The Role of Ocean Currents in the Temperature Selection of Plankton: Insights from an Individual-Based Model

Hellweger, Ferdi L.; Sebille, Erik van; Calfee, Benjamin C; Chandler, Jeremy W.; Zinser, Erik R.; Swan, Brandon K.; Fredrick, Neil D.

doi:10.1371/journal.pone.0167010

Cited by 17 publications

(27 citation statements)

References 54 publications

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“…Bijl et al, 2011). In the modern ocean, phytoplankton distribution patterns are driven by the interplay of passive transport by surface currents and temperature selection (Hellweger et al, 2016;Thomas et al, 2012). A similar dual selection mechanism seems to have affected the middle Eocene dinocyst assemblages in the region.…”

Section: Drivers Of Dinocyst Assemblage Change In the Tasman Gatewaymentioning

confidence: 98%

“…in Mediterranean sapropels (e.g., Sangiorgi et al, 2006;van Helmond et al, 2015;Zwiep et al, 2018), Cretaceous Oceanic Anoxic Event 2 shelf sediments (van Helmond et al, 2014) and the Holocene Adélie drift underlying a highly productive polynya system (Hartman et al, 2018). The average dinocyst concentrations at Site 1170 may be converted to average accumulation rates in the order of 10,000-80,000 cysts per cm 2 per yr.…”

Section: Massive Middle Eocene Dinocyst Productivity On the South Tasmentioning

confidence: 99%

“…The relatively low diversity of the dinocyst assemblages in combination with the high dominance of a single taxon (Enneadocysta dictyostila in the MECO interval) suggests a generally eutrophic setting that could have been characterised by seasonal plankton blooms. Notably, in several records from the Paleocene-Eocene Thermal Maximum (Harding et al, 2011;Sluijs et al, 2011;Frieling et al, 2018b), and a record from Oceanic Anoxic Event 2 at Bass River (van Helmond et al, 2014), highest concentrations of dinocysts reach into the 10,000-100,000 cysts per gram sediment, and also correspond to low diversity -high dominance assemblages, suggestive of dinoflagellate blooms. Dinocysts deriving from heterotrophic dinoflagellates are present at Site 1170, but not in high abundance (Supplementary data).…”

Section: Massive Middle Eocene Dinocyst Productivity On the South Tasmentioning

confidence: 99%

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Surface-circulation change in the Southern Ocean across the Middle Eocene Climatic Optimum: inferences from dinoflagellate cysts and biomarker paleothermometry

Cramwinckel¹,

Woelders²,

Huurdeman³

et al. 2019

Preprint

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Abstract. Global climate cooled from the early Eocene hothouse (~ 52–50 Ma) to the latest Eocene (~ 34 Ma). At the same time, the tectonic evolution of the Southern Ocean was characterized by the opening and deepening of circum-Antarctic gateways, which affected both surface- and deep-ocean circulation. The Tasman Gateway played a key role in regulating ocean throughflow between Australia and Antarctica. Southern Ocean surface currents through and around the Tasman Gateway have left recognizable tracers in the spatiotemporal distribution of plankton fossils, including organic-walled dinoflagellate cysts. This spatiotemporal distribution depends on physico-chemical properties of the water masses in which these organisms thrived. The degree to which the geographic path of surface currents (primarily controlled by tectonism) or their physico-chemical properties (significantly impacted by climate) have controlled the composition of the fossil assemblages has, however, remained unclear. In fact, it is yet poorly understood to what extent oceanographic response as a whole was dictated by climate change, independent of tectonics-induced oceanographic changes that operate on longer time scales. To disentangle the effects of tectonism and climate in the southwest Pacific Ocean, we target a climatic deviation from the long-term Eocene cooling trend, a 500 thousand year long global warming phase termed the Middle Eocene Climatic Optimum (MECO; ~ 40 Ma). The MECO warming is unrelated to regional tectonism, and thus provides a test case to investigate the oceans physiochemical response to climate change only. We reconstruct changes in surface-water circulation and temperature in and around the Tasman Gateway during the MECO through new palynological and organic geochemical records from the central Tasman Gateway (Ocean Drilling Program Site 1170), the Otway Basin (southeastern Australia) and the Hampden Section (New Zealand). Our results confirm that dinocyst communities track tectonically driven circulation patterns, yet the variability within these communities can be driven by superimposed temperature change. Together with published results from the east of the Tasman Gateway, our results suggest that as surface-ocean temperatures rose, the East Australian Current extended further southward during the peak of MECO warmth. Simultaneous with high sea-surface temperatures in the Tasman Gateway area, pollen assemblages indicate warm temperate rainforests with paratropical elements along the southeastern margin of Australia. Finally, based on new age constraints we suggest that a regional southeast Australian transgression might have been caused by sea-level rise during MECO.

