Counter gradient variation

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WebJun 1, 1995 · Countergradient variation is a geographical pattern of genotypes (with respect to environments) in which genetic influences on a trait oppose … WebCountergradient is a type of phenotypic plasticityCountergradient variation is a type of phenotypic plasticity that occurs when the phenotypic variation determined by a …

Countergradient variation in growth rate: compensation for ... - PubMed

WebSelection on growth rate results from sizedependent winter mortality: the importance to winter survival of being large increases with latitude but the length of the growing season … WebCountergradient variation is a geographic pattern in which genetic variation in a trait compensates for environmental variation, such that phenotypic variation among … manulife vitality for individuals

Co-Gradient Variation in Growth Rate and Development Time of …

WebThe end result is countergradient variation in growth rate, a phenomenon that may be much more widespread than currently recognized. Download to read the full article text … WebJun 18, 2024 · Environmental temperature is a key driver of variation in developmental physiological rates in reptiles. Cooler temperatures … WebApr 17, 2014 · Differences in biological and growth rate parameters among populations have also been reported to be due to two types of variations viz. CoGV (Cogradient variation) and CnGV (Counter gradient ... kpmg ny offices

(PDF) Evidence of countergradient variation in the growth …

Web1) Atlantic silversides (Menidia menidia) display counter gradient variation in growth rate. During their growing seasons, northern populations grow far faster and larger than their … WebFeb 1, 2004 · Countergradient variation, wherein organisms' phenotypes counter environmentally induced effects along a gradient such as temperature, indicates a remarkable ability for traits to be finetuned to ... manulife vietnam officeWebJun 15, 2024 · Counter-gradient genetic variation: Genetically based differences in the phenotype expressed by populations in a common environment that oppose the natural (geographic) cline. Geographic cline: Variation in a phenotype expressed in wild populations across a geographic (e.g., latitude or elevation) gradient. manulife vision claim form canada

"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 seasonality. Because of this, it is thought that countergradient variation of growth is a means to compensate for the short amount of … See more The following are among the discovered cases of countergradient variation. The species name is followed by the trait affected and the … 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 common way to test for both of these patterns is with transplant experiments. … See more 1. ^ Conover, David; Schultz, Eric (1995). "Phenotypic similarity and the evolutionary significance of countergradient variation". Trends in Ecology … See more " - Counter gradient variation

Counter gradient variation

Intra- vs. Interspecific Latitudinal Variation in Growth ... - JSTOR

WebNov 13, 2002 · Counter-gradient variation has been reported in a wide variety of ectotherms, such as fish, amphibians, reptiles, mollusks, and insects (e.g., Conover and … Webthe group outlined the evolutionary significance of counter-gradient variation and described 20 prior studies with results consistent with countergradient variation, though generally without the original authors formally describing their observations as such [13]. The early work highlighted in that review and subsequent research substantiate a ...

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WebCounter Gradient Selection and Latitudinal Aspects of Physiological Variation . Some Useful References. home. Berven, K. A., and D. E. Gill. 1983. ... Countergradient variation in growth rate: compensation for length of the growing season among Atlantic silversides from different latitudes. Oecologia, 83:316-324. Conover, D. O., and E. T ... WebOct 11, 2010 · We found strong counter-gradient variation in aerobic scope between locations in four species from two families (Pomacentridae and Apogonidae). High-latitude populations (Heron Island, southern ...

WebJan 1, 2006 · National Center for Biotechnology Information WebCounter-gradient variation can arise when there is a trade-off between traits or processes in order to compensate for detrimental effects of the environmental gradient on performance, such as that induced by temperatures above a population’s thermal optima [21,22]. For example, physiological

WebJul 28, 2024 · This pattern indicates countergradient variation (figure 1b,f), wherein environment and genotype are opposed to one another . In contrast with CnGV, sites where the mean temperature during spawning was greatest yielded the highest thermal optima (T opt). In this context, T opt exhibits cogradient variation—the genotype and environment … WebMCA is closely linked to countergradient variation, a phenomenon whereby life history traits such as growth, development and feeding rate and body size are elevated in high latitude compared to ...

WebNov 13, 2002 · Counter-gradient variation has been reported in a wide variety of ectotherms, such as fish, amphibians, reptiles, mollusks, and insects (e.g., Conover and Present 1990;Laugen et al. 2003;Du et al ...

WebDec 15, 2014 · Environmental temperature has profound effects on the biological performance and biogeographical distribution of ectothermic species. Variation of this abiotic factor across geographic gradients is expected to produce physiological differentiation and local adaptation of natural populations depending on their thermal … kpmg offers tax planning guideWebApr 23, 2024 · This process can result in a latitudinal cline in genetic contributions to traits known as counter-gradient genetic variation, whereby latitudinal variation in the genetic contribution to a trait exhibits the opposite trend from latitudinal variation in the environmental effect on the expressed phenotype [14, 20, 34]. Genetic compensation … manulife vitality active rewardsWebJul 16, 2014 · I read somewhere people write gradient in covariant form because of their proposes. I think gradient expanded in covariant basis i , j , k so by invariance nature of … manulife vitality group benefits appWebDec 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 . manulife vitality garminWebcountergradient variation: individuals collected from shaded wetlands developed up to 12% faster than those collected from relatively unshaded wetlands. The results of this study … kpmg ny office addressWebOct 11, 2010 · Counter-gradient variation can arise when there is a trade-off between traits or processes in order to compensate for detrimental effects of the environmental gradient … kpmg offerWebCountergradient variation refers to a geographic pattern of variation in which genetic inﬂuences on a trait oppose environmental inﬂuences across an environ-mental gradient, thereby reducing phenotypic change across the gradient (Levins, 1969; Conover & Schultz, 1995). Such a negative covariance between environ- manulife vitality points explained