Corbicula an annotated bibliography 1774 2005



Download 2.47 Mb.
Page18/42
Date18.10.2016
Size2.47 Mb.
#1677
1   ...   14   15   16   17   18   19   20   21   ...   42

-- J --
Jackson, J. W. and A. Bulleid. 1932. The occurrence of Corbicula fluminalis in the west of England. Report of the British Association for the Advancement of Science 99:379.

Recent excavations have exposed considerable sections of shelly sands and gravels in the vicinity of Middlezoy, Somerset. These beds, known as the Burtle Beds, contain a large series of common and widely distributed marine shells, together with the bones and teeth of mammals. A few examples of Corbicula fluminalis in these beds were found associated with marine fauna. This is the first record of C. fluminalis in the west of England. It has been reported from West Wittering, Sussex, along with similar marine shells, and from to 80 90 ft terrace of the Warwickshire Avon, at Ailstone, near Stratford. These are the two nearest sites to the Somerset locality. The species is known from the Red Crag and subsequent deposits up to the middle Pleistocene at Crayford, where it makes its last appearance. It has been found in some abundance in the terraces of the Thames and Cam, and in the Oxford gravels; also in the interglacial grvels at Kelsey Hill, Holderness, associated with many marine shells. In France it has been recorded from the estuarine bed, 24 ft above mean sea level, at Menchecourt, where it occurred with seven species of marine shells identical with those at Somerset. There is no evidence to suggest that the Somerset Beds with C. fluminalis are later than Crayford, which is regarded as early Mousterian from its contained implements.

Jacomini, A. E., W. E. P. Avelar. 2002. Paiva Bioacumulação do herbicida atrazina pelas espécies de bivalves limnicos Anodontites trapesialis (Lamarck, 1819) e Corbicula fluminea (Muller, 1774). Masters’s Thesis, Ribeirão Preto. 89 pp. [Portuguese]

Inúmeros pesticidas são usados na agricultura, para controle de pragas e ervas daninhas. Dentre eles destaca-se o herbicida atrazina, intensivamente utilizado nas culturas de cana-de-açúcar, milho e sorgo, que ocupam extensas áreas no estado de São Paulo. Grande parcela do herbicida, que é aplicado na agricultura, entra em contato com o solo, podendo ser lixiviado, atingindo as águas superficiais. Neste sentido, alguns animais como, por exemplo, moluscos bivalves, podem ser utilizados como monitores biológicos do ambiente aquático e auxiliar no estudo da ecotoxicologia. Considerando o risco de contaminação do ambiente aquático pela atrazina, propõe-se no presente trabalho, desenvolver uma metodologia de análise daquele herbicida nos tecidos nas espécies de bivalves límnicos Anodontites trapesíalis (LAMARCK, 1819) e Corbicula fluminea (Muller, 1789), validar esse método e, finalmente, verificar se ocorre a bioacumulação do herbicida nas panes moles dessas duas espécies. Como técnica de extração utilizou-se a extração líquido-líquido e como técnica de análise, a cromatografia líquida de alta eficiência.

Jadhav, S., Y. B. Sontakke and V. S. Lomte. 1996. Carbaryl toxicity to freshwater bivalve Corbicula striatella. Environment and Ecology 14(4):863-865.

The wide scale use of chemical pesticides in agricultural and public health, contaminate the aquatic ecosystem. It causes harmful effects to non target organisms. Exposure to such pesticides create imbalance in physiological functioning of the organisms. To study this, acute toxicity tests were carried out by using carbaryl (carbamate) to the freshwater bivalve Corbicula striatella. The regression equations were established by using probit mortality and log of concentrations of pesticide. The LC10 and LC50 values were found to range from 35.9 to 3.3 ppm and from 67.01 to 5.1 ppm respectively for 24 to 96 periods of time.

