INVESTIGADORES
SERSIC Alicia Noemi
artículos
Título:
Natural hybridization between species of Calceolaria with different pollination syndromes in southern Patagonia, Argentina
Autor/es:
SÉRSIC, ALICIA N.; MERCEDES MASCÓ,; IMANUEL NOYMEIR,
Revista:
PLANT SYSTEMATICS AND EVOLUTION
Editorial:
SPRINGER WIEN
Referencias:
Año: 2001 vol. 230 p. 111 - 124
ISSN:
0378-2697
Resumen:
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Abstract
Calceolaria
uniflora and C. polyrhiza differ markedly in flower structure, color, and in
their pollination mechanisms. Flowers of C. polyrhiza have a hidden glandular oil-secreting appendage that
in the genus typically attracts bee pollinators, while in C. uniflora this is replaced by an external, white and fleshy
structure that functions as food body
and attracts a bird pollinator. Populations with intermediate flower
morphology, presumably hybrids, were found in several sites over a large area
of southern Patagonia, Argentina. The intermediate forms
have so far been found always in contact or close proximity with typical
populations of both presumed parent species. The distribution pattern and
phenetic intermediacy in several independent flower characters strongly suggest
widespread interspecific hybridization in the range of geographic overlap of
the two species. The pattern of
variation of intermediate forms in some sites is indicative of a hybrid swarm
and possible introgression. Of particular interest is the range of intermediate
structures and positions of the flower appendage, between oil gland and food
tissue, that can be found in hybrid populations. The observed phenomenon raises several
questions concerning the biological mechanisms generating it and its
evolutionary consequences.