Abstract
Inherent characteristics of island species make them particularly susceptible to anthropogenic changes and need to be assessed to implement appropriate conservation strategies. The impacts of climate change are increasingly being investigated along elevational gradients since they provide natural laboratories to study how species respond to climatic variation. Ferns are particularly sensitive to air humidity and temperature and are therefore potentially useful as bio-indicators. This study addresses the question of whether the distributions of fern species richness and abundance have climatic correlates along an elevational gradient on the tropical volcanic island of Tahiti (French Polynesia). Analyses were conducted on two datasets: island-wide richness was estimated using published data on species elevational ranges, and local richness and abundance were addressed through a transect survey. Correlations with water availability, temperature, area availability, and a randomly-generated species richness pattern were investigated. Results showed that both diversity and abundance varied in association with climate. Rainfall was collinear with diversity in the lower half of the elevational gradient (R2 = 0.97), while temperature was the most important climatic correlate for diversity in the upper half (R2 = 0.98). The number of terrestrial fern individuals and epiphytic fern cover were both correlated with temperature (R2 = 0.86 and 0.81, respectively). Our results imply that impacts of climate change on ferns on Tahiti might include change in diversity and abundance, and increased extinction risk due to low overlap between current and projected species distributions. Ferns represent important indicator organisms that can be used to study species distributional responses to climate change in island ecosystems.
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References
Arrhenius O (1921) Species and area. J Ecol 9:95–99
Benzing DH (1998) Vulnerabilities of tropical forests to climate change: the significance of resident epiphytes. Clim Chang 39:519–540
Bhattarai KR et al. (2004) Fern species richness along a central Himalayan elevational gradient, Nepal. J Biogeogr 31:389–400
Caujapé-Castells J et al. (2010) Conservation of oceanic island floras: present and future global challenges. Perspect Plant Ecol Evol System 12:107–129
Colwell RK (2008) RangeModel: tools for exploring and assessing geometric constraints on species richness (the mid-domain effect) along transects. Ecography 31:4–7
Dunn RR et al. (2007) When does diversity fit null model predictions? Scale and range size mediate the mid-domain effect. Global Ecol Biogeogr 16:305–312
Florence J (1993) La végétation de quelques îles de Polynésie. In: Dupon Z, Bonvallot J, Vigneron E (eds) Atlas de la Polynésie française. ORSTOM, Paris, plates, pp. 54–55
Florence J (2016) Flore de la Polynésie française. Volume 3: fougères et alliées. IRD Editions, (in press)
Fordham DA, Brook BW (2010) Why tropical island endemics are acutely susceptible to global change. Biodivers Conserv 19:329–342
Fortini LB et al. (2013) A landscape-based assessment of climate change vulnerability for all native Hawaiian plants. Technical Report 044, Hawai’i Cooperative Studies Unit. University of Hawai’i, Hilo.
Grytnes J-A, McCain CM (2007) Elevational trends in biodiversity. In: Levin S (ed) Encyclopedia of biodiversity. Elsevier, Amsterdam, pp. 1–8
Harter DEV et al. (2015) Impacts of global climate change on the floras of oceanic islands: projections, implications and current knowledge. Perspect Plant Ecol Evol System 17:160–183
Hemp A (2001) Ecology of the pteridophytes on the southern slopes of Mt. Kilimanjaro Part II: habitat selection. Plant Biol 3:493–523
Hsu RC-C et al. (2012) Simulating climate change impacts on forests and associated vascular epiphytes in a subtropical island of East Asia. Divers Distrib 18:334–347
Hsu RC-C et al. (2014a) Adaptation of a widespread epiphytic fern to simulated climate change conditions. Plant Ecol 215:889–897
Hsu RC-C et al. (2014b) Regional and elevational patterns in vascular epiphyte richness on an east Asian island. Biotropica 46:549–555
Karger DN et al. (2011) The effect of area on local and regional elevational patterns of species richness. J Biogeogr 38:1177–1185
Karger DN et al. (2012) Bryophyte cover on trees as proxy for air humidity in the tropics. Ecol Indic 20:277–281
Karger DN et al. (2014) Island biogeography from regional to local scales: evidence for a spatially scaled echo pattern of fern diversity in the southeast Asian archipelago. J Biogeogr 41:250–260
