Temperature effects on copepod egg hatching: does acclimatization matter?

Benni Winding Hansen, Guillaume Drillet, A. Kozmér, K.V. Madsen, M.F. Pedersen, T.F. Sørensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This report investigates female sizes, egg sizes and egg hatching rates in relation to temperature for the near-shore calanoid copepod Acartia tonsa cultured at 6, 9, 14 and 24°C for several generations to achieve acclimatization. Inverse size relationships of eggs and females were revealed with increasing temperature. Eggs produced at 6°C were 85 ± 4 µm in diameter, but decreased to 80 ± 3 µm at 24°C. Female cephalothorax length was 840 ± 52 and 692 ± 39 µm at 9 and 24°C, respectively. Parallel hatching experiments were performed between non-acclimatized and acclimatized cultures across a range of temperatures reflecting natural conditions in Danish waters. A greater fraction of eggs enter quiescence as temperature declines. Eggs were able to hatch at temperatures as low as 1.5°C. Final egg hatching success increased with temperature. Acclimatization of the copepods resulted in a lower maximum hatching rate, but a higher final hatching success at 9 and 6°C compared with egg hatching from non-acclimatized copepods. Eggs develop significantly better at low temperatures when compared with females in culture. This adaptation suggests that the observed annual population fluctuations in, for example, Danish waters can be explained as follows: the population of copepods in the pelagic virtually die out during the autumn–winter months; the population the following year emerges from resting eggs from the sediment and is produced by the pelagic copepods the previous year(s).
Original languageEnglish
JournalJournal of Plankton Research
Volume32
Issue number3
Pages (from-to)305-315
ISSN0142-7873
DOIs
Publication statusPublished - 2010

Cite this

Hansen, B. W., Drillet, G., Kozmér, A., Madsen, K. V., Pedersen, M. F., & Sørensen, T. F. (2010). Temperature effects on copepod egg hatching: does acclimatization matter? Journal of Plankton Research, 32(3), 305-315. https://doi.org/10.1093/plankt/fbp122
Hansen, Benni Winding ; Drillet, Guillaume ; Kozmér, A. ; Madsen, K.V. ; Pedersen, M.F. ; Sørensen, T.F. / Temperature effects on copepod egg hatching: does acclimatization matter?. In: Journal of Plankton Research. 2010 ; Vol. 32, No. 3. pp. 305-315.
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Hansen, BW, Drillet, G, Kozmér, A, Madsen, KV, Pedersen, MF & Sørensen, TF 2010, 'Temperature effects on copepod egg hatching: does acclimatization matter?', Journal of Plankton Research, vol. 32, no. 3, pp. 305-315. https://doi.org/10.1093/plankt/fbp122

Temperature effects on copepod egg hatching: does acclimatization matter? / Hansen, Benni Winding; Drillet, Guillaume; Kozmér, A.; Madsen, K.V.; Pedersen, M.F.; Sørensen, T.F.

In: Journal of Plankton Research, Vol. 32, No. 3, 2010, p. 305-315.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Temperature effects on copepod egg hatching: does acclimatization matter?

AU - Hansen, Benni Winding

AU - Drillet, Guillaume

AU - Kozmér, A.

AU - Madsen, K.V.

AU - Pedersen, M.F.

AU - Sørensen, T.F.

PY - 2010

Y1 - 2010

N2 - This report investigates female sizes, egg sizes and egg hatching rates in relation to temperature for the near-shore calanoid copepod Acartia tonsa cultured at 6, 9, 14 and 24°C for several generations to achieve acclimatization. Inverse size relationships of eggs and females were revealed with increasing temperature. Eggs produced at 6°C were 85 ± 4 µm in diameter, but decreased to 80 ± 3 µm at 24°C. Female cephalothorax length was 840 ± 52 and 692 ± 39 µm at 9 and 24°C, respectively. Parallel hatching experiments were performed between non-acclimatized and acclimatized cultures across a range of temperatures reflecting natural conditions in Danish waters. A greater fraction of eggs enter quiescence as temperature declines. Eggs were able to hatch at temperatures as low as 1.5°C. Final egg hatching success increased with temperature. Acclimatization of the copepods resulted in a lower maximum hatching rate, but a higher final hatching success at 9 and 6°C compared with egg hatching from non-acclimatized copepods. Eggs develop significantly better at low temperatures when compared with females in culture. This adaptation suggests that the observed annual population fluctuations in, for example, Danish waters can be explained as follows: the population of copepods in the pelagic virtually die out during the autumn–winter months; the population the following year emerges from resting eggs from the sediment and is produced by the pelagic copepods the previous year(s).

AB - This report investigates female sizes, egg sizes and egg hatching rates in relation to temperature for the near-shore calanoid copepod Acartia tonsa cultured at 6, 9, 14 and 24°C for several generations to achieve acclimatization. Inverse size relationships of eggs and females were revealed with increasing temperature. Eggs produced at 6°C were 85 ± 4 µm in diameter, but decreased to 80 ± 3 µm at 24°C. Female cephalothorax length was 840 ± 52 and 692 ± 39 µm at 9 and 24°C, respectively. Parallel hatching experiments were performed between non-acclimatized and acclimatized cultures across a range of temperatures reflecting natural conditions in Danish waters. A greater fraction of eggs enter quiescence as temperature declines. Eggs were able to hatch at temperatures as low as 1.5°C. Final egg hatching success increased with temperature. Acclimatization of the copepods resulted in a lower maximum hatching rate, but a higher final hatching success at 9 and 6°C compared with egg hatching from non-acclimatized copepods. Eggs develop significantly better at low temperatures when compared with females in culture. This adaptation suggests that the observed annual population fluctuations in, for example, Danish waters can be explained as follows: the population of copepods in the pelagic virtually die out during the autumn–winter months; the population the following year emerges from resting eggs from the sediment and is produced by the pelagic copepods the previous year(s).

U2 - 10.1093/plankt/fbp122

DO - 10.1093/plankt/fbp122

M3 - Journal article

VL - 32

SP - 305

EP - 315

JO - Journal of Plankton Research

JF - Journal of Plankton Research

SN - 0142-7873

IS - 3

ER -

Hansen BW, Drillet G, Kozmér A, Madsen KV, Pedersen MF, Sørensen TF. Temperature effects on copepod egg hatching: does acclimatization matter? Journal of Plankton Research. 2010;32(3):305-315. https://doi.org/10.1093/plankt/fbp122