Microphytobenthos of Arctic Kongsfjorden (Svalbard, Norway): biomass and potential primary production along the shore line
Microphytobenthos of Arctic Kongsfjorden (Svalbard, Norway): biomass and potential primary production along the shore line
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北极 Kongsfjorden（挪威斯瓦尔巴群岛）的微型底栖植物：沿海岸线的生物量和潜在初级生产
DOI：
10.1007/s00300-010-0813-0
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发表时间：
2010
期刊：
影响因子：
1.7
通讯作者：
U. Karsten
中科院分区：
文献类型：
--
作者：
J. Woelfel;R. Schumann;Florian Peine;A. Flohr;A. Kruss;J. Tegowski;P. Blondel;C. Wiencke;U. Karsten
2007年夏季，在Kongsfjorden（挪威斯瓦尔巴群岛）海岸线周围水深≤5米的几个站和5个不同水深（5、10、15、20、30米）的两个站测量了北极微型底栖植物潜在初级生产力。采用平面光极氧传感器点，在可控光下（约1000 nm），对完整沉积物柱样的上覆水进行了非原位氧交换测定。100 μmol光子m−2 s−1）和温度（2-4°C）条件下。覆盖在水深30米以下的桑迪沉积物上的小块微藻（主要是硅藻）显示出高达317毫克叶绿素a m−2的高生物量。尽管增加水深，没有显着的趋势，在“光合自养活性生物量”（叶绿素a，活/死细胞，细胞大小的比率），因此，在初级生产的测量在两个站。水深≤5至30 m的所有站点都表现出不同的净生产率，从−19至+40 mg O2 m−2 h−1（−168至+360 mg C m−2 day−1），总生产率约为2-62 mg O2 m−2 h−1（17-554 mg C m−2 day−1），这与其他极地和温带地区相当。光合自养生物量和毛/净生产值之间没有关系被发现。Microphytobenthos表现出显着的初级生产率，可与浮游生产的Kongsfjorden，因此，强调作为C源的动物底栖生物的重要性。
During summer 2007, Arctic microphytobenthic potential primary production was measured at several stations around the coastline of Kongsfjorden (Svalbard, Norway) at ≤5 m water depth and at two stations at five different water depths (5, 10, 15, 20, 30 m). Oxygen planar optode sensor spots were used ex situ to determine oxygen exchange in the overlying water of intact sediment cores under controlled light (ca. 100 μmol photons m−2 s−1) and temperature (2–4°C) conditions. Patches of microalgae (mainly diatoms) covering sandy sediments at water depths down to 30 m showed high biomass of up to 317 mg chl a m−2. In spite of increasing water depth, no significant trend in “photoautotrophic active biomass” (chl a, ratio living/dead cells, cell sizes) and, thus, in primary production was measured at both stations. All sites from ≤5 to 30 m water depth exhibited variable rates of net production from −19 to +40 mg O2 m−2 h−1 (−168 to +360 mg C m−2 day−1) and gross production of about 2–62 mg O2 m−2 h−1 (17–554 mg C m−2 day−1), which is comparable to other polar as well as temperate regions. No relation between photoautotrophic biomass and gross/net production values was found. Microphytobenthos demonstrated significant rates of primary production that is comparable to pelagic production of Kongsfjorden and, hence, emphasised the importance as C source for the zoobenthos.