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Title 

Diel and vertical variability of seston food quality and quantity in a small subalpine oligomesotrophic lake

Authors 

Sangkyu ParkS ChandraD C Muller-NavarraC R Goldman

Publisher 

Oxford University Press (OUP)

Issue Date 

2004

Citation 

Journal of Plankton Research, vol. 26, no. 12, pp. 1489-1498

Keywords 

diel variationfood availabilityfood qualitylake ecosystemsestonvertical distributioncaliforniacastle lakenorth americaUnited States

Abstract 

Vertical profiles of seston food quality and quantity were measured in subalpine Castle Lake for particulate carbon, chlorophyll a, fatty acids and phosphorus in addition to abiotic parameters including water temperature and dissolved oxygen levels. Field and laboratory incubation experiments were employed to manipulate Daphnia rosea growth environments. Sestonic eicosapentaenoic acid (EPA) content was much lower, whereas carbon to phosphorus (C:P) ratios were much higher in the epilimnion compared to the deep-water chlorophyll maximum (16-20 m). In a temperature-controlled incubation, Daphnia grew faster when fed seston from the deep-water chlorophyll maximum. In in situ cage incubations, D. rosea grew fastest in the epilimnion. Daphnia rosea in a migrating treatment exhibited intermediate growth rates between the ones for epilimnion and hypolimnion. A projection of D. rosea growth rates by growth models without regard to water temperature showed much higher growth potentials in the hypolimnion. However, with inclusion of water temperature, epilimnetic water always gave higher potential growth rates. In this lake, warmer temperatures of epilimnetic water override the higher food quality and quantity provided by the deep-water chlorophyll maximum.

ISSN 

0142-7873

Link 

http://dx.doi.org/10.1093/plankt/fbh136

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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