Nyctiphanes simplex (Crustacea: Euphausiacea) temporal association of embryogenesis and early larval development with female molt and ovarian cycles

Dellis Montuy-Gómez, Jaime Gómez-Gutiérrez, Carmen Rodrguez-Jaramillo, Carlos J. Robinson

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Embryogenesis (single cell to twitching stage) and early larval stages (nauplius to calyptopis 3) internal morphology of the sac-spawning species Nyctiphanes simplex was investigated to explore its temporal association with gonad development and molt development cycles. Krill were collected and incubated shipboard in July 2007 and March 2010 in the Gulf of California. Cleavage patterns were similar to what is observed in broadcast-spawning species, suggesting a close phylogenetic consistency between krill species with distinct spawning strategies. Nyctiphanes simplex, like broadcast-spawning krill species, had eight Kranzzellen (K1-K8) cells during the blastula stage. The gonad of ovigerous females with embryos in the cell division stage is in the multiplication stage (Stage I). From the nauplius stage, most females are in previtellogenesis (Stage II). Only females with metanauplii occasionally have gonads in vitellogenesis (Stage III). Gonad maturity (Stage IV) occurs only after the release of the embryos from the ovigerous sac. Females with an ovigerous sac were invariably at the intermolt stage, suggesting a precise synchronization among processes of molting, gonad development and embryo release to produce consecutive broods. Lipid and carbohydrate storage decreased exponentially throughout embryonic and early larval development, depending on their endogenous reserves. When metanauplii leave the ovigerous sac, they have low storage lipid (<2) and carbohydrate (<5). These proportions suggest a theoretically short period-of-no-return (<2 days), when they transform into the first feeding stage (calyptopis 1). © 2012 The Author.
Original languageAmerican English
Pages (from-to)531-547
Number of pages17
JournalJournal of Plankton Research
DOIs
StatePublished - 1 Jun 2012
Externally publishedYes

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Euphausiacea
molt
larval development
molting
gonads
spawning
embryogenesis
Crustacea
krill
embryo
embryo (animal)
carbohydrate
nauplii
lipid
carbohydrates
cleavage
Gulf of California
vitellogenesis
lipids
maturity stage

Cite this

@article{6040923cd4fb4a288212e521a27ed1b3,
title = "Nyctiphanes simplex (Crustacea: Euphausiacea) temporal association of embryogenesis and early larval development with female molt and ovarian cycles",
abstract = "Embryogenesis (single cell to twitching stage) and early larval stages (nauplius to calyptopis 3) internal morphology of the sac-spawning species Nyctiphanes simplex was investigated to explore its temporal association with gonad development and molt development cycles. Krill were collected and incubated shipboard in July 2007 and March 2010 in the Gulf of California. Cleavage patterns were similar to what is observed in broadcast-spawning species, suggesting a close phylogenetic consistency between krill species with distinct spawning strategies. Nyctiphanes simplex, like broadcast-spawning krill species, had eight Kranzzellen (K1-K8) cells during the blastula stage. The gonad of ovigerous females with embryos in the cell division stage is in the multiplication stage (Stage I). From the nauplius stage, most females are in previtellogenesis (Stage II). Only females with metanauplii occasionally have gonads in vitellogenesis (Stage III). Gonad maturity (Stage IV) occurs only after the release of the embryos from the ovigerous sac. Females with an ovigerous sac were invariably at the intermolt stage, suggesting a precise synchronization among processes of molting, gonad development and embryo release to produce consecutive broods. Lipid and carbohydrate storage decreased exponentially throughout embryonic and early larval development, depending on their endogenous reserves. When metanauplii leave the ovigerous sac, they have low storage lipid (<2) and carbohydrate (<5). These proportions suggest a theoretically short period-of-no-return (<2 days), when they transform into the first feeding stage (calyptopis 1). {\circledC} 2012 The Author.",
author = "Dellis Montuy-G{\'o}mez and Jaime G{\'o}mez-Guti{\'e}rrez and Carmen Rodrguez-Jaramillo and Robinson, {Carlos J.}",
year = "2012",
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Nyctiphanes simplex (Crustacea: Euphausiacea) temporal association of embryogenesis and early larval development with female molt and ovarian cycles. / Montuy-Gómez, Dellis; Gómez-Gutiérrez, Jaime; Rodrguez-Jaramillo, Carmen; Robinson, Carlos J.

