Relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.

Egg size is one of the fundamental parameters in the life histories of marine organisms. However, few studies have examined the relationships among egg size, composition, and energetic content in a phylogenetically controlled context. We investigated the associations among egg size, composition, and...

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Autores principales:	Justin S McAlister, Amy L Moran
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b44714a608534854afca37b5bb9bd2f0
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spelling	oai:doaj.org-article:b44714a608534854afca37b5bb9bd2f02021-11-18T07:11:25ZRelationships among egg size, composition, and energy: a comparative study of geminate sea urchins.1932-620310.1371/journal.pone.0041599https://doaj.org/article/b44714a608534854afca37b5bb9bd2f02012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22911821/?tool=EBIhttps://doaj.org/toc/1932-6203Egg size is one of the fundamental parameters in the life histories of marine organisms. However, few studies have examined the relationships among egg size, composition, and energetic content in a phylogenetically controlled context. We investigated the associations among egg size, composition, and energy using a comparative system, geminate species formed by the closure of the Central American Seaway. We examined western Atlantic (WA) and eastern Pacific (EP) species in three echinoid genera, Echinometra, Eucidaris, and Diadema. In the genus with the largest difference in egg size between geminates (Echinometra), the eggs of WA species were larger, lipid rich and protein poor compared to the smaller eggs of their EP geminate. In addition, the larger WA eggs had significantly greater total egg energy and summed biochemical constituents yet significantly lower egg energy density (energy-per-unit-volume). However, the genera with smaller (Eucidaris) or no (Diadema) differences in egg size were not significantly different in summed biochemical constituents, total egg energy, or energy density. Theoretical models generally assume a strong tradeoff between egg size and fecundity that limits energetic investment and constrains life history evolution. We show that even among closely-related taxa, large eggs cannot be assumed to be scaled-up small eggs either in terms of energy or composition. Although our data comes exclusively from echinoid echinoderms, this pattern may be generalizable to other marine invertebrate taxa. Because egg composition and egg size do not necessarily evolve in lockstep, selective factors such as sperm limitation could act on egg volume without necessarily affecting maternal or larval energetics.Justin S McAlisterAmy L MoranPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 7, p e41599 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Justin S McAlister Amy L Moran Relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.
description	Egg size is one of the fundamental parameters in the life histories of marine organisms. However, few studies have examined the relationships among egg size, composition, and energetic content in a phylogenetically controlled context. We investigated the associations among egg size, composition, and energy using a comparative system, geminate species formed by the closure of the Central American Seaway. We examined western Atlantic (WA) and eastern Pacific (EP) species in three echinoid genera, Echinometra, Eucidaris, and Diadema. In the genus with the largest difference in egg size between geminates (Echinometra), the eggs of WA species were larger, lipid rich and protein poor compared to the smaller eggs of their EP geminate. In addition, the larger WA eggs had significantly greater total egg energy and summed biochemical constituents yet significantly lower egg energy density (energy-per-unit-volume). However, the genera with smaller (Eucidaris) or no (Diadema) differences in egg size were not significantly different in summed biochemical constituents, total egg energy, or energy density. Theoretical models generally assume a strong tradeoff between egg size and fecundity that limits energetic investment and constrains life history evolution. We show that even among closely-related taxa, large eggs cannot be assumed to be scaled-up small eggs either in terms of energy or composition. Although our data comes exclusively from echinoid echinoderms, this pattern may be generalizable to other marine invertebrate taxa. Because egg composition and egg size do not necessarily evolve in lockstep, selective factors such as sperm limitation could act on egg volume without necessarily affecting maternal or larval energetics.
format	article
author	Justin S McAlister Amy L Moran
author_facet	Justin S McAlister Amy L Moran
author_sort	Justin S McAlister
title	Relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.
title_short	Relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.
title_full	Relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.
title_fullStr	Relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.
title_full_unstemmed	Relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.
title_sort	relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/b44714a608534854afca37b5bb9bd2f0
work_keys_str_mv	AT justinsmcalister relationshipsamongeggsizecompositionandenergyacomparativestudyofgeminateseaurchins AT amylmoran relationshipsamongeggsizecompositionandenergyacomparativestudyofgeminateseaurchins
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Relationships among egg size, composition, and energy: a comparative study of geminate sea urchins.

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