| Autor: |
Paar, Martin, Voronkov, Andrey, Hop, Haakon, Brey, Thomas, Bartsch, Inka, Schwanitz, Max, Wiencke, Christian, Lebreton, Benoit, Asmus, Ragnhild, Asmus, Harald |
| Předmět: |
|
| Zdroj: |
Polar Biology; Nov2016, Vol. 39 Issue 11, p2065-2076, 12p, 1 Chart, 4 Graphs |
| Abstrakt: |
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, while density (4341 ind. m ± 1127 95 % CI) and production (7.0 g C m y ± 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink