%0 Journal Article
%T Do pollinators respond in a dose-dependent manner to flower herbivory?: An experimental assessment in Loasa tricolor (Loasaceae)  Responden los polinizadores en forma dosis-dependiente a la herbivor赤a floral?: Una evaluaci車n experimental en Loasa tricolor (Loasaceae)
%A ROXANA CARES-SU芍REZ
%A TOM芍S POCH
%A ROMINA F ACEVEDO
%A IGNACIO ACOSTA-BRAVO
%J Gayana. Botanica
%D 2011
%I Universidad de Concepci車n
%X Pollinators are able to discriminate among different floral phenotypes. Thus, flowers more attractive to pollinators usually receive more visits to their reproductive structures. However, this effect of attraction does not necessarily occur in a binary way, all-or-nothing. Loasa tricolor KerGawl. is an annual herb covered with stinging hairs. Flowers present a corolla with five yellow petals and red nectarine scales. In this study, we assess whether the variation in the floral phenotype of L. tricolor affects discrimination by pollinators, following a dose-dependent type of response. This study was carried out in a protected area of Chile where L. tricolor shows high levels of florivory, probably affecting its attraction to pollinators. We experimentally modified the corolla phenotype, removing three or all petals. We measured visitation rate, richness and diversity of pollinator species in treated and control flowers. Results show that three-petal-removal did not reduce the visitation rate compared to control, while complete-petal-removal significantly reduced the visitation rate. Most pollinator species were recorded in the three-petal-removal treatment (nine species), while complete-petal-removal treatment obtained the lowest richness value (four species). These results suggest that species diversity, richness and visitation rates are affected by flower phenotype variation, but probably for complete petal loss only. We suggest that different levels of florivory on L. tricolor do not affect pollinator discrimination in a dose-dependent way. Los polinizadores son capaces de discriminar entre diferentes fenotipos florales. Por lo tanto, flores m芍s atractivas para los polinizadores usualmente reciben m芍s visitas a sus estructuras reproductivas. Sin embargo, este efecto de atracci車n no ocurre necesariamente de una forma binaria, todo o nada. Loasa tricolor KerGawl. es una hierba anual cubierta con pelos urticantes. Sus flores presentan una corola con cinco p谷talos amarillos y escamas nectarinas rojas. En este estudio, evaluamos si la variaci車n en el fenotipo floral de L. tricolor afecta la discriminaci車n por polinizadores, siguiendo una respuesta de tipo dosis-dependiente. Este estudio fue llevado a cabo en un 芍rea protegida de Chile donde L. tricolor muestra altos niveles de herbivor赤a floral, probablemente afectando su atracci車n hacia los polinizadores. Modificamos experimentalmente el fenotipo de la corola, removiendo tres o todos sus p谷talos. Medimos la tasa de visita, riqueza y diversidad de especies de polinizadores en las flores tratadas y control.
%K Herbivor赤a floral
%K polinizaci車n
%K tasa de visita
%K florivor赤a
%K Flower herbivory
%K pollination
%K visitation rate
%K florivory
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200007