نتایج جستجو برای: d pulex
تعداد نتایج: 578103 فیلتر نتایج به سال:
Understanding the response of organisms to multiple stressors is critical for predicting if populations can adapt to rapid environmental change. Natural and anthropogenic stressors often interact, complicating general predictions. In this study, we examined the interactive and cumulative effects of two common environmental stressors, lowered calcium concentration, an anthropogenic stressor, and...
Anthropogenic surface and ground water contamination by chemicals is a global problem, there an urgent need to develop tools identify elucidate biological effects. Contaminants of emerging concern (CECs) are not typically monitored or regulated those with known suspected endocrine disrupting potential have been termed (EDCs). Many CECs be neurotoxic (e.g., insecticides) many incompletely charac...
Biological invasions are known to be among the most important threats long-term conservation of native biota, and their effects might even more difficult contrast when they cryptic, i.e., non-native invaders cannot easily recognised based on morphology, can thus confused with taxa. Such cryptic widely occur in cladoceran genus Daphnia O.F. Müller, 1785, so that actual distribution status specie...
Population structure can be described by genotypic-correlation coefficients between groups of individuals, the most basic of which are the pairwise relatedness coefficients between any two individuals. There are nine pairwise relatedness coefficients in the most general model, and we show that these can be reduced to seven coefficients for biallelic loci. Although all nine coefficients can be e...
We describe the draft genome of the microcrustacean Daphnia pulex, which is only 200 megabases and contains at least 30,907 genes. The high gene count is a consequence of an elevated rate of gene duplication resulting in tandem gene clusters. More than a third of Daphnia's genes have no detectable homologs in any other available proteome, and the most amplified gene families are specific to the...
[This corrects the article DOI: 10.1016/j.gdata.2016.04.002.].
The complexity of food webs poses a significant hurdle for our growing understanding of the structure and dynamics of ecological communities. Empirical methods that measure the per capita strengths of trophic species interactions offer a means to identify keystone species and bridge mathematical models and data to synthesize our knowledge of population dynamics and predator feeding behaviors. M...
Rapid growth could significantly reduce methylmercury (MeHg) concentrations in aquatic organisms by causing a greater than proportional gain in biomass relative to MeHg (somatic growth dilution). We hypothesized that rapid growth from the consumption of high-quality algae, defined by algal nutrient stoichiometry, reduces MeHg concentrations in zooplankton, a major source of MeHg for lake fish. ...
In an effort to elucidate the evolutionary mechanisms that determine the genetic architecture of a species, we have analyzed 17 populations of the microcrustacean Daphnia pulex for levels of genetic variation at the level of life-history characters and molecular markers in the nuclear and mitochondrial genomes. This species is highly subdivided, with approximately 30% of the variation for nucle...
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