نتایج جستجو برای: human activities

تعداد نتایج: 1949621  

2014
Aurelie Lacoeuilhe Nathalie Machon Jean-François Julien Agathe Le Bocq Christian Kerbiriou

Anthropogenic light pollution is an increasingly significant issue worldwide. Over the past century, the use of artificial lighting has increased in association with human activity. Artificial lights are suspected to have substantial effects on the ecology of many species, e.g., by producing discontinuities in the territories of nocturnal animals. We analyzed the potential influence of the inte...

2004
John A. Stanturf Dale D. Wade Thomas A. Waldrop

Other than land clearing for urban development (Wear and others 1998), no disturbance is more common in southern forests than fire. The pervasive role of fire predates human activity in the South (Komarek 1964, 1974), and humans magnified that role. Repeating patterns of fire behavior lead to recognizable fire regimes, with temporal and spatial dimensions. Understanding these fire regimes is es...

2012
Tao Cheng Donggen Wang

Spatio-temporal phenomena used to be represented in Cartesian Coordinate Systems, and time is perceived linear. This way of representing time may not be appropriate for representing and analysing some types of natural and human phenomena, which occur in time cycles. This paper thus proposes the use of polar coordinate systems. Polar angles are used to represent time, which can be clock time at ...

2017
Manuel Alcaraz-Castaño Javier Alcolea-González Martin Kehl Rosa-María Albert Javier Baena-Preysler Rodrigo de Balbín-Behrmann Felipe Cuartero Gloria Cuenca-Bescós Fernando Jiménez-Barredo José-Antonio López-Sáez Raquel Piqué David Rodríguez-Antón José Yravedra Gerd-Christian Weniger

INTRODUCTION AND OBJECTIVES Although the Iberian Peninsula is a key area for understanding the Middle to Upper Paleolithic transition and the demise of the Neandertals, valuable evidence for these debates remains scarce and problematic in its interior regions. Sparse data supporting a late Neandertal persistence in the Iberian interior have been recently refuted and hence new evidence is needed...

2015
Cole G. Easson Kenan O. Matterson Christopher J. Freeman Stephanie K. Archer Robert W. Thacker Robert Toonen

Recent studies have renewed interest in sponge ecology by emphasizing the functional importance of sponges in a broad array of ecosystem services. Many critically important habitats occupied by sponges face chronic stressors that might lead to alterations in their diversity, relatedness, and functional attributes. We addressed whether proximity to human activity might be a significant factor in...

Journal: :PLoS Biology 2004
Steven L Chown Brent J Sinclair Hans P Leinaas Kevin J Gaston

1701 Penguins have been receiving a lot of bad press lately. They are considered somehow counter, spare, strange. Unlike most plant and animal groups, they do not show a peak of species richness towards the equator and a decline towards the poles. This more conventional spatial pattern is conveniently known as the latitudinal diversity gradient because of the strong covariance of richness and o...

Journal: :Science 2015
Seth Finnegan Sean C Anderson Paul G Harnik Carl Simpson Derek P Tittensor Jarrett E Byrnes Zoe V Finkel David R Lindberg Lee Hsiang Liow Rowan Lockwood Heike K Lotze Craig R McClain Jenny L McGuire Aaron O'Dea John M Pandolfi

Marine taxa are threatened by anthropogenic impacts, but knowledge of their extinction vulnerabilities is limited. The fossil record provides rich information on past extinctions that can help predict biotic responses. We show that over 23 million years, taxonomic membership and geographic range size consistently explain a large proportion of extinction risk variation in six major taxonomic gro...

Journal: :Journal of anatomy 2010
Dahlia W Zaidel

Art is a uniquely human activity associated fundamentally with symbolic and abstract cognition. Its practice in human societies throughout the world, coupled with seeming non-functionality, has led to three major brain theories of art. (1) The localized brain regions and pathways theory links art to multiple neural regions. (2) The display of art and its aesthetics theory is tied to the biologi...

Journal: :Journal of the experimental analysis of behavior 2009
Timothy D Hackenberg

An increasingly popular view among philosophers of science is that of science as action-as the collective activity of scientists working in socially-coordinated communities. Scientists are seen not as dispassionate pursuers of Truth, but as active participants in a social enterprise, and science is viewed on a continuum with other human activities. When taken to an extreme, the science-as-socia...

2011
Ana Maria Carvalho Amélia Frazão-Moreira

Many European protected areas were legally created to preserve and maintain biological diversity, unique natural features and associated cultural heritage. Built over centuries as a result of geographical and historical factors interacting with human activity, these territories are reservoirs of resources, practices and knowledge that have been the essential basis of their creation. Under socia...

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