Journal
MARINE ECOLOGY PROGRESS SERIES
Volume 500, Issue -, Pages 83-101Publisher
INTER-RESEARCH
DOI: 10.3354/meps10661
Keywords
Temora longicornis; Respiration; Acclimatisation; Acute rate; Temperature; Reproduction
Categories
Funding
- European Commission FP7 EURO-BASIN (European Basin-Scale Analysis, Synthesis, and Integration) [264 933]
- Division Of Ocean Sciences
- Directorate For Geosciences [1154661] Funding Source: National Science Foundation
Ask authors/readers for more resources
We investigated the seasonal changes in the respiration rate (R) of adult Temora longicornis (Muller) acclimatised to in situ conditions over 1 yr. Mean (+/-1 SE) R varied from 50.5 +/- 2.8 nl O-2 ind.(-1) h(-1) in December to 73.2 +/- 3.53 nl O-2 ind.(-1) h(-1) in August for copepods of mean body dry weight (DW) of 33.5 +/- 1.1 and 26.3 +/- 0.95 mu g, respectively. Males represented similar to 8% of the total measurements, and their respiration did not differ significantly from that of females. R scaled isometrically with dry weight (DW), i.e. the allometric exponent of the power function (R = aDW(b)) did not differ significantly from unity (b = 0.83 to 1.35). The relationship between in situ weight-specific respiration rate (R-sp) and temperature (T) was described by a sigmoid trend with Q(10) ranging from 1 to 2.88 (mean 1.57 to 1.89). In contrast, the acclimated and acutely measured R-sp of copepods maintained under optimal feeding conditions in the laboratory increased exponentially with temperature and were characterised by higher mean Q(10) of 2.05 and 2.41, respectively. Acclimatised ln R increased significantly with ln DW, T, ln chlorophyll a (ln Chl) and ln egg production rate (ln EPR). Our results indicate that seasonal changes in T. longicornis respiration rate are not simply determined by body mass and temperature but also reflect copepod nutritional and reproductive condition. We argue that predictive ecological models using fixed thermal coefficient values may overestimate copepod respiration, particularly under ambient conditions limiting growth and reproduction. Our findings have important implications for the calculation of carbon flow in marine food-webs and for understanding how zooplankton physiology responds to changes in global temperature.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available