A total of 52,390 oligochaetes were collected from 40 stations in western Lake Erie in spring 1961. The population was composed of two families, Naididae and Tubificidae. Only six species of naidids were found. One, Paranais frici, is apparently new to the list of North American freshwater Naididae

distri-butions. We support the claim that inclusive fitness theory may not be sufficient to explain the evolution of cooperation. While cooperativity through honest signaling is sometimes achieved with tag-based relatedness, we suggest that the im-portance of tag-based mechanisms may not simply be due

distri-bution is controlled by interaction with solar ultraviolet radiation. Because the heliocentric velocity of the comet varies during its motion around the Sun, the Doppler effect shifts dif-ferent solar lines into and out of match with the OH transition frequencies. At some loca-tions the net

populations. The populations of larvae were compared to those of adults. Leatherjackets and crane flies were found to be correlated, as were A. obscurusclick beetle and wireworm populations. Annual variation in trap catches was observed. Populations were related at a number of spatial scales to cultural

This paper investigates positive and normative aspects of population distri-bution among cities when aggregate population is growing. On the positive level, the paper investigates how different allocation regimes, on the one hand, and different elasticities of substitution between housing

climate change in a context of high mobility CECILIA TACOLI ABSTRACT The impacts of climate change are likely to affect population distri-bution and mobility. While alarmist predictions of massive fl ows of refugees are not supported by past experiences of responses to droughts and extreme weather

a range of conditions such as the underlying population distri-bution, the number of items, the level of random error, and characteristics of items and item-sets. Each of these datasets is factor analysed in a variety of ways that are frequently used in the extant literature, or that are recommended

We use population genetics theory and computer simulations to demonstrate that population bottlenecks cause a characteristic mode-shift distortion in the distri-bution of allele frequencies at selectively neutral loci. Bottlenecks cause alleles at low frequency (,0.1) to become less abundant than

In this paper the effects on aggregate consumption of changes in the age distri-bution of the population are analysed empirically. Economic theories predict that age influences individuals ’ saving and consumption behaviour. Despite this, age structure effects are rarely controlled for in empirical

The large single nucleotide polymorphism (SNP) typing projects have provided an invaluable data resource for human population geneticists. Almost all of the available SNP loci, however, have been identified through a SNP discovery protocol that will influence the allelic distri-butions