INMIBO ( EX - PROPLAME)   14614
INSTITUTO DE MICOLOGIA Y BOTANICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
ABUNDANCE VARIATION OF VOLVOCALES IN RESPONSE TO TEMPERATURE CHANGE
Autor/es:
VANINA GALZENATI; VISITACIÓN CONFORTI; CRISTIAN SOLARI
Lugar:
Tucson
Reunión:
Congreso; First International Volvox Conference; 2011
Institución organizadora:
University of New Brunswick
Resumen:
Temperatures are expected to increase by approximately 2-4.5°C over the next 100 years. Being able to understand the effects of this change on abundance is of high importance. Although physiologists have a well-developed theory for how the intrinsic rate of increase (r) changes with temperature (T), r has little predictive power about outcomes in competitive systems, and most populations do not experience exponential growth; they level off to a carrying capacity (K) or a stochastic equilibrium (N*). In short, the physiological predictions about r do not necessarily translate into predictions about K or N*. As far back as 1934, Gause suggested that N* shows systematic patterns as a function of T, but this has received little follow up work. To increase our scarce knowledge on how abundance responds to temperature we developed microcosm experiments with the volvocine green algae as a model system. We propose to measure in semi-continuous cultures r and N* as a function of T in single species systems, and will extend the experiments to multi-species competitive systems. r and N* was estimated as function of number of cells and chlorophyll content. Preliminary results of Chlamydomonas reinhardtii and Gonium pectorale show that these organisms follow patterns similar to the ones measured by Gause. When analyzing N* vs. r, Gonium shows a strong positive correlation in number of cells, but there is no clear correlation in Chlamydomonas. Volvocales characteristics allow studying differences in size and complexity in response to temperature.