期刊
POLAR BIOLOGY
卷 39, 期 11, 页码 2065-2076出版社
SPRINGER
DOI: 10.1007/s00300-015-1760-6
关键词
Arctic; Macrozoobenthic; Kelp/associated fauna; Benthic biomass; Somatic production; P/B ratio; Kongsfjorden
资金
- International Arctic Environmental Research and Monitoring Facility at Ny-Alesund, Spitsbergen, Norway [KOL 06]
In Arctic macroalgal belt ecosystems, macrozoobenthic production is thought to be an important link between primary production and higher trophic levels. Macrozoobenthic biomass and secondary production were studied along transects (2.5-15 m depth) in the macroalgal belt at Hansneset in Kongsfjorden, Svalbard, from 2012 to 2013. At 2.5 m, the standing stock reached its maxima of 174.8 +/- 54.4 g ash-free dry weight per 1 m(2), while density (4341 ind. m(-2) +/- 1127 95 % CI) and production (7.0 g C m(-2) y(-1) +/- 2.8 95 % CI) were highest at 5 m water depth in 2012/13. Compared to a study from 1996/98, this re-sampling indicated a drastic change in the depth distribution of macrozoobenthic biomass and secondary production at Hansneset. While both biomass and secondary production increased with water depth in 1996/98, this pattern was inversed in 2012/13 owing to a tenfold increase in biomass and secondary production in the upper most sublittoral (2.5-5 m). Variability of macrozoobenthic biomass and secondary production corresponded to differences in the physical environment and macroalgal vegetation along the depth gradient. In the last decade, the number of ice-free days per year increased probably due to Arctic warming. As a result, shallow rocky habitats (2.5-5 m) are less affected by ice scouring, thereby opening new space for colonisation by benthic fauna. However, faunal secondary production was low compared to macroalgal primary production, indicating a considerable export of most of the algal production from the shallow habitats to the adjacent areas.
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