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  • Articles  (3)
  • 1985-1989  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Distribution and ecology of Middle Atlantic Bight Oligochaeta (1987)
    Springer
    Hydrobiologia 155 (1987), S. 215-225 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; continental shelf ; animal-sediment relations ; zoogeography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Distribution and ecology of continental shelf oligochaetes are poorly understood. From 1975 through 1977 baseline ecological studies were conducted in the Middle Atlantic Bight prior to oil exploration activities. A total of 38 species in three oligochaete families were collected. Of this total one family and 29 of the species were undescribed at the time of collection. The most abundant and widely distributed species were Limnodriloides monothecus, L. medioporus, Bathydrilus longus, Phallodrilus biprostatus, and Tubificoides diazi. No single species dominated the oligochaete fauna. All the oligochaete species responded to changes in physical parameters over the shelf similarly to the total macrofauna. Seasonal trends within the oligochaetes were not found. Species that preferred coarser sand sediments were all small interstitial forms. The finer sand and eurytopic species were all burrowers. Zoogeographically the Middle Atlantic Bight oligochaetes were predominantly temperate (16 species) with some southern species (8). Seven species were broadly distributed from the Caribbean to Massachusetts or around the world. Seven species were only known from the area studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025654
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Population dynamics of Tubificoides amplivasatus (Oligochaeta, Tubificidae) in the Oresund, Denmark (1989)
    Springer
    Hydrobiologia 180 (1989), S. 167-176 
    Details
    ISSN: 1573-5117
    Keywords: aquatic Oligochaeta ; long-term changes ; population dynamics ; life history
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A two year fortnightly collection of data from the 27 m station in the Oresund on the tubificid species Tubificoides amplivasatus was analyzed for population trends and life stages. Recruitment patterns from year to year were consistent in timing but very irratic in magnitude, being similar to patterns seen in other estuarine and marine annelids. Sexually mature T. amplivasatus were found throughout the study period, but mature mated specimens were more abundant during late summer and autumn. It is estimated that from 120 to 150 days is spent, by this species, in the cocoon and individuals may reach maturity in less than one year. There was some indication of individuals with regressed genital organs indicating that they may live longer than one year. At the 27 m station T. amplivasatus is part of a complex and well developed benthic community. Temporal variation in this species was highly correlated to that of other major taxa (bivalves, ophiuroids).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027549
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Pollution and tidal benthic communities of the James River Estuary, Virginia (1989)
    Springer
    Hydrobiologia 180 (1989), S. 195-211 
    Details
    ISSN: 1573-5117
    Keywords: estuaries ; tidal freshwater ; pollution impacts ; aquatic oligochaetes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Distribution of benthic communities in the estuarine portion of the James River was controlled mainly by salinity. Pollution effects were localized and difficult to assess because of a rigorous physical environment. Mesohaline and oligohaline communities were very similar to those in other estuaries of the eastern United States. Macrobenthic densities were most severely depressed in tidal freshwater habitats near Richmond & Hopewell, where the major portion of the pollution load enters the river. Cluster analysis of species distributional patterns and ordination of pollution and physical parameters produced similar results, dividing the river into mesohaline, oligohaline, and upper and lower tidal freshwater zones. Further analysis of only the tidal freshwater portion indicated the distribution of benthic communities reflected the location and concentration of pollution sources along the river. Tidal freshwater communities were dominated by the Asiatic clam, Corbicula fluminea, tubificid oligochaetes of the genus Limnodrilus and the chironomid insect larva Coelotanypus scapularis. The fauna of the freshwater zones was very eurytopic with respect to sediment type and has a great resemblance to the fauna of eutrophic lakes. The classical concept of a sharp increase in number of species occurring from oligohaline to freshwater zones was found to be misleading. This increase does not occur until free flowing (or lotic) freshwater areas of greater habitat diversity are reached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027553
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    Paper (German National Licenses)
    Fulltext
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