The Loop Current circulation over the MIS 9 to MIS 5 based on planktonic foraminifera assemblages from the Gulf of Mexico

Arellano‐Torres, Elsa; Amezcua‐Montiel, Abril

doi:10.1002/essoar.10512688.2

Cited by 4 publications

(7 citation statements)

References 121 publications

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“…The carbon isotope record shows a tendency to increase their values from MIS‐9 to MIS‐4. However, over the end of MIS‐9 to MIS‐8 (320–270), we find average values ∼0.7‰, but over MIS‐6 to MIS‐4 (178–70 ka), average values ∼1.0‰ (Figure 4) (Arellano‐Torres, Amezcua‐Montiel, & Casas‐Ortiz, 2023).…”

Section: Resultsmentioning

confidence: 77%

“…After washing the sample, we removed the mud fraction (<62 μm) from the sand size fraction (>62 μm). On average, the mud represents 68% of the bulk sample and the sand size 33%, which contains all the foraminifera tests (Arellano‐Torres, Amezcua‐Montiel, & Casas‐Ortiz, 2023).…”

Section: Resultsmentioning

confidence: 99%

“…The species N. dutertrei , T. sacculifer , and O. universa contribute 30.2% on average (Figures 2d–2f). The 15 minor species with relative abundance <1% only represent 3.3% (Arellano‐Torres, Amezcua‐Montiel, & Casas‐Ortiz, 2023).…”

Section: Resultsmentioning

confidence: 99%

“…The absolute and relative abundances of the planktonic foraminifera used for Q‐mode factor analysis, and the stable isotope data (δ 18 O‐PDB and δ 13 C‐PDB) (‰) of Globigerinoides ruber (white), used to reconstruct the water masses and surface circulation in this study, are available at Zenodo (Arellano‐Torres, Amezcua‐Montiel, & Casas‐Ortiz, 2023) with license, Creative Commons Attribution 4.0 International (CC BY 4.0).…”

Section: Data Availability Statementmentioning

confidence: 99%

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The Loop Current Circulation Over the MIS 9 to MIS 5 Based on Planktonic Foraminifera Assemblages From the Gulf of Mexico

Arellano‐Torres

Amezcua‐Montiel

Casas‐Ortiz

2023

Paleoceanog and Paleoclimatol

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The loop current (LC) in the Gulf of Mexico (GoM) is part of the western North Atlantic circulation. Recording its strength and slowdown variations can help us characterize the regional climate over the Late Pleistocene. To reconstruct the sea surface and the LC intensity in the eastern GoM, we study the distribution patterns of planktonic foraminifera in the core EN‐032‐18PC, spanning the end of Marine Isotope Stage (MIS) 9 to early MIS‐4. We reconstructed a sequence of paleoceanographic events based on stable isotopes (δ18O and δ13C) of the surface dweller Globigerinoides ruber and two faunal assemblages. The first assemblage explains most of the glacial and late interglacial periods, suggesting a subtropical environment with a deep thermocline and a reduced LC due to a moderate inflow of warm Caribbean waters. The second assemblage explains the warmest interglacial substages, dominated by tropical species, a shallow thermocline, and an extended LC, driven by summer insolation. Overall, surface ocean conditions led to more ecological successions and instability during the warmest interglacial substages than during glacial periods, as supported by the stable isotope records. Besides the GoM relationship to AMOC, as a regulator of heat transport to higher latitudes, we suggest that fluctuations in the LC rely on the migration of atmospheric circulation patterns and astronomical insolation forcing.

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Data Availability Statementmentioning

confidence: 99%

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The Loop Current Circulation Over the MIS 9 to MIS 5 Based on Planktonic Foraminifera Assemblages From the Gulf of Mexico

Arellano‐Torres

Amezcua‐Montiel

Casas‐Ortiz

2023

Paleoceanog and Paleoclimatol

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“…6). Also, the Loop Current is truncated during glacial periods, flowing more directly from the Yucatán Channel into the Straits of Florida (Arellano-Torres, Amezcua-Montiel, & Casas-Ortiz, 2023), which could complement sea-level falls in reducing travel distance.…”

Section: Synthetic Analysesmentioning

confidence: 99%

Biogeography of Greater Antillean freshwater fishes, with a review of competing hypotheses

