Continental islands off the Pacific Coast of the Mexican state of Jalisco hold complementary plant conservation value
Victor Hugo Soria-González A , Julieta Benítez-Malvido B , Ireri Suazo-Ortuño C , Juan Martínez Cruz B and Héctor Hugo Siliceo-Cantero
B *
+ Author Affiliations
- Author Affiliations
A Facultad de Biología, Universidad Michoacana de San Nicolás de Hidalgo, Avenida Francisco J. Múgica S/N, Morelia, Michoacán 58030, Mexico.
B Instituto de Investigaciones en Ecosistemas y Sustentabilidad, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro No. 8701, Ex-Hacienda de San José de la Huerta, Morelia, Michoacán 59180, Mexico.
C Instituto de Investigaciones sobre los Recursos Naturales, Universidad Michoacana de San Nicolás Hidalgo, Avenida Juanito Itzicuaro SN, Morelia, Michoacán 58330, Mexico.
Pacific Conservation Biology 29(4) 325-339 https://doi.org/10.1071/PC21070
Submitted: 9 November 2021 Accepted: 3 June 2022 Published: 5 July 2022
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Continental islands are important conservation targets because of their ecological singularities. In the Mexican Pacific, the Chamela Bay Islands Sanctuary in the state of Jalisco is little or not studied at all in terms of biodiversity.
Aims: The aim of this study is to contribute to the management plan of the sanctuary by presenting a detailed analysis of native vegetation surveys of three islands of the sanctuary.
Methods: We used quadrats and treks to record and compare plant diversity, species richness, and structure of woody and cacti vegetation of the islands of Cocinas, La Pajarera, and San Agustín.
Key results: There are 42 woody and seven cacti species on the three islands (Cocinas 28, La Pajarera 17, San Agustín 30), which represent 9% and 42% of the woody and cacti species recorded regionally, respectively. The islands harbour 20 endemic Mexican species (regionally, 8.6% of woody and 30% of cacti species) and four species in some threatened category (regionally, 0.4%). Plant species richness and vegetation structure differ among the three islands, which shared only seven species.
Conclusions: The richness and abundance of woody and cacti species on the three islands (total area: 55.5 ha) that include Mexican endemic and threatened species emphasise the importance of protecting the whole islands.
Implications: The islands need a more active vigilance to avoid induced fires and vegetation removal. Our results point out these factors as the major threats for the islands’ conservation.
Keywords: anthropic activities, Chamela Bay, endemism, habitat structure, insular cacti, insular disturbance, insular vegetation community, woody plants.
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