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Protoconch enlargement in Western Atlantic turritelline gastropod species following the closure of the Central American Seaway

The closure of the late Neogene interoceanic seaways between the Western Atlantic (WA) and Tropical Eastern Pacific (TEP)—commonly referred to as the Central American Seaway—significantly decreased nutrient supply in the WA compared to the TEP. In marine invertebrates, an increase in parental invest...

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Autores principales: Sang, Stephanie, Friend, Dana Suzanne, Allmon, Warren Douglas, Anderson, Brendan Matthew
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6509377/
https://www.ncbi.nlm.nih.gov/pubmed/31110681
http://dx.doi.org/10.1002/ece3.5120
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author Sang, Stephanie
Friend, Dana Suzanne
Allmon, Warren Douglas
Anderson, Brendan Matthew
author_facet Sang, Stephanie
Friend, Dana Suzanne
Allmon, Warren Douglas
Anderson, Brendan Matthew
author_sort Sang, Stephanie
collection PubMed
description The closure of the late Neogene interoceanic seaways between the Western Atlantic (WA) and Tropical Eastern Pacific (TEP)—commonly referred to as the Central American Seaway—significantly decreased nutrient supply in the WA compared to the TEP. In marine invertebrates, an increase in parental investment is expected to be selectively favored in nutrient‐poor marine environments as prolonged feeding in the plankton becomes less reliable. Here, we examine turritelline gastropods, which were abundant and diverse across this region during the Neogene and serve as important paleoenvironmental proxies, and test whether species exhibit decreased planktotrophy in the WA postclosure as compared to preclosure fossils and extant TEP species. We also test for differences in degree of planktotrophy in extant sister species pairs. Degree of planktotrophy was inferred by measuring the size of protoconchs, the species' larval shell that represents egg size. Protoconch size was compared between extant postclosure WA and TEP species and preclosure fossil species. To compare extant sister species, we reconstructed the phylogeny of available WA and TEP species using one nuclear (H3) and three mitochondrial markers (12S, 16S, and COI). Compared to the preclosure fossils, protoconch size increased in WA species but remained the same in the TEP species. In the two extant sister species pairs recovered in the phylogenetic analysis, the WA species are inferred to be nonplanktotrophic while the TEP species are planktotrophic. This suggests that decreased nutrient availability and primary productivity in the WA may have driven this change in developmental mode, and was the primary selective force resulting in postclosure turritelline extinctions.
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spelling pubmed-65093772019-05-20 Protoconch enlargement in Western Atlantic turritelline gastropod species following the closure of the Central American Seaway Sang, Stephanie Friend, Dana Suzanne Allmon, Warren Douglas Anderson, Brendan Matthew Ecol Evol Original Research The closure of the late Neogene interoceanic seaways between the Western Atlantic (WA) and Tropical Eastern Pacific (TEP)—commonly referred to as the Central American Seaway—significantly decreased nutrient supply in the WA compared to the TEP. In marine invertebrates, an increase in parental investment is expected to be selectively favored in nutrient‐poor marine environments as prolonged feeding in the plankton becomes less reliable. Here, we examine turritelline gastropods, which were abundant and diverse across this region during the Neogene and serve as important paleoenvironmental proxies, and test whether species exhibit decreased planktotrophy in the WA postclosure as compared to preclosure fossils and extant TEP species. We also test for differences in degree of planktotrophy in extant sister species pairs. Degree of planktotrophy was inferred by measuring the size of protoconchs, the species' larval shell that represents egg size. Protoconch size was compared between extant postclosure WA and TEP species and preclosure fossil species. To compare extant sister species, we reconstructed the phylogeny of available WA and TEP species using one nuclear (H3) and three mitochondrial markers (12S, 16S, and COI). Compared to the preclosure fossils, protoconch size increased in WA species but remained the same in the TEP species. In the two extant sister species pairs recovered in the phylogenetic analysis, the WA species are inferred to be nonplanktotrophic while the TEP species are planktotrophic. This suggests that decreased nutrient availability and primary productivity in the WA may have driven this change in developmental mode, and was the primary selective force resulting in postclosure turritelline extinctions. John Wiley and Sons Inc. 2019-04-16 /pmc/articles/PMC6509377/ /pubmed/31110681 http://dx.doi.org/10.1002/ece3.5120 Text en © 2019 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Sang, Stephanie
Friend, Dana Suzanne
Allmon, Warren Douglas
Anderson, Brendan Matthew
Protoconch enlargement in Western Atlantic turritelline gastropod species following the closure of the Central American Seaway
title Protoconch enlargement in Western Atlantic turritelline gastropod species following the closure of the Central American Seaway
title_full Protoconch enlargement in Western Atlantic turritelline gastropod species following the closure of the Central American Seaway
title_fullStr Protoconch enlargement in Western Atlantic turritelline gastropod species following the closure of the Central American Seaway
title_full_unstemmed Protoconch enlargement in Western Atlantic turritelline gastropod species following the closure of the Central American Seaway
title_short Protoconch enlargement in Western Atlantic turritelline gastropod species following the closure of the Central American Seaway
title_sort protoconch enlargement in western atlantic turritelline gastropod species following the closure of the central american seaway
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6509377/
https://www.ncbi.nlm.nih.gov/pubmed/31110681
http://dx.doi.org/10.1002/ece3.5120
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