Jadhav, S., Y. B. Sontake and V. S. Lomte. 1996. Effect of carbaryl on ascorbic acid content in the selected tissues of Carbicula striatella. Journal of Ecotoxicology and Environmental Monitoring 6(2):109-112.

The present study shows variation in ascorbic acid content of bivalve Corbicula striatella were exposed to median lethal (2.58 ppm) and sublethal (0.51 ppm) concentrations of carbaryl for 1 to 21 days and ascorbic contents were estimated. The mantle, foot, gill, digestive gland and whole body of C. striatella showed depletion over control during acute and chronic exposure to carbaryl.

Janech, M. G. and R. D. Hunter. 1995. Corbicula fluminea in a Michigan river: Implications for low temperature tolerance. Malacological Review 28(1-2):119-124.

Jang, I.-K. and C.-H. Kim. 1992. A study on the changes of the molluscan and crustacean fauna after the construction of the Naktong Estuary Barrage. Journal of the Korean Fisheries Society 25(4):265-281. [Korean with English summary]

The materials of this study consist of both specimens and survey records of the mollusks and crustaceans which were obtained from 30 collection sites in the Naktong Estuary South during August similar to November, 1991. The mollusks and crustaceans collected identified in this study are 31 and 50 species, respectively; 2 species of mollusks and 6 species of crustaceans were newly recorded in this area. The occurrence and distribution of 63 molluscan species and 138 crustacean species were compared in 8 zones, before and after the construction of the Naktong Estuary Barrage. During this investigation, only a few species of mollusks occurred in the northern freshwaters off the Barrage. The habitats for the intertidal species were greatly destructed along the eastern part of the Ulsuk Island and the riverside of Tadaep'o where the bank was recently constructed. The commercial bivalves including Corbicula fluminea and Ruditapes philippinarum greatly decreased in number in all the estuarine waters. A freshwater crab (Eriocheir japonicus) has disappeared in the Naktong River and its neighbouring streams.

Jenkinson, J. J. 1979. The occurrence and spread of Corbicula manilensis in east central Alabama. The Nautilus 94(4):149 153.



Corbicula manilensis is reported from the Tallapoosa River, Tallapoosa County, Alabama, Saugahatchee Creek, Lee County, Alabama, Chattahoochee River, Troup County, Georgia, Uchee Creek, Russell and Lee counties, Alabama, and Little Uchee Creek, Russell County, Alabama. Ecological notes on substratum preference and water quality are presented.

Jenkinson, J. J. and S. A. Ahlstedt. 1987. Mussel die offs downstream from Pickwick Landing Dam, Tennessee River, 1985 and 1986. IN: Proceedings of the Workshop on Die Offs of Freshwater Mussels in the United States, R. J. Neves, Ed. U.S. Fish and Wildlife Service, Upper Mississippi River Conservation Committee, and Virginia Polytechnic Institute and State University (Blacksburg). pp. 29 38.



Corbicula sp. found in association with mussels in a die off were reported to be infected by Bacillus sp. (very heavy) and Pseudomonas fluorescens putida (moderate).

Jenner, H. A. and J. P. M. Janssen-Mommen. 1993. Monitoring and control of Dreissena polymorpha and other macrofouling bivalves in The Netherlands. IN: Zebra Mussels: Biology, Impacts, and Control. Lewis Publishers (Boca Raton, Florida). pp. 537-554.

Three fouling bivalves (the zebra mussel, Dreissena polymorpha; the Asian clam, Corbicula fluminea; and the brackish water mussel, Mytilopsis leucophaeta) are present in The Netherlands. Of these three species, the zebra mussel is the most troublesome and control is often necessary. Settlement, growth, and effectiveness of control of the zebra mussel within water systems can be detected and followed with a settlement monitor. In addition, the behavior of zebra mussel valve movements is a useful monitoring method that shows toxic effects during chemical control. At present, there are six primary methods used to control macrofouling bivalves in The Netherlands: chlorination, surface coatings, heat treatment, drying, water velocity, and microseives. In most instances, control of bivalves at a particular water pumping facility relies primarily on one of these six methodologies. However, the primary method of control may be and often is supplemented with additional control methods that are more efficient based on the facility, time of year, and mussel life stage than the primary control method. This use of integrated control technology has substantially reduced macrofouling problems caused by bivalves in The Netherlands.