Massip-Veloso,

Hoagstrom,

McMahan

et al. 2023

Preprint

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In biogeography, vicariance and long-distance dispersal are often characterized as competing scenarios. However, they are related concepts, both relying on reciprocal illumination from geological, ecological, and phylogenetic evidence. This can be illustrated for freshwater fishes, which may immigrate to islands when freshwater connections are temporarily present (vicariance), or by unusual means when oceanic gaps are crossed (long-distance dispersal). Marine barriers have a strong filtering effect, limiting immigrants to those most capable of oceanic dispersal. The roles of landspans and oceanic dispersal are being debated for freshwater fishes of the Greater Antilles. We review three active hypotheses (Cretaceous vicariance, GAARlandia, long-distance dispersal) and propose long-distance dispersal to be an appropriate null model due to a lack of reciprocal illumination for landspan hypotheses. Greater Antillean freshwater fishes have six potential source bioregions (defined from faunal similarity): Northern Gulf of México, Western Gulf of México, Maya Terrane, Chortís Block, Eastern Panamá, and Northern South America. Faunas of the Greater Antilles are composed of taxa immigrating from many of these bioregions, but there is strong compositional disharmony between island and mainland fish faunas (>90% of the species are cyprinodontiforms, compared to <10% in Northern Gulf of México and Northern South America, and ≤50% elsewhere), consistent with a hypothesis of long-distance dispersal. Ancestral area analysis indicates there were 16 or 17 immigration events over the last 51 my, 14 or 15 of these by cyprinodontiforms. Published divergence estimates and evidence available for each immigration event suggest they occurred at different times and by different pathways, possibly with rafts of vegetation discharged from rivers or washed to sea during storms. If so, ocean currents likely provide critical pathways for immigration when flowing from one landmass to another, but create dispersal barriers when flowing perpendicular between landmasses. In addition to high salinity tolerance, cyprinodontiforms (collectively) display a variety of adaptations that could enhance their ability to live with rafts (small body size, viviparity, low metabolism, amphibiousness, diapause, self-fertilization). These adaptations likely also helped immigrants establish island populations after arrival and persist long term thereafter. Cichlids may have used a pseudo bridge (Nicaragua Rise) to reach the Greater Antilles, persisting only on the largest islands (Cuba, Hispaniola). Gar (Lepisosteidae) may have crossed the Straits of Florida to Cuba, a relatively short crossing that is not a barrier to gene flow for several cyprinodontiform immigrants. Indeed, widespread distributions of Quaternary migrants (Cyprinodon,Gambusia,Kryptolebias), within the Greater Antilles and among neighbouring bioregions, imply long-distance dispersal is not necessarily inhibitory for well-adapted species, even though it appears to be virtually impossible all other freshwater fishes.

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Biogeography of Greater Antillean freshwater fishes, with a review of competing hypotheses

Massip‐Veloso,

Hoagstrom,

McMahan

et al. 2024

Biological Reviews

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In biogeography, vicariance and long‐distance dispersal are often characterised as competing scenarios. However, they are related concepts, both relying on collective geological, ecological, and phylogenetic evidence. This is illustrated by freshwater fishes, which may immigrate to islands either when freshwater connections are temporarily present and later severed (vicariance), or by unusual means when ocean gaps are crossed (long‐distance dispersal). Marine barriers have a strong filtering effect on freshwater fishes, limiting immigrants to those most capable of oceanic dispersal. The roles of vicariance and dispersal are debated for freshwater fishes of the Greater Antilles. We review three active hypotheses [Cretaceous vicariance, Greater Antilles–Aves Ridge (GAARlandia), long‐distance dispersal] and propose long‐distance dispersal to be an appropriate model due to limited support for freshwater fish use of landspans. Greater Antillean freshwater fishes have six potential source bioregions (defined from faunal similarity): Northern Gulf of México, Western Gulf of México, Maya Terrane, Chortís Block, Eastern Panamá, and Northern South America. Faunas of the Greater Antilles are composed of taxa immigrating from many of these bioregions, but there is strong compositional disharmony between island and mainland fish faunas (>90% of Antillean species are cyprinodontiforms, compared to <10% in Northern Gulf of México and Northern South America, and ≤50% elsewhere), consistent with a hypothesis of long‐distance dispersal. Ancestral‐area reconstruction analysis indicates there were 16 or 17 immigration events over the last 51 million years, 14 or 15 of these by cyprinodontiforms. Published divergence estimates and evidence available for each immigration event suggests they occurred at different times and by different pathways, possibly with rafts of vegetation discharged from rivers or washed to sea during storms. If so, ocean currents likely provide critical pathways for immigration when flowing from one landmass to another. On the other hand, currents create dispersal barriers when flowing perpendicularly between landmasses. In addition to high salinity tolerance, cyprinodontiforms collectively display a variety of adaptations that could enhance their ability to live with rafts (small body size, viviparity, low metabolism, amphibiousness, diapause, self‐fertilisation). These adaptations likely also helped immigrants establish island populations after arrival and to persist long term thereafter. Cichlids may have used a pseudo bridge (Nicaragua Rise) to reach the Greater Antilles. Gars (Lepisosteidae) may have crossed the Straits of Florida to Cuba, a relatively short crossing that is not a barrier to gene flow for several cyprinodontiform immigrants. Indeed, widespread distributions of Quaternary migrants (Cyprinodon, Gambusia, Kryptolebias), within the Greater Antilles and among neighbouring bioregions, imply that long‐distance dispersal is not necessarily inhibitory for well‐adapted species, even though it appears to be virtually impossible for all other freshwater fishes.

show abstract

The Loop Current circulation over the MIS 9 to MIS 5 based on planktonic foraminifera assemblages from the Gulf of Mexico

Cited by 4 publications

References 121 publications

The Loop Current Circulation Over the MIS 9 to MIS 5 Based on Planktonic Foraminifera Assemblages From the Gulf of Mexico

The Loop Current Circulation Over the MIS 9 to MIS 5 Based on Planktonic Foraminifera Assemblages From the Gulf of Mexico

Biogeography of Greater Antillean freshwater fishes, with a review of competing hypotheses

Biogeography of Greater Antillean freshwater fishes, with a review of competing hypotheses

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