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Marine Biology

, Volume 142, Issue 2, pp 253–261 | Cite as

Functional response of Oikopleura dioica to house clogging due to exposure to algae of different sizes

  •  P. Tiselius
  •  J. Petersen
  •  T. Nielsen
  •  M. Maar
  •  E. Møller
  •  S. Satapoomin
  •  K. Tönnesson
  •  T. Zervoudaki
  •  E. Christou
  •  A. Giannakourou
  •  A. Sell
  •  C. Vargas

Abstract.

The functional response of the appendicularian Oikopleura dioica was investigated with a unialgal diet (Isochrysis galbana, 0–1,600 µg C l–1) and with additions of specific concentrations of algae either smaller than the incurrent filter mesh size (Rhodomonas baltica, 90 µg C l–1; Thalassiosira weissflogii, 60 µg C l–1) or larger algae (Ceratium lineatum, 8 µg C l–1; C. tripos, 52 µg C l–1). Clearance ranged from 0.13 to 3.3 ml µg C–1 h–1 and followed a Michaelis–Menten curve corresponding to a maximum filtration rate (particles collected by both animal and house), FRmax=164 ng C µg C–1 h–1 and Km=64 µg C l–1. Maximum pellet production was 9 pellets ind–1 h–1 and occurred at 100  µgC l–1. Pellet production was proportional to filtration rate below this level, but declined at higher concentrations. House production ranged from 0.5 to 5.5 houses ind–1 day–1 and the corresponding curve fit resulted in Hmax=4.6 houses ind–1 day–1 and Km house=32 µg C l–1. Addition of edible small algae caused increased internal clogging of the houses, evidenced by significantly higher pigment concentrations in abandoned houses than in houses produced with I. galbana as a single food. House production was not affected. In contrast, larger algae caused a significantly higher house production, but the algae were not collected on the houses. Increased levels of edible algae will not have negative effects on O. dioica at ecologically realistic concentrations. Ambient bloom concentrations of larger algae may, however, have a negative effect on the growth of O. dioica populations, owing to the compensatory increased house production.

Keywords

Functional Response Isochrysis Filter Mesh Pellet Production House Production 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  •  P. Tiselius
    • 1
  •  J. Petersen
    • 2
  •  T. Nielsen
    • 2
  •  M. Maar
    • 2
  •  E. Møller
    • 2
  •  S. Satapoomin
    • 3
  •  K. Tönnesson
    • 1
  •  T. Zervoudaki
    • 4
  •  E. Christou
    • 4
  •  A. Giannakourou
    • 4
  •  A. Sell
    • 5
  •  C. Vargas
    • 1
  1. 1.Department of Marine Ecology, Göteborg University, Kristineberg Marine Research Station, 450–34 Fiskebäckskil, Sweden
  2. 2.National Environmental Research Institute, PO Box 359, 4000 Roskilde, Denmark
  3. 3.Phuket Marine Biological Centre, PO Box 60, Phuket 83000, Thailand
  4. 4.National Centre for Marine Research, 16604 Hellenikon, Athens, Greece
  5. 5.Present address: Institut for Hydrobiology and Fisheries, University of Hamburg, Olbersweg 24, 22767 Hamburg, Germany

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