نتایج جستجو برای: anthropogenic activities

تعداد نتایج: 397759  

Journal: :Biology letters 2012
Isabelle Le Viol Frédéric Jiguet Lluis Brotons Sergi Herrando Ake Lindström James W Pearce-Higgins Jirí Reif Chris Van Turnhout Vincent Devictor

Biotic homogenization (BH) is a process whereby some species (losers) are systematically replaced by others (winners). While this process has been related to the effects of anthropogenic activities, whether and how BH is occurring across regions and the role of native species as a driver of BH has hardly been investigated. Here, we examine the trend in the community specialization index (CSI) f...

2004
Muhammad Fahim Khokhar Thomas Wagner

In this article, we present satellite data analysis of atmospheric Sulfur Dioxide (SO2) from volcanic eruptions and anthropogenic activities. Data from Global Ozone Monitoring Experiment (GOME) on board ERS-2 for the years 1996 to 2002 is analyzed using a DOAS based algorithm with the aim of retrieving SO2 Slant Column Densities (SCDs). Difficulties in the retrieval of SO2 SCDs due to instrumen...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2005
Terry L Root Dena P MacMynowski Michael D Mastrandrea Stephen H Schneider

Average global surface-air temperature is increasing. Contention exists over relative contributions by natural and anthropogenic forcings. Ecological studies attribute plant and animal changes to observed warming. Until now, temperature-species connections have not been statistically attributed directly to anthropogenic climatic change. Using modeled climatic variables and observed species data...

Journal: :The Science of the total environment 2015
David A Crook Winsor H Lowe Frederick W Allendorf Tibor Erős Debra S Finn Bronwyn M Gillanders Wade L Hadwen Chris Harrod Virgilio Hermoso Simon Jennings Raouf W Kilada Ivan Nagelkerken Michael M Hansen Timothy J Page Cynthia Riginos Brian Fry Jane M Hughes

Understanding the drivers and implications of anthropogenic disturbance of ecological connectivity is a key concern for the conservation of biodiversity and ecosystem processes. Here, we review human activities that affect the movements and dispersal of aquatic organisms, including damming of rivers, river regulation, habitat loss and alteration, human-assisted dispersal of organisms and climat...

2016
Martyn N. Futter Lars Högbom Salar Valinia Ryan A. Sponseller Hjalmar Laudon

We present a framework for evaluating and communicating effects of human activity on water quality in managed forests. The framework is based on the following processes: atmospheric deposition, weathering, accumulation, recirculation and flux. Impairments to water quality are characterized in terms of their extent, longevity and frequency. Impacts are communicated using a "traffic lights" metap...

Journal: :Environmental Science & Technology 2021

A strongly stratified water structure and a densely populated catchment make the Baltic Sea one of most polluted seas. Understanding its circulation pattern time scale is essential to predict dynamics hypoxia, eutrophication, pollutants. Anthropogenic 236U 233U have been demonstrated as excellent transient tracers in oceanic studies, but unclear input history inadequate long-term monitoring rec...

2013
Douglas P Chivers Fawaz Al-Batati Grant E Brown Maud C O Ferrari

Recent anthropogenic activities have caused a considerable change in the turbidity of freshwater and marine ecosystems. Concomitant with such perturbations are changes in community composition. Understanding the mechanisms through which species interactions are influenced by anthropogenic change has come to the forefront of many ecological disciplines. Here, we examine how a change in the avail...

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