Van Geest, G.J. and Spierenburg, P. and Van Donk, E. and Hessen, D. O. (2007) Daphnia growth rates in Arctic ponds: limitation by nutrients or carbon? Polar Biology, 30(3), 235-242. ISSN 0722-4060. Doi: 10.1007/s00300-006-0177-7.
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Official URL: http://dx.doi.org/10.1007/s00300-006-0177-7
Arctic organisms with annual life cycles experience a strong selective pressure to fulfill their life cycle at low temperatures within a short seasonal window. Yet, apart from low temperature, the factors that constrain or promote growth rates in high arctic systems are still poorly understood. A substantial part of the freshwater systems in the arctic consist of shallow, fish-free ponds with the crustacean Daphnia as the key grazer. This grazer has high demands for phosphorus (P) for RNA-synthesis and subsequently protein synthesis for growth. In this study, we compared growth of juvenile Daphnia that were fed seston from two high-Arctic (79°N) ponds on Svalbard in 2004, which differed strongly in P-content and C:P-ratios. In both ponds, Daphnia growth was limited by food quantity (carbon) rather than by P or N. The study also suggests that in absence of predators, infection level of epibionts might be an important factor regulating growth rate and population development of Daphnia growth in these systems.
|Additional Information:||Doi: 10.1007/s00300-006-0177-7|
|Institutes:||Nederlands Instituut voor Ecologie (NIOO)|
|Deposited On:||15 Sep 2009 02:00|
|Last Modified:||25 May 2012 09:05|
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