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Section: Drivers Of Dinocyst Assemblage Change In the Tasman Gatewaymentioning

confidence: 98%

Section: Massive Middle Eocene Dinocyst Productivity On the South Tasmentioning

confidence: 99%

Section: Massive Middle Eocene Dinocyst Productivity On the South Tasmentioning

confidence: 99%

See 1 more Smart Citation

Surface-circulation change in the Southern Ocean across the Middle Eocene Climatic Optimum: inferences from dinoflagellate cysts and biomarker paleothermometry

Cramwinckel¹,

Woelders²,

Huurdeman³

et al. 2019

Preprint

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“…There are many studies of distribution of marine microbes e.g. [1][2][3][4], but these typically survey patterns of macro-scale diversity. Differences in species level or genus level composition between locations are as likely to reflect environmental heterogeneity as dispersal, making the patterns difficult to interpret.…”

Section: Introductionmentioning

confidence: 99%

Recent mixing of Vibrio parahaemolyticus populations

Yang

Pei

et al. 2019

The ISME Journal

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Humans have profoundly affected the ocean environment but little is known about anthropogenic effects on the distribution of microbes. Vibrio parahaemolyticus is found in warm coastal waters and causes gastroenteritis in humans and economically significant disease in shrimps. Based on data from 1103 genomes of environmental and clinical isolates, we show that V. parahaemolyticus is divided into four diverse populations, VppUS1, VppUS2, VppX and VppAsia. The first two are largely restricted to the US and Northern Europe, while the others are found worldwide, with VppAsia making up the great majority of isolates in the seas around Asia. Patterns of diversity within and between the populations are consistent with them having arisen by progressive divergence via genetic drift during geographical isolation. However, we find that there is substantial overlap in their current distribution. These observations can be reconciled without requiring genetic barriers to exchange between populations if long-range dispersal has increased dramatically in the recent past. We found that VppAsia isolates from the US have an average of 1.01% more shared ancestry with VppUS1 and VppUS2 isolates than VppAsia isolates from Asia itself. Based on time calibrated trees of divergence within epidemic lineages, we estimate that recombination affects about 0.017% of the genome per year, implying that the genetic mixture has taken place within the last few decades. These results suggest that human activity, such as shipping, aquatic products trade and increased human migration between continents, are responsible for the change of distribution pattern of this species.

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“…There are many studies of distribution of marine microbes e.g. [1-4], but these typically survey patterns of macro-scale diversity. Differences in species level or genus level composition between locations are as likely to reflect environmental heterogeneity as dispersal, making the patterns difficult to interpret.…”

Section: Introductionmentioning

confidence: 99%

Recent mixing of Vibrio parahaemolyticus populations

Yang

Pei

et al. 2018

Preprint

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20Background Humans have profoundly affected the ocean environment but little is known 21 about anthropogenic effects on the distribution of microbes. Vibrio parahaemolyticus is found 22 in warm coastal waters and causes gastroenteritis in humans and economically significant 23 disease in shrimps. 24Results Based on data from 1,103 genomes, we show that V. parahaemolyticus is divided 25 into four diverse populations, VppUS1, VppUS2, VppX and VppAsia. The first two are 26 largely restricted to the US and Northern Europe, while the others are found worldwide, with 27 VppAsia making up the great majority of isolates in the seas around Asia. Patterns of 28 diversity within and between the populations are consistent with them having arisen by 29 progressive divergence via genetic drift during geographical isolation. However, we find that 30 there is substantial overlap in their current distribution. These observations can be reconciled 31 without requiring genetic barriers to exchange between populations if dispersal between 32 oceans has increased dramatically in the recent past. We found that VppAsia isolates from the 33 US have an average of 1.01% more shared ancestry with VppUS1 and VppUS2 isolates than 34 VppAsia isolates from Asia itself. Based on time calibrated trees of divergence within 35 epidemic lineages, we estimate that recombination affects about 0.017% of the genome per 36year, implying that the genetic mixture has taken place within the last few decades. 37Conclusions These results suggest that human activity, such as shipping and aquatic products 38 trade, are responsible for the change of distribution pattern of this marine species. 39 40 Keywords 41 Vibrio parahaemolyticus, population structure, biogeography, anthropogenic change, ocean 42 dispersal 43 44 3 45 Background 46 Hospitable environments for particular marine microbes can be separated by large distances 47 but whether dispersal barriers substantially influence their distribution and evolution is 48 unknown. There are many studies of distribution of marine microbes e.g. [1-4], but these 49 typically survey patterns of macro-scale diversity. Differences in species level or genus level 50 composition between locations are as likely to reflect environmental heterogeneity as 51 dispersal, making the patterns difficult to interpret. Recent spread of microbes between 52 continents has been documented for lineages that cause pathogenic infection of humans, 53 including notorious clonal groups within Vibrio parahaemolyticus and Vibrio cholerae [5-8]. 54 However, these lineages are unusual in using humans as vectors, which might facilitate long-55 range dispersal as in the case of the Haitian cholera outbreak [9]. We currently have little 56 information on rates of spread of the great majority of environmental organisms that do not 57 colonize large-animal hosts. 58 59 V. parahaemolyticus prefers warm coastal waters and causes gastroenteritis in humans [10, 60 11]. Disease outbreaks became common from 1990s and became global, due to spread of 61 pa...

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The Role of Ocean Currents in the Temperature Selection of Plankton: Insights from an Individual-Based Model

Cited by 17 publications

References 54 publications

Surface-circulation change in the Southern Ocean across the Middle Eocene Climatic Optimum: inferences from dinoflagellate cysts and biomarker paleothermometry

Surface-circulation change in the Southern Ocean across the Middle Eocene Climatic Optimum: inferences from dinoflagellate cysts and biomarker paleothermometry

Recent mixing of Vibrio parahaemolyticus populations

Recent mixing of Vibrio parahaemolyticus populations

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