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Spatial genetic pattern in an economically beneficial insect, the cyclical African wild silk moth (Gonometa postica)
Item type: Journal Article • Journal: African Zoology • Authors: Timothy C. Bray --- Department of Zoology and Entomology, South AfricaThe African wild silk moth (Gonometa postica) exhibits large inter-annual population size fluctuations in the Kalahari region of southern Africa. Spent cocoons from this species are currently being utilized in a local silk industry. An understanding of the recolonization dynamics... -
Spatial distribution of male display sites in a North African population of Houbara Bustard Chlamydotis undulata undulata
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Mohsen Chammem --- Institut des Regions Arides, Tunisia Mohsen Jarray --- Institut des Regions Arides, Tunisia Touhami Khorchani --- Institut des Regions Arides, TunisiaUnderstanding the effect of habitat characteristics on the distribution of threatened species are fundamental in conservation planning and management. Here, we explore the spatial distribution pattern of display site by the North African Houbara Bustard Chlamydotis undulata undulata males. For... -
Spatial considerations when monitoring reef fishes
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa H Winker --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa ATF Bernard --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa MKS Smith --- South African National Parks, Rondevlei Scientific Services, South Africa A Götz --- South African Environmental Observation Network (SAEON), South AfricaSpatial dependence can obscure relationships between response and explanatory variables because of structuring within the residuals reducing variance and biasing coefficient estimates. Here, we highlight the influence of the spatial component, in the presence of spatial dependence, on abundance trends... -
Density effect on growth variables of eucalypt clones in a Nelder wheel experiment
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Franciele Alba da Silva --- , Brazil Sylvio Péllico Netto --- , Brazil Alexandre Behling --- , Brazil Henrique Soares Koehler --- , Brazil Ataídes Marinheski Filho --- , Brazil Cláudio Cerqueira --- , BrazilNelder’s systematic design enables studies of tree plantation spacing in relatively small areas, which is of great interest for forest planning. However, dependence between observations can arise with this method, making it difficult to use classic statistics for evaluating an... -
Mixed-effect modelling of Tectona grandis L.f. yield at stand-level
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Lucas Araujo Moura --- Federal University of Paraná, Brazil Allan Libanio Pelissari --- Federal University of Paraná, Brazil Luan Demarco Fiorentin --- Federal University of Paraná, Brazil Vinicius Costa Cysneiros --- Federal University of Santa Catarina, Brazil Luciano Rodrigo Lanssanova --- Federal Institute of Science, Technology and Education of Mato Grosso, Brazil Sidney Fernando Caldeira --- Federal University of Mato Grosso, BrazilThe prediction of volume from commercial plantations is essential to manage Tectona grandis L.f. stands. However, the assumptions of regression, especially homoscedasticity and residual independence, are often ignored when fitting longitudinal regression models. Thus, this work aimed to build a...