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Temperature affects respiration rate of Oithona similis

Temperature affects respiration rate of Oithona similis
Temperature affects respiration rate of Oithona similis
Oithona spp. is considered the most abundant and ubiquitous copepod genus in the marine environment, often outnumbering calanoid copepods throughout the year. Previous studies have argued that one of the reasons for such success is that the respiration rate of Oithona spp. is insensitive to temperature changes and lower than in calanoids. However, comprehensive data on the thermal biology of this important copepod genus is lacking. In this study, the respiration rate of adult female O. similis from the English Channel, was measured over the temperature range 4 to 25°C. The respiration rate of O. similis changed exponentially with temperature (ln O2-rate = –3.59 + 0.114 T, df = 35, r2 = 0.85, p < 0.001, Q10 = 3.1) similar to that of other poikilotherms. Over the temperature range examined, O. similis basic metabolic cost varied from a minimum of ~1.4% body-C d–1 at 4°C to a maximum of 23% body-C d–1 at 25°C, corresponding to an energy demand of ~3% and 32% body-C d–1 respectively. The respiration rate of O. similis, from the present study, is ~8 times lower than that of a calanoid copepod of equivalent body weight estimated from published empirical metabolism–temperature data. We suggest that these differences in metabolic rates may account for the year-round persistence and higher abundances of Oithona spp. over calanoid copepods, particularly in oceanic and oligotrophic environments where food resources may be limiting for calanoid copepods.
129-135
Castellani, C.
d072ee09-3ed4-47c1-a9a2-8143fd00dfc9
Robinson, C.
3c57dfcb-6ddc-4e4b-8d7e-5efd0adcc42b
Smith, T.
8af789d2-e097-40af-9632-514501c3c2f1
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad
Castellani, C.
d072ee09-3ed4-47c1-a9a2-8143fd00dfc9
Robinson, C.
3c57dfcb-6ddc-4e4b-8d7e-5efd0adcc42b
Smith, T.
8af789d2-e097-40af-9632-514501c3c2f1
Lampitt, R.S.
dfc3785c-fc7d-41fa-89ee-d0c6e27503ad

Castellani, C., Robinson, C., Smith, T. and Lampitt, R.S. (2005) Temperature affects respiration rate of Oithona similis. Marine Ecology Progress Series, 285, 129-135. (doi:10.3354/meps285129).

Record type: Article

Abstract

Oithona spp. is considered the most abundant and ubiquitous copepod genus in the marine environment, often outnumbering calanoid copepods throughout the year. Previous studies have argued that one of the reasons for such success is that the respiration rate of Oithona spp. is insensitive to temperature changes and lower than in calanoids. However, comprehensive data on the thermal biology of this important copepod genus is lacking. In this study, the respiration rate of adult female O. similis from the English Channel, was measured over the temperature range 4 to 25°C. The respiration rate of O. similis changed exponentially with temperature (ln O2-rate = –3.59 + 0.114 T, df = 35, r2 = 0.85, p < 0.001, Q10 = 3.1) similar to that of other poikilotherms. Over the temperature range examined, O. similis basic metabolic cost varied from a minimum of ~1.4% body-C d–1 at 4°C to a maximum of 23% body-C d–1 at 25°C, corresponding to an energy demand of ~3% and 32% body-C d–1 respectively. The respiration rate of O. similis, from the present study, is ~8 times lower than that of a calanoid copepod of equivalent body weight estimated from published empirical metabolism–temperature data. We suggest that these differences in metabolic rates may account for the year-round persistence and higher abundances of Oithona spp. over calanoid copepods, particularly in oceanic and oligotrophic environments where food resources may be limiting for calanoid copepods.

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Published date: 2005
Organisations: National Oceanography Centre,Southampton

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Local EPrints ID: 24057
URI: https://eprints.soton.ac.uk/id/eprint/24057
PURE UUID: 17362a8a-11b3-4705-8da0-85f01a47206e

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Date deposited: 20 Mar 2006
Last modified: 17 Jul 2017 16:15

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Contributors

Author: C. Castellani
Author: C. Robinson
Author: T. Smith
Author: R.S. Lampitt

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