Life-cycle synchrony in a marine copepod

Research output: Contribution to journalArticle

Abstract

It is clearly advantageous to an organism in a periodically varying environment to synchronise its life-cycle to that variation. Previous studies have demonstrated an effective mechanism by which such entrainment occurs at the individual level, through the response of development rate to varying conditions. It has been shown that synchrony requires two or more life stages that have characteristic and different developmental responses to the environment. One such difference, that has been shown to promote synchrony, is a stage specific period of arrested development (quiescence or diapause). Since the marine copepod Calanus finmarchicus undergoes just such a period of diapause, we test whether this provides a mechanism for synchrony. Using a simple model of the life-cycle we show that in the absence of diapause a population in Malangen Fjord, Norway, is unable to achieve synchrony. We then demonstrate the effectiveness of diapause in copepodite stage five in inducing entrainment. The timing of diapause is critical in determining the number of generations per year. The study highlights the importance of increasing our knowledge of Calanus finmarchicus diapause in order that we may better understand its ecology. We conclude that for this marine copepod diapause may play an important part in entraining its life-cycle to environmental periodicity.
LanguageEnglish
Pages327-337
Number of pages10
JournalErgebnisse der Limnologie
Issue number52
Publication statusPublished - 1998

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diapause
synchrony
life cycle
entrainment
fjord
periodicity
ecology

Keywords

  • life-cycle synchrony
  • marine copepod
  • developmental biology
  • mathematical and computational biology

Cite this

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title = "Life-cycle synchrony in a marine copepod",
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Life-cycle synchrony in a marine copepod. / Hind, A.; Gurney, William.

In: Ergebnisse der Limnologie , No. 52, 1998, p. 327-337.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Life-cycle synchrony in a marine copepod

AU - Hind, A.

AU - Gurney, William

PY - 1998

Y1 - 1998

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AB - It is clearly advantageous to an organism in a periodically varying environment to synchronise its life-cycle to that variation. Previous studies have demonstrated an effective mechanism by which such entrainment occurs at the individual level, through the response of development rate to varying conditions. It has been shown that synchrony requires two or more life stages that have characteristic and different developmental responses to the environment. One such difference, that has been shown to promote synchrony, is a stage specific period of arrested development (quiescence or diapause). Since the marine copepod Calanus finmarchicus undergoes just such a period of diapause, we test whether this provides a mechanism for synchrony. Using a simple model of the life-cycle we show that in the absence of diapause a population in Malangen Fjord, Norway, is unable to achieve synchrony. We then demonstrate the effectiveness of diapause in copepodite stage five in inducing entrainment. The timing of diapause is critical in determining the number of generations per year. The study highlights the importance of increasing our knowledge of Calanus finmarchicus diapause in order that we may better understand its ecology. We conclude that for this marine copepod diapause may play an important part in entraining its life-cycle to environmental periodicity.

KW - life-cycle synchrony

KW - marine copepod

KW - developmental biology

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