Hybridization rate and climate change: are endangered species at risk?
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Many species are altering their geographic range due to climate change creating new sympatric populations of otherwise allopatric populations. We investigated whether climate change will affect the distribution and thus the pattern of hybridization between two pairs of closely related damselfly species [Ischnura damula and I. demorsa, and I. denticollis and I. gemina (this, an endangered species)]. Thus, we estimated the strength of pre and postmating reproductive barriers between both pairs of species, and we predicted future potential distribution under four different Global Circulation Models and a realistic emissions scenario of climate change by using maximum entropy modelling technique. Our results showed that reproductive isolation (RI) is complete in I. damula × I. demorsa individuals: F1 (first generation) hybrids are produced but do not reach sexual maturation. However, RI in I. denticollis × I. gemina hybrids is high but incomplete and unidirectional: only I. gemina females produced F1 hybrids which mate with males and females of I. denticollis and between them producing BC1 (backcrosses) and F2 (second generation) viable hybrids. Maximum entropy models revealed a northern and westward shift and a general reduction of the potential geographic ranges. Based on the pattern of hybridization, for I. damula and I. demorsa there is a current threat as well as a rapid displacement and/or extinction of I. gemina by I. denticollis. However, the current pattern of extinction may not continue due to the contraction in ranges of the four species.
KeywordsClimate change Range shifts Sympatric distributions MAXENT Hybridization and introgression Displacement and extinction
To two anonymous reviewers for their valuable comments and the following colleagues for clarifying and/or providing information about distribution ranges: Rich Bailowitz, Rob Cannings, Doug Danforth, Erland Nielsen, Tim Manolis, Mike May, Dennis Paulson, Leah Ramsay and Tom Schultz. Tania Pollak provided information from her recent survey of Ischnura gemina populations. Raúl Iván Martínez Becerril provided help looking for the literature, and Jesús Ramsés Chavez Ríos for comments on the first draft of this manuscript. This research was funded by two PAPIIT grants (IN 204610 and IN 222312). RSG was supported by a postdoctoral grant (DGAPA-UNAM) from Universidad Nacional Autónoma de México. J.M. is currently supported by grant CGL2012-38624-C02-02 of the Ministry of Economy and Competitiveness of Spain.
Conflict of interest
We confirm that we have no conflict of interests.
- Abbott JC (2007) Ischnura gemina. In: IUCN 2012. IUCN red list of threatened species. Version 2012.1. www.iucnredlist.org
- Bale JSG, Masters J, Hodkinson ID, Awmack C, Bezemer TM, Brown VK, Butterfield J, Buse A, Coulson JC, Farrar J, Good JEG, Harrington R, Hartley S, Jones TH, Lindroth RL, Press MC, Symrnioudis I, Watt AD, Whittaker JB (2002) Herbivory in global climate change research: direct effects of rising temperature on insect herbivores. Glob Chang Biol 8:1–16CrossRefGoogle Scholar
- Córdoba Aguilar A (1993) Population structure in Ischnura denticollis (Burmeister) (Zygoptera: Coenagrionidae). Odonatologica 22:455–464Google Scholar
- Elith J, Graham CH, Anderson RP, Dudík M, Ferrier S, Guisan A, Hijmans RJ, Huettmann F, Leathwick JR, Lehmann A, Li J, Lohmann LG, Loiselle BA, Manion G, Moritz C, Nakamura M, Nakazawa Y, Overton J, Peterson AT, Phillips SJ, Richardson KS, Scachetti-Pereira R, Schapire RE, Soberón J, Williams SA, Wisz MS, Zimmermann NE (2006) Novel methods improve prediction of species’ distributions from occurrence data. Ecography 29:129–152CrossRefGoogle Scholar
- Gullan PJ, Cranston PS (2010) The insects: an outline of entomology, 4th edn. Wiley-Blackwell Science, 565 ppGoogle Scholar
- Hafernik JE (1988) Surveys of potentially threatened Bay area water beetles and the San Francisco forktail damselfly. Unpublished report submitted to the U.S. Fish and Wildlife service, p 32Google Scholar
- IPCC (2007) Summary for policymakers. In: Solomon S, Qin D, Manning M, Chen Z, Marquis M, Averyt KB, Tignor M, Miller HL (eds) Climate change 2007: the physical science basis. Contribution of Working Group I to the fourth assessment report of the intergovernmental panel on climate change. http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-spm.pdf. (Accessed 313 May 2012)
- Johnson C (1975) Polymorphism and natural selection in Ischnura damselflies. Evol Theory 1:81–90Google Scholar
- Kelly B, Whiteley A, Tallmon D (2010) The Arctic melting pot. Nature 468:891Google Scholar
- Leong JM, Hafernik JE (1992) Hybridization between two damselfly species (Odonata: Coenagrionidae): morphometric and genitalic differentiation. Ann Entomol Soc Am 85:662–670Google Scholar
- Moore V (2007) Nuclear genetic analysis of introgression in Ischnura damselflies of California. San Francisco State University, CaliforniaGoogle Scholar
- Ott J (2010) The big trek northwards: recent changes in the European dragonfly fauna. In: Settele J, Penrev L, Georgiev T, Grabaum T, Grobelink V, Hammen V, Klotz S, Kotarac M, Kühn I (eds) Atlas of biodiversity risk. Pensoft Publishers, Sofi a-Moscow, pp 82–83Google Scholar
- Rubidge E, Taylor E (2004) Hybrid zone structure and the potential role of selection in hybridizing populations of native westslope cutthroat trout (Oncorhynchus clarki lewisi) and introduced rainbow trout (O. mykiss). Mol Ecol 12:735–748Google Scholar
- Taylor EB, Boughman JW, Groenenboom M, Sniatynski M, Schluter D, Gow JL (2006) Speciation in reverse: morphological and genetic evidence of the collapse of a three-spined stickleback (Gasterosteus aculeatus) species pair. Evolution 15:343–355Google Scholar
- Tierney M (1996) Experimental hybridization of the damselflies Ischnura gemina and Ischnura denticollis (Odonata: Coenagrionidae). San Francisco State University, San FranciscoGoogle Scholar