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Kjellerup, Sanne; Dünweber, Michael; Swalethorp, Rasmus; Nielsen, Torkel Gissel; Møller, Eva Friis; Markager, Stiig; Hansen, Benni Winding (2012): Biological traits, and egg and fecal pellet production of Calanus finmarchicus and Calanus glacialis in situ and during experiments. PANGAEA,, Supplement to: Kjellerup, S et al. (2012): Effects of a future warmer ocean on the coexisting copepods Calanus finmarchicus and C. glacialis in Disko Bay, western Greenland. Marine Ecology Progress Series, 447, 87-108,

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The effects of temperature and food was examined for Calanus finmarchicus and C. glacialis during 3 phases of the phytoplankton spring bloom in Disko Bay, western Greenland. The 2 species were collected during pre-bloom, bloom, and post-bloom and exposed to temperatures from 0 to 10°C, combined with deficient or excess food. Fecal pellet and egg production were measured as indices for grazing and secondary production, respectively. Furthermore, changes in body carbon, nitrogen, and lipid content were measured. C. glacialis sampled before the bloom and incubated with excess food exhibited high specific egg production at temperatures between 0 and 2.5°C. Higher temperatures did not increase egg production considerably, whereas egg production for C. finmarchicus more than tripled between 2.5 and 5°C. Starved C. glacialis produced eggs at all temperatures stimulated by increasing temperatures, whereas starved C. finmarchicus needed temperatures above 5°C to produce eggs fueled by their lipid stores. Few C. finmarchicus had mature gonads at the initiation of the pre-bloom and bloom experiment, and egg production of C. finmarchicus therefore only increased as the ratio of individuals with mature gonads increased. During the bloom, both C. glacialis and C. finmarchicus used the high food availability for egg production, while refueling or exhausting their lipid stores, respectively. Finally, during the post-bloom experiment, production was low by C. finmarchicus, whereas C. glacialis had terminated production. Our results suggest that a future warmer ocean will reduce the advantage of early spawning by C. glacialis and that C. finmarchicus will become increasingly prevalent.
Related to:
Dünweber, Michael; Swalethorp, Rasmus; Kjellerup, Sanne; Nielsen, Torkel Gissel; Arendt, Kristine Engel; Hjorth, Morten; Tönnesson, Kajsa; Møller, Eva Friis (2010): Succession and fate of the spring diatom bloom in Disko Bay, western Greenland. Marine Ecology Progress Series, 419, 11-29,
Latitude: 69.233300 * Longitude: -53.433300
Date/Time Start: 2008-03-22T00:00:00 * Date/Time End: 2008-06-09T00:00:00
Disko_Bay_Q08 (off Qeqertarsuaq) * Latitude: 69.233300 * Longitude: -53.433300 * Date/Time Start: 2008-04-23T00:00:00 * Date/Time End: 2008-06-09T00:00:00 * Location: Disko Bay, Greenland * Device: Bottle, Niskin 10-L (NIS_10L)
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