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  • 1
    Electronic Resource
    Electronic Resource
    Influence of cultivation and food concentration on body length of calanoid copepods (1982)
    Springer
    Marine biology 71 (1982), S. 157-161 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The cephalothorax length of the marine pelagic Copepoda Acartia clausi Giesbrecht, Temora longicornis (Müller), Centropages hamatus (Lilljeborg) and Pseudocalanus sp. was monitored at 15°C during prolonged cultivation through up to 55 filial generations and at different concentrations of food. The length of T. longicornis decreased considerably during the first 15 generations and remained rather constant thereafter. In the other species, body length increased slightly or remained almost constant. Genetic changes are probably involved. Food concentration influenced body size of all species, particularly C. hamatus, in which 80% of the natural size range may be explained by differences in food concentration. The idea that temperature is a dominant factor in determining the length of copepods should be reconsidered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394624
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Zooplankton distribution in the coastal upwelling system along the Banc d'Arguin, Mauritania (1993)
    Springer
    Hydrobiologia 258 (1993), S. 133-149 
    Details
    ISSN: 1573-5117
    Keywords: zooplankton ; copepods ; upwelling ; Mauritania
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the framework of the Dutch Mauritania Expedition 1988, zooplankton was sampled in the beginning of the spring upwelling season at 44 stations along the Banc d'Arguin, Mauritania. Distribution patterns of oceanic and neritic copepod species and especially of the upwelling indicator Calanoides carinatus (Kröyer) were analysed in search for direct proof of circulation of ocean upwelling water over the inshore banks. The vertical temperature distribution at the stations pointed to upwelling in two different parts of the shelf area. According to the copepod data the two upwellings were of a different nature. A restricted area at the shelf edge near Cap Timiris appeared to represent a relatively stable coastal upwelling situation. Upwelled water present near Cap Blanc was found to have traveled quite recently over a considerable part of the shelf. In the central area between the two upwellings, ‘Banc-water’ extended from the shelf into the ocean. The possible impact of the observed circulation of ocean water on productivity of the shelf benthic system is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006192
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of temperature and food concentration on body size, weight and lipid content of two Calanoid copepod species (1988)
    Springer
    Hydrobiologia 167-168 (1988), S. 201-210 
    Details
    ISSN: 1573-5117
    Keywords: copepods ; temperature ; food ; size ; weight ; lipid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two species of Copepoda Temora longicornis (Müller) and Pseudocalanus elongatus (Boeck) were cultured continuously in the laboratory. Four and three generations, respectively, were raised at 16 different combinations of temperature and food concentration. Prosome length and ash-free dry weight were measured in the adult stage and in Pseudocalanus also in copepodite stage I, and the relation between length and weight was established. In Pseudocalanus also the relative amount of lipid was estimated. Prosome length and length-specific body weight (condition factor) were positively correlated with food concentration. Lipid content in Pseudocalanus was also strongly affected by the concentration of food. Prosome length was negatively correlated with temperature. However, length-specific body weight in Temora was positively correlated with temperature. Therefore, at higher temperature Temora was smaller, but heavier per unit body length. In Pseudocalanus a similar but less significant influence of temperature on length-specific weight was found; lipid content was not significantly influenced by the temperature. Females of Temora had larger length-specific weights than males. In Pseudocalanus the opposite was found, coinciding with a higher lipid content in males than in females. It is discussed that at natural concentrations of phytoplankton body size and weight of copepods are reduced in the North Sea during the major part of the growing-season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026306
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Daily egg production ofTemora longicornis (Copepoda, Calanoida) during winter and early spring in the Marsdiep (Southern North Sea) (1991)
    Springer
    Aquatic ecology 25 (1991), S. 61-64 
    Details
    ISSN: 1573-5125
    Keywords: copepod reproduction ; spring population dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mature females of the copepodTemora longicornis from the Marsdiep tidal inlet were incubated at ambient water temperature during the winter of 1989/1990 to estimate their egg production during 24 hours. Throughout winter this production remained at a level of 0 to 10 eggs per female. In March a steep rise to 60 to 80 eggs coincided with an equally steep rise in chlorophyll-a from 4 to 20 μg.l−1. Excess food given during incubation tended to increase the observed production rate only in October at relatively high temperature. Additive effects of rising food level and temperature on daily egg production were found in spring. In March and April 1988 and 1990 the observed maximum daily egg production per female increased from about 20 at 5°C and 5 μg.l−1 chlorophyll to 70 at almost 10°C and 20 μg.l−1. The egg production in winter gives a prebloom potential to maintain a stock of premature stages ready to utilize the algal spring bloom. Early spawning before April can also contribute to the development of the abundance peak of adults in May–June. Due to growth rates increasing with temperature in the months March and April, most of the adults at their peak density may have hatched from eggs before the period of maximum egg production rate at the end of April. The exceptionally high production rate observed at the end of March may be related to a developingPhaeocystis bloom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259590
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    Paper (German National Licenses)
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