Methods to estimate the accumulation of degree-days based on maximum and minimum temperaturesare are commonly used to determine relationships or to adjust phenological models based on the "physiological time". Degree-days are obtained indirectly by these methods, this information is not generally available on hourly or shorter time scales due to the type of equipment used to record data or a data loss in historical time series. To compare the performance of such methods, degree-days were estimated with four indirect methods in eight Colombian locations during 1 year. Each indirect method was evaluated in comparison to the numerical integration method by the trapezoidal rule (reference method) using temperatures recorded every 5 min. Based on the percent bias error, the methods proposed by Arnold, Ometto and Snyder tend to overestimate thermal time, whereas the Villa-Nova method underestimates this time, but with a lower performance as regards to the previous ones.

En el presente artículo se reflexiona acerca de las problemáticas ambientales y humanas de la Ciénaga de Mallorquín, con el objetivo primordial de establecer nuevos sentidos y prácticas ambientales que satisfagan las necesidades humanas fundamentales de los habitantes de dicho humedal, generando niveles crecientes de autodependencia y articulación orgánica con la naturaleza y la tecnología, lo que permitirá solucionar muchos de los problemas ambientales y humanos vigentes en dicho ecosistema y su área de influencia.