Resumen

CALATAYUD, Gloria. Diversidad de la familia Orchidaceae en los bosques montanos de San Ignacio (Cajamarca, Perú). Rev. peru biol. [online]. 2005, vol.12, n.2, pp.309-316. ISSN 1727-9933.

The insufficient information on the flora, specifically on the Orchidaceae family and the imminent destruction of the forests in the Eastern slope of the Chinchipe river (San Ignacio, Cajamarca), were the reasons that motivated to make the present investigation. The evaluation was carried out in four localities of the county San Ignacio (Cajamarca), during year 2000. Sampling was random with 27 quadrants an altitudinal range of 100 m and comprising an area of 500 m² each. Plots were distributed between 800 and 2700 m above sea level. According to the Shannon-Wiener Diversity Index diversity is high in the study area (> grade: Loc. Selva Andina: H' = 5,93 and <grade: Loc. Camaná: H' = 4,02) and this is likely due to the currently good state of conservation of these forests and to the varied topography of the area. The localities of Camaná-Crucero (173,55) have similar indices because they represent similar habitat types. The locality of Selva Andina (969619) shows high altitude endemism (the area reaches elevations of 2700 m) and is thus dissimilar to the group Crucero-Camaná-Nuevo Mundo. In total 205 species distributed in 58 genera are reported. 15 are reported as new records for Peru, eight of these were previously considered as Ecuadorian endemics. The genus Chrysocycnis is reported from Peru for the first time. Two species new to science are reported from the genera Sarcoglottis and Maxillaria.

Palabras clave : Diversity; Endemisms; Habitat; Conservation; Deforestation.

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