Version 1
: Received: 16 May 2024 / Approved: 16 May 2024 / Online: 17 May 2024 (08:01:24 CEST)
How to cite:
Sánchez-García, R.; Green, A. J.; Tomasson, L.; Hortas, F.; Ortiz, M. A. Invasive Buttonweed Cotula coronopifolia (Asteraceae) Is Halotolerant and Has High Potential for Dispersal by Endozoochory. Preprints2024, 2024051121. https://doi.org/10.20944/preprints202405.1121.v1
Sánchez-García, R.; Green, A. J.; Tomasson, L.; Hortas, F.; Ortiz, M. A. Invasive Buttonweed Cotula coronopifolia (Asteraceae) Is Halotolerant and Has High Potential for Dispersal by Endozoochory. Preprints 2024, 2024051121. https://doi.org/10.20944/preprints202405.1121.v1
Sánchez-García, R.; Green, A. J.; Tomasson, L.; Hortas, F.; Ortiz, M. A. Invasive Buttonweed Cotula coronopifolia (Asteraceae) Is Halotolerant and Has High Potential for Dispersal by Endozoochory. Preprints2024, 2024051121. https://doi.org/10.20944/preprints202405.1121.v1
APA Style
Sánchez-García, R., Green, A. J., Tomasson, L., Hortas, F., & Ortiz, M. A. (2024). Invasive Buttonweed Cotula coronopifolia (Asteraceae) Is Halotolerant and Has High Potential for Dispersal by Endozoochory. Preprints. https://doi.org/10.20944/preprints202405.1121.v1
Chicago/Turabian Style
Sánchez-García, R., Francisco Hortas and Maria A. Ortiz. 2024 "Invasive Buttonweed Cotula coronopifolia (Asteraceae) Is Halotolerant and Has High Potential for Dispersal by Endozoochory" Preprints. https://doi.org/10.20944/preprints202405.1121.v1
Abstract
Buttonweed (Cotula coronopifolia) is native to South Africa but invasive in wetlands in Europe, North America, and Australasia, where it excludes native plants. Despite being dry-fruited, field studies suggest migratory waterbirds can disperse its seeds via gut passage (endozoochory), aiding its expansion. To explore the potential for endozoochory in different regions and habitats, we collected seeds from six populations in Spain, Sweden, and the UK. Germination was tested under different salinity levels (0, 5, 10, 15 g/L) and simulated gut passage treatments: scarification, acidification, or both. No germination occurred at 15 g/L. Higher salinity reduced and delayed germination, but full gut passage treatment increased germinability and accelerated germination. Scarification or acid treatment alone resulted in intermediate germination patterns. There were significant salinity x population and gut passage x population interactions on germinability. The acceleration effect of gut passage on germination was stronger at 5-10 g/L than at 0 g/L. This study highlights how migratory birds can facilitate the spread of alien plants introduced by humans. Non-classical endozoochory by waterbirds is an understudied mechanism for the long-distance dispersal of dry-fruited alien plants. Further research on C. coronopifolia, including population genetics, is necessary to understand dispersal mechanisms and facilitate management strategies.
Keywords
endozoochory; dry-fruited seeds; dispersal syndromes; salinity; gut passage; non-indigenous species
Subject
Biology and Life Sciences, Ecology, Evolution, Behavior and Systematics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
