Results 81 to 90 of about 40,938 (241)
پژوهشهای علوم دامی ایران, 2016 This study was carried out to study the inbreeding coefficient and its effect on reproductive performance of dairy cows (age at first calving, calving interval and open days) in Isfahan province.
S. Gholizadeh +3 more
doaj
An indirect approach to the extensive calculation of relationship coefficients
Genetics Selection Evolution, 2002 A method was described for calculating population statistics on relationship coefficients without using corresponding individual data. It relied on the structure of the inverse of the numerator relationship matrix between individuals under investigation ...
Colleau Jean-Jacques
doaj +1 more source
When does female multiple mating evolve to adjust inbreeding? : Effects of inbreeding depression, direct costs, mating constraints, and polyandry as a threshold trait [PDF]
, 2016 Ackowledgements: This work was funded by a European Research Council Starting Grant to JMR. All simulations were performed using the Maxwell computing cluster at the University of AberdeenPeer reviewedPublisher ...
Bocedi, Greta +2 more
core +2 more sources
A century of theories of balancing selection
Biological Reviews, EarlyView.ABSTRACT Traits that affect organismal fitness are often highly genetically variable. This genetic variation is vital for populations to adapt to their environments, but it is also surprising given that nature – after all – ‘selects’ the best genotypes at the expense of those that fall short.
Filip Ruzicka +10 more
wiley +1 more source
Analysis of DNA profiles of ash (Fraxinus excelsior L.) to provide evidence of illegal logging [PDF]
, 2017 The present work formed part of a research project supported by the General Directorate of State Forests (Grants BLP-333 and BLP-384). We gratefully acknowledge the Forest Guard staff from Śnieżka Forest District for their efficient cooperation.
Borys, Malgorzata +4 more
core +2 more sources
Conservation Science and Practice, EarlyView.Abstract Bird communities in oceanic islands tend to evolve under reduced predation, making them extremely susceptible to introduced predators. Príncipe Island (São Tomé and Príncipe, Central Africa) harbors 11 endemic bird species and eight introduced mammal species.
Patrícia Guedes +8 more
wiley +1 more source
Population Structure and Cryptic Relatedness in Genetic Association Studies [PDF]
, 2009 We review the problem of confounding in genetic association studies, which arises principally because of population structure and cryptic relatedness. Many treatments of the problem consider only a simple ``island'' model of population structure. We take
Astle, William, Balding, David J.
core +4 more sources
Environmental stress influences reproductive success in male spider mites
Ecological Entomology, EarlyView.This experiment explores how male juvenile food stress impacts reproductive traits in the haplodiploid spider mite Tetranychus urticae. Males exposed to juvenile food stress had lower reproductive success and females mated to these males also suffered reduced fitness as they were not able to produce optimal offspring sex ratios. The negative effects of
Elsa Noël +4 more
wiley +1 more source
Variable social organization and breeding system of a social parrot revealed by genetic analysis
Ibis, EarlyView.Social organization and contributions to reproduction vary widely within and between species that breed in groups. Such variation often arises from the process of group formation, which drives patterns of relatedness and hence the degree of social conflict and co‐operation between group members.
Francesca S. E. Dawson Pell +4 more
wiley +1 more source
Environmental factors influence both abundance and genetic diversity in a widespread bird species. [PDF]
, 2013 Genetic diversity is one of the key evolutionary variables that correlate with population size, being of critical importance for population viability and the persistence of species. Genetic diversity can also have important ecological consequences within
Boettcher R. +8 more
core +3 more sources