Results 101 to 110 of about 17,678 (274)
Optimism and pessimism: a concept for behavioural ecology
Biological Reviews, EarlyView.ABSTRACT Originating from human psychology, the concepts of “optimism” and “pessimism” were transferred to animal welfare science about 20 years ago to study emotional states in non‐human animals. Over time, “optimism” and “pessimism” have developed into valuable welfare indicators, but little focus has been put on the ecological implications of this ...
Viktoria Siewert +3 more
wiley +1 more source
Cryptobia iubilans in Cichlids
EDIS, 2014 After many years of diagnostics at the University of Florida and at other laboratories around the country, it appears that Cryptobia iubilans is not uncommon among cichlids, and that environmental and other factors determine the extent of disease. This revised 3-page fact sheet was written by Ruth Francis-Floyd and Roy Yanong, and published by the UF ...
Ruth Francis-Floyd, Roy Yanong
openaire +3 more sources
A Phylogenetic Index for Cichlid Microsatellite Primers [PDF]
International Journal of Zoology, 2010 Microsatellites abound in most organisms and have proven useful for a range of genetic and genomic studies. Once primers have been created, they can be applied to populations or taxa that have diverged from the source taxon. We use PCR amplification, in a 96-well format, to determine the presence and absence of 46 microsatellite loci in 13 cichlid ...
Robert D. Kunkle +2 more
openaire +3 more sources
Cladistics, EarlyView.Abstract Proteocephalids are a cosmopolitan and diverse group of tapeworms (Cestoda) that have colonized vertebrate hosts in freshwater and terrestrial environments. Despite the ubiquity of the group, key macroevolutionary processes that have driven the group's evolution have yet to be identified.
Philippe Vieira Alves +7 more
wiley +1 more source
Evolution &Development, EarlyView.By performing a genetic association study in cave × surface fish F2 hybrids, we discovered that premaxilla width, dentary length, and maxillary length are all significantly associated with a region on Chromosome 13 containing 109 genes. ABSTRACT The regulation of bone size is a poorly understood and complex developmental process.
Amanda K. Powers +7 more
wiley +1 more source
Lake Tanganyika--a 'melting pot' of ancient and young cichlid lineages (Teleostei: Cichlidae)? [PDF]
PLoS ONE, 2015 A long history of research focused on the East Africa cichlid radiations (EAR) revealed discrepancies between mtDNA and nuclear phylogenies, suggesting that interspecific hybridisation may have been significant during the radiation of these fishes.
Juliane D Weiss +2 more
doaj +1 more source
Computer Simulations to Study Sympatric Speciation Processes [PDF]
arXiv, 2005 We perform simulations based on the Penna model for biological ageing, now with the purpose of studying sympatric speciation, that is, the division of a single species into two or more populations, reproductively isolated, but without any physical barrier separating them.
arxiv
Genome Biology and Evolution, 2019 Why sex chromosomes turn over and remain undifferentiated in some taxa, whereas they degenerate in others, is still an area of ongoing research. The recurrent occurrence of homologous and homomorphic sex chromosomes in distantly related taxa suggests ...
A. Böhne +6 more
semanticscholar +1 more source
Convict cichlids benefit from close proximity to another species of cichlid fish [PDF]
Biology Letters, 2008 The coexistence of species with overlapping resource use is often thought to involve only negative fitness effects as a consequence of interspecific competition. Furthermore, the scarce empirical research on positive species interactions has predominantly focused on sessile organisms.
openaire +3 more sources
Water Biology and Security, 2023 The introduction of species is a leading cause of biodiversity loss and habitat alteration. Several species have invaded Mexican freshwater ecosystems, adversely affecting native fishes.
M. Franco +4 more
doaj