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Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
The Whale Pump: Marine Mammals Enhance Primary Productivity In A Coastal Basin, Joe Roman, James J. Mccarthy
The Whale Pump: Marine Mammals Enhance Primary Productivity In A Coastal Basin, Joe Roman, James J. Mccarthy
Rubenstein School of Environment and Natural Resources Faculty Publications
It is well known that microbes, zooplankton, and fish are important sources of recycled nitrogen in coastal waters, yet marine mammals have largely been ignored or dismissed in this cycle. Using field measurements and population data, we find that marine mammals can enhance primary productivity in their feeding areas by concentrating nitrogen near the surface through the release of flocculent fecal plumes. Whales and seals may be responsible for replenishing 2.3x104 metric tons of N per year in the Gulf of Maine's euphotic zone, more than the input of all rivers combined. This upward ''whale pump'' played a much larger …
A Hitchhiker's Guide To The Maritimes: Anthropogenic Transport Facilitates Long-Distance Dispersal Of An Invasive Marine Crab To Newfoundland, A. M.H. Blakeslee, C. H. Mckenzie, J. A. Darling, J. E. Byers, J. M. Pringle, J. Roman
A Hitchhiker's Guide To The Maritimes: Anthropogenic Transport Facilitates Long-Distance Dispersal Of An Invasive Marine Crab To Newfoundland, A. M.H. Blakeslee, C. H. Mckenzie, J. A. Darling, J. E. Byers, J. M. Pringle, J. Roman
Rubenstein School of Environment and Natural Resources Faculty Publications
Aim To determine timing, source and vector for the recent introduction of the European green crab, Carcinus maenas (Linnaeus, 1758), to Newfoundland using multiple lines of evidence.Location Founding populations in Placentia Bay, Newfoundland, Canada and potential source populations in the north-west Atlantic (NWA) and Europe. Methods We analysed mitochondrial and microsatellite genetic data from European and NWA populations sampled during 1999-2002 to determine probable source locations and vectors for the Placentia Bay introduction discovered in 2007. We also analysed Placentia Bay demographic data and shipping records to look for congruent patterns with genetic analyses. Results Demographic data and surveys suggested …
The Amazon Frontier Of Land-Use Change: Croplands And Consequences For Greenhouse Gas Emissions, Gillian L. Galford, Jerry Melillo, John F. Mustard, Carlos E.P. Cerri, Carlos C. Cerri
The Amazon Frontier Of Land-Use Change: Croplands And Consequences For Greenhouse Gas Emissions, Gillian L. Galford, Jerry Melillo, John F. Mustard, Carlos E.P. Cerri, Carlos C. Cerri
Rubenstein School of Environment and Natural Resources Faculty Publications
The Brazilian Amazon is one of the most rapidly developing agricultural frontiers in the world. The authors assess changes in cropland area and the intensification of cropping in the Brazilian agricultural frontier state of Mato Grosso using remote sensing and develop a greenhouse gas emissions budget. The most common type of intensification in this region is a shift from single-to double-cropping patterns and associated changes in management, including increased fertilization. Using the enhanced vegetation index (EVI) from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor, the authors created a green-leaf phenology for 2001-06 that was temporally smoothed with a wavelet filter. …
Protecting Degraded Rainforests: Enhancement Of Forest Carbon Stocks Under Redd+, David P. Edwards, Brendan Fisher, Emily Boyd
Protecting Degraded Rainforests: Enhancement Of Forest Carbon Stocks Under Redd+, David P. Edwards, Brendan Fisher, Emily Boyd
Rubenstein School of Environment and Natural Resources Faculty Publications
The likely Reducing Emissions from Deforestation and Degradation (REDD+) mechanism includes strategies for the enhancement of forest carbon stocks. Recent concerns have been expressed that such enhancement, or restoration, of forest carbon could be counterproductive to biodiversity conservation, because forests are managed as "carbon farms" with the application of intensive silvicultural management that could homogenize diverse degraded rainforests. Restoration increases regeneration rates in degraded forest compared to naturally regenerating forest, and thus could yield significant financial returns for carbon sequestered. Here, we argue that such forest restoration projects are, in fact, likely to provide a number of benefits to biodiversity …
Transient Social-Ecological Stability: The Effects Of Invasive Species And Ecosystem Restoration On Nutrient Management Compromise In Lake Erie, Eric D. Roy, Jay F. Martin, Elena G. Irwin, Joseph D. Conroy, David A. Culver
Transient Social-Ecological Stability: The Effects Of Invasive Species And Ecosystem Restoration On Nutrient Management Compromise In Lake Erie, Eric D. Roy, Jay F. Martin, Elena G. Irwin, Joseph D. Conroy, David A. Culver
Rubenstein School of Environment and Natural Resources Faculty Publications
Together, lake ecosystems and local human activity form complex social-ecological systems (SESs) characterized by feedback loops and discontinuous change. Researchers in diverse fields have suggested that complex systems do not have single stable equilibria in the long term because of inevitable perturbation. During this study, we sought to address the general question of whether or not stable social-ecological equilibria exist in highly stressed and managed lacustrine systems. Using an integrated human-biophysical model, we investigated the impacts of a species invasion and ecosystem restoration on SES equilibrium, defined here as a compromise in phosphorus management among opposing stakeholders, in western Lake …
Indigenous Lands, Protected Areas, And Slowing Climate Change, Taylor H. Ricketts, Britaldo Soares-Filho, Gustavo A.B. Da Fonseca, Daniel Nepstad, Alexander Pfaf, Annie Petsonk, Anthony Anderson, Doug Boucher, Andrea Cattaneo, Marc Conte, Ken Creighton, Lawrence Linden, Claudio Maretti, Paulo Moutinho, Roger Ullman, Ray Victurine
Indigenous Lands, Protected Areas, And Slowing Climate Change, Taylor H. Ricketts, Britaldo Soares-Filho, Gustavo A.B. Da Fonseca, Daniel Nepstad, Alexander Pfaf, Annie Petsonk, Anthony Anderson, Doug Boucher, Andrea Cattaneo, Marc Conte, Ken Creighton, Lawrence Linden, Claudio Maretti, Paulo Moutinho, Roger Ullman, Ray Victurine
Rubenstein School of Environment and Natural Resources Faculty Publications
No abstract provided.