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

Artikel i vetenskaplig tidskrift
Författare Peter Tiselius
J. K. Petersen
T. G. Nielsen
M. Maar
E. F. Moller
S. Satapoomin
K. Tonnesson
T. Zervoudaki
E. Christou
A. Giannakourou
A. Sell
C. Vargas
Publicerad i Marine Biology
Volym 142
Nummer/häfte 2
Sidor 253-261
ISSN 0025-3162
Publiceringsår 2003
Publicerad vid Institutionen för marin ekologi
Sidor 253-261
Språk en
Länkar <Go to ISI>://000181534800006
Ämnesord appendicularia, rates, tunicata, phytoplankton, vanhoeffeni, mechanisms, impact, waters, bloom
Ämneskategorier Biologiska vetenskaper, Ekologi

Sammanfattning

The functional response of the appendicularian Oikopleura dioica was investigated with a unialgal diet (Isochrysis galbana, 0-1,600 mug Cl-1) and with additions of specific concentrations of algae either smaller than the incurrent filter mesh size (Rhodomonas baltica, 90 mug Cl-1; Thalassiosira weissflogii, 60 mug Cl-1) or larger algae (Ceratium lineatum, 8 mug Cl-1; C. tripos, 52 mug C l(-1)). Clearance ranged from 0.13 to 3.3 ml mug 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 mug C-1 h(-1) and K-m = 64 mug C l(-1). Maximum pellet production was 9 pellets ind(-1) h(-1) and occurred at 100 mugC (-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 H-max = 4.6 houses ind(-1) day(-1) and K-m house = 32 mug Cl-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.

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