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Wildfire alters the structure and seasonal dynamics of nocturnal pollen‐transport networks

Lookup NU author(s): Callum Macgregor, Professor Darren Evans

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley-Blackwell, 2019.

For re-use rights please refer to the publisher's terms and conditions.


Abstract

© 2019 The Authors. Functional Ecology © 2019 British Ecological Society. Wildfires drive global biodiversity patterns and affect plant–pollinator interactions, and are expected to become more frequent and severe under climate change. Post-fire plant communities often have increased floral abundance and diversity, but the effects of wildfires on the ecological process of pollination are poorly understood. Nocturnal moths are globally important pollinators, but no previous study has examined the effects of wildfire on nocturnal pollination interactions. We investigated the effects of wildfire on nocturnal pollen-transport networks. We analysed the abundance and species richness of moths and flowers, and the structure of these networks, at three burned and three unburned sites in Portugal for two years, starting eight months after a large fire. Nocturnal pollen-transport networks had lower complexity and robustness following the fire than at nearby unburned sites. Overall, 70% of individual moths carried pollen, and moths were found to be transporting pollen from 83% of the flower species present. Burned sites had significantly more abundant flowers, but less abundant and species-rich moths. Individual moths transported more pollen in summer at burned sites, but less in winter; however, total pollen transport by the moth assemblage at burned sites was just 20% of that at unburned sites. Interaction turnover between burned and unburned networks was high. Negative effects of fire upon moths will likely permeate to other taxa through loss of mutualisms. Therefore, if wildfires become more frequent under climate change, community resilience may be eroded. Understanding the responses of ecological networks to wildfire can inform management that promotes resilience and facilitates whole-ecosystem conservation.


Publication metadata

Author(s): Banza P, Macgregor CJ, Belo ADF, Fox R, Pocock MJO, Evans DM

Publication type: Article

Publication status: Published

Journal: Functional Ecology

Year: 2019

Volume: 33

Issue: 10

Pages: 1882-1892

Print publication date: 07/10/2019

Online publication date: 11/07/2019

Acceptance date: 10/06/2019

Date deposited: 19/08/2019

ISSN (print): 0269-8463

ISSN (electronic): 1365-2435

Publisher: Wiley-Blackwell

URL: https://doi.org/10.1111/1365-2435.13388

DOI: 10.1111/1365-2435.13388


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