A5042163954- Parasite Biology and Host Interactions
- Genetic diversity and population structure
- Parasites and Host Interactions
- Fish Ecology and Management Studies
- Amphibian and Reptile Biology
- Helminth infection and control
- Genetic and phenotypic traits in livestock
- Marine and fisheries research
- Nematode management and characterization studies
- Animal Behavior and Reproduction
- Evolution and Genetic Dynamics
- Plant and animal studies
- Genomics and Phylogenetic Studies
- Aquaculture Nutrition and Growth
- Trace Elements in Health
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Species Distribution and Climate Change
- Wildlife Ecology and Conservation
- Antimicrobial Peptides and Activities
- Bat Biology and Ecology Studies
- Mollusks and Parasites Studies
- Fish Biology and Ecology Studies
- Reproductive biology and impacts on aquatic species
- Identification and Quantification in Food
- Animal and Plant Science Education
Oregon State University
2015-2024
Biocom
2014
Oregon Department of Fish and Wildlife
2013
Biomedical Research Institute
2012
Université de Perpignan
2008-2010
École Pratique des Hautes Études
2008-2010
Centre National de la Recherche Scientifique
2008-2010
Universidade de Santiago de Compostela
2006
Western Washington University
2004
United States Department of Agriculture
1999
Captive breeding is used to supplement populations of many species that are declining in the wild. The suitability and long-term survival from such programs remain largely untested, however. We measured lifetime reproductive success first two generations steelhead trout were reared captivity bred wild after they released. By reconstructing a three-generation pedigree with microsatellite markers, we show genetic effects domestication reduce subsequent capabilities by approximately 40% per...
Abstract Accumulating data indicate that hatchery fish have lower fitness in natural environments than wild fish. This decline can occur very quickly, sometimes following only one or two generations of captive rearing. In this review, we summarize existing on the wild, and investigate conditions under which rapid declines occur. The summary studies to date suggests: nonlocal stocks consistently reproduce poorly wild; use local for propagation generally perform better stocks, but often worse...
Captive breeding programs are widely used for the conservation and restoration of threatened endangered species. Nevertheless, captive-born individuals frequently have reduced fitness when reintroduced into wild. The mechanism these declines has remained elusive, but hypotheses include environmental effects captive rearing, inbreeding among close relatives, relaxed natural selection, unintentional domestication selection (adaptation to captivity). We a multigenerational pedigree analysis...
This study investigates the use of microsatellite loci for estimating relatedness between individuals in wild, outbred, vertebrate populations. We measured allele frequencies at 20 unlinked, dinucleotide-repeat a population wild mice (Mus musculus), and used these observed to generate expected distributions pairwise among full sib, half unrelated pairs individuals, as would be estimated from data. In this one should able discriminate full-sib dyads with least 97% accuracy, half-sib or better...
Abstract Mitochondrial DNA (mtDNA) sequence data were used to compare the population genetic structures of five species parasitic nematodes from three different hosts: Ostertagia ostertagi and Haemonchus placei cattle, H. contortus Teladorsagia circumcincta sheep, Mazamastrongylus odocoilei white-tailed deer. The parasites sheep cattle showed a pattern consistent with high gene flow among populations. parasite deer substantial subdivision isolation by distance. It appears that host movement...
Abstract Landscape features such as mountains, rivers, and ecological gradients may strongly affect patterns of dispersal gene flow among populations thereby shape population dynamics evolutionary trajectories. The landscape have a particularly strong effect on in amphibians because are thought to poor abilities. We examined genetic variation at six microsatellite loci Columbia spotted frogs ( Rana luteiventris ) from 28 breeding ponds western Montana Idaho, USA, order investigate the...
Abstract Biomphalaria snails are instrumental in transmission of the human blood fluke Schistosoma mansoni . With World Health Organization's goal to eliminate schistosomiasis as a global health problem by 2025, there is now renewed emphasis on snail control. Here, we characterize genome glabrata, lophotrochozoan protostome, and provide timely important information biology. We describe aspects phero-perception, stress responses, immune function regulation gene expression that support...
Abstract The genetic underpinnings associated with the earliest stages of plant and animal domestication have remained elusive. Because a genome-wide response to selection can take many generations, detectable changes may first manifest as heritable global patterns gene expression. Here, test this hypothesis, we measured differential expression in offspring wild first-generation hatchery steelhead trout ( Oncorhynchus mykiss ) reared common environment. Remarkably, find that there were 723...
Only relatively recently have researchers turned to molecular methods for nematode phylogeny reconstruction. Thus, we lack the extensive literature on evolutionary patterns and phylogenetic usefulness of different DNA regions nematodes that exists other taxa. Here, examine mtDNA reconstruction provide data can be used a priori character weighting or parameter specification in models sequence evolution. We estimated substitution pattern mitochondrial ND4 gene from intraspecific comparisons...
Supplementation of wild populations with captive-bred organisms is a common practice for conservation threatened populations. Yet it largely unknown whether such programmes actually help population size recovery. While negative genetic effect captive breeding that decreases fitness has been detected, there no direct evidence carry-over in their wild-born descendants, which would drag down the subsequent generations. In this study, we use parentage assignments to reconstruct pedigree and...
We examined the relative merits of mitochondrial DNA loci and ribosomal internal transcribed spacers for their use in prospecting cryptic species platyhelminth parasites. Sequence divergence at ITS1 ITS2 was compared with 2 mtDNA (NADH dehydrogenase-1 cytochrome c oxidase I) between closely related trematodes cestodes. Both accumulated substitutions substantially more slowly than mtDNA, which clearly shows a higher level among to intra-specific variation. Besides slow rate substitution,...
Population supplementation programs that release captive-bred offspring into the wild to boost size of endangered populations are now in place for many species. The use hatcheries supplementing salmonid has become particularly popular. Nevertheless, whether such actually increase remains unclear, and predictions fish drag down fitness remain untested. To address these issues, we performed DNA-based parentage analyses on almost complete samples anadromous steelhead (Oncorhynchus mykiss) Hood...
Abstract Little is known about what controls effective sizes and migration rates among parasite populations. Such data are important given the medical, veterinary, economic (e.g., fisheries) impacts of many parasites. The autogenic-allogenic hypothesis, which describes ecological patterns distribution, provided foundation on we studied effects life cycles distribution genetic variation within hypothesis states that parasites cycling only in freshwater hosts (autogenic cycle) will be more...
Abstract The effective population size is influenced by many biological factors in natural populations. To evaluate their relative importance, we estimated the number of breeders per year ( N b ) and generation e anadromous steelhead trout Oncorhynchus mykiss Hood River, Oregon (USA). Using demographic data genetic parentage analysis on an almost complete sample all adults that returned to river over 15 years (> 000 individuals), for 13 run three entire generations. results are as...
Control and elimination of schistosomiasis is an arduous task, with current strategies proving inadequate to break transmission. Exploration genetic approaches interrupt Schistosoma mansoni transmission, the causative agent for human intestinal in sub-Saharan Africa South America, has led genomic research snail vector hosts genus Biomphalaria. Few complete resources exist, African Biomphalaria species being particularly underrepresented despite this where majority S. infections occur. Here...