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Demography of Conyza bonariensis (Asteraceae) in a ruderal Mediterranean habitat

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Abstract

Conyza bonariensis is an invasive weed of increasing importance in subtropical and warm-temperate regions worldwide, both in non-agricultural habitats and in annual and perennial crops, especially under no-till management. To gain insigths on basic life cycle processes determining the demographic success of C. bonariensis, we studied for this species during two seasons seedling emergence patterns, survival to the adult stage and fecundity in a ruderal Mediterranean habitat in which C. bonariensis was a component of the plant community. The influence of emergence date on survival and fecundity was studied using four successive sowing dates, i.e. cohorts, encompassing the favorable season for plant establishment. The mean rate of seedling emergence was 61%. Emergence patterns were characterized by high initial emergence rates, which were highly dependent on rainfall. The mean rate of survival to the adult stage was 33%. Fecundity reached a mean value of 86,066 achenes and presented density-dependent regulation.. Plant survival and fecundity were positively related to cohort earliness and thus earlier cohorts should preferably be targeted for an effective management of C. bonariensis.

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Acknowledgements

This work was supported by grant AGL2009-7883 of the FEDER (European Regional Development Funds) and of the Spanish Ministry of Economy and Competitiveness (MINECO). CZ-N acknowledges a scholar grant from CDCH-UCV (Council of Scientific and Humanistic-Central University of Venezuela).

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Authors and Affiliations

  1. Institute for Sustainable Agriculture (CSIC), Avda. Menendez Pidal s/n, 14004, Córdoba, Spain

    Castor Zambrano-Navea & Jose L. Gonzalez-Andujar

  2. Institute of Agronomy and Botany, Faculty of Agronomy, Central University of Venezuela, Maracay, Venezuela

    Castor Zambrano-Navea

  3. Department of Agroforestry Sciences, Campus La Rábida, University of Huelva, Palos de la Frontera, Huelva, Spain

    Fernando Bastida

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  1. Castor Zambrano-Navea
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Correspondence to Jose L. Gonzalez-Andujar.

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Zambrano-Navea, C., Bastida, F. & Gonzalez-Andujar, J.L. Demography of Conyza bonariensis (Asteraceae) in a ruderal Mediterranean habitat. Phytoparasitica 46, 263–272 (2018). https://doi.org/10.1007/s12600-018-0647-9

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