FN Archimer Export Format
PT J
TI How trophic cascades and photic zone nutrient content interact to generate basin-scale differences in the microbial food web
BT 
AF Thingstad, T Frede
   Browman, Howard
AS 1:1;2:1;
FF 1:;2:;
C1 Department of Biological Sciences, University of Bergen, Bergen, Norway
C2 UNIV BERGEN, NORWAY
IF 3.593
TC 7
UR https://archimer.ifremer.fr/doc/00627/73958/73312.pdf
   https://archimer.ifremer.fr/doc/00627/73958/73313.pdf
LA English
DT Article
CR PROSOPE
BO Thalassa
DE ;Arctic Ocean;bottom-up;Mediterranean Sea;microbial food web;Nansen Legacy;top down;trophic cascades
AB In linear food chains, resource and predator control produce positive and negative correlations, respectively, between biomass at adjacent trophic levels. These simple relationships become more complex in food webs that contain alternative food chains of unequal lengths. We have used a “minimum” model for the microbial part of the pelagic food web that has three such food chains connecting free mineral nutrients to copepods: via diatoms, autotrophic flagellates, and heterotrophic bacteria. Trophic cascades from copepods strongly modulates the balance between the three pathways and, therefore, the functionality of the microbial food web in services such as food production for higher trophic levels, DOM degradation, and ocean carbon sequestration. The result is a theoretical framework able to explain, not only apparent conflicts in Arctic mesocosm experiments, but also biogeochemical features of the Mediterranean. Here, the fundamental difference between Arctic and Mediterranean microbial food webs is the way they are predator driven by seasonal migration of large copepods in the Arctic, but resource driven due to the anti-estuarine circulation in the Mediterranean. In this framework, global change effects on microbial ecosystem functions are more like to come indirectly through changes in these drivers than through direct temperature effects on the microbes. 
PY 2020
PD SEP
SO Ices Journal Of Marine Science
SN 1054-3139
PU Oxford University Press (OUP)
VL 77
IS 5
UT 000582719500005
BP 1639
EP 1647
DI 10.1093/icesjms/fsaa028
ID 73958
ER

EF