Abstract Detail

Pteridology

Lau, Priscilla [1], Zhang, Xuening [2], Burleigh, Gordon [3], Huiet, Layne [4], Zenil-Ferguson, Rosana [5], Wood, Ken [6], Rothfels, Carl [7], Tribble, Carrie [8].

Origins of Hawaiian Doryopteris (Pteridaceae).

Doryopteris J. Sm. includes roughly 20 species of cheilanthoid ferns distributed in Central to South America, southern Africa, and Pacific islands. Four species of Doryopteris are endemic to the Hawaiian Islands, including two widespread endemics found across all major islands and two narrow endemics known from small, isolated populations. The two widespread endemics are thought to hybridize, producing Doryopteris x subdecipiens. Origins of these Hawaiian taxa are still unknown. Using a dataset of 316 nuclear loci generated by target enrichment from a sample of 69 individuals of Doryopteris and of sister genera Lytoneuron and Ormopteris, we investigate the evolutionary relationships between the four endemic Hawaiian species of Doryopteris and the status of the putative hybrid. We additionally reconstructed the biogeographic history of Hawaiian Doryopteris to determine if one or multiple dispersal events led to the establishment of the current Hawaiian species. We find that while most Hawaiian Doryopteris are monophyletic, one Hawaiian D. cf. decipiens falls out instead with a clade of broadly-distributed Doryopteris concolor. This pattern suggests that while one dispersal event and subsequent radiation led to the current distribution of most Doryopteris across the Hawaiian islands, a second migration event may have also led to the establishment of previously undescribed diversity in Hawaiian Doryopteris. Furthermore, all Hawaiian species appear nested within the widely-distributed D. concolor, which occurs across the Americas, Pacific islands, and tropical Africa. Our results suggest that taxonomic revisions will be necessary to resolve non-monophyletic species within Doryopteris.

1 - University of California, Berkeley, Integrative Biology, Berkeley, CA, 94720
2 - Cornell University, Department of Ecology and Evolutionary Biology, Ithaca, NY, 14853
3 - Boise State University, Snake River Plains Herbaria, , Boise, Idaho, 83725, USA
4 - Duke University, Department of Biology, Campus Box 90338, Durham, NC, 27708
5 - University of Hawaii at Manoa, School of Life Sciences, 2538 McCarthy Mall, Edmondson Hall 216, Honolulu, HI, 96822
6 - National Tropical Botanical Garden, 3530 Papalina Road, Kalaheo, HI, 96741
7 - University Of California Berkeley, Berkeley, 94720.0, United States
8 - University Of Hawaii At Manoa, Department Of Biology, 2538 McCarthy Mall, Edmondson Hall 216, Honolulu, HI, 96822, United States

Keywords:
island biology
Systematics
Hawaiian Islands
cheilanthoid fern.

Presentation Type: Poster
Session: P3, Pteridology Posters
Location: Virtual/Virtual
Date: Wednesday, July 21st, 2021
Time: 5:00 PM(EDT)
Number: P3PT002
Abstract ID:403
Candidate for Awards:None