TY  - JOUR
A1  - Wheeler, Margaret A.
T1  - Comparing reproductive success in the rare sedge Gahnia insignis and the common Gahnia clarkei in north-east New South Wales
T2  - Cunninghamia : a journal of plant ecology for eastern Australia
N2  - Species may become vulnerable because of a reduction of habitat, leading to reduction of population sizes and an increase in geographic isolation between populations, leading to genetic drift that may result in reduced reproductive fitness. The restricted sedge Gahnia insignis S.T. Blake (family Cyperaceae), occurring in isolated pockets in north-east New South Wales and Queensland, was compared to a closely related, sympatric, common and widespread Gahnia clarkei Benl for flowering phenology and reproductive success. Flowering patterns, examination of pollen, fertilisation and embryo development and seed-ovule ratios show Gahnia clarkei has every indication of successful sexual reproduction, but that Gahnia insignis appears to reproduce mostly by vegetative means, with an occasional sexual event. This was due to the rarity of pollination opportunities, and to poor pollen viability and pollen quantity, resulting in a much lower seed-ovule ratio than Gahnia clarkei. The additional high level of vegetative reproduction in Gahnia insignis suggests it may be largely clonal in Nightcap National Park. A genetic study of the whole distribution would add knowledge of the species genetic diversity and differentiation between populations.
Y1  - 2012
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/29611
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-296116
SN  - 2200-405X
SN  - 0727-9620
VL  - 12
IS  - 4
SP  - 385
EP  - 388
PB  - Mount Annan Botanic Garden, The Administration Officer
CY  - Mount Annan, NSW
ER  -