Results 211 to 220 of about 149,533 (252)

Do modern hunter-gatherers live in marginal habitats?

Journal of Archaeological Science: Reports, 2019
Abstract Anthropologists often assert that modern hunter-gatherer societies have been relegated to marginal habitats compared to their agricultural neighbors, with the implication that modern social organization and behavior provide little insight into Paleolithic hunter-gatherers.
Andrew J Cunningham, Steven Worthington, Richard W Wrangham   +2 more
exaly   +2 more sources

How marginal are forager habitats?

Journal of Archaeological Science, 2007
Abstract It is frequently suggested that human foragers occupy ‘marginal’ habitats that are poor for human subsistence because the more productive habitats they used to occupy have been taken over by more powerful agriculturalists. This would make ethnographically described foragers a biased sample of the foragers who existed before agriculture and ...
Claire C. Porter, Frank W. Marlowe
openaire   +1 more source

Marginal and Subgingival Plaque - A Natural Habitat of Tropheryma whipplei ?

Infection, 2003
DNA of Tropheryma whipplei, the etiologic agent of Whipple's disease, has recently been detected in the saliva of healthy subjects. In this pilot study we searched for the habitat of T. whipplei within the oral cavity.Samples from different oral sites were obtained from periodontically healthy volunteers, patients with progressive periodontitis and ...
Zinkernagel, A S, Gmür, R, Fenner, L, Schaffner, A, Schoedon, G, Schneemann, M   +5 more
openaire   +3 more sources

Sex‐Biased Dispersal and Adaptation to Marginal Habitats

The American Naturalist, 2003
If gene flow occurs through both sexes but only females contribute to population growth, adaptation to marginal (sink) habitats should be differentially affected by male versus female dispersal. Here I address this problem with two models. First, I consider the fate of a rare allele that improves fitness in the marginal habitat but reduces fitness in ...
openaire   +4 more sources

Marginal habitats of chimpanzees

Journal of Human Evolution, 1983
(1) This paper aims to define the marginal habitat of the chimpanzee before the advent of man-made bushfires and agriculture. (The numbers in this abstract refer to the sections of the paper). (2) Written inquiries and personal interviews resulted in a map of the geographical range of the chimpanzee.
openaire   +1 more source

Margins of agricultural fields as habitats for pollinating insects

Agriculture, Ecosystems & Environment, 1992
Abstract The occurrence of pollinating insects in field margins with different vegetation was studied in field experiments. Some margins were widened and vegetation was established by sowing of leguminous plants or was allowed to invade spontaneously.
Jan Lagerlöf, Josef Stark, Birgitta Svensson   +2 more
openaire   +1 more source

On reduced size in spiders from marginal habitats

Oecologia, 1981
Four heathland spider species, Agroeca proxima, Centromerita concinna, Theridion simile, and Philodromus histrio, were studied in the Kalmthout National Nature Reserve in northern Belgium. They were caught by pitfall trapping or sweeping in different Calluna heath plots where the vegetation was in varying stages of development after being burnt, mowed,
openaire   +2 more sources

Ancient Colonization of Marginal Habitats

2016
The present contribution deals with the concepts of marginal habitats in selected regions of the ancient world, ranging from modern Spain to the Jordanian desert and from Turkey to the Ethiopian highlands. Central to this research is the hypothesis that the occupation of areas beyond the ‘normal’ settlement patterns corresponds to colonization ...
Bebermeier, Wiebke, Beck, Dennis, Gerlach, Iris, Klein, Torsten, Knitter, Daniel, Kohlmeyer, Kay, Krause, Jan, Marzoli, Dirce, Meister, Julia, Müller-Neuhof, Bernd, von Rummel, Philipp, Dorothée, Sack, Schmid, Stephan G. , Wulf-Rheidt, Ulrike, Schütt, Brigitta, Näser, Claudia   +15 more
openaire   +1 more source

Petroleum habitats of the Atlantic margin of South Africa

Geological Society, London, Special Publications, 1999
Abstract Petroleum system logic is applied along South Africa’s western margin to improve understanding of the observed petroleum habitats and the evaluation of the area’s potential for hosting profitable hydrocarbons. Three major groups of source rocks are identified and, consequently, the source-centred petroleum systems and complementary ...
openaire   +1 more source

Cold seeps and benthic habitat on the Pacific margin of Canada

Continental Shelf Research, 2011
Cold seeps on the Pacific margin of Canada occur in 130 m water depth in an actively trawled region of Hecate Strait. The seep sites are located within a NW/SE orientated linear pockmark chain. Within the largest of the pockmarks, actively venting authigenic carbonate chimneys (mounds) occur, and the chimneys are surrounded by a wide halo of shells and
J. Vaughn Barrie, Sarah Cook, Kim W. Conway   +2 more
openaire   +1 more source