| This Article | |
 | |
 | Full Text |
| |
| Services | |
| |
| Alert me to new issues of the journal |
| Request Copyright Permission |
| ||||||||||||||||
Table 2. The specific ingestion of phototrophs by mixotrophic grazers in four situations (a–d)
|
|
PAR, m mol m- 2·s- 1 |
Biomass |
Growth, phototrophs,d- 1 |
Grazing rate, phototrophs, d- 1 |
Grazing of Phototrophs, m g C liter- -1·d- 1* |
Specific ingestion, ingestion mixotrophs, m g C m g C·d- 1†
m g C m g C- 1 · d- 1† |
|
|
Mixotrophs, m g C·liter- 1 |
Phototrophs, m g C·liter- 1 |
||||||
|
a |
60 |
91 |
42 |
0.14‡ |
0.14¶ |
6 |
0.07 |
|
b |
60 |
142 |
15 |
0.10‡ |
0.10¶ |
2 |
0.01 |
|
c |
60 |
41-79 |
3-99 |
0.58 |
0.02-0.30|| |
1.1-3.5 |
0.03-0.05 |
|
d |
120 |
156 |
13 |
0.64§ |
0.64¶ |
11 |
0.07 |
a, Lake 111 epilimnion 2001. b, Lake 111 epilimnion 2002. c, Batch experiment in which phototrophs were grown with mixotrophs and alone. d, Semicontinuous experiment with a loss rate of –0.02 d–1; values from day 108 (see text). The growth of phototrophs was balanced by grazing in a, b, and d.
*Estimated from biomass and the grazing rate of phototrophs.
†
Grazing of phototrophs divided by mixotrophic biomass.‡
Estimated from primary production measurements in Lake 111 (N.K., unpublished work).§
Derived from the PAR growth relationship of this phototroph with the same medium (1).¶
Grazing losses equaled production as net growth amounted roughly to zero over long timespans.||
Inferred from the difference between growth rates of Chlamydomonas when grazers were present or absent.1. Bissinger, V. (2003) Ph.D. thesis (Univ. of Potsdam, Potsdam, Germany).