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40 results found
Information from plots surveyed by U.S.D.A., Forest Service, Forest Inventory and Analysis (FIA) units provides a basis for classifying human-dominated ecosystems at the regional scale of resolution.Attributes include forest stand measures, evidence of human influence, and other disturbances.Data…
Author(s): Victor A. Rudis, John B. Tansey
Keywords: disturbances, forest productivity, harvest, management, ownership
Source: Ecological land classification:applications to identify the productive potential of Southern forests: Proceedings of a symposium; 1991 January 7-9; Charlotte, NC
Year: 1991
This study investigated the hypothesis that air pollution is causing mortality of the larger overstory trees, which results in a shift in species composition. To determine if the theorized shifts in species composition have occurred, this study compared historical changes in forest composition as…
Author(s): Jim Steinman
Keywords: mixed mesophytic forest, tree mortality, succession, disturbances, air pollutants
Source: USDA Forest Service NA-TP-04-99 Northeastern Area
Year: 1999
Banner-tailed kangaroo rats (Dipodomys spectabilis) are prominent ecosystem engineers that build large mounds that influence the spatial structuring of fungi, plants, and some ground-dwelling animals. Ants are diverse and functionally important components of arid ecosystems; some species are also…
Author(s): R. L. Schooley, B. T. Bestelmeyer, J. F. Kelly
Keywords: ecosystem engineers, disturbances, formicidae, Heteromyidae, spatial scale
Source: Oecologia. 125: 142-149.
Year: 2000
We studied the ecological characteristics of 45.50-yr-old subtropical dry forest stands in Puerto Rico that were growing on sites that had been deforested and used intensively for up to 128 yr. The study took place in the Guánica Commonwealth Forest. Our objective was to assess the long-term…
Author(s): Sandra Molina Colon, Ariel E. Lugo
Keywords: alien species, biomass, Caribbean forests, disturbances, dry forests, land-use change, litterfall, plant diversity, Puerto Rico, rehabilitation, secondary succession, subtropical forests
Source: BIOTROPICA 38(3) :354–364
Year: 2006
Massive upstream migrations of neritid snails (Neritidae: Gastropoda) occur in tropical and subtropical streams worldwide, but their seasonality and proximate causes are unknown. We monitored massive upstream migrations of Neritina virginea for 99 weeks, and conducted a detailed study of snail…
Keywords: Neritid snails, diadromy, physical habitat, disturbances, Neotropical streams
Source: Caribbean Journal of Science, Vol. 41, No. 1, 55-74,
Year: 2005
The forests of the Sierra Nevada have been altered for millennia by climate, natural disturbances, and more recently by the activities of humans. Management of these forests and their resources as ecosystems to meet diverse objectives, requires an understanding of the conditions under which…
Author(s): William F. Laudenslayer, Carl N. Skinner
Keywords: climate change, disturbances, ecosystems, forests, Holocene, management, Pleistocene, Sierra Nevada
Year: 1995
Conserving biological diversity in a changing climate poses major challenges for land managers and society. Effective adaptive strategies for dealing with climate change require a socioecological systems perspective. We highlight some of the projected ecological responses to climate change in the…
Author(s): Thomas A. Spies, Thomas W. Giesen, Frederick J. Swanson, Jerry F. Franklin, Denise Lach, K. Norman Johnson
Keywords: landscape management, disturbances, regional planning, adaptive management, environmental laws
Source: Landscape Ecology. 25(8): 1185-1199
Year: 2010
Forest insects and pathogens are major disturbance agents that have affected millions of hectares in North America in recent decades, implying significant impacts to the carbon (C) cycle. Here, we review and synthesize published studies of the effects of biotic disturbances on forest C cycling in…
Author(s): Jeffrey A. Hicke, Craig D. Allen, Ankur R. Desai, Michael C. Dietze, Ronald J. Hall, Edward H. Hogg, Daniel M. Kashian, David Moore, Kenneth F. Raffa, Rona N. Sturrock, James Vogelmann
Keywords: carbon cycling, disturbances, insects, pathogens
Source: Global Change Biology. 18: 7-34. doi: 10.1111/j.1365-2486.2011.02543.x
Year: 2011
Recent climate variability (increasing temperature, droughts) and atmospheric composition changes (nitrogen deposition, rising CO2 concentration) along with harvesting, wildfires, and insect infestations have had significant effects on U.S. forest carbon (C) uptake. In this study, we attribute C…
Author(s): Fangmin Zhang, Jing M. Chen, Yude Pan, Richard A. Birdsey, Shuanghe Shen, Weimin Ju, Liming He
Keywords: N deposition, carbon sink and source, climate change, disturbances, elevated CO2, forest age
Source: Journal of Geophysical Research: Biogeosciences
Year: 2012
The project goal is to understand how multiple disturbance events including fire, insect outbreaks, and climate variability interact in space and time, and how they combine to influence forest species composition, spatial structure, and tree population dynamics in high elevation forests of the…
Author(s): Christopher O'Connor, Donald A. Falk, Ann M. Lynch, Craig P. Wilcox, Thomas W. Swetnam, Tyson L. Swetnam
Keywords: disturbances, high elevation forests, Pinaleno Mountains
Source: RJVA 07-JV-11221615317 Performance Report. Tucson, AZ: University of Arizona, Laboratory of Tree-Ring Research; School of Natural Resources and the Environment. 21 p.
Year: 2010