Intense winter heterotrophic production stimulated by benthic resuspension

被引:77
作者
Cotner, JB [1 ]
机构
[1] Univ Minnesota, Dept Ecol Evolut & Behav, St Paul, MN 55108 USA
关键词
D O I
10.4319/lo.2000.45.7.1672
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
A major episodic sediment resuspension event (25-yr high), which was triggered by atmospheric and water column instability in an El Nino year, temporarily altered the dynamics of autotrophy and heterotrophy in Lake Michigan. Resuspended sediments, rich in organic and inorganic nutrients, especially phosphorus, stimulated heterotrophic production despite low water temperatures (2 degreesC or less). During the resuspension event, southern basin winter heterotrophic bacterial productivity was high (64% of summertime productivity) especially along the margins of the lake. The mean bacterial cell size increased in regions where productivity was highest during the resuspension event. Although resuspended sediments stimulated bacterial secondary productivity, hey simultaneously decreased water-column light availability and autotroph biomass. Consequently, heterotrophic bacteria were temporally decoupled from the commonly recognized source of organic matter for bacterial production-photoautotrophy. Variation in the magnitude and frequency of these resuspension events likely influences variation in interannual productivity in this system. Such previously underappreciated, intermittent, and ephemeral benthic-pelagic exchange events may significantly influence plankton dynamics and biogeochemical cycling in coastal marine and freshwater ecosystems.
引用
收藏
页码:1672 / 1676
页数:5
相关论文
共 27 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]  
[Anonymous], 1992, STAND METH EX WAT WA
[3]   THE PRODUCTION OF DISSOLVED ORGANIC-MATTER BY PHYTOPLANKTON AND ITS IMPORTANCE TO BACTERIA - PATTERNS ACROSS MARINE AND FRESH-WATER SYSTEMS [J].
BAINES, SB ;
PACE, ML .
LIMNOLOGY AND OCEANOGRAPHY, 1991, 36 (06) :1078-1090
[4]   PLANKTON RESPIRATION AND CARBON FLUX THROUGH BACTERIOPLANKTON ON THE LOUISIANA SHELF [J].
BIDDANDA, B ;
OPSAHL, S ;
BENNER, R .
LIMNOLOGY AND OCEANOGRAPHY, 1994, 39 (06) :1259-1275
[5]   BACTERIAL BIOVOLUME AND BIOMASS ESTIMATIONS [J].
BRATBAK, G .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1985, 49 (06) :1488-1493
[6]   WIND INFLUENCES PHYTOPLANKTON BIOMASS AND COMPOSITION IN A SHALLOW, PRODUCTIVE LAKE [J].
CARRICK, HJ ;
ALDRIDGE, FJ ;
SCHELSKE, CL .
LIMNOLOGY AND OCEANOGRAPHY, 1993, 38 (06) :1179-1192
[7]   UPTAKE OF DISSOLVED INORGANIC AND ORGANIC PHOSPHORUS-COMPOUNDS BY PHYTOPLANKTON AND BACTERIOPLANKTON [J].
COTNER, JB ;
WETZEL, RG .
LIMNOLOGY AND OCEANOGRAPHY, 1992, 37 (02) :232-243
[8]   Phosphorus-limited bacterioplankton growth in the Sargasso Sea [J].
Cotner, JB ;
Ammerman, JW ;
Peele, ER ;
Bentzen, E .
AQUATIC MICROBIAL ECOLOGY, 1997, 13 (02) :141-149
[9]   SEDIMENT TRAP STUDIES IN LAKE-MICHIGAN - RESUSPENSION AND CHEMICAL FLUXES IN THE SOUTHERN BASIN [J].
EADIE, BJ ;
CHAMBERS, RL ;
GARDNER, WS ;
BELL, GL .
JOURNAL OF GREAT LAKES RESEARCH, 1984, 10 (03) :307-321
[10]  
EADIE BJ, 1996, J GREAT LAKES RES, V77, P337