Jickeli, C. F. 1873. Reisebericht. Malakozoologische Blätter 20:1 20.



Corbicula consobrina is discussed.

Jickeli, C. F. 1874. Fauna der Land  und Süsswasser Mollusken Nord Ost Afrik'as. Nova Acta der Kaiserlich Deutschen Akademie der Naturforschenden Dresden 37(1):1 352.



Corbicula zelebori sp. nov. is described (p. 290) and figured (pl. 11, fig. 13) from a freshwater channel near Suez, Egypt. Corbicula consobrina (Cailliaud), Corbicula cor (Lamarck), Corbicula saulcii (Bourguignat), and Corbicula crassula (`Mousson' Bellardi) are synonymized with Corbicula fluminalis (Müller). Corbicula radiata is reported from Sennar and Corbicula pusilla is reported from Aswan, Sennar and the White Nile.

Jobsis, G. J. 2000. Assessment of water quality, crayfish and Corbicula of the Reedy River, South Carolina following a diesel oil spill. Southern Division of the American Fisheries Society 2000 Midyear Meeting, Savannah, Georgia, 3-6 February.

Joh, Y. G., S. J. Park and C. W. Ahn. 1982. Lipids of fresh water cockle, Corbicula elatior. Bulletin of the Korean Fisheries Society 15(1):94 98.

The chemical characteristics, lipid composition, fatty acid components and the sterol composition of Corbicula elatior were studied. The oil content, I value and unsaponifiable matter of the total lipids were 2.17, 119, and 16.6%, respectively. The main components of the total lipids were phospholipids (about 43%), triglycerides and sterols. The main fatty acids of the total lipids were C 18:0 (48.4%), C 14:0 (10.0%), C 18:3 *8.3%), C 14:1 (5.4%) and C 18:1 (5.3%). Sterols found were 24 methylenecholesterol (14.1%), beta sitosterol (22.5%), fucosterol (14.9%), isofucosterol (7) (14.0%), (detla 7 avenasterol)(?) (5.2%) and cholesterol (2.3%).

Johansen, A. C. 1904. Om den Fossile Kvartaere Molluskfauna. (Kobenhavn).

Johnson, K. I., C. H. Henager, T. L. Page, and P. F. Hayes. 1986. Engineering factors influencing Corbicula fouling in nuclear service water systems. IN: Proceedings of the Second International Corbicula Symposium, J. C. Britton, Ed. American Malacological Bulletin Special Edition No. 2. pp. 47 52.



Corbicula fouling is a persistent problem in the service water systems of nuclear power plants. An understanding of the biological characteristics of Corbicula and the engineering characteristics of service water systems is important in developing effective detection and control methods. A data base of Corbicula fouling was compiled from nuclear and non nuclear power stations and other industrial users of large volumes of raw water. The data base was analyzed to identify engineering factors common to service water systems that are conducive to fouling by Corbicula. Bounds on several engineering parameters such as flow velocity and water temperature which support Corbicula growth are given.

Johns, C., S. N. Luoma and V. Elrod. 1988. Selenium accumulation in benthic bivalves and fine sediments of San Francisco Bay, the Sacramento-San Joaquin Delta, and selected tributaries. Estuarine, Coastal and Shelf Science 27(4):381-396.

Spatial distributions of selenium were determined in fine-grained, oxidized, surface sediments and in two benthic bivalves (Corbicula sp., a suspension-feeding freshwater clam, and Macoma balthica, a deposit-feeding brackish-water clam) within San Francisco Bay, the San Joaquin River and three river systems unlikely to be subject to selenium inputs.

