TY  - JOUR
A1  - Grimm, Wendy A.
A1  - Weston, Peter H.
A1  - Manea, Anthony
A1  - Leishman, Michelle R.
T1  - Population size, plant size and reproductive output in key populations of the endangered terrestrial orchid Genoplesium baueri in eastern New South Wales
T2  - Cunninghamia : a journal of plant ecology for eastern Australia
N2  - Genoplesium baueri R.Br. (family Orchidaceae), an endangered terrestrial orchid species endemic to the Sydney Basin, New South Wales, Australia