摘要
In spring 2005, monthly sampling was carried out at a sublittoral site near Tautra Island. Microphytobenthic identification, abundance (ABU), and biomass (BIOM), were performed by microscopic analyses. Bacillariophyceae accounted for 67% of the total ABU, and phytoflagellates constituted 30%. The diatom floristic list consisted of 38 genera and 94 species. Intact light-harvesting pigments chl a, chl c, and fucoxanthin and their derivatives were identified and quantified by HPLC. Photoprotective carotenoids were also observed (only as diadinoxanthin; no diatoxanthin was detected). Average fucoxanthin content was 4.57 ± 0.45 μg fucoxanthin · g sediment dry mass−1, while the mean chl a concentration was 2.48 ± 0.15 μg · g−1 dry mass. Both the high fucoxanthin:chl a ratio (considering nondegraded forms) and low amounts of photoprotective carotenoids indicated that the benthic microalgal community was adapted to low light. Microphytobenthic primary production was estimated in situ (MPPs, from 0.15 to 1.28 mg C · m−2 · h−1) and in the laboratory (MPPp, from 6.79 to 34.70 mg C · m−2 · h−1 under light saturation) as 14C assimilation; in April it was additionally estimated from O2-microelectrode studies (MPPO2) along with the community respiration. MPPO2 and the community respiration equaled 22.9 ± 7.0 and 7.4 ± 1.8 mg C · m−2 · h−1, respectively. A doubling of BIOM from April to June in parallel with a decreasing photosynthetic activity per unit chl a led us to suggest that the microphytobenthic community was sustained by heterotrophic metabolism during this period.
摘要译文
2005年春，每月取样进行了近Tautra岛sublittoral网站。 Microphytobenthic识别，丰度（ABU），和生物质（BIOM），是由微观分析进行。硅藻占ABU的67％，而phytoflagellates占30％。硅藻区系组成名单38属，94种。完整的捕光色素叶绿素a，叶绿素c和岩藻黄质及其衍生物进行鉴定，并通过HPLC定量。光保护类胡萝卜素也观察到（只diadinoxanthin;没有检测到diatoxanthin）。平均藻褐素含量为4.57±0.45无论是高岩藻黄素：CHL的比例（考虑非降解形式）和少量的光保护类胡萝卜素表明，底栖微藻社会适应于低光。Microphytobenthic初级产量估计在原地（MPP时，从0.15到1.28毫克·C·米SUP70毫克·C·米SUP在4月，它是从O 2 -microelectrode研究（MPP O2）随着社会的呼吸还估计。 MPP O2和社会各界呼吸等于22.9±7.0和7.4±1。8毫克·C·米SUP米四月至六月平行单位减小的光合活性叶绿素a促使我们建议microphytobenthic社区在此期间持续通过异养代谢。
Tamara Cibic[1,‡]; Oriana Blasutto[2]; Kasper Hancke[3] and Geir Johnsen[3];. Microphytobenthic species composition, pigment concentration, and primary production in sublittoral sediments of the Trondheimsfjord (Norway)1[J]. Journal of Phycology, 2007,43(6): 1126-1137