Johns, C. and S, N. Luoma. 1990. Arsenic in benthic bivalves of San Francisco Bay and the Sacramento/San Joaquin River Delta. Science of the Total Environment 97-98:673-684.

Arsenic concentrations were determined in fine-grained, oxidized, surface sediments and in two benthic bivalves, Corbicula and Macoma balthica, within San Francisco Bay, the Sacramento/San Joaquin River Delta, and selected rivers in California, not influenced by urban or industrial activity. Arsenic concentrations in all samples were characteristic of values reported for uncontaminated estuaries. Small temporal fluctuations and low arsenic concentrations in bivalves and sediments suggest that most inputs of arsenic are likely to be minor and arsenic contamination is not widespread in the Bay.

Johnson, P. D. and R. F. McMahon. 1998. Effects of temperature and chronic hypoxia on survivorship of the zebra mussel (Dreissena polymorpha) and Asian clam (Corbicula fluminea). Canadian Journal of Fisheries and Aquatic Sciences 55(7):1564-1572.

The effects of four levels of chronic hypoxic stress at three temperatures on the survivorship of Dreissena polymorpha and Corbicula fluminea to were examined to assess the efficacy of O2 deprivation as a macrofouling control treatment and examine if critical hypoxia limits support reported distribution patterns. At 25oC, the hypoxia tolerance was examined at Po2 = 7.9, 11.9, 15.9, 23.8, and 31.8 Torr (1 Torr = 133.322 Pa) or 5, 7.5, 10, 15, and 20% of full air O2 saturation (Po2 = 159 Torr). At 15oC, the hypoxia tolerance to 7.9, 11.9, and 15.9 Torr was tested and at 7.9 Torr for 5oC treatments. For both species, Po2 and temperature influenced survivorship dramatically with increasing survivorship at higher Po2 and decreasing temperatures. At 25oC, C. fluminea experienced mortality at 7.9, 11.9, and 15.9 Torr, with LT50 values of 144, 216, and 216 h, respectively, versus 288, 384, and 480 h for the 15oC exposures. Dreissena polymorpha treatments had LT50 values of 120, 216, and 216 h at 25oC for the 7.9-, 11.9-, and 15.9-Torr treatments versus 26% mortality after 600 h and 28% mortality after 720 h at 15oC. The 7.9-Torr treatments at 5oC had LT50 values of 480 h for C. fluminea and 1056 h for D. polymorpha. This study showed that both species displayed broad seasonal variation in hypoxia tolerance and that hypoxia limits may be used to assess infestation risk.

Johnson, R. I. 1959. The types of Corbiculidae and Sphaeriidae (Mollusca: Pelecypoda) in the Museum of Comparative Zoology, and a biobibliographic sketch of Temple Prime, an early specialist of this group. Bulletin of the Museum of Comparative Zoology 120:429 479.



