The importance of temperature and lipid accumulation for initiation and duration of Calanus hyperboreus spawning

TY - JOUR

T1 - The importance of temperature and lipid accumulation for initiation and duration of Calanus hyperboreus spawning

AU - Schultz, Mads

AU - Nielsen, Torkel Gissel

AU - Møller, Eva Friis

PY - 2020

Y1 - 2020

N2 - Large, lipid-storing copepods play a central role in marine Arctic ecosystems. Knowledge of the mechanisms that control their oogenesis is important for understanding their phenology and population dynamics. We investigated the impact of female lipid content on the timing and cumulative egg production (EP) of Calanus hyperboreus at 0, 3 and 6°C. The lipid content of females in early autumn was a good predictor of their EP potential. However, we saw no indication of a threshold in lipid content for initiation of spawning. Higher temperature resulted in 17 and 24 days earlier spawning at 3 and 6°C compared with 0°C, and the mean spawning duration was 8 and 30 days shorter, respectively. This illustrates that temperature affects the phenology of C. hyperboreus. When EP began, lipid metabolism increased 2-4 times. The females allocated 1.3 μg lipid per egg independent of temperature. However, the basic metabolism increased with increasing temperature; consequently, a smaller fraction of lipid was allocated for EP when the temperature increased.

AB - Large, lipid-storing copepods play a central role in marine Arctic ecosystems. Knowledge of the mechanisms that control their oogenesis is important for understanding their phenology and population dynamics. We investigated the impact of female lipid content on the timing and cumulative egg production (EP) of Calanus hyperboreus at 0, 3 and 6°C. The lipid content of females in early autumn was a good predictor of their EP potential. However, we saw no indication of a threshold in lipid content for initiation of spawning. Higher temperature resulted in 17 and 24 days earlier spawning at 3 and 6°C compared with 0°C, and the mean spawning duration was 8 and 30 days shorter, respectively. This illustrates that temperature affects the phenology of C. hyperboreus. When EP began, lipid metabolism increased 2-4 times. The females allocated 1.3 μg lipid per egg independent of temperature. However, the basic metabolism increased with increasing temperature; consequently, a smaller fraction of lipid was allocated for EP when the temperature increased.

KW - Calanus hyperboreus

KW - egg production

KW - lipid

KW - phenology

KW - spawning

UR - http://www.scopus.com/inward/record.url?scp=85089544475&partnerID=8YFLogxK

U2 - 10.1093/plankt/fbaa003

DO - 10.1093/plankt/fbaa003

M3 - Journal article

SN - 0142-7873

VL - 42

SP - 159

EP - 171

JO - Journal of Plankton Research

JF - Journal of Plankton Research

IS - 2

ER -