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Countergradient variation

WebApr 6, 2024 · After correcting for general allometric variation in cranial size, we found that in both North American Peromyscus mice and African laminate-toothed (Otomys) rats, … WebSep 9, 2016 · Our results suggest that behavioural adjustments to the environment can produce countergradient variation in physiological traits. More broadly, our work …

Thermoregulatory behaviour explains countergradient variation …

WebJun 1, 1995 · Countergradient variation is a geographical pattern of genotypes (with respect to environments) in which genetic influences on a trait oppose … WebJun 1, 1995 · Countergradient variation is a geographical pattern of genotypes (with respect to environments) in which genetic influences on a trait oppose environmental influences, thereby minimizing phenotypic change along the gradient. Phenotypic similarity across changing environments ought to be of intense interest because it belies … gtech hospitalar https://pffcorp.net

Genetic factors have a major effect on growth, number of ... - PLOS

Countergradient variation is a type of phenotypic plasticity that occurs when the phenotypic variation determined by a biological population's genetic components opposes the phenotypic variation caused by an environmental gradient. This can cause different populations of the same … See more Countergradient variation, originally termed "contra-gradient variation", was coined by Richard Levins in his 1968 book Evolution in Changing Environments. Levins first used the term when describing patterns of body … See more Populations that inhabit high latitudes experience shorter growing seasons than those that inhabit low latitudes due to the differences in … See more 1. ^ Conover, David; Schultz, Eric (1995). "Phenotypic similarity and the evolutionary significance of countergradient variation". Trends in Ecology & Evolution. 10 (6): 248–252. doi:10.1016/s0169-5347(00)89081-3. PMID 21237029. 2. ^ Levins, Richard … See more The following are among the discovered cases of countergradient variation. The species name is followed by the trait affected and the environmental gradient studied. See more Countergradient variation is the opposite of cogradient variation, in which the environmental effect on the phenotype enhances the genetic effect on the phenotype. One … See more WebMay 1, 2002 · The common-environment experiments revealed countergradient variation: maximum growth rate increased with latitude both within and among species. However, growth reaction norms of the northern species were shifted to a lower range of temperatures than those of the southern species, indicating adaptation to temperature at the … WebApr 6, 2024 · After correcting for general allometric variation in cranial size, we found that in both North American Peromyscus mice and African laminate-toothed (Otomys) rats, highland rodents had smaller endocranial volumes than lower-elevation rodents, consistent with the expensive tissue hypothesis. In the former group, Peromyscus mice, crania were ... gtech hoover bags price

Mechanisms Influencing Countergradient Variation in Prairie …

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Countergradient variation

Genetic factors have a major effect on growth, number of ... - PLOS

WebJun 18, 2024 · Yet, for locally-adapted populations, genetic variation can oppose environmental variation across ecological gradients, known as countergradient variation (CnGV). Biologists often seek to understand the presence of phenotypic variation, yet the absence of such variation across environmental gradients can also reveal insights into … WebConversely, countergradient variation (CnGV) occurs when covariance is negative: that is, genetic and environmental influences on phenotypes oppose one another, thereby diminishing the change in ...

Countergradient variation

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WebSep 9, 2016 · Our results suggest that behavioural adjustments to the environment can produce countergradient variation in physiological traits. More broadly, our work underscores the importance of interactions between environment, behaviour, and physiology in ectotherms. Understanding these interactions will be crucial in assessing vulnerability … WebDec 9, 2024 · Such countergradient variation has been suggested to represent adaptation to seasonality, or shorter favourable seasons in colder climates. Alternatively, populations from cold climates may outgrow those from warmer climates at low temperature, and vice versa at high temperature, representing adaptation to temperature .

Webcompared in a common environment for countergradient variation, and vice versa for cogradient variation. Counter- and cogradient variation constitute forms of cryptic local adaptation because their true genetic effect on phenotypic variation is masked by the environment [12–15] (figure 1). Countergradient variation can be particularly WebAug 26, 2024 · Countergradient variation (CnGV) in physiological traits exists among populations of broad-ranging ectotherms. Relatively few studies, however, have …

WebJan 11, 2024 · Countergradient variation, i.e., the inverse relationship between environmental conditions and individual growth response , can maintain morphological … WebJul 14, 2016 · A covariant vector is commonly a vector whose components are written with ``downstairs" index, like x μ. Now, the gradient is defined as ∂ μ := ∂ ∂ x μ. As you can …

WebSpatial and temporal scales of adaptive divergence in marine fishes and the implications for conservation

WebNov 13, 2002 · This adds to the number of studies showing that countergradient variation may not just be a macrogeographic phenomenon but can occur on microgeographic scales as well (Trussell 2002, Skelly 2004 ... gtech hoover filtersWebAfter correcting for general allometric variation in cranial size, we found that in both North American Peromyscus mice and African laminate-toothed (Otomys) rats, highland rodents had smaller endocranial volumes than lower-elevation rodents, consistent with the expensive tissue hypothesis. In the former group, Peromyscus mice, crania were ... find a vcrWebJun 18, 2024 · Countergradient variation can reduce the costs of development associated with cool temperatures via variation in … find a vanity numberWebCountergradient variation in growth rate: compensation for length of the growing season among Atlantic silversides from different latitudes David O. Conover & Teresa M. C. … find avaya sold to numberWebMay 7, 2012 · The nature of the countergradient pattern is that geographical variation in the carotenoid content of the orange spots of males is counterbalanced by genetic … find a vector equation for the ellipseWebJun 29, 2015 · Our findings indicate that countergradient growth variation can occur even in relatively slowly evolving fishes, such as gars (family Lepisosteidae), and that … find avast on this computerWebclimate-correlated variation in CT max in this species appears to be the result of phenotypic plasticity rather than heritable variation, and, (5) most of the climate-correlated variation in CT max could be explained by the sunskink’s thermal preference. Taken together, these results suggest an intriguing chain of causality: it appears thermal gtech hoovers special offers