2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 8:30 AM - 10:30 AM | TRACKING ONE-HUNDRED TWENTY YEARS OF LAND-USE CHANGES AND EXTREME-NATURAL EVENTS USING FOUR SEDIMENTARY RECORDS FROM LAKE COCIBOLCA (NICARAGUA) | Virtual Platform
TRACKING ONE-HUNDRED TWENTY YEARS OF LAND-USE CHANGES AND EXTREME-NATURAL EVENTS USING FOUR SEDIMENTARY RECORDS FROM LAKE COCIBOLCA (NICARAGUA)
Lake Cocibolca (Nicaragua), the largest freshwater lake in Central America, is of considerable socio-economic and ecological relevance. This currently eutrophic lake has a long history of anthropogenic and natural disturbances. Furthermore, a proposed interoceanic canal will cross the lake and therefore pose environmental threats and ecological impacts to this waterbody. To provide a retrospective assessment of the environmental history of this lake, prior to the proposed canal construction, we analysed four sedimentary records collected from strategic locations. We used changes in diatom composition, visible reflectance spectroscopy-inferred chlorophyll a, sand fraction percentage of the sediment matrix, and sediment accumulation rate (SAR), to track ~120 years of catchment disturbances. Diatom trends before 1980s suggest mesotrophic conditions, but after 1990s the prevalence of eutrophic turbid water conditions. Generally coherent post-1990s changes in diatom composition and large SAR/sand fraction increases suggest the nutrient flows entering the lake have increased in the past three decades. The rising occurrence of hurricanes crossing the lake might also play an important role in nutrient and sediment transport to the lake, driving lake productivity.
- Anthropogenic
- Stressor
- Land use
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Presenters/Authors
Camilo Fuentes Peña
(), PEARL Lab (Queen's University, Canada), camilofuentesp@gmail.com;
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Kathleen Rühland
(), Queen's University, ruhlandk@queensu.ca;
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Chris Grooms
(), Queen’s University, groomsc@queensu.ca;
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John Smol
(), Queen's University, smolj@queensu.ca;
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