PREY-SIZE DEPENDENCY OF GRAZING BY FREE-LIVING MARINE FLAGELLATES

被引:86
作者
MONGER, BC
LANDRY, MR
机构
关键词
D O I
10.3354/meps074239
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Currently, there are 3 distinct and conflicting predictions of the dependency on prey size of the clearance rates [(volume cleared of prey) flag.-1 time-1) of flagellates that feed by the mechanism of direct-interception. Clearance rates for this group of organisms have been predicted to be proportional roughly to either the first, second or third powers of prey radius indicating either weakly, moderately or strongly size-selective grazing behaviors, respectively. These predicted relationships were tested experimentally for cultured and natural flagellate populations fed mixtures of large and small fluorescently labelled prey (either heat-killed bacteria or latex microspheres). Evidence from 7 experiments indicated that flagellate feeding is only weakly size-selective; that is, clearance rate varies, roughly, in direct proportion to prey radius. These results provide preliminary support of a prey capture model that is based entirely on the interaction of hydrodynamic forces and surface forces arising between free-living marine flagellates and picoplankton-size prey. The extent to which small size provides a refuge from grazing mortality among the picoplankton, and the potential for a significant population of dormant bacteria, is probably less than previously believed; consequently the role of the most minute bacteria in pelagic food webs may require reexamination.
引用
收藏
页码:239 / 248
页数:10
相关论文
共 44 条
[1]   BACTERIOPLANKTON GROWTH IN SEAWATER .1. GROWTH-KINETICS AND CELLULAR CHARACTERISTICS IN SEAWATER CULTURES [J].
AMMERMAN, JW ;
FUHRMAN, JA ;
HAGSTROM, A ;
AZAM, F .
MARINE ECOLOGY PROGRESS SERIES, 1984, 18 (1-2) :31-39
[2]   SIZE-SELECTIVE GRAZING BY A MICROFLAGELLATE ON PELAGIC BACTERIA [J].
ANDERSSON, A ;
LARSSON, U ;
HAGSTROM, A .
MARINE ECOLOGY PROGRESS SERIES, 1986, 33 (01) :51-57
[3]  
AZAM F, 1990, BROCK SPR S, P477
[4]   THE ECOLOGICAL ROLE OF WATER-COLUMN MICROBES IN THE SEA [J].
AZAM, F ;
FENCHEL, T ;
FIELD, JG ;
GRAY, JS ;
MEYERREIL, LA ;
THINGSTAD, F .
MARINE ECOLOGY PROGRESS SERIES, 1983, 10 (03) :257-263
[5]  
BENNETT SJ, 1988, B MAR SCI, V43, P764
[6]   PROTOZOAN GRAZING, BACTERIAL-ACTIVITY, AND MINERALIZATION IN 2-STAGE CONTINUOUS CULTURES [J].
BLOEM, J ;
STARINK, M ;
BARGILISSEN, MJB ;
CAPPENBERG, TE .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1988, 54 (12) :3113-3121
[7]   ESTIMATING THE GRAZING PRESSURE OF HETEROTROPHIC NANOPLANKTON ON SYNECHOCOCCUS SPP USING THE SEA-WATER DILUTION AND SELECTIVE INHIBITOR TECHNIQUES [J].
CAMPBELL, L ;
CARPENTER, EJ .
MARINE ECOLOGY PROGRESS SERIES, 1986, 33 (02) :121-129
[8]   SELECTIVITY OF INGESTION AND DIGESTION IN CHRYSOMONAD FLAGELLATE OCHROMONAS-MALHAMENSIS [J].
DUBOWSKY, N .
JOURNAL OF PROTOZOOLOGY, 1974, 21 (02) :295-298
[9]  
FENCHEL T, 1986, ADV MICROB ECOL, V9, P57