[OANNES Foro] Climate change could drive marine food web collapse through altered trophic flows and cyanobacterial proliferation.

[Mario Cabrejos]

 <https://www.ncbi.nlm.nih.gov/pubmed/29315309?dopt=Abstract&holding=npg>
PLoS Biol. 2018 Jan 9;16(1):e2003446. 

doi: 10.1371/journal.pbio.2003446. 

 


Climate change could drive marine food web collapse through altered trophic
flows and cyanobacterial proliferation.


 
<https://www.ncbi.nlm.nih.gov/pubmed/?term=Ullah%20H%5BAuthor%5D&cauthor=tru
e&cauthor_uid=29315309> Ullah H1,
<https://www.ncbi.nlm.nih.gov/pubmed/?term=Nagelkerken%20I%5BAuthor%5D&cauth
or=true&cauthor_uid=29315309> Nagelkerken I1,2,
<https://www.ncbi.nlm.nih.gov/pubmed/?term=Goldenberg%20SU%5BAuthor%5D&cauth
or=true&cauthor_uid=29315309> Goldenberg SU1,
<https://www.ncbi.nlm.nih.gov/pubmed/?term=Fordham%20DA%5BAuthor%5D&cauthor=
true&cauthor_uid=29315309> Fordham DA2.

 


 


Abstract


Global warming and ocean acidification are forecast to exert significant
impacts on marine ecosystems worldwide. However, most of these projections
are based on ecological proxies or experiments on single species or
simplified food webs. How energy fluxes are likely to change in marine food
webs in response to future climates remains unclear, hampering forecasts of
ecosystem functioning. Using a sophisticated mesocosm experiment, we model
energy flows through a species-rich multilevel food web, with live habitats,
natural abiotic variability, and the potential for intra- and
intergenerational adaptation. We show experimentally that the combined
stress of acidification and warming reduced energy flows from the first
trophic level (primary producers and detritus) to the second (herbivores),
and from the second to the third trophic level (carnivores). Warming in
isolation also reduced the energy flow from herbivores to carnivores, the
efficiency of energy transfer from primary producers and detritus to
herbivores and detritivores, and the living biomass of detritivores,
herbivores, and carnivores. Whilst warming and acidification jointly boosted
primary producer biomass through an expansion of cyanobacteria, this biomass
was converted to detritus rather than to biomass at higher trophic
levels-i.e., production was constrained to the base of the food web. In
contrast, ocean acidification affected the food web positively by enhancing
trophic flow from detritus and primary producers to herbivores, and by
increasing the biomass of carnivores. Our results show how future climate
change can potentially weaken marine food webs through reduced energy flow
to higher trophic levels and a shift towards a more detritus-based system,
leading to food web simplification and altered producer-consumer dynamics,
both of which have important implications for the structuring of benthic
communities.

 



---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
------------ próxima parte ------------
Se ha borrado un adjunto en formato HTML...
URL: <http://lista.oannes.org.pe/pipermail/oannes-oannes.org.pe/attachments/20180221/5c8995a0/attachment.html>