Assessing global range expansion in a cryptic species complex: insights from the red seaweed genus Asparagopsis (Florideophyceae)

Zanolla, Marianela, Altamirano, María, Carmona, Raquel, De la Rosa, Julio, Souza-Egipsy, Virginia, Sherwood, Alison, Tsiamis, Konstantinos, Barbosa, Ana Márcia, Muñoz, Antonio Román, and Andreakis, Nikos (2018) Assessing global range expansion in a cryptic species complex: insights from the red seaweed genus Asparagopsis (Florideophyceae). Journal of Phycology, 54 (1). pp. 12-24.

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Abstract

The mitochondrial genetic diversity, distribution and invasive potential of multiple cryptic operational taxonomic units (OTUs) of the red invasive seaweed Asparagopsis were assessed by studying introduced Mediterranean and Hawaiian populations. Invasive behavior of each Asparagopsis OTU was inferred from phylogeographic reconstructions, past historical demographic dynamics, recent range expansion assessments and future distributional predictions obtained from demographic models. Genealogical networks resolved Asparagopsis gametophytes and tetrasporophytes into four A. taxiformis and one A. armata cryptic OTUs. Falkenbergia isolates of A. taxiformis L3 were recovered for the first time in the western Mediterranean Sea and represent a new introduction for this area. Neutrality statistics supported past range expansion for A. taxiformis L1 and L2 in Hawaii. On the other hand, extreme geographic expansion and an increase in effective population size were found only for A. taxiformis L2 in the western Mediterranean Sea. Distribution models predicted shifts of the climatically suitable areas and population expansion for A. armata L1 and A. taxiformis L1 and L2. Our integrated study confirms a high invasive risk for A. taxiformis L1 and L2 in temperate and tropical areas. Despite the differences in predictions among modelling approaches, a number of regions were identified as zones with high invasion risk for A. taxiformis L2. Since range shifts are likely climate-driven phenomena, future invasive behavior cannot be excluded for the rest of the lineages.

Item ID: 58501
Item Type: Article (Research - C1)
ISSN: 1529-8817
Keywords: Asparagopsis; cryptic; distribution models; Hawaiian Archipelago; invasion risk; Mediterranean Sea; Phylogeography
Copyright Information: © 2017 Phycological Society of America
Funders: U.S. National Science Foundation (NSF), Ministerio de Ciencia e Innovación, Spain (MCI), Consejería de Innovación, Ciencia y Empresa, Junta de Andalucía, Spain (CICEJA), Instituto de Estudios Ceutíes, Spain (IEC), Fundação para a Ciência e a Tecnologia, Portugal (FCT), Consejería de Medio Ambiente y Ordenación del Territorio de la Junta de Andalucía, University of Málaga, Commonwealth Environment Research Facilities (CERF) program
Projects and Grants: NSF Grant Number: DEB‐0542608, MCI Grant Number: CGL2008/01549/BOS, CICEJA Grant Number: P09‐RNM‐5187, IEC Grant Number: 806/5.03.3553, IEC Grant Number:806/5.03.3673, FCT Grant Number: IF/00266/2013
Date Deposited: 04 Jun 2019 03:40
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060701 Phycology (incl Marine Grasses) @ 100%
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