Resumen
El monitoreo de fauna silvestre se basa en conteos directos o indirectos de animales o sus rastros, en unidades de muestreo (cámaras, transectos, trampas, redes, grabadores, u otro). Los conteos por unidad o esfuerzo de muestreo se expresan como tasa de encuentro, tasa fotográfica, tasa de captura, etc. Cuando se asume que la tasa está relacionada con el tamaño poblacional, entonces es considerada como un índice de abundancia relativa (IAR). Los cuales son empleados como alternativa a las estimaciones absolutas de la abundancia o densidad. Los IAR son utilizados para monitorear el cambio de una población a través del tiempo, o bien para comparar poblaciones de la misma especie en localidades diferentes. Con el incremento en el uso de las cámaras trampa se ha popularizado el cálculo de los IAR para todas las especies fotografiadas en el área de estudio. Sin embargo, se debe tener precaución con esta interpretación ya que los IAR están sesgados por la detectabilidad que varía entre especies. En este artículo se 1) reviso las definiciones, los supuestos y las limitaciones de los IAR; 2) explica la diferencia conceptual entre los IAR y las tasas de encuentro; 3) enfatiza la importancia de la probabilidad de detección como factor que afecta a los conteos y por ende a las tasas de encuentro; 4) sugiere usar los IAR solo para comparar a la misma especie temporal y espacialmente, mientras que la tasa de encuentro usarla para comparar entre especies; y 5) sugiero algunas alternativas de análisis estadísticos basados en modelos jerárquicos.
Citas
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