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  • 1
    Electronic Resource
    Electronic Resource
    Life history adaptations of phyllopods in response to predators, vegetation, and habitat duration in north-eastern Natal (1991)
    Springer
    Hydrobiologia 212 (1991), S. 105-116 
    Details
    ISSN: 1573-5117
    Keywords: phyllopods ; temporary pools ; life history strategies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phyllopod populations were monitored in three temporary pools differing in the amount of submerged, peripheral vegetation present, surface area and duration. The effects of these factors on the life history strategies employed by phyllopods were investigated. Triops granarius, various conchostracan species and the anostracan Branchipodopsis sp. inhabited the periphery of two pools where rooted, submerged vegetation was abundant while three Streptocephalus species dominated the central, unvegetated regions of the pools and the unvegetated pool. This distribution pattern appeared to be related to the animals' morphology and feeding habits. The peripheral regions of the pools were stressful habitats since they were colonized by large numbers of predators and competitors 30–40 days after inundation and they dried out sooner than the centre. The ‘peripheral’ species exhibited typical r-selected life history strategies; they grew rapidly, reproduced early and had short lifespans and in this way they overcame the threats presented by their habitat. The ‘central’ species took advantage of their predator-free, more stable habitat and exhibited life history patterns which tended towards the K-end of the r-K continuum. A degree of intraspecific variation in growth and reproduction was obvious and appeared to be related to differences in habitat duration of the three pools.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025993
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Physical and chemical characteristics and phyllopod fauna of temporary pools in north-eastern Natal, Republic of South Africa (1991)
    Springer
    Hydrobiologia 212 (1991), S. 95-104 
    Details
    ISSN: 1573-5117
    Keywords: South Africa ; temporary pools ; physico-chemistry ; phyllopods
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fourteen phyllopod (Branchiopoda: Crustacea) species were collected from numerous temporary pools in north-eastern Natal, South Africa. Physical and chemical data for 10 pools, and results for hourly (over 41 hours) and 3-day interval (throughout periods when phyllopods were present) monitoring of 3 study pools are presented. Comparisons were made with other pools with phyllopods in Africa. The data reveal the broad tolerance to variation and extremes in both physical and chemical conditions in African temporary waterbodies. Species diversity appears to be related to pool size and vegetation. Phyllopod distribution does not follow a pattern associated with physical and chemical conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025992
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Freshwater snails of East Caprivi and the lower Okavango River Basin in Namibia and Botswana (1992)
    Springer
    Hydrobiologia 246 (1992), S. 9-40 
    Details
    ISSN: 1573-5117
    Keywords: Mollusca ; Gastropoda ; freshwater snails ; taxonomy ; distribution ; Africa ; Namibia ; Botswana ; Okavango River
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A systematic account is given of the aquatic gastropod fauna of the lower Okavango River in Namibia and Botswana, and of the East Caprivi area in Namibia, based on collections made mostly in 1983–86 from about 100 different sites. A total of 20 living species are reported, 9 of them for the first time from this area: Bellamya monardi, Lobogenes michaelis, Cleopatra elata, Afrogyrus coretus, Segmentorbis angustus, S. kanisaensis, Bulinus scalaris, B. depressus and B. tropicus. All are found outside this area and most are widely distributed Afrotropical species. Some do not occur farther south than the Okavango Delta, while others reach a south-western limit here but occur at greater latitude in the eastern tropical corridor on the coast of Natal. Bulinus globosus and Biomphalaria pfeifferi occur throughout the study area and are intermediate hosts for schistosome parasites of man and livestock.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005620
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Environmental correlates of gastrointestinal parasitism in montane and lowland baboons in Natal, South Africa (1993)
    Springer
    International journal of primatology 14 (1993), S. 623-635 
    Details
    ISSN: 1573-8604
    Keywords: Papio cynocephalus ursinus ; parasitism ; food shortage ; diet
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We compared the gastrointestinal parasites of the baboon,Papio cynocephalus ursinus, living in montane (altitude, 〉1800 m) and coastal lowland (altitude, 100–200 m) habitats in Natal, South Africa, using fecal analysis. While the montane animals harbored a smaller number of species, helminth egg-output rates were higher in them than in the lowland animals. The decrease in parasite diversity with increasing altitude was expected, but the difference in helminth egg output was not. It may be due to a combination of food shortage, which characterizes the montane environment, especially at the end of winter, and the high proportion of soil-contaminated items in the diets of the montane animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02215451
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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