Abstract Detail



Pteridology

Hay, Nikolai [1], Akinwuntan, Jadesola [2], Cai, Victor [2], McNiece, Elena [2], Windham, Michael [3], Pryer, Kathleen [4].

Reconstructing the origin of the widespread allotetraploid Gymnocarpium dryopteris (Cystopteridaceae) and modeling the impact of future climate change on the species and its diploid progenitors.

The circumboreal/temperate Gymnocarpium dryopteris––one of the most widespread fern species on the planet––is an allotetraploid hybrid. Isozyme and nuclear DNA analyses confirm that the diploid parents are G. appalachianum, which is restricted to cold mountaintops and algific vents in the central and southern Appalachian region of eastern North America, and G. disjunctum, which is currently confined to northwestern North America and Kamchatka. Here, we utilize ecological niche modeling to 1) reconstruct how these highly disjunct species gave rise to G. dryopteris and 2) estimate potential impacts of future climate change on the distribution of all three species. Our study predicts dire fates for the two diploids: very little suitable habitat is posited for G. disjunctum under a variety of climate change models, and G. appalachianum will likely require an urgent contingency plan that includes population relocation to cooler northern locations. The Gymnocarpium dryopteris species complex serves as an excellent case study documenting how three closely related species with radically different range sizes and habitat requirements may be differentially affected by climate change.


1 - Duke University, Biology, Campus Box 90338, Durham, NC, 27708, United States
2 - Duke University, Biology, Campus Box 90338, Durham, NC, 27708, USA
3 - Duke University, Department Of Biology, Box 90338, Durham, NC, 27708, United States
4 - Duke University, Biology, Duke University, Science Drive, Durham, NC, 27708, United States

Keywords:
MaxEnt
Gymnocarpium
climate change
hybridization
conservation.

Presentation Type: Oral Paper
Number: 0006
Abstract ID:996
Candidate for Awards:None


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