INVESTIGADORES
EZCURRA Cecilia
artículos
Título:
La flora altoandina de los sectores este y oeste del Parque Nacional Nahuel Huapi, Argentina.
Autor/es:
FERREYRA, M.; CLAYTON, S.; EZCURRA, C.
Revista:
DARWINIANA
Editorial:
Instituto Darwinion
Referencias:
Año: 1998 vol. 36 p. 65 - 79
ISSN:
0011-6793
Resumen:
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The floristic composition and species richness of the western
(moister) and eastern (dryer) areas of the High Andean region of
Nahuel Huapi National Park (Argentina) were compared. Species lists
were compiled for the two sectors from collections in the alpine
area of 20 mountains of the Park (10 from each sector) from 1993 to
1997. A total of 232 species, 111 genera and 48 families were
recorded. Asteraceae (with 70 species), Poaceae (17), Apiaceae (12),
Fabaceae (11) and Scrophulariaceae (11) are the predominant families
in the area, and /Senecio /(with 22 species),/ Nassauvia /(12),
/Acaena /(7), and/ Perezia/ (7) are the best represented genera.
There are six endemic species in this protected area. The most
frequent life forms are perennial herbs and subshrubs, followed by
shrubs, and annual species are nearly inexistent. Species richness
was found to increase in relation to the precipitation decrease from
west to east: 149 species were found in the moister western sector
and 220 in the dryer eastern sector. Some families and genera are
more represented or appear exclusively in one of the two sectors. We
discuss current ecological and past historical factors that could
explain this variation in species diversity and composition.
Key words: Southern Andes, High Andean flora, Species richness,
Precipitation gradient.