Bibliographic citations, institutional locations and catalogue numbers are provided for the following species of Corbicula: Corbicula adunca Heude, 1880; Cyrena africana Krauss, 1884; Corbicula agrensis Prime, 1860; Corbicula amazonica `Anthony' Prime, 1870; Corbicula ammiralis Prime, 1870; Corbicula angasi Prime, 1864; Corbicula aquilina Heude, 1880; Corbicula astronomica Heude, 1880; Corbicula aurea Heude, 1880; Corbicula baronialis Prime, 1870; Corbicula bengalica Deshayes, 1854; Corbicula bensonii Deshayes, 1854; Corbicula bezauriana Heude, 1880; Corbicula bilineata Heude, 1880; Corbicula blandiana Prime, 1864; Corbicula borealis Prime Heude, 1880; Corbicula brunea Prime, 1860; Corbicula cantatoria Heude, 1880; Corbicula castanea (Morelet, 1865); Corbicula chemnitziana Prime, 1864; Corbicula cheniana Heude, 1880; Corbicula clenchii nom. nov. for Corbicula squalida Heude, 1888, non Deshayes, 1855); Corbicula colombeliana Heude, 1880; Corbicula colonialis Prime, 1867; Corbicula conica Heude, 1880; Corbicula conica var. b Heude, 1880; Corbicula consanguinea Prime, 1867; Corbicula consularis Prime, 1870; Corbicula convexa Deshayes, 1854; Corbicula cordieriana Heude, 1880; Corbicula crosseana Prime, 1864; Corbicula cumingii Deshayes, 1854; Corbicula cyreniformis Prime, 1860; Corbicula debrixiana Heude, 1880; Corbicula delavayana Heude, 1880; Corbicula delessertiana Prime, 1870; Corbicula difficilis Prime, 1863; Corbicula diminuta Heude, 1880; Corbicula ducalis Prime, 1862; Corbicula episcopalis Prime, 1870; Corbicula erosa Prime, 1861; Corbicula fenouilliana Heude, 1880; Corbicula ferruginea Heude, 1880; Corbicula fluitans Heude, 1880; Corbicula fluminea (Müller, 1774) Corbicula foukiensis Heude, 1880; Corbicula gentiliana Heude, 1880; Corbicula globus `Jonas' Prime, 1860; Corbicula gracilis Prime, 1860; Corbicula gravis Heude, 1880; Corbicula gryphaea Heude, 1880; Corbicula gubernatoria Prime, 1870; Corbicula hammalis `Férussac' Prime, l869; Corbicula ignobilis Heude, 1880; Corbicula imperialis Prime, 1870; Corbicula inaequilateralis Prime, 1861; Corbicula indigotina Heude, 1880; Corbicula ingloriosa Heude, 1880; Corbicula insularis Prime, 1867; Corbicula iodina Heude, 1880; Corbicula iridinea Heude, 1880; Corbicula japonica Prime, 1864; Corbicula kirkii Prime, 1864; Corbicula lamarckiana Prime, 1864; Corbicula lapicida Heude, 1880; Corbicula largillierti Philippi, 1844; Corbicula leana Prime, 1864; Corbicula leleciana Heude, 1880; Corbicula leviuscula Prime, 1864; Corbicula linneana Prime, 1864; Corbicula loehensis Kruimel, 1918; Corbicula lutea (Morelet, 1862); Corbicula lydigiana Prime, 1861; Corbicula mahlonensis Kruimel, 1918; Corbicula malaccensis Deshayes, 1854; Corbicula manchuricum `A. Adams' Prime, 1895; Corbicula masapensis Kruimel, 1918; Corbicula maxima Prime, 1860; Corbicula mediocris Prime, 1862; Corbicula minor Prime, 1860; Corbicula moltkiana Prime, 1878; Corbicula montana Heude, 1880; Corbicula moreletiana Prime, 1864; Corbicula mulleriana Prime, 1864; Corbicula notata Prime, 1860; Corbicula obsoleta Deshayes, 1854; Corbicula obtruncata Heude, 1880; Corbicula occidens `Benson' Deshayes, 1854; Corbicula ovalis Prime, 1860; Corbicula papyracea Heude, 1880; Corbicula parva Prime, 1860; Corbicula perplexa Prime, 1865; Corbicula pexata Prime, 1864; Corbicula pfeifferiana Prime, 1867; Corbicula pisidiiformis Prime, 1866; Corbicula polychromatica Heude, 1880; Corbicula porcellanea Heude, 1880; Corbicula portentosa var. a, Heude, 1880; Corbicula praeterita Heude, 1880; Corbicula presseplicata Heude, 1880; Corbicula prolongata Prime, 1861; Corbicula purpurea Prime, 1863; Corbicula quilonensis `Benson' Prime, 1866; Corbicula quilonica Benson, 1860; Corbicula radiata `Parreyss' Philippi, 1846; Corbicula rathousiana Heude, 1880; Corbicula regularis Prime, 1860; Corbicula rhomboidea Prime, 1860; Corbicula rotunda Prime, 1860; Corbicula sayana Prime, 1864; Corbicula scholastica Heude 1880; Corbicula semisulcata Deshayes, 1854; Corbicula similis Deshayes, 1854; Corbicula solidula Prime, 1860; Corbicula soriniana Heude, 1880; Corbicula sphaerica Heude, 1880; Corbicula squalida Deshayes, 1854; Corbicula squalida Heude, 1880; Corbicula stimpsoniana Prime, 1886; Corbicula striatella Deshayes, 1854; Corbicula subquadrata Heude, 1880; Corbicula subradiata `Kerr' Prime, 1861; Corbicula sulcatina Deshayes, 1854; Corbicula tenuistrata Prime, 1860; Corbicula towutensis Kruimel, 1918; Corbicula triangularis Deshayes, 1854; Corbicula trigona Deshayes, 1854; Corbicula tumida Deshayes, 1854; Corbicula uncinulata Heude, 1880; Corbicula variegata Heude, 1880; Corbicula ventricosa Prime, 1860; Corbicula venustula Prime, 1864; Corbicula vicina Heude, 1880; Corbicula violacea Prime, 1860; and Corbicula vulgaris Prime, 1866.

