Corrected western Atlantic sea-level curve for the last 11,000�years based on calibrated 14C dates from Acropora palmata framework and intertidal mangrove peat

Toscano, Marguerite A.; Macintyre, Ian G.

doi:10.1007/s00338-003-0315-4

Cited by 300 publications

(244 citation statements)

References 42 publications

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“…It is unlikely that these changes drove the successive decreases in size at maturity in S. pugilis observed here because (i) the modern day configuration of mangrove, seagrass and fringing reef were established at some time before 7.2 ka when the archipelago flooded as observed in the establishment of coral reefs at this time [24]. (ii) Sea-level rise had slowed substantially by the Mid-Holocene and sea level was less than 3 m lower than today [47] or possibly much less [48]. As such, differences in topography and thus habitat availability for S. pugilis would have been essentially the same as today, especially given that (iii) topography in the archipelago is widely variable (figure 1) so flooding would have both increased and decreased the availability of habitat for S. pugilis depending on location.…”

Section: (I) Natural Environmental Changementioning

confidence: 80%

Evidence of size-selective evolution in the fighting conch from prehistoric subsistence harvesting

O’Dea

Shaffer

Doughty³

et al. 2014

Proc. R. Soc. B.

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Intensive size-selective harvesting can drive evolution of sexual maturity at smaller body size. Conversely, prehistoric, low-intensity subsistence harvesting is not considered an effective agent of size-selective evolution. Uniting archaeological, palaeontological and contemporary material, we show that size at sexual maturity in the edible conch Strombus pugilis declined significantly from pre-human (approx. 7 ka) to prehistoric times (approx. 1 ka) and again to the present day. Size at maturity also fell from early-to late-prehistoric periods, synchronous with an increase in harvesting intensity as other resources became depleted. A consequence of declining size at maturity is that early prehistoric harvesters would have received two-thirds more meat per conch than contemporary harvesters. After exploring the potential effects of selection biases, demographic shifts, environmental change and habitat alteration, these observations collectively implicate prehistoric subsistence harvesting as an agent of size-selective evolution with long-term detrimental consequences. We observe that contemporary populations that are protected from harvesting are slightly larger at maturity, suggesting that halting or even reversing thousands of years of size-selective evolution may be possible.

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Section: (I) Natural Environmental Changementioning

confidence: 80%

Evidence of size-selective evolution in the fighting conch from prehistoric subsistence harvesting

O’Dea

Shaffer

Doughty³

et al. 2014

Proc. R. Soc. B.

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“…However, an increase in wetness is actually recorded Ϸ3 ka B.P. A recent regional western Atlantic RSL record shows a very gradual rise during the Holocene (42). A slowly declining gradient between the Florida aquifer and the coast during the late-Holocene would most likely be balanced by the rate of peat accumulation (Ϸ2 m since 5 ka B.P.…”

Section: Methodsmentioning

confidence: 99%

Mid- to late-Holocene El Niño-Southern Oscillation dynamics reflected in the subtropical terrestrial realm

Donders

Wagner²,

Dilcher³

et al. 2005

Proc. Natl. Acad. Sci. U.S.A.

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High resolution pollen analysis of mid-to late-Holocene peat deposits from southwest Florida reveals a stepwise increase in wetland vegetation that points to an increased precipitationdriven fresh water flow during the past 5,000 years. The tight coupling between winter precipitation patterns in Florida and the strength of the El Niñ o-Southern Oscillation (ENSO) strongly suggests that the paleo-hydrology record reflects changes in ENSO intensity. A terrestrial subtropical record outside the Indo Pacific Warm Pool both documents ecosystem response to the known onset of modern-day ENSO periodicities, between Ϸ7,000 and 5,000 years B.P., and subsequent ENSO intensification after 3,500 years B.P. The observed increases in ''wetness'' are sustained by a gradual rise in relative sea level that prevents a return to drier vegetation through natural succession.ENSO-teleconnections ͉ Florida ͉ paleoprecipitation ͉ pollen

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“…Core EP09-28 was taken in 4 m of water (relative to mean sea level, or MSL). We plotted the depths of dated samples in our cores against the Toscano-Macintyre sea-level curve for the Caribbean 45 ( Supplementary Fig. 2).…”

Section: Holocene Sea-level Changementioning

confidence: 99%

Climatic and biotic thresholds of coral-reef shutdown

et al. 2015

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Climate change is now the leading cause of coral-reef degradation and is altering the adaptive landscape of coral populations 1,2 . Increasing sea temperatures and declining carbonate saturation states are inhibiting short-term rates of coral calcification, carbonate precipitation and submarine cementation [3][4][5] . A critical challenge to coral-reef conservation is understanding the mechanisms by which environmental perturbations scale up to influence long-term rates of reef-framework construction and ecosystem function 6,7 . Here we reconstruct climatic and oceanographic variability using corals sampled from a 6,750-year core from Pacific Panamá. Simultaneous reconstructions of coral palaeophysiology and reef accretion allowed us to identify the climatic and biotic thresholds associated with a 2,500-year hiatus in vertical accretion beginning ∼4,100 years ago 8 . Stronger upwelling, cooler sea temperatures and greater precipitation-indicators of La Niña-like conditions-were closely associated with abrupt reef shutdown. The physiological condition of the corals deteriorated at the onset of the hiatus, corroborating theoretical predictions that the tipping points of radical ecosystem transitions should be manifested sublethally in the biotic constituents 9 . Future climate change could cause similar threshold behaviours, leading to another shutdown in reef development in the tropical eastern Pacific.Climatic and oceanographic variability have played a dominant role in the development of reefs throughout the Phanerozoic eon 10 , and the recent past is no exception. In Panamá and several other locations in the Pacific, coral reefs stopped accreting vertically for 2,500 years, beginning ∼4,100 cal yr BP (ref. 8; calibrated 14 C calendar years before 1950; Fig. 1a). Correlations with regional palaeoclimate proxies suggest that enhanced variability of the El Niño/Southern Oscillation (ENSO) was the ultimate cause of reef shutdown in the tropical eastern Pacific 8 (TEP). Climatic shifts at that time led to environmental and cultural impacts on a global scale 11,12 .In this study we investigated the long-term impacts of environmental variability on coral physiology and reef development in the TEP to ascertain the climatic, oceanographic and biotic controls on ecosystem state in the past. We quantified the range of environmental conditions that corals experienced during the past ∼6,750 years to determine whether significant changes in climate or oceanography were associated with changes in coral physiology or reef accretion. We then evaluated the environmental and physiological thresholds that characterized the catastrophic phase shift to the hiatus.In Pacific Panamá, El Niño-like periods are characterized by a warm, dry climate and a reduction in seasonal upwelling. Those conditions are reversed during La Niña-like periods (Supplementary Discussion and Supplementary Fig. 1). Contemporary environmental variability is high at Contadora Island, a site in Pacific Panamá that is exposed to intense seasonal upwelling and ...

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Corrected western Atlantic sea-level curve for the last 11,000�years based on calibrated 14C dates from Acropora palmata framework and intertidal mangrove peat

Cited by 300 publications

References 42 publications

Evidence of size-selective evolution in the fighting conch from prehistoric subsistence harvesting

Evidence of size-selective evolution in the fighting conch from prehistoric subsistence harvesting

Mid- to late-Holocene El Niño-Southern Oscillation dynamics reflected in the subtropical terrestrial realm

Climatic and biotic thresholds of coral-reef shutdown

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