1. Elevated temperature elicits greater effects than decreased pH on the development, feeding and metabolism of northern shrimp ( Pandalus borealis) larvae.
- Author
-
Arnberg, Maj, Calosi, Piero, Spicer, John, Tandberg, Anne, Nilsen, Marianne, Westerlund, Stig, and Bechmann, Renée
- Subjects
- *
PANDALUS borealis , *OCEAN temperature , *OCEAN acidification , *CALCIFICATION , *MARINE invertebrates , *ALGAL blooms , *REPRODUCTION - Abstract
Climate models predict that the average temperature in the North Sea could increase 3-5 °C and surface-waters pH could decrease 0.3-0.5 pH units by the end of this century. Consequently, we investigated the combined effect of decreased pH (control pH 8.1; decreased pH 7.6) and temperature (control 6.7 °C; elevated 9.5 °C) on the hatching timing and success, and the zoeal development, survival, feeding, respiration and growth (up to stage IV zoea) of the northern shrimp, Pandalus borealis. At elevated temperature, embryos hatched 3 days earlier, but experienced 2-4 % reduced survival. Larvae developed 9 days faster until stage IV zoea under elevated temperature and exhibited an increase in metabolic rates (ca 20 %) and an increase in feeding rates (ca 15-20 %). Decreased pH increased the development time, but only at the low temperature. We conclude that warming will likely exert a greater effect on shrimp larval development than ocean acidification manifesting itself as accelerated developmental rates with greater maintenance costs and decreased recruitment in terms of number and size. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF