Climatic effects on population declines of a rare wetland species and the role of spatial and temporal isolation as barriers to hybridization

摘要: Summary 1.Climate change and climatic extremes may affect species directly or indirectly. While direct effects have been intensively studied, indirect effects, such as increasing hybridization risk, are poorly understood. 2.The goal of our study was to analyze the impact climate on population dynamics a rare habitat specialist, Chorthippus montanus, well fine-scale spatial overlap with sympatric generalist, parallelus dispersion hybrids. We were particularly interested in role spatiotemporal heterospecific encounter frequencies. 3.We conducted high-precision mark-recapture studies two sites over seven years genotyped 702 individuals Ch. montanus generations detect tested performance three programs (STRUCTURE, NewHybrids, adegenet) accepted only hybrids detected by best performing programs. then for correlations between yearly trends variables. Furthermore, we analyzed both taxa calculate variation temporal infer probabilities. 4.Our results revealed that droughts during egg phase rainy weather nymphal development strongly correlated declines specialist. The highest rate (19.6%) found lowest size. combined niche decreased probabilities 4.2-7.6% compared 20-28% 11-19% calculated alone from phenology overlap, respectively. Hybrids areas higher probability, mainly at edge specialists’ occupied intermediate soil moisture conditions parental species. 5.This illustrates combination segregation provides an effective barrier hybridization. However, high one populations suggests this function decrease decreasing This supports hypothesis threaten reducing reproductive success indirectly increase risk. This article is protected copyright. All rights reserved.