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 … 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 simultaneously decreases. The end result is countergradient variation in growth rate, a phenomenon that may be much more widespread than currently recognized.
Maladaptive plasticity facilitates evolution of thermal …
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 Webversely with length of the growing season (i.e., countergradient variation). A third alter-native is a mixed strategy involving both of the above. We hypothesized that the form of local adaptation may be affected by constraints that vary within vs. among species. We used common-environment experiments to compare reaction norms for growth in ... lawn mower tractor for sale south africa
Intra- vs. Interspecific Latitudinal Variation in Growth ... - JSTOR
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 ... WebCountergradient variation is a geographic pattern in which genetic variation in a trait compensates for environmental variation, such that phenotypic variation among … 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 … kangertech toptank mini lowest price