Arlt, D. 2007. Habitat selection: Demography and Individual Decisions. Doctor’s dissertation. ISSN 1652-6880, ISBN 978-91-576-7316-9 Habitat selection is the behavioural process determining the distribution of individuals among habitats varying in quality, thus affecting individual fitness and population growth. Models of population dynamics often assume that individuals have perfect knowledge ...

Two experiments were conducted to examine the effects of broiler breeder dietary grain source and cage density on maternal antibody (MatAb) transfer to progeny in 2 genetic strains (A and B). Broiler breeders were assigned to 16 litter floor pens and fed either corn- or wheat-based diets. Breeders were administered 4 live vaccines against Newcastle disease virus (NDV). At 23 wk of age, pullets ...

Introduction The whitefly Bemisia tabaci Genn. (Homoptera:Aleyrodidae) has caused millions of dollars worth of crop losses in tropical and subtropical agricultural regions in the five continents of the world (Brown, 1994). Besides the direct damage caused by B. tabaci (plant nutrient loss; physiological disorders; honey dew excretions, etc), the sweet potato or cotton whitefly is an efficient v...

terminal heat and drought are the main constraints for wheat production in the vast and diverse semi-tropical rainfed regions of iran. high temperature stress during wheat’s reproductive stage is particularly detrimental, reducing both individual kernel weight and kernel number. identification of adapted genotypes can improve grain yield and its stability under heat stress conditions. selection...

Phenotypic divergences of birds are common between urban and natural habitats can result from different selective pressures or maladaptation to the city. No uniform patterns were observed, especially concerning markers bird health, such as, for example, telomere length. Telomeres involved in maintaining genome integrity naturally shorten with age, but environmental stressors accelerate their at...

Correlations between early- and late-life performance are a major prediction of life-history theory. Negative early–late correlations can emerge because biological processes optimized for early but not late life (e.g., rapid development may accelerate the onset senescence; “developmental theory aging”) or allocation to early-life comes at cost in terms (as disposable soma theory). But variation...