SHORT-TERM SEDIMENTATION PATTERN OF ZOOPLANKTON, FECES AND MICROPLANKTON AT A PERMANENT STATION IN THE BJORNAFJORDEN (NORWAY) DURING APRIL MAY 1992

被引:93
作者
GONZALEZ, HE [1 ]
GONZALEZ, SR [1 ]
BRUMMER, GJA [1 ]
机构
[1] NETHERLANDS INST SEA RES, 1790 AB DEN BURG, NETHERLANDS
关键词
NORWEGIAN FJORD; FECAL PELLETS; VERTICAL FLUX; PLANKTON;
D O I
10.3354/meps105031
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Sedimentation rates were determined daily over a 2 wk period (late April - early May 1992) under post spring bloom conditions at a permanent station in the Bjornafjorden, Norway. Samples collected using floating sediment traps deployed at 50 and 100 m depth showed that sedimented seston, particulate organic matter, carbonate and lithogenic + opal fractions were, on average, twice as high at 100 m (221, 99, 51 and 76 mg m-2 d-1, respectively) as at 50 m (119, 62, 27 and 34 Mg M-2 d-1, respectively). Faecal pellets made up the bulk of sedimenting matter, accounting for 87 and 92 % of the average total organic carbon recorded at 50 and 100 m, respectively. The remaining sedimented matter consisted mainly of tintinnids. Diatoms cells and resting spores, coccolithophorids and flagellates contributed a minor fraction. It is postulated that the vertical flux of faecal pellets was determined by a combination of 3 factors: (1) relatively high standing stock of actively grazing mesozooplankton dominated by calanoid copepods and appendicularians, which are known for their high faeces production rates; (2) a relatively high abundance of the cyclopoid copepod Oithona similis, which is reported to feed on faecal pellets produced by calanoid copepods, suggesting that coprophagy in the water column was high; (3) a phytoplankton community dominated by diatoms and coccolithophorids, whose mineral skeletons accelerate sinking rates of faecal pellets.
引用
收藏
页码:31 / 45
页数:15
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