INVESTIGADORES
AIZEN Marcelo Adrian
artículos
Título:
Floral adaptation and diversification under pollen limitation
Autor/es:
HARDER, L.D, AIZEN, M.A.
Revista:
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Editorial:
ROYAL SOC
Referencias:
Lugar: Londres; Año: 2010 vol. 365 p. 529 - 543
ISSN:
0962-8436
Resumen:
Pollen limitation (PL) of seed production creates unique conditions for reproductive adaptation by
angiosperms, in part because, unlike under ovule or resource limitation, floral interactions with
pollen vectors can contribute to variation in female success. Although the ecological and conservation
consequences of PL have received considerable attention in recent times, its evolutionary
implications are poorly appreciated. To identify general influences of PL on reproductive adaptation
compared with those under other seed-production limits and their implications for
evolution in altered environments, we derive a model that incorporates pollination and postpollination
aspects of PL. Because PL always favours increased ovule fertilization, even when
population dynamics are not seed limited, it should pervasively influence selection on reproductive
traits. Significantly, under PL the intensity of inbreeding does not determine whether outcrossing
or autonomous selfing can evolve, although it can affect which response is most likely. Because the
causes of PL are multifaceted in both natural and anthropogenically altered environments,
the possible outcrossing solutions are diverse and context dependent, which may contribute to
the extensive variety of angiosperm reproductive characteristics. Finally, the increased adaptive
options available under