In: Journal of Plankton Research, 01.06.2012, p. 531-547.

Research output: Contribution to journalArticle

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T1 - Nyctiphanes simplex (Crustacea: Euphausiacea) temporal association of embryogenesis and early larval development with female molt and ovarian cycles

AU - Montuy-Gómez, Dellis

AU - Gómez-Gutiérrez, Jaime

AU - Rodrguez-Jaramillo, Carmen

AU - Robinson, Carlos J.

PY - 2012/6/1

Y1 - 2012/6/1

N2 - Embryogenesis (single cell to twitching stage) and early larval stages (nauplius to calyptopis 3) internal morphology of the sac-spawning species Nyctiphanes simplex was investigated to explore its temporal association with gonad development and molt development cycles. Krill were collected and incubated shipboard in July 2007 and March 2010 in the Gulf of California. Cleavage patterns were similar to what is observed in broadcast-spawning species, suggesting a close phylogenetic consistency between krill species with distinct spawning strategies. Nyctiphanes simplex, like broadcast-spawning krill species, had eight Kranzzellen (K1-K8) cells during the blastula stage. The gonad of ovigerous females with embryos in the cell division stage is in the multiplication stage (Stage I). From the nauplius stage, most females are in previtellogenesis (Stage II). Only females with metanauplii occasionally have gonads in vitellogenesis (Stage III). Gonad maturity (Stage IV) occurs only after the release of the embryos from the ovigerous sac. Females with an ovigerous sac were invariably at the intermolt stage, suggesting a precise synchronization among processes of molting, gonad development and embryo release to produce consecutive broods. Lipid and carbohydrate storage decreased exponentially throughout embryonic and early larval development, depending on their endogenous reserves. When metanauplii leave the ovigerous sac, they have low storage lipid (<2) and carbohydrate (<5). These proportions suggest a theoretically short period-of-no-return (<2 days), when they transform into the first feeding stage (calyptopis 1). © 2012 The Author.

AB - Embryogenesis (single cell to twitching stage) and early larval stages (nauplius to calyptopis 3) internal morphology of the sac-spawning species Nyctiphanes simplex was investigated to explore its temporal association with gonad development and molt development cycles. Krill were collected and incubated shipboard in July 2007 and March 2010 in the Gulf of California. Cleavage patterns were similar to what is observed in broadcast-spawning species, suggesting a close phylogenetic consistency between krill species with distinct spawning strategies. Nyctiphanes simplex, like broadcast-spawning krill species, had eight Kranzzellen (K1-K8) cells during the blastula stage. The gonad of ovigerous females with embryos in the cell division stage is in the multiplication stage (Stage I). From the nauplius stage, most females are in previtellogenesis (Stage II). Only females with metanauplii occasionally have gonads in vitellogenesis (Stage III). Gonad maturity (Stage IV) occurs only after the release of the embryos from the ovigerous sac. Females with an ovigerous sac were invariably at the intermolt stage, suggesting a precise synchronization among processes of molting, gonad development and embryo release to produce consecutive broods. Lipid and carbohydrate storage decreased exponentially throughout embryonic and early larval development, depending on their endogenous reserves. When metanauplii leave the ovigerous sac, they have low storage lipid (<2) and carbohydrate (<5). These proportions suggest a theoretically short period-of-no-return (<2 days), when they transform into the first feeding stage (calyptopis 1). © 2012 The Author.

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JO - Journal of Plankton Research

JF - Journal of Plankton Research

SN - 0142-7873

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