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Volume 8 - November 1992

Contents

Page 4 of 5

Book Review

Short Communication

Research Article

Rapid Communication

Book Review

Announcement

  • EcoCiencia – Ecuador

  • Danilo Silva Chiriboga
  • Published online by Cambridge University Press:
    10 July 2009, p. 114
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Short Communication

Rapid Communication

Book Review

Other

Book Review

Research Article

  • Aggregation and synecology of arboreal arthropods associated with an overstorey rain forest tree in Australia

  • Yves Basset
  • Published online by Cambridge University Press:
    10 July 2009, pp. 317-327

  • The cohesion of the arthropod community associated with the rain forest tree Argyrodendron actinophyllum was studied in a warm subtropical rain forest in Australia. The distribution of most arthropods was contagious on the foliage of A. actinophyllum. Chewers and phloem-feeders were more clumped than epiphyte grazers and parasitoids. Arthropod predator-prey ratios were high and relatively constant over time, as revealed by measures of their activity. However, similar ratios in abundance and species-richness of arthropods foraging on foliage showed high variability in space and no consistent trends. Species associations on the foliage were difficult to predict and did not constitute either a single, well-united community or well-delimited subcommunitics. Most of the data suggest that on the foliage of A. actinophyllum, the cohesion of the arthropod community is not extremely strong. Apart from methodological constraints, possible reasons for this include the influence of host-tree phenology, and the high arthropod-diversity of the rain forest environment.

Short Communication

Book Review

Other

Research Article

  • The effects of tree canopy cover on soil fertility in a Nigerian savanna

  • Augustine Onwuegbukiwe Isichei, Joseph Ikechukwu Muoghalu
  • Published online by Cambridge University Press:
    10 July 2009, pp. 329-338

  • The effect of tree canopy cover on soil properties was studied over three periods: middry season (January), mid-growth period (August) and peak-growth period (October) in three 1 ha plots in savanna of north-west Nigeria. The objective was to find out whether tree canopies change the nutrient status of the soil under them relative to adjacent grasslands. Soils under tree canopies were found to have significantly higher levels of organic matter, calcium, magnesium, potassium, total exchangeable bases, cation exchange capacity and pH than those in open grasslands. Nitrogen and phosphorus were slightly higher in soils under tree canopies than those in the open grasslands. Trees 7 m and above had more influence on soil properties than smaller trees. Differences in soil properties among the study plots were due to differences in their soil texture. Seasonal trends were observed in organic matter, carbon: nitrogen ratio, cation exchange capacity, phosphorus, calcium, sodium, total exchangeable cations and percentage base saturation.

Book Reviews

Other

Page 4 of 5