Tropical Ecology and Conservation [Monteverde Institute]

Alternative Title

El parasitismo dependiente de la densidad en Centropogon solanifolius (Campanulaceae) y los cambios en la longevidad floral y la fase sexual siguientes a la infestación

Creator

Erik Z Solberg

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Publication Date

May 2007

Abstract

Centropogon solanifolius flowers (Campanulaceae) are parasitized by the fly larvae of Zygothrica neolinea (Drosophilidae). The larvae burrow into the anther of the developing flower bud and eat the pollen, which changes the longevity dynamics among the infested, protandrous flowers. This study investigated whether the flies were parasitizing in a density dependent manner. The study also explored strategies that flowers used to cope with the high infestation rates (!50% in a previous study and documented here as well). To find answers to these questions, 83 flowers were located, their infestation status noted, and nearest neighbor distance measured. Additionally, 78 other flowers were bagged and tagged to look for changes in overall flower lifetime, as well as the longevities of the male and female phases. The results show that group dependence parasitism is operating, with 33% more grouped flowers parasitized (n = 83) ("# = 5.55, df = 1, P < 0.05). Parasitism based on distance to nearest neighbor is also observed (t = 2.261, P = 0.0266). To cope with parasitism and the loss of available pollen in the system, infested flowers shorten their male phase by approximately two days, from 4.2 ± 2.4 to 2.5 ± 2.1 days (t = 2.26, P < 0.21), while experiencing no significant difference in overall flower longevity (t = 0.55, P < 0.59). This results in an implied lengthening of the female phase in infected flowers, increasing the chances of pollination in the pollen-depleted system. Las flores de Centropogon solanifolius (Campanulaceae) son parasitadas por las larvas de la mosca de Zygothrica neolinea (Drosophilidae). Las larvas hacen una madriguera en la antera del botón de la flor y comen el polen, esto cambia la dinámica de la longevidad entre las flores protandras infestadas. Este estudio investigo si las moscas estaban parasitando de una manera dependiente de la densidad de las flores. El estudio exploro también las estrategias que utilizan las flores para hacer frente a los altos valores de infestación (50% en un estudio previo y documentado aquí también).

Keywords

Campanulaceae, Drosophilidae, Flowers, Flores, Costa Rica--Puntarenas--Monteverde Zone, Costa Rica--Puntarenas--Zona de Monteverde, CIEE Spring 2007, CIEE Primavera 2007

Description

Student Affiliation : Department of Biology, University of Wisconsin-Madison Born Digital

Subject: topical

Campanulaceae; Drosophilidae; Flowers; Flores; CIEE Spring 2007; CIEE Primavera 2007

Subject: geographic

Costa Rica--Puntarenas--Monteverde Zone; Costa Rica--Puntarenas--Zona de Monteverde

Genre

Reports

Holding Location

|Monteverde Institute MVI

Identifier

M39-00375

Density-dependent parasitism in Centropogon solanifolius (Campanulaceae) and changes in floral and sex-phase longevity following infestation

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