Johnson, T. H. and E. R. Simpson. 1944. Larval trematodes from Australian freshwater molluscs. IX. Transactions of the Royal Society of South Australia 68(1):125 132.



Cercaria ellisi sp. nov., a 45 spined echinostomid, is described from Limnaea lessoni. The cyst stage occurs in Amerianna spp., Planorbis isingi Limnaea lessoni, Corbicula angasi, Plotiopsis tatei and in the tadpole of Crinia signifera. The adult probably occurs in a ralline bird. Cercaria gigantura var. grandior, from Amerianna pyramidata, differs from the type in the tail and slightly larger cysts.

Jonas, J. H. 1844. Vorläufige diagnosen neuer Conchylien. Zeitschrift für Malakologie 1:185 187.



Corbicula cuneata sp. nov. is described (p. 186), from the Orinoco River.

Jonas, J. H. 1846. IN: Abbildungen und Berchreibungen neuer oder wenig gekannten Conchylien. 2 (Cyrena). Vol. II, R. A. Philippi, Ed.



Corbicula cuneata Jonas, 1844, is discussed (p. 113) and figured (pl. 17, fig. 5), from the Orinoco River. Corbicula globosus 'Jonas' in litt. is discussed and synonymized with C. cuneata.

Jones, A. W. 1898. The Mentor beds. Transactions of the Kansas Academy of Science 15:111 112.



Corbicula? nucalis (Meek, 1870) and Corbicula? subtrionalis (Meek, 1870) are reported from the Mentor Comanchean of Kansas.

Joy, J. E. 1985. A 40 week study on growth of the Asian clam, Corbicula fluminea (Müller), in the Kanawha River, West Virginia. The Nautilus 99(4):110 116.

A sample population of Corbicula fluminea individuals maintained in cages was monitored over a 40 week period (12 March to 16 December 1983) to assess growth (in shell length, and overall body weight), percentage of total body weight made up to soft tissues (i.e. "condition index"), and mortality rates. There were virtually no increases in length or weight when water temperatures were below 10oC. Noticeable growth began when water temperature reached about 14oC. Highest rates of growth (shell length, 0.66 mm/wk; weight, 0.26 gm/wk) occurred when water temperatures were between 24o and 30oC. "Condition indices" (ranging from a low of 12.6% in June to a high of 21.2% in October) for experimentally caged clams were similar to those found in natural stream clams. Twenty five of the 300 (8.3%) clams under experimental conditions died.

