from both habitats have the same general level of chloride concentration in their haemolymph when acclimatized to dilute sea water. 6. These results are discussed in relation to the evolution of a fresh-water race from a brackish-water race.

scholarly journals Alien amphipods (Arthopoda; Crustacea) in the Tista Estuary, Halden, southeastern Norway

2021 ◽  
Vol 41 ◽  
pp. 34-40
Author(s):  
Ingvar Spikkeland ◽  
Jens Petter Nilssen
Keyword(s):  
The Netherlands ◽  
Baltic Sea ◽  
Brackish Water ◽  
Western Europe ◽  
The Black Sea ◽  
Ecological Niches ◽  
Ship Traffic ◽  
The Baltic ◽  
Kiel Canal ◽  
Corophium Multisetosum

Two new amphipods for Norway Melita nitida and Corophium multisetosum (Crustacea; Amphipoda) were registered in brackish waters in the Tista Estuary in Halden, southeastern Norway. Both species were found in the samples from Tista’s outlet into the Idde Fjord, C. multisetosum in the beach zone and M. nitida at about 4 m depth. Melita nitida is a North American species first found in Europe in the Netherlands in 1998, and since then dispersed into the Baltic Sea via the Kiel Canal and now also found several places on the German Baltic Sea coast and in the Black Sea. Corophium multisetosum was collected even before the 1920s in Western Europe, and is considered native for Europe, whereas its relationship to North America is more ambiguous. From the British Isles and the Netherlands, it seems to have spread to Germany, Poland, Denmark and Sweden, and at present Norway. Until now the two species were found in small numbers at the Norwegian sites and their influence on the total benthic community is probably negligible in this initial phase. The Tista Estuary in Halden apparently appears to be a hotspot for alien brackish water species in Norway. Generally estuaries, with their combination of brackish water jointly with their unsaturated ecological niches and intensive international ship traffic, seem to possess the highest potential infection rate for aquatic systems with alien acrozoobenthic species.

scholarly journals Lanthanum in Water, Sediment, Macrophytes and chironomid larvae following application of Lanthanum modified bentonite to lake Rauwbraken (The Netherlands)

2020 ◽  
Vol 706 ◽  
pp. 135188 ◽  
Author(s):  
Frank van Oosterhout ◽  
Guido Waajen ◽  
Said Yasseri ◽  
Marcelo Manzi Marinho ◽  
Natália Pessoa Noyma ◽  
...  
Keyword(s):  
The Netherlands ◽  
Chironomid Larvae ◽  
Modified Bentonite

scholarly journals Deposition and Transportation Characterisrics of Organic Matter in Brackish Water Region

2010 ◽  
Vol 66 (1) ◽  
pp. 1091-1095
Author(s):  
Masami ABE ◽  
Katsuaki KOMAI ◽  
Masataka IMAGAWA ◽  
Tadashi HIBINO
Keyword(s):  
Organic Matter ◽  
Brackish Water ◽  
Water Region
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