@article {2754,
	title = {Organic matter sources and lateral sedimentation in a Bahamian karst basin (sinkhole) over the late Holocene: Influence of local vegetation and climate},
	journal = {Palaeogeography, Palaeoclimatology, Palaeoecology},
	volume = {506},
	year = {2018},
	month = {Jan-10-2018},
	pages = {70 - 83},
	abstract = {Karst basins (e.g., blueholes, sinkholes) accumulate well-preserved sedimentary successions that provide transformative paleoclimatic and paleoenvironmental information. However, the sedimentary processes within these basins are not yet fully understood. Here we present stable carbon isotopic values (δ13Corg) and C:N ratios of bulk organic matter in well-dated sediment cores from Blackwood Sinkhole (Abaco, The Bahamas) to investigate the changing flux of organic matter into the sinkhole during the late Holocene. The provenance of preserved organic matter changed through the late Holocene between three primary sources, as determined by three-endmember mixing modeling: wetland organic matter from the adjacent epikarst surface, authigenic primary productivity in the oligohaline meteoric lens, and terrestrial organic matter from the surrounding landscape. Expansion of wetlands on the adjacent epikarst surface played a critical role by increasing the flux of wetland organic matter to the sinkhole, especially during the last 1000 years. Hurricanes and regional rainfall may have mediated organic matter delivery to the benthos, either through hampering wetland development (prior to 1000 cal yr BP) or by changing dissolved nutrient concentrations available in the basin for primary producers. These results demonstrate that organic matter provenance in karst basins is not constant through time, and is significantly dependent upon both landscape vegetation on the epikarst surface and changing hydrographic conditions that impacts nutrient availability to primary producers.},
	keywords = {Caribbean, Karst, Mixing model, Stable isotopes, Subtropical landscape},
	issn = {00310182},
	doi = {10.1016/j.palaeo.2018.06.014},
	url = {https://linkinghub.elsevier.com/retrieve/pii/S0031018218300683},
	author = {Tamalavage, Anne E. and van Hengstum, Peter J. and Louchouarn, Patrick and Molodtsov, Sergey and Kaiser, Karl and Donnelly, Jeffrey P. and Albury, Nancy A. and Fall, Patricia L.}
}
@article {2492,
	title = {Detrital cave sediments record Late Quaternary hydrologic and climatic variability in northwestern Florida, USA},
	journal = {Sedimentary Geology},
	volume = {335},
	year = {2016},
	month = {Jan-04-2016},
	pages = {51 - 65},
	abstract = {Detrital sediment in Florida{\textquoteright}s (USA) submerged cave systems may preserve records of regional climate and hydrologic variability. However, the basic sedimentology, mineralogy, stratigraphic variability, and emplacement history of the successions in Florida{\textquoteright}s submerged caves remains poorly understood. Here we present stratigraphic, mineralogical, and elemental data on sediment cores from two phreatic cave systems in northwestern Florida (USA), on the Dougherty Karst Plain: Hole in the Wall Cave (HITW) and Twin Cave. Water flowing through these caves is subsurface flow in the Apalachicola River drainage basin, and the caves are located just downstream from Jackson Blue (1st magnitude spring, > 2.8 m3 s- 1 discharge). Sedimentation in these caves is dominated by three primary sedimentary styles: (i) ferromanganese deposits dominate the basal recovered stratigraphy, which pass upsection into (ii) poorly sorted carbonate sediment, and finally into (iii) fine-grained organic matter (gyttja) deposits. Resolving the emplacement history of the lower stratigraphic units was hampered by a lack of suitable material for radiocarbon dating, but the upper organic-rich deposits have a punctuated depositional history beginning in the earliest Holocene. For example, gyttja primarily accumulated in HITW and Twin Caves from ~ 5500 to 3500 cal yr. BP, which coincides with regional evidence for water-table rise of the Upper Floridian Aquifer associated with relative sea-level rise in the Gulf of Mexico, and evidence for invigorated drainage through the Apalachicola River drainage basin. Gyttja sediments were also deposited in one of the caves during the B{\o}lling/Aller{\o}d climate oscillation. Biologically, these results indicate that some Floridian aquatic cave (stygobitic) ecosystems presently receive minimal organic matter supply in comparison to prehistoric intervals. The pre-Holocene poorly sorted carbonate sediment contains abundant invertebrate fossils, and likely documents a period of enhanced limestone dissolution and cave formation (speleogenesis) during lower paleo water levels. Further work is still required to (a) determine whether precipitation of the ferromanganese deposits is inorganically or biologically mediated, (b) temporally constrain the emplacement history of the primary sedimentary styles, and (c) determine the full geographic extent of these sedimentary signals. However, these preliminary observations suggest that sedimentation in the inland underwater caves of northwestern Florida is related to Quaternary-scale hydrographic variability in the Apalachicola River drainage basin in response to broader ocean and atmospheric forcing.},
	keywords = {Apalachicola, florida, Karst, Phreatic, Underwater cave},
	issn = {00370738},
	doi = {10.1016/j.sedgeo.2016.01.022},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S0037073816000312http://api.elsevier.com/content/article/PII:S0037073816000312?httpAccept=text/xmlhttp://api.elsevier.com/content/article/PII:S0037073816000312?httpAccept=text/plain},
	author = {Winkler, Tyler S. and van Hengstum, Peter J. and Horgan, Meghan C. and Donnelly, Jeffrey P. and Reibenspies, Joseph H.}
}
