Journal Article Research Support, Non-U.S. Gov't Living Planet Index Research Support, U.S. Gov't, Non-P.H.S. Review aves de humedal biodiversity data biodiversity indicators biodiversity surveillance biodiversity trends causal inference ciencia ciudadana citizen science conservación de humedales conservation effectiveness data deficiency efectividad de la conservación evaluación de impacto global biodiversity monitoring impact evaluation indicator accuracy indicator reliability indicator testing inferencia causal megadiverse countries países megadiversos population trends sesgo taxonómico taxonomic bias tendencias poblacionales