Effect of lifespan and age on reproductive performance of the tardigrade Acutuncus antarcticus: minimal reproductive senescence

Megumu Tsujimoto, Osamu Komori, Satoshi Imura

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Reproductive output is one of the central attributes of life history, and knowledge of age-specific reproduction can enhance the understanding of population performance and dynamics. Tardigrades are microscopic invertebrates that live in marine, freshwater and terrestrial ecosystems. While changes in fertility in relation to age are known to occur in other invertebrate groups, the subject has not been specifically addressed in tardigrades. The current study demonstrates for the first time the effect of lifespan and age on reproductive characteristics of the tardigrade species, Acutuncus antarcticus (Richters 1904), based on the observation of individuals over their entire lifespan under constant environment conditions in the laboratory. Clutch size of A. antarcticus fluctuated conspicuously throughout individual lifespans. Weak effects of age were observed on oviposition interval and hatching success, with the former increasing slightly and the latter decreasing slightly with age. Numbers of oviposition events and eggs produced per individual varied greatly and were correlated with lifespan. No significant relationships between clutch size, hatching time or hatching success with lifespan were detected. The majority of the individuals continued oviposition until shortly before death, with no suggestion of a post-reproductive lifespan. Our observations suggest that any decline in fertility with age in this species of tardigrade is minimal. The study provides new insight into the reproductive biology and ageing of invertebrate species.

Original languageEnglish
Pages (from-to)93-102
Number of pages10
JournalHydrobiologia
Volume772
Issue number1
DOIs
Publication statusPublished - 2016 Jun 1
Externally publishedYes

Fingerprint

Tardigrada
senescence
reproductive performance
oviposition
hatching
invertebrate
invertebrates
clutch size
fertility
freshwater ecosystem
reproductive biology
terrestrial ecosystem
marine ecosystem
effect
life history
egg
death
Biological Sciences

Keywords

  • Ageing
  • Antarctica
  • Fertility
  • Tardigrada

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Effect of lifespan and age on reproductive performance of the tardigrade Acutuncus antarcticus : minimal reproductive senescence. / Tsujimoto, Megumu; Komori, Osamu; Imura, Satoshi.

In: Hydrobiologia, Vol. 772, No. 1, 01.06.2016, p. 93-102.

Research output: Contribution to journalArticle

@article{f94a0bedab96442e87b024a1c15ea739,
title = "Effect of lifespan and age on reproductive performance of the tardigrade Acutuncus antarcticus: minimal reproductive senescence",
abstract = "Reproductive output is one of the central attributes of life history, and knowledge of age-specific reproduction can enhance the understanding of population performance and dynamics. Tardigrades are microscopic invertebrates that live in marine, freshwater and terrestrial ecosystems. While changes in fertility in relation to age are known to occur in other invertebrate groups, the subject has not been specifically addressed in tardigrades. The current study demonstrates for the first time the effect of lifespan and age on reproductive characteristics of the tardigrade species, Acutuncus antarcticus (Richters 1904), based on the observation of individuals over their entire lifespan under constant environment conditions in the laboratory. Clutch size of A. antarcticus fluctuated conspicuously throughout individual lifespans. Weak effects of age were observed on oviposition interval and hatching success, with the former increasing slightly and the latter decreasing slightly with age. Numbers of oviposition events and eggs produced per individual varied greatly and were correlated with lifespan. No significant relationships between clutch size, hatching time or hatching success with lifespan were detected. The majority of the individuals continued oviposition until shortly before death, with no suggestion of a post-reproductive lifespan. Our observations suggest that any decline in fertility with age in this species of tardigrade is minimal. The study provides new insight into the reproductive biology and ageing of invertebrate species.",
keywords = "Ageing, Antarctica, Fertility, Tardigrada",
author = "Megumu Tsujimoto and Osamu Komori and Satoshi Imura",
year = "2016",
month = "6",
day = "1",
doi = "10.1007/s10750-016-2643-8",
language = "English",
volume = "772",
pages = "93--102",
journal = "Hydrobiologia",
issn = "0018-8158",
publisher = "Springer Netherlands",
number = "1",

}

TY - JOUR

T1 - Effect of lifespan and age on reproductive performance of the tardigrade Acutuncus antarcticus

T2 - minimal reproductive senescence

AU - Tsujimoto, Megumu

AU - Komori, Osamu

AU - Imura, Satoshi

PY - 2016/6/1

Y1 - 2016/6/1

N2 - Reproductive output is one of the central attributes of life history, and knowledge of age-specific reproduction can enhance the understanding of population performance and dynamics. Tardigrades are microscopic invertebrates that live in marine, freshwater and terrestrial ecosystems. While changes in fertility in relation to age are known to occur in other invertebrate groups, the subject has not been specifically addressed in tardigrades. The current study demonstrates for the first time the effect of lifespan and age on reproductive characteristics of the tardigrade species, Acutuncus antarcticus (Richters 1904), based on the observation of individuals over their entire lifespan under constant environment conditions in the laboratory. Clutch size of A. antarcticus fluctuated conspicuously throughout individual lifespans. Weak effects of age were observed on oviposition interval and hatching success, with the former increasing slightly and the latter decreasing slightly with age. Numbers of oviposition events and eggs produced per individual varied greatly and were correlated with lifespan. No significant relationships between clutch size, hatching time or hatching success with lifespan were detected. The majority of the individuals continued oviposition until shortly before death, with no suggestion of a post-reproductive lifespan. Our observations suggest that any decline in fertility with age in this species of tardigrade is minimal. The study provides new insight into the reproductive biology and ageing of invertebrate species.

AB - Reproductive output is one of the central attributes of life history, and knowledge of age-specific reproduction can enhance the understanding of population performance and dynamics. Tardigrades are microscopic invertebrates that live in marine, freshwater and terrestrial ecosystems. While changes in fertility in relation to age are known to occur in other invertebrate groups, the subject has not been specifically addressed in tardigrades. The current study demonstrates for the first time the effect of lifespan and age on reproductive characteristics of the tardigrade species, Acutuncus antarcticus (Richters 1904), based on the observation of individuals over their entire lifespan under constant environment conditions in the laboratory. Clutch size of A. antarcticus fluctuated conspicuously throughout individual lifespans. Weak effects of age were observed on oviposition interval and hatching success, with the former increasing slightly and the latter decreasing slightly with age. Numbers of oviposition events and eggs produced per individual varied greatly and were correlated with lifespan. No significant relationships between clutch size, hatching time or hatching success with lifespan were detected. The majority of the individuals continued oviposition until shortly before death, with no suggestion of a post-reproductive lifespan. Our observations suggest that any decline in fertility with age in this species of tardigrade is minimal. The study provides new insight into the reproductive biology and ageing of invertebrate species.

KW - Ageing

KW - Antarctica

KW - Fertility

KW - Tardigrada

UR - http://www.scopus.com/inward/record.url?scp=84957577945&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84957577945&partnerID=8YFLogxK

U2 - 10.1007/s10750-016-2643-8

DO - 10.1007/s10750-016-2643-8

M3 - Article

AN - SCOPUS:84957577945

VL - 772

SP - 93

EP - 102

JO - Hydrobiologia

JF - Hydrobiologia

SN - 0018-8158

IS - 1

ER -