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  • 1
    Electronic Resource
    Electronic Resource
    Population dynamics, growth and production of the neozoon Marenzelleria cf. viridis (Verrill, 1873) (Polychaeta: Spionidae) in a coastal water of the southern Baltic Sea (1997)
    Springer
    Aquatic ecology 31 (1997), S. 177-186 
    Details
    ISSN: 1573-5125
    Keywords: Marenzelleria ; Polychaetes ; macrozoobenthos ; abundance ; biomass ; population dynamics ; growth ; secondary production ; Baltic Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The propagation of an immigrant from North America, viz. the spionid Marenzelleria cf. viridis in the Darss-Zingst Bodden (DZB) (southern Baltic Sea), was studied at three stations from March 1992 to December 1995. Highest mean abundances (over 28 000 ind. m-2) and wet weights (400 g m-2) were recorded at station 2 in 1994. The spionid also reached its highest dominances in terms of biomass (40 to 90%) at this station, which was selected for the population dynamics, growth and secondary production studies. The spionid has a life span of about 3 years, and many individuals achieved sexual maturity after one year. Their growth curve is steepest during the first year of life, during which the animals grow to a length of about 180 segments. However, growth depression was observed during the ripening of the gametes in April, May and June. Secondary production was in the region of 55 to 85 g AFDW m-2 y-1. Productivity (P/B) varied considerably from generation to generation, ranging between 0 and 4.8 with an average between 1.2 and 1.6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009903521182
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  • 2
    Electronic Resource
    Electronic Resource
    Bibliography on the genus Marenzelleria and its geographical distribution, principal topics and nomenclature (1997)
    Springer
    Aquatic ecology 31 (1997), S. 233-258 
    Details
    ISSN: 1573-5125
    Keywords: Marenzelleria ; Polychaetes ; bibliography ; geographical distribution ; nomenclature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A bibliography is given for the genus Marenzelleria. All together, 236 publications were found dealing with M. viridis, M. wireni and M. jonesi and their synonyms. The contents of the publications are briefly reviewed in tabular form identifying the nomenclature used, the geographical distribution and the topic of the paper in each case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009967807978
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  • 3
    Electronic Resource
    Electronic Resource
    On the identity and distribution of two species of Marenzelleria (Polychaeta, Spionidae) in Europe and North America (1997)
    Springer
    Aquatic ecology 31 (1997), S. 137-148 
    Details
    ISSN: 1573-5125
    Keywords: Marenzelleria cf. wireni ; Polychaetes ; Marenzelleria cf. viridis ; systematics ; distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Discrepancies are known to exist between the reproduction biology and population genetic of various Marenzelleria spp. populations in North American regions and in the North Sea and Baltic Sea. Species identification is difficult, and their geographical distributions are far from clear. As the diagnostic features of the species are known to vary with growth, it was necessary to find some reference frame within which morphological differences could be understood. The total number of setigers of intact specimens and the total number of branchiate setigers of anterior fragments proved to be suitable parameters permitting morphological differentiation between previously genetically distinguished forms. The forms corresponded in several features to literature diagnoses of M. wireni and M. viridis. Additional features were found to facilitate reliable morphological differentiation between the two species. It was shown that the range of distribution of M. cf. wireni is restricted primarily to mesohaline to polyhaline regions (including the North Sea), whereas M. cf. viridis is found predominantly in oligohaline to mesohaline areas (including the Baltic Sea). This applies also to North American and, possibly, polar waters. The discovery of M. cf. viridis in an oligohaline reach of the Elbe estuary shows that the two species can exist parapatrically, at least in North Sea estuaries. Besides these two species, a third was found to occur sympatrically with M. cf. viridis in a North American estuary (Currituck Sound). No description of this species has been given as the specimen consisted only of an anterior fragment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009995119364
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