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  • 2000-2004  (1)
  • 1980-1984  (1)
  • 1940-1944
  • African grasses  (1)
  • Agonistic  (1)
  • 1
    Electronic Resource
    Electronic Resource
    African Grass Invasion in the Americas: Ecosystem Consequences and the Role of Ecophysiology (2000)
    Springer
    Biological invasions 2 (2000), S. 123-140 
    Details
    ISSN: 1573-1464
    Keywords: African grasses ; ecophysiology ; ecosystem effects ; global change ; invasions ; pasture conversion ; tropical America
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Clearing of natural vegetation for pastures and the deliberate introduction of African grasses constitute significant threats to the biological diversity of the tropics, subtropics, and warm temperate regions of the Americas. African grasses have escaped from cultivated pastures and revegetated rangeland sites and invaded natural areas at alarming rates. Invaded ecosystems tend to be biotically impoverished and differ markedly from adjacent non-invaded areas in structure and function. Effects of pasture creation and invasion by African grasses on ecosystem processes (transformation and flux of energy and matter) are primarily related to loss of woody species and changes in the fire regime. However, the ecophysiological attributes of the African grasses (e.g. high biomass allocation to leaves, high growth rate, and high leaf-level gas exchange rates) also have important consequences. Here we describe the extent of pasture creation with African grasses and their invasive spread in the New World and review ecological effects of these land-cover changes. We highlight a number of comparative ecophysiological studies within the context of mechanisms responsible for invasion by African grasses and resulting ecosystem change.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010040524588
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Breeding behavior and early life history of the waccamaw killifish,Fundulus waccamensis (1983)
    Springer
    Environmental biology of fishes 8 (1983), S. 293-300 
    Details
    ISSN: 1573-5133
    Keywords: Breeding season ; Nuptial dichromatism ; Courtship ; Agonistic ; Territorial ; Sexual behavior ; Mating ; Gonadal development ; Eggs ; Larvae ; Egg burying ; Cyprinodontid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis The territorial, courtship and spawning behavior ofFundulus waccamensis was investigated in the field and laboratory. Spawning occurs from April to August. Sexual dimorphism is manifested through dichromatism, genitalia, morphometric differences and contact structures. In nature, nuptial males vigorously defend circular territories and court entering females by circling them, sidling, ‘J’ shaping and spawning in the sand substrate. In the aquarium, males perform eight advertisement motor patterns during courtship, of which dipping and flashing are most frequent. The female is relatively inactive, performing only two basic acts. The maximum number of mature eggs per ovary is 120. Both mature egg numbers and total egg numbers are highly correlated with standard length. Recently fertilized eggs are colorless and adhesive. The newly hatched young is well developed and relatively large in size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00001095
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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