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Nutrient addition extends flowering display, which gets tracked by seed predators, but not by their parasitoids
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik. Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC).ORCID-id: 0000-0002-9337-4540
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
2008 (engelsk)Inngår i: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 117, s. 473-480Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Although phenological matching between two and three trophic interactions has received some attention, it has largely been disregarded in explaining the lack of strong cascade dynamics in terrestrial systems. We studied the response of the specialist seed predator, Paroxyna plantaginis (Tephritidae) and associated generalist parasitoids (Chalcidoidea) to controlled fertilisation of individuals of naturally growing Tripolium vulgare (Asteraceae) on four island populations (Skeppsvik Archipelago, Sweden). We consistently found evidence of nutrient limitation: fertilised plants increased their biomass, produced more capitula (the oviposition units for tephritid flies), were more at risk of attack by the tephritids, and puparia were heavier in fertilised plants. During some parts of the season tephritids became more heavily parasitized, supporting the presence of cascade dynamics, however net parasitism over season decreased in response to nutrient addition. We found no evidence that capitulum size complicated parasitoid access to the tephritids, however the extended bud production prolonged the flowering season. Thus, tephritids utilized the surplus production of capitula throughout the entire season, while parasitoids did not expand their oviposition time window accordingly. Implications for top down regulation and cascade dynamics in the system are discussed.

sted, utgiver, år, opplag, sider
Wiley-Blackwell, 2008. Vol. 117, s. 473-480
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URN: urn:nbn:se:umu:diva-9501DOI: 10.1111/j.2008.0030-1299.16381.xISI: 000253634100019OAI: oai:DiVA.org:umu-9501DiVA, id: diva2:149172
Tilgjengelig fra: 2008-09-11 Laget: 2008-09-11 Sist oppdatert: 2019-08-07bibliografisk kontrollert

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