INVESTIGADORES
FERREYRA Gustavo Adolfo
artículos
Título:
Mathematical models for UVR effects in marine communities
Autor/es:
MOMO, F., E. FERRERO, M. EÖRY, M. ESUSY, J. IRIBARREN, G. A. FERREYRA, I. SCHLOSS AND S. DEMERS
Revista:
PHOTOCHEMISTRY AND PHOTOBIOLOGY
Editorial:
American Society for Photobiology
Referencias:
Año: 2006 vol. 82 p. 903 - 908
ISSN:
0031-8655
Resumen:
The effect of UVB radiation (UVBR, 290320 nm) on the
dynamics of the lower levels of the marine plankton community
was modeled. The model was built using differential
equations and shows a good fit to experimental data collected
in mesocosms (defined as large enclosures of 1500 L filled with
natural marine waters). Some unexpected results appear to be
possible by indirect effects in prey (bacteria, phytoplankton
and heterotrophic flagellates). In particular, apparent competition
appears between small phytoplankton and bacteria.
This effect is caused by a shared predator (ciliates). Another
remarkable effect is an increase in bacteria and flagellates
populations due to enhanced UVBR. This effect is similar to
that observed under mesocosm experimental conditions and is
related to the decrease of predation due to the direct damage
to predators (ciliates) by UVBR. The effect of UVBR changing
interaction coefficients may be dramatic on the community
structure, producing big changes in equilibrium populations,
as demonstrated by sensitivity analysis of the model. In order
to generalize these results to field conditions it will be necessary
to increase model complexity and include extra organic
mater sources, mixing and sinking effects and predation by
large zooplankton. This work shows that UVBR may produce
community global responses that are consequence of both
direct and indirect effects among populations.