Abstract
Species circumscription based on phenotypes has frequently masked the actual species diversity in foliose Bangiales. Application of DNA sequence differences in this group has removed dependence on the utility of morphological characters traditionally considered for species discrimination. This study currently represents an extensive analysis of phylogeny and species discrimination of foliose Bangiales across most of their distributional range in the northern Philippines, particularly in Luzon Strait. Molecular assessment based on plastid rbcL and two mitochondrial loci, COI-5P, and cox2–3 spacer, suggested four major groups diagnostic of species lineage. As supported by the results from the four molecular species delimitation methods: PTP, bPTP, ABGD, and SPN, the confirmed Philippine foliose Bangiales species included Pyropia acanthophora, Py. tanegashimensis, and two cryptic taxa from Batanes Islands. The number of species detected in this study suggested that the true species composition of Philippine foliose Bangiales might be considerably lower than what was previously thought. It is possible however that a greater sampling effort in complete seasonal range of collections will reveal more species and extent of their actual distributions. Although the influence of northeast monsoon significantly affects the growth of foliose Bangiales in the Philippines, its role in shaping their present-day distribution remains unclear. Our molecular datasets however suggested that their current biogeographic distribution might reflect past vicariant events and is therefore more complex than have been previously regarded.
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Acknowledgements
Funding for this study was provided by the Philippine Council for Agriculture, Aquatic and Natural Resources Research and Development (DOST-PCAARRD) Science Education Institute through an Accelerated Science and Technology Human Resources Development Program (DOST-SEI ASTHRDP), and by the Far Eastern University, University Research Center (FEU-URC). Additional grant was given by the International Association of Plant Taxonomy (IAPT) Research Grants Program in Plant Systematics to RVD. The authors wish to thank Z. Z. A. Aguinaldo for laboratory assistance and to S. L. Yap, I. K. C. Fontanilla, E. P. Cao, and P. G. Vital for their valuable comments on the first draft of the manuscript. Thanks also go to C.B. Mintu, R. D., M. P. Quinto, Olipany, E. C. Ame, R. C. Andres, J. Calaoagan, C. Abiva, Z. A. Albindo, M. Figuro, S. Castillo, R. Rivera, and M. C. Morales for their kind assistance during sample collection.
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Dumilag, R.V., Monotilla, W.D. Molecular diversity and biogeography of Philippine foliose Bangiales (Rhodophyta). J Appl Phycol 30, 173–186 (2018). https://doi.org/10.1007/s10811-017-1201-8
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DOI: https://doi.org/10.1007/s10811-017-1201-8