Central American paleogeography controlled Pliocene Arctic Ocean molluscan migrations

Marincovich, Louie

doi:10.1130/0091-7613(2000)28<551:capcpa>2.0.co;2

Cited by 83 publications

(18 citation statements)

References 21 publications

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“…The prevalence of an estuarine circulation in the Arctic Ocean 42,43 , together with a high continental mean annual temperature (MAT) would have restricted the occurrence of sea ice in the Arctic interior. As such, the marginal seas (including the study location here) would have been ice-free or covered by first-year winter sea ice only ( late Miocene-early Pliocene, including mountainous uplift 44 and open/closing gateways (AAG, Bering Strait, Central American Seaways (CAS)) 21,45,46 , triggered the expansion of the Arctic sea ice coverage, reaching the modern summer limit (Fig. 1) for the first time at ca.…”

Section: Discussionmentioning

confidence: 99%

The emergence of modern sea ice cover in the Arctic Ocean

et al. 2014

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Section: Discussionmentioning

confidence: 99%

The emergence of modern sea ice cover in the Arctic Ocean

et al. 2014

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“…The opening of the Bering Strait and ages of mixing of the Atlantic and Pacific molluscan faunas, has also been re-evaluated (Marincovich, 2000;Marincovich and Gladenkov, 2001;Gladenkov et al, 2002). Marincovich (2000) suggested that there were multiple mixing events, with one following the first opening of the Bering Strait (4.8-5.5 Ma), and a second mixing event due to the change of direction of flow through the strait, arguably due to shoaling of the Central American Seaway (∼3.6 Ma; Although see Ramírez et al, 2016).…”

Section: Dating Constraints and Uncertaintiesmentioning

confidence: 99%

“…Marincovich (2000) suggested that there were multiple mixing events, with one following the first opening of the Bering Strait (4.8-5.5 Ma), and a second mixing event due to the change of direction of flow through the strait, arguably due to shoaling of the Central American Seaway (∼3.6 Ma; Although see Ramírez et al, 2016). These two periods also coincide with eustatic episodes (Marincovich, 2000). The thickness of the marine beds (<100 m) was considered to suggest a short period of deposition (Fyles et al, 1991), and this may be a "better fit" for the shorter high stand at ∼3.6 Ma.…”

Section: Dating Constraints and Uncertaintiesmentioning

confidence: 99%

Floral Dissimilarity and the Influence of Climate in the Pliocene High Arctic: Biotic and Abiotic Influences on Five Sites on the Canadian Arctic Archipelago

et al. 2017

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A recurring goal in ecological and paleoclimatic studies is to either forecast how ecosystems will respond to future climate or hindcast climate from past ecosystem assemblages. The Pliocene is a useful deep-time laboratory for understanding an equilibrium climate state under modern atmospheric CO 2 , and has been a focus for climate modelers. Accurate estimates of proxy data-model mismatch are hindered by the scarcity of well-constrained observations from well-dated sites in the High Arctic. Using a recently developed community-based approach (Climate Reconstruction Analysis using Coexistence Likelihood Estimation: CRACLE) compared with an established method (The Coexistence Approach: CA), and applied to extraordinary, permafrost-driven preservation of floras, we explore the climate and community assemblages at five Pliocene sites in the Canadian Arctic Archipelago. The results suggest that climatic differences at this scale do not simply correlate to differences in community assemblage between sites. The threshold temperature for tree line is one important component, but other factors in the environment (e.g., soil characteristics) may drive dissimilarity of communities where the taxa could share the same climate space. Estimates from CRACLE agree with previous estimates where available, and generally fall within the ranges of CA. Mean annual temperatures were ∼22 • C hotter (ranging from 0.8 to 6.2 • C by species across sites) and mean annual precipitation ∼500 mm wetter (ranging from 530 to 860 mm by species across sites) during the Early to "mid"-Pliocene (∼3.6 Ma) when compared with modern climate station data in the Canadian Arctic Archipelago. Comparison of estimates for three levels of taxonomic input suggest judicious interpretation is needed when generic level identifications are used, especially in the Polar Regions. The results herein are a reminder of the large impact of non-climatic abiotic and biotic factors to be accounted for when predicting future ranges of communities under different climate conditions from the present, and when hindcasting climate from past ecosystem assemblages.

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“…Panama during the middle Miocene has been interpreted as an archipelago until 2.74-3.15 Ma (Coates and Obando, 1996;Coates et al, 2004;Bartoli et al, 2005), when a land bridge allowed plant and mammal interchange between North and South America (Webb and Rancy, 1996) and separated Caribbean and Pacific marine organisms (Marincovich, 2000).…”

Section: Introductionmentioning

confidence: 99%

Middle Miocene Global Change and Paleogeography of Panama

Retallack¹,

Kirby²

2007

PALAIOS

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Fossil leaves in the middle Miocene Cucaracha Formation along the Panama Canal are 10-15 cm long, thick, and entire-margined; fossil pollen is also dicot dominated, as expected for wet tropical forests. Fossil woods include palms and ring-porous dicots, with smooth bark as is found in weakly seasonal tropical climates. In contrast, late Hemingfordian to early Barstovian mammals of the Cucaracha Formation are the same as those found in Nebraska, Kansas, and Florida, where climate was drier and cooler and vegetation more open. Cucaracha paleosols reconcile these differences as evidence of a mosaic of swamps to mangal (mangrove forests) preserving plants and dry uplands preserving mammals. A dozen pedotypes represent as many vegetation types, including mangrove, fresh-water and marineinfluenced swamp, early successional riparian woodland, colonizing forest, dry tropical forest, and woodland. Many paleosols have calcareous nodules, and some have pedogenic barite nodules. Depth to carbonate and paleosol thickness with carbonate indicate mean annual precipitation of 573-916 ± 147 mm and mean annual range of precipitation of 27-65 ± 22 mm. Chemical analyses of paleosol Bt horizons confirm mean annual precipitation of 296-1142 mm and mean annual temperature of 15-16 ± 4.4°C. Low precipitation and temperature estimates imply a rain shadow from a high (1400-4000 m) volcanic mountain range to the west, with continuous land connection to allow immigration of mammals from North America. Partial enclosure of the Caribbean Sea by a mountainous Panama peninsula, as well as by Antillean arcs, initiated high Caribbean marine temperature and salinity well before Pliocene isthmian closure.

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Central American paleogeography controlled Pliocene Arctic Ocean molluscan migrations

Cited by 83 publications

References 21 publications

The emergence of modern sea ice cover in the Arctic Ocean

The emergence of modern sea ice cover in the Arctic Ocean

Floral Dissimilarity and the Influence of Climate in the Pliocene High Arctic: Biotic and Abiotic Influences on Five Sites on the Canadian Arctic Archipelago

Middle Miocene Global Change and Paleogeography of Panama

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