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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Types Citation (2) Contacts Allen, Craig D Allstott, Eric J Barrow, Wylie Burkett, Virginia R Doyle, Thomas More... Categories Publication (2) View Results as: JSON ATOM CSV

Nonlinear dynamics in ecosystem response to climatic change: Case studies and policy implications Many biological, hydrological, and geological processes are interactively linked in ecosystems. These ecological phenomena normally vary within bounded ranges, but rapid, nonlinear changes to markedly different conditions can be triggered by even small differences if threshold values are exceeded. Intrinsic and extrinsic ecological thresholds can lead to effects that cascade among systems, precluding accurate modeling and prediction of system response to climate change. Ten case studies from North America illustrate how changes in climate can lead to rapid, threshold-type responses within ecological communities; the case studies also highlight the role of human activities that alter the rate or direction of system... Categories: Publication; Types: Citation, Journal Citation; Tags: Climate change, Ecological Complexity, Ecosystems, Natural resource management, Nonlinear dynamics, All tags... Thresholds, Fewer tags Ecosystem Responses to Nitrogen Deposition in the Colorado Front Range We asked whether 3?5 kg N y?1 atmospheric N deposition was sufficient to have influenced natural, otherwise undisturbed, terrestrial and aquatic ecosystems of the Colorado Front Range by comparing ecosystem processes and properties east and west of the Continental Divide. The eastern side receives elevated N deposition from urban, agricultural, and industrial sources, compared with 1?2 kg N y?1 on the western side. Foliage of east side old-growth Englemann spruce forests have significantly lower C:N and lignin:N ratios and greater N:Mg and N:P ratios. Soil % N is higher, and C:N ratios lower in the east side stands, and potential net N mineralization rates are greater. Lake NO3 concentrations are significantly higher... Categories: Publication; Types: Citation, Journal Citation; Tags: Colorado, Ecosystems, N isotopes, Rocky Mountains, Springer New York, All tags... alpine and subalpine lakes, diatoms, nitrogen, paleolimnology, sub-alpine forest, Fewer tags