نتایج جستجو برای: latitude
تعداد نتایج: 16503 فیلتر نتایج به سال:
In a recent article in this Journal, Loehlin, McFadden, Medland, and Martin (2006) investigated the relationship between latitude and digit ratio (2D:4D) first commented upon by Manning (2002). Manning suggested that inter-ethnic differences in mean digit ratio were a function of latitude, with populations at intermediate latitudes having the highest digit ratios and those at the equator and at...
We used ion drift observations from the DE-2 satellite to study for the first time the longitudinal variations of middle and low latitude F region zonal plasma drifts during quiet and disturbed conditions. The quiet-time middle latitude drifts are predominantly westward; the low latitude drifts are westward during the day and eastward at night. The daytime quiet-time drifts do not change much w...
As invading species expand, they eventually encounter physical and biotic stressors that limit their spread. We examine latitudinal and climatic variation in physiological tolerance in one native and two invading populations of Drosophila subobscura. These flies are native to the Palearctic region, but invaded both South and North America around 1980 and spread rapidly across 15° of latitude on...
Evolutionary hypotheses to explain the greater numbers of species in the tropics than the temperate zone include greater age and area, higher temperature and metabolic rates, and greater ecological opportunity. These ideas make contrasting predictions about the relationship between speciation processes and latitude, which I elaborate and evaluate. Available data suggest that per capita speciati...
are not comparable with measures of the fainter and more remote systems. The surprisingly small dispersion about the curve again emphasizes the general similarity in linear dimensions of the globular clusters of the galactic system. The plotted crosses refer to clusters whose computed distances involve only the earlier measures of diameter and integrated magnitudes; the distances for the others...
3 Authors: Minliang Jin † ([email protected]), Xiangguo Liu † 4 ([email protected]), Wei Jia ([email protected]), Haijun Liu ([email protected]), 5 Wenqiang Li ([email protected]), Yong Peng ([email protected]), Yanfang 6 Du ([email protected]), Yuebin Wang ([email protected]), 7 Yuejia Yin ([email protected]), Xuehai Zhang ([email protected]), Qing Liu 8 ([email protected]), Min Deng...
Biotic interactions underlie ecosystem structure and function, but predicting interaction outcomes is difficult. We tested the hypothesis that biotic interaction strength increases toward the equator, using a global experiment with model caterpillars to measure predation risk. Across an 11,660-kilometer latitudinal gradient spanning six continents, we found increasing predation toward the equat...
1. Because many large mammal species have wide geographical ranges, spatially distant populations may be confronted with different sets of environmental conditions. Investigating how home range (HR) size varies across environmental gradients should yield a better understanding of the factors affecting large mammal ecology. 2. We evaluated how HR size of a large herbivore, the roe deer (Capreolu...
Here, we report the complete genome sequence of Glaciecola psychrophila strain 170(T), a novel species of the genus Glaciecola, isolated from sea ice at high-latitude Arctic locations. The genome consists of a single chromosome (5,413,691 bp) and 5,363 genes. The genomics information will facilitate the study of the physiology, cold adaptation, and evolution of this genus.
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