The relationship of meteorological patterns with changes in floristic richness along a large elevational gradient in a seasonally dry region of southern Mexico

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• 作者：Silvia H. Salas-Morales ; Jorge A. Meave…
• 关键词：Air humidity ; Air temperature ; Critical temperature ; Floristic richness ; Floristic composition ; Hourly climatic analysis ; Thermal oscillation
• 刊名：International Journal of Biometeorology
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：59
• 期：12
• 页码：1861-1874
• 全文大小：1,222 KB
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• 作者单位：Silvia H. Salas-Morales (1) (2)
  Jorge A. Meave (2)
  Irma Trejo (3)
  
  1. Sociedad para el Estudio de los Recursos Bióticos de Oaxaca, A.C., Camino Nacional No. 80-b, San Sebastián Tutla, Oaxaca, 71246, Mexico
  2. Departamento de Ecología y Recursos Naturales, Facultad de Ciencias, Universidad Nacional Autónoma de México, México, 04510, DF, Mexico
  3. Departamento de Geografía Física, Instituto de Geografía, Universidad Nacional Autónoma de México, México, 04510, DF, Mexico
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Animal Physiology
  Plant Physiology
  Environmental Medicine/Environmental Psychology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1254

文摘

Globally, climate is a fundamental driver of plant species-geographical distributions, yet we still lack a good understanding of climatic variation on tropical mountains and its consequences for elevational floristic patterns. In a seasonally dry region of southern Mexico, we analysed meteorological patterns along a large elevational gradient (0-670 m a.s.l.) and examined their relationship with changes in floristic richness. Meteorological patterns were characterised using two data sources. First, climatic information was extracted from cartography and records from a few existing meteorological stations. Additionally, air temperature and humidity were recorded hourly during 1 year with data loggers, at sites representing 200-m elevation increments. Floristic information was extracted from a database containing 10,124 records of plant collections, and organized in 200-m elevational belts. Climatic charts distinguished three climate types along the gradient, all with marked rainfall seasonality, but these bore little correspondence with the information obtained with the data loggers. Mean annual air temperature decreased with increasing elevation (lapse rate of 0.542 °C 100 m?). Thermal oscillation was minimum around 1400 m and increased towards both extremes of the gradient. Relative humidity opposed this pattern, with maxima between 800 and 1800 m, decreasing towards the highest elevations. An analysis of temperature frequency distributions revealed meteorological features undetectable from the annual or monthly means of this variable; despite an overall gradual transition of the proportions of time recorded at different temperatures, some changes did not conform to this pattern. The first discontinuity occurred between 1000-200 m, where dominant temperatures shifted abruptly; also noticeable was an abrupt increase of the proportion of time elapsed at 0.1-0 °C between 2400 and 2600 m. Air temperature appears to be the most influential climatic factor driving elevational variation of plant species richness in this region. Keywords Air humidity Air temperature Critical temperature Floristic richness Floristic composition Hourly climatic analysis Thermal oscillation