Showing papers on "Undergrowth published in 1974"
TL;DR: Measurements of abiotic factors indicated that, in mineral soils, pH affected the incidence of most genera, but soil type, moisture content and altitude had little effect, and the presence of undergrowth in woods and forests was associated with significantly greater numbers of plant-parasitic nematodes.
Abstract: SUMMARY
A survey of the nematode genera associated with trees in Scotland showed that Tylenchus sensu lato, Aphelenchoides, Tylencholaimus, Trichodorus, Helicotylenchus, Rotylenchus, Criconemoides s.l., Hemicriconemoides, Tylencho-rhynchus, Pratylenchus and Paratylenchus s.l. were commonly found in soil samples collected from around the roots of coniferous and deciduous trees. Only Criconemoides s.l. appeared to have a significant preference for deciduous woods.
The presence of undergrowth in woods and forests was associated with significantly greater numbers of plant-parasitic nematodes.
Measurements of abiotic factors indicated that, in mineral soils, pH affected the incidence of most genera, but soil type, moisture content and altitude had little effect.
43 citations
Journal Article•
TL;DR: Ten girls, mature at birth, who suffered severe fetal growth retardation, but were without evidence of congenital disease, have been followed serially in growth and development for at least seven years, indicating that severe undergrowth in single-born infants, uncomplicated by acute asphyxia or congenitals disease, may not prejudice later mental development.
Abstract: Ten girls, mature at birth, who suffered severe fetal growth retardation (< third percentile), but were without evidence of congenital disease, have been followed serially in growth and development for at least seven years. The five infants whose head circumferences at 1 year of age were found to be at or below the tenth percentile had, on the average, an IQ of ten points below the five whose head growth had reached the 25th percentile or better. No neurologic handicaps or significant school deficits were encountered in either group. The mean IQ of 103 for the whole group in this small sample indicated that severe undergrowth in single-born infants, uncomplicated by acute asphyxia or congenital disease, may not prejudice later mental development.
30 citations
TL;DR: In this article, the results of mist-netting in the lower strata of logged and intact forest in May, August, and November/December 1973 showed that the number of insectivorous birds was large in the areas where selective logging occurred several years ago; and that two control areas and one recently logged area had similar compositions and densities of bird fauna.
Abstract: Bird populations were studied in experimental plots of silvicultural treatments in subtropical rainforest. The results of mist-netting in the lower strata of logged and intact forest in May, August, and November/December 1973 showed that the number of insectivorous birds was large in the areas where selective logging occurred several years ago; and that two control areas and one recently logged area had similar compositions and densities of bird fauna. The high density of birds in logged areas was associated with dense undergrowth and this was interpreted as part of their normal response to local tree falls and forest edge conditions. Selective logging, however, causes a much greater degree of disturbance to the forest than natural tree falls, and this has important implications in the management of rainforest for production and conservation.
26 citations