Global impact of the Panamanian seaway closure

Schmittner, Andreas; Sarnthein, N.; Kinkel, Hanno; Bartoli, Gretta; Bickert, Torsten; Crucifix, Michel; Crudeli, D.; Groeneveld, Jeroen; Kösters, Frank; Mikolajewicz, Uwe; Millo, Christian; Reumer, J.; Schäfer, Priska; Schmidt, Daniela N; Schneider, Birgit; Schulz, Maximilian; Steph, Silke; Tiedemann, Ralf; Weinelt, Mara; Zuvela, M.

doi:10.1029/2004eo490010

Cited by 20 publications

(3 citation statements)

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“…However, with the Central American Seaway open, AMOC overturning is weakened bỹ 33% relative to the case of Drake Passage open but Central American Seaway closed (Fig. 2b), due to a steric-height-driven 17 Sv influx of fresher Pacific water into the Atlantic through the Central American Seaway, in agreement with previous studies (Keigwin, 1982;Schmittner et al, 2004;Schneider and Schmittner, 2006;Yang et al, 2014). In the southern hemisphere, for all CO 2 concentrations, the AABW circulation cell is stronger and larger when the Drake Passage is closed, in agreement with previous studies (Mikolajewicz et al, 1993) (Fig.…”

Section: Drake Passage Openingsupporting

confidence: 90%

Drake Passage and Central American Seaway controls on the distribution of the oceanic carbon reservoir

Fyke

d’Orgeville

Weaver

2015

Global and Planetary Change

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Section: Drake Passage Openingsupporting

confidence: 90%

Drake Passage and Central American Seaway controls on the distribution of the oceanic carbon reservoir

Fyke

d’Orgeville

Weaver

2015

Global and Planetary Change

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“…Applying a common crustacean mtCOI mutation rate of 1.4% per million years (Knowlton and Weigt, 1998), PLAB1 and PLAB2 share a common ancestor dating back to the Miocene (11.6-16.0 million years ago) or before. A global-scale cooling event began in the middle Miocene (Zachos et al, 2001), and both the ocean environment and geography have changed towards the present, including the formation of the Isthmus of Panama (Schmittner et al, 2004) and increased primary productivity in equatorial regions (Barron, 1985;Rea et al, 1991).…”

Section: Mechanisms Determining the Biogeography Of Mtcoi Cladesmentioning

confidence: 99%

Extensive genetic diversity and endemism across the global range of the oceanic copepod Pleuromamma abdominalis

Hirai

Tsuda

Goetze

2015

Progress in Oceanography

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Many oceanic zooplankton species have been described as cosmopolitan in distribution; however, recent molecular work has detected species complexity with highly divergent genetic lineages within several of these taxa. To further resolve the species complexity within these ecologically-important and widespread species, we performed both molecular and morphological analyses of the oceanic copepod Pleuromamma abdominalis using a comprehensive collection of material from 944 individuals collected at 46 sites across the global ocean. Phylogenetic analyses of mitochondrial cytochrome oxidase subunit I (mtCOI) sequences detected eighteen divergent evolutionary lineages within P. abdominalis, with an additional four singleton specimens that were also genetically divergent. Two phylogenetically distinct groups, PLAB1 and PLAB2, were supported by concordant sequence variation in the nuclear large subunit ribosomal RNA gene (nLSU). Within PLAB1, two mtCOI clades, 1a-1 and 1b-1 were observed, and each clade contained geographically distinct sub-clades 1a-2 and 1b-2. PLAB2 was composed of sixteen well-supported mtCOI clades (2a-2p) as well as four singletons. High genetic divergence among the mtCOI lineages within both PLAB1 and PLAB2, ranging between 9.2-11.2% and 4.3-18.9% K2P distances respectively, suggests the presence of additional species within these groups. Significant differences were observed in the presence and shape of antennule spines of adult females between sympatric clades with genetic distances greater than 5.7-7.0% (K2P). The biogeographic distributions of mtCOI clades indicated greater specialization to particular oceanographic provinces than observed in the nominal species P. abdominalis, with mtCOI clades ranging from antitropical in subtropical waters of all three ocean basins (Atlantic, Pacific and Indian; clade 1b-1 and 2a) to taxa that are endemic to a particular ocean region, for example restricted to equatorial waters of the Atlantic Ocean (clade 1b-2 and 2b). We hypothesize that many of these mtCOI clades are likely distinct, and currently undescribed species. The well-known high dominance of P. abdominalis across a range of pelagic habitats may occur as a spatial composite of genetically-distinct species with more restricted distributions and greater 3 ecological specialization to particular marine habitats than was previously recognized.

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“…The low genetic divergence of M. geyeri and M. bracteosa, could be an example of vicariance related to the Panamanian seaway closure (Schmittner et al 2004). Species are genetically close and share similar niches in geographically separated areas (Faure et al 2015;Hiller & Lessios 2019).…”

Section: Tablementioning

confidence: 99%

Munidopsis geyeri and M. exuta (Crustacea: Munidopsidae): A study of two deep-sea, amphi-Atlantic species that co-occur in the southern Gulf of Mexico

Gaytán-Caballero

Escobar²,

Robles³

et al. 2022

Zootaxa

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The history of colonization and dispersal of fauna among deep-sea chemosynthetic ecosystems remains enigmatic and poorly understood. The distribution of squat lobsters of the genus Munidopsis Whiteaves, 1874 can be influenced by the rich organic matter and associated organism communities of chemosynthetic ecosystems. The present work analyzed the molecular relationships and morphology of individuals from different populations of Munidopsis exuta Macpherson & Segonzac, 2005 and M. geyeri Pequegnat & Pequegnat, 1970 in such ecosystems along the Atlantic Equatorial Belt, including the Chapopote Knoll, in the southern Gulf of Mexico. Munidopsis geyeri is re-described based on the present findings and reference to the literature. This analysis documented the genetic distances, as well as range of variation in the diagnostic characters that support the separation of M. exuta and M. geyeri. Our results confirm that the two species coexist in seep ecosystems and have an amphi-Atlantic distribution.

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Global impact of the Panamanian seaway closure

Cited by 20 publications

References 0 publications

Drake Passage and Central American Seaway controls on the distribution of the oceanic carbon reservoir

Drake Passage and Central American Seaway controls on the distribution of the oceanic carbon reservoir

Extensive genetic diversity and endemism across the global range of the oceanic copepod Pleuromamma abdominalis

Munidopsis geyeri and M. exuta (Crustacea: Munidopsidae): A study of two deep-sea, amphi-Atlantic species that co-occur in the southern Gulf of Mexico

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