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  • Articles  (2)
  • Population abundance  (1)
  • species richness  (1)
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  • Articles  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The effects of forest disturbance on diversity of tropical soil nematodes (1997)
    Springer
    Oecologia 111 (1997), S. 575-582 
    Details
    ISSN: 1432-1939
    Keywords: Key words Nematodes ; Trophic groups ; Population abundance ; Species richness
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We provide the first account of the effects of forest disturbance on species richness of nematodes in tropical forest soils, from 24 sites along gradients of disturbance and regeneration in the Mbalmayo Forest Reserve, Cameroon. Species richness was very high. Samples of 200 nematodes from individual soil cores contained a maximum of 89 and an average of 61 species; in total we recorded 431 species and approximately 194 genera. The model of Siemann et al. (1996), predicting that species richness scales as the number of individuals I 0.5, underestimates nematode diversity 4–6 fold in these samples. Over 90% of specimens cannot be assigned to known species. Although nematode species richness declined with forest disturbance, statistically significant effects were detectable only under the most extreme conditions (active slash-and-burn agriculture and complete mechanical forest clearance) and even here remained at 40% of the richness of near primary sites. Impacts on trophic structure were also small, and there were no significant changes in the maturity index (MI) (Bongers 1990) with disturbance (mean MI across all treatments was very high, at 3.58). In the light of this study, the problems of completing reliable all-taxon inventories in tropical forests are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420050274
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon flux and diversity of nematodes and termites in Cameroon forest soils (1996)
    Springer
    Biodiversity and conservation 5 (1996), S. 261-273 
    Details
    ISSN: 1572-9710
    Keywords: ecosystem function ; carbon flux ; tropical forest ; species richness ; soil invertebrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Theoretically, there are three principal ways in which ecosystem processes might respond to reductions in species richness. These theories are reviewed, and then considered in the context of a study of the diversity of soil nematodes and termites in near-primary forest sites at Mbalmayo, Cameroon, and the contribution made by these two taxa to carbon fluxes (CO2 and CH4) from the forest floor. Nematode abundances average 2.04 × 106 m-2, and termites between 2933 and 6957 m-2. The site is the most species-rich yet investigated for both groups anywhere in the world, so that a very large number of species contribute to carbon fluxes. We speculate about how much ‘redundancy’ might be built into the functioning of both assemblages, and point out the enormous difficulties of resolving such questions, and of producing such detailed species-inventories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00055835
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    Paper (German National Licenses)
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