Impact of Late Holocene climate variability and anthropogenic activities on Biscayne Bay (Florida, U.S.A.): Evidence from diatoms

Wachnicka, Anna; Gaiser, Evelyn E.; Wingard, Lynn; Briceño, Henry O.; Harlem, Peter

doi:10.1016/j.palaeo.2012.12.020

Cited by 12 publications

(9 citation statements)

References 61 publications

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“…Changes in sedimentary diatom assemblages in shallow marine environments in Florida have also been related with extreme climatic conditions associated with large-scale climatic oscillations like ENSO or the Pacific Decadal Oscillation (PDO) events (Wachnicka et al 2013). In these environments the changes in diatom assemblages have been mostly triggered by the cold phases of these events, and they have been irreversible.…”

Section: Historical Perspectivementioning

confidence: 99%

Responses to a warming trend and “El Niño” events in a tropical lake in western Mexico

et al. 2015

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Section: Historical Perspectivementioning

confidence: 99%

Responses to a warming trend and “El Niño” events in a tropical lake in western Mexico

et al. 2015

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“…Post 1950, diatom communities in most cores show a significant increase in abundance of epiphytic communities and in taxa with wider salinity tolerances (Wachnicka and Wingard, 2015). The frequency and magnitude of shifts in diatom species composition also increased post-1950s (Wachnicka et al, 2013c;Wachnicka and Wingard, 2015), which agrees with research that has indicated the rate of biological change usually increases with continuous changes to environmental conditions (Folke et al, 2004). The diatom analyses are consistent with paleoecologic analyses of other benthic organisms (mollusks, ostracodes, foraminifers) that detected significant shifts between the 1940s and 1960s in cores from south Florida's estuaries (Brewster-Wingard and Ishman, 1999;Alvarez Zarikian et al, 2001;BrewsterWingard et al, 2001;Cronin et al, 2001;Wingard et al, 2003Wingard et al, , 2004.…”

Section: Understanding Biotic Responses To Sea Level Climate and Anmentioning

confidence: 94%

“…Major shifts in the structure of ostracode and diatom assemblages often coincide with shifts in the intensity of ENSO, AMO, and the Pacific Decadal Oscillation (PDO). Wachnicka et al (2013c) showed that the occurrence of severe and prolonged droughts associated with a combination of extreme cold phases of ENSO, AMO, and PDO, or a combination of warm phases of AMO and cold phases of PDO, corresponded to significant changes in the structure of diatom assemblages in cores from Biscayne Bay (Figure 6). For example, the largest shifts in diatom assemblage structure in Card Sound Bank and No Name Bank cores in the late 1950s coincided with changes in precipitation from below average to above average.…”

Section: Understanding Biotic Responses To Sea Level Climate and Anmentioning

confidence: 99%

The Role of Paleoecology in Restoration and Resource Management—The Past As a Guide to Future Decision-Making: Review and Example from the Greater Everglades Ecosystem, U.S.A

2017

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Resource managers around the world are challenged to develop feasible plans for sustainable conservation and/or restoration of the lands, waters, and wildlife they administer-a challenge made greater by anticipated climate change and associated effects over the next century. Increasingly, paleoecologic and geologic archives are being used to extend the period of record of observed data and provide information on centennial to millennial scale responses to long-term drivers of ecosystem change. The development of paleoecology from an emerging field investigating past environments to a highly relevant applied science is reviewed and general examples of the application of paleoecologic research to resource management questions in diverse habitats and regions are provided. Specific examples of the application of paleoecologic research to the restoration of the Greater Everglades Ecosystem of south Florida (U.S.A) are presented. Conducting valuable scientific research that would benefit resource management decisions, however, is not enough. Scientists and resource managers need to be engaged in collaborative discussions from the beginning of the research process to ensure that management questions are being addressed and that the science reaches the people who will benefit from the information. Paleoecology and related disciplines provide an understanding of how ecosystems and individual species function and change over time in response to both natural and anthropogenic drivers. Information on pre-anthropogenic baseline conditions is provided by paleoecologic research, but it is the detection of long-term trends and cycles that allow resource managers to set realistic goals and targets by moving away from the fixed-point baseline concept to one of dynamic landscapes that anticipates and incorporates an expectation of change into decision-making.

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“…Evaporation in south Florida is high in the summer months, but total annual rainfall exceeds annual evaporation. In addition to discrete storm events, multi-decadal oscillations such as El Niño Southern Oscillation (ENSO), Atlantic Multidecadal Oscillation (AMO), and North Atlantic Oscillation (NAO), combined with millennial scale forcing like the mean position of the Intertropical Convergence Zone (ITCZ), have a significant role in shaping the south Florida climate (Bernhardt, 2011;Cronin et al, 2012;Wachnicka et al, 2013b). These climatic oscillations are a factor in periodic flooding and droughts in the Everglades ecosystem, and affect water level, flow and hydroperiod (DeAngelis and White, 1994).…”

Section: Regional Setting and Site Locationsmentioning

confidence: 99%

Estimating Late 19th Century Hydrology in the Greater Everglades Ecosystem: An Integration of Paleoecologic Data and Models

Marshall¹,

Bernhardt

Wingard

2020

Front. Environ. Sci.

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Determining hydrologic conditions prior to instrumental records is a challenge for restoration of freshwater ecosystems worldwide. Paleoecologic data provide this information on past conditions and when these data are used to adjust hydrologic models, allow conditions to be hindcast that may not be directly estimated from the paleo-data alone. In this context, the paleo-data provide real-world estimates as input to the models. Restoration of the Greater Everglades Ecosystem requires this understanding of the hydrology of the natural system prior to significant alterations due to water management and land use. Large scale models such as the Natural Systems Model (NSM 4.6.2) have been used by the South Florida Water Management District and other agencies responsible for restoration to estimate past hydrologic conditions; however, these models typically portray a drier natural system for the beginning of the 20th century than what is indicated by paleoecologic analyses and historical data. The purpose of this study is to estimate pre-20th century water levels, hydroperiods and flow in the freshwater wetlands of the Everglades by using pollen assemblage data in three sediment cores to adjust the Natural Systems Model. This study is designed to further test estimates of flow through the Everglades derived from analysis of sediment cores collected in Florida Bay. The results demonstrate that the NSM 4.6.2 underestimates water levels and hydroperiods in the Everglades compared to the paleoadjusted NSM 4.6.2 model outputs. Flow models that use the paleo-adjusted water levels as input indicate flow through Shark River Slough in the late 19th century was approximately two times flow between 1990 and 2000, and flow through Taylor Slough was approximately three times flow between 1990 and 2000. The flow estimates derived from this study agree with the estimates derived from earlier studies using estuarine cores. This integration of paleoecologic information and hydrologic models provides resource managers with the best available estimates of past conditions and allows them to set realistic targets for restoration of freshwater ecosystems.

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Impact of Late Holocene climate variability and anthropogenic activities on Biscayne Bay (Florida, U.S.A.): Evidence from diatoms

Cited by 12 publications

References 61 publications

Responses to a warming trend and “El Niño” events in a tropical lake in western Mexico

Responses to a warming trend and “El Niño” events in a tropical lake in western Mexico

The Role of Paleoecology in Restoration and Resource Management—The Past As a Guide to Future Decision-Making: Review and Example from the Greater Everglades Ecosystem, U.S.A

Estimating Late 19th Century Hydrology in the Greater Everglades Ecosystem: An Integration of Paleoecologic Data and Models

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