Caffrey M.A.,04 Burchfiel Geography Building |
Horn S.P.,04 Burchfiel Geography Building |
Orvis K.H.,04 Burchfiel Geography Building |
Haberyan K.A.,Northwest Missouri State University
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2015
We inferred environmental changes over the middle to late Holocene in coastal north Hispaniola using pollen, microscopic charcoal, mollusk shells, and diatoms in an 8.5-m sediment core from Laguna Saladilla, Dominican Republic (19°39' N, 71°42' W; ~ 2 m above sea level). Changes in Rhizophora (red mangrove) pollen percentages and in mollusk and diatom assemblages indicate major changes in salinity and water depth related to relative sea level rise and possible shifts in precipitation. Rhizophora percentages were highest at 7650 cal yr BP, when mollusk shells indicate the lake was connected to the Atlantic Ocean. Laguna Saladilla became progressively brackish ca. 3500 cal yr BP, and transitioned ca. 2500 cal yr BP to its current freshwater condition. High percentages of Amaranthaceae pollen and increased charcoal concentrations over the last ca. 2500 years signal dry climate and increased fires in coastal north Hispaniola. Geomorphological changes over time at Laguna Saladilla partially mask evidence of climate change in the proxies examined, and the record is equivocal before 2500 cal yr BP. Evidence for drier conditions since 2500 cal yr BP is consistent with late-Holocene shifts in the mean position of the Intertropical Convergence Zone (ITCZ) that have been identified on the Caribbean side of Hispaniola. We interpret the record as indicating that ITCZ migratory dynamics may also have affected precipitation on the Atlantic edge of the Greater Antilles. © 2015 Elsevier B.V.
Ernst K.M.,04 Burchfiel Geography Building |
van Riemsdijk M.,04 Burchfiel Geography Building
Applied Geography | Year: 2013
This article studies the participation of stakeholders in climate change decision-making in Alaska's National Parks. We place stakeholder participation within literatures on environmental and climate change decision-making. We conducted participant observation and interviews in two planning workshops to investigate the decision-making process, and our findings are three-fold. First, the inclusion of diverse stakeholders expanded climate change decision-making beyond National Park Service (NPS) institutional constraints. Second, workshops of the Climate Change Scenario Planning Project (CCSPP) enhanced institutional understandings of participants' attitudes towards climate change and climate change decision-making. Third, the geographical context of climate change influences the decision-making process. As the first regional approach to climate change decision-making within the NPS, the CCSPP serves as a model for future climate change planning in public land agencies. This study shows how the participation of stakeholders can contribute to robust decisions, may move climate change decision-making beyond institutional barriers, and can provide information about attitudes towards climate change decision-making. © 2013 Elsevier Ltd.