Kessler M et al. (2011) A global comparative analysis of elevational species richness patterns of ferns. Glob Ecol Biogeogr 20:868–880
Kessler M et al. (2014) Species richness–productivity relationships of tropical terrestrial ferns at regional and local scales. J Ecol 102:1623–1633
Kier G et al. (2009) A global assessment of endemism and species richness across island and mainland regions. Proc Natl Acad Sci 106:9322–9327
Kluge J et al. (2006) What drives elevational patterns of diversity? A test of geometric constraints, climate and species pool effects for pteridophytes on an elevational gradient in Costa Rica. Glob Ecol Biogeogr 15:358–371
Krömer T et al. (2005) Diversity patterns of vascular epiphytes along an elevational gradient in the Andes. J Biogeogr 32:1799–1809
Krushelnycky PD et al. (2013) Climate-associated population declines reverse recovery and threaten future of an iconic high-elevation plant. Glob Chang Biol 19:911–922
Laurent V et al. (2004) Atlas climatologique de la Polynésie française. Météo-France - Direction interrégionale de Polynésie française, Papeete
Lloret F, González-Mancebo JM (2011) Altitudinal distribution patterns of bryophytes in the Canary Islands and vulnerability to climate change. Flora 206:769–781
Loope LL (1995) Climate change and island biological diversity. In: Vitousek PM, Loope LL, Adsersen H (eds) Islands: biological diversity and ecosystem function. Springer, Berlin, pp. 123–132
Loope LL, Giambelluca TW (1998) Vulnerability of island tropical montane cloud forests to climate change, with special reference to east Maui, Hawaii. Clim Change 39:503–517
McCain CM (2007) Area and mammalian elevational diversity. Ecology 88:76–86
Meyer J-Y (2010) Montane cloud forests on remote islands of Oceania: the example of French Polynesia (South Pacific Ocean). In: Bruijnzeel LA, Scatena FN, Hamilton LS (eds) Tropical montane cloud forests: science for conservation and management. Cambridge University Press, Cambridge, pp. 121–129
Meyer J-Y (2013) A note on the taxonomy, ecology, distribution and conservation status of the ferns (pteridophytes) of Rapa Nui (Eastern Island). Rapa Nui J 27:71–83
Pouteau R et al. (2010) La fonte de la biodiversité dans les îles tropicales: modélisation de l’impact potentiel du réchauffement global Sur la végétation orophile de Tahiti (Polynésie française). VertigO 10
Proctor GR (1989) Ferns of Puerto Rico and the Virgin Islands. Mem N Y Bot Gard 53:1–389
Rahbek C (2005) The role of spatial scale and the perception of large-scale species-richness patterns. Ecol Lett 8:224–239
Renwick KM, Rocca ME (2015) Temporal context affects the observed rate of climate-driven range shifts in tree species. Glob Ecol Biogeogr 24:44–51
Ricklefs RE (1987) Community diversity – relative roles of local and regional processes. Science 235:167–171
Romdal TS, Grytnes JA (2007) An indirect area effect on elevational species richness patterns. Ecography 30:440–448
Smith AR (1972) Comparison of fern and flowering plant distributions with some evolutionary interpretations for ferns. Biotropica 1:4–9
Tryon R (1970) Development and evolution of fern floras of oceanic islands. Biotropica 2:76–84
Vernon AL, Ranker TA (2013) Current status of the ferns and lycophytes of the Hawaiian islands. Am Fern J 103:59–111
Wiens JA et al. (2009) Niches, models, and climate change: assessing the assumptions and uncertainties. Proc Natl Acad Sci 106:19644–19650
Williams JW, Jackson ST (2007) Novel climates, no-analog communities, and ecological surprises. Front Ecol Environ 5:475–482
Zotz G, Bader M (2009) Epiphytes in a changing world: global change effects on vascular and non-vascular epiphytes. Prog Bot 70:47–70
Acknowledgments
We are grateful to Jacques Florence (MNHN, Paris) for providing data on ferns in Tahiti, and three anonymous referees for their insightful comments. This work was supported by the “Moveclim” (MOntane VEgetation as listening posts for CLIMate change) project funded by the Net-Biome research program for the Outermost Regions and Territories of Europe and by the French National Research Agency (ANR).
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Pouteau, R., Meyer, JY., Blanchard, P. et al. Fern species richness and abundance are indicators of climate change on high-elevation islands: evidence from an elevational gradient on Tahiti (French Polynesia). Climatic Change 138, 143–156 (2016). https://doi.org/10.1007/s10584-016-1734-x
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DOI: https://doi.org/10.1007/s10584-016-1734-x