Joy, J. E., A. J. Pritchard and D. Danford. 1983. Corbicula fluminea (Mollusca: Pelecypoda) as a Biological Indicator of Heavy Metals in the Kanawha River, WV. Proceedings of the West Virginia Academy of Science 55(2/3/4):113-117, 1983.

Two hundred large (16 to 24 mm) Corbicula fluminea individuals were monitored for 10 heavy metals at four different sites (50 clams at each site) on the Kanawha River over a nine week period. Analysis of the viscera revealed silver in the smallest concentrations (between 0.1 and 0.2 μg/g) of the metals at all four sites. Cadmium was also found in low concentrations (between 0.2 and 0.4 μg/g). Iron was found in the highest concentrations, in some cases surpassing 500 μg/g. Magnesium levels were also high, generally ranging between 100 and 200 μg /g at all sites. Concentrations of zinc were interesting because of their virtually unchanging levels (approximately 30 μg /g) at all four sites over the nine weeks. Copper concentrations were also very constant (between 7.0 and 9.0 μg /g) at all sites with the exception of weeks 7 and 9 at Marmet when copper levels reached 17.0 and 12.0 μg/g, respectively. While generally low, chromium levels were quite variable, ranging from 0.5 μg/g at London, to a high of 12.0 μg/g at Glen Ferris. Manganese levels were also quite variable, ranging from a low of 9.2 μg/g at Winfield to a high of 100 μg/g at London.

Joy, J. E. and L. E. McCoy. 1975. Comparisons of shell dimensions and viscera mass weights in Corbicula manilensis (Philippi, 1844). The Nautilus 89(2):51 54.

Relationships of shell weight, size and wet and dry viscera weights were computed for Corbicula manilensis. The highest coefficient of correlation was recorded for shell length vs. width (0.9993) and the lowest for shell width vs. viscera dry weight (0.8755). Regression analyses were calculated for each of 10 shells and viscera comparisons.

Junk, W. J. 1974. The bottom fauna and its distribution in Bung Borapet, a reservoir in central Thailand. Vereinigung für Theoretische und Angewandte Limnologie 19(3):1935 1946.

The biomass of the bottom fauna of Bun Borapet was largely made up of Bivalvia. These were represented by the genera Corbicula, Hyriopsis, Unio, Ensidens, Philobryconcha, Scaphula and Limnoperna. In the most intensively colonized areas, their biomass was as much as 222 g/m2 dry wt, and accounted for > 99% of the total biomass. The Ephemeroptera and Trichoptera, represented by Eatogenia sp and Dipseudopsis, were second in importance. The maximum biomass of these latter 2 genera were 0.95 and 0.7 g/m2 dry wt respectively. Chironomidae, Ostracoda and Oligochaeta were abundant; however, they were too small to contribute significantly to the biloass. The most important elements of the bottom fauna of Bung Borapet showed clear zonal distribution. The Bivalvia, except for Scaphula pinna and Limnoperna siamensis, occurred in greatest numbers in shallow water areas which were kept free of superficial sediment by a wave action. They did not occur in places where there was a thick layer of coarse detritus. Eatogenia was most numerous in areas suitable burrowing i.e. those parts of the lake bed covered with a layer of fine sediment. Dipseudopsis avoids both these areas, preferring to inhabit areas with coarse detritus i.e. along the edges of the stands of floating vegetation and in protected littoral areas amongst the submerged vegetation. Many other animal groups occurred amongst this vegetation. These, however, are not considered as bottom fauna, but are more comparable with the fauna of the floating vegetation. The Bivalvia Scaphula pinna and Limnoperna siamensis occupied an intermediate position since they occurred widely on the lake bed but were found in larger numbers in the floating vegetation. The biomass of the bottom fauna of Bung Borapet is higher than that of other tropical shallow lakes, mainly because of the large numbers of bivalves.



Download 2.47 Mb.

Share with your friends:
1   ...   14   15   16   17   18   19   20   21   ...   42




The database is protected by copyright ©ininet.org 2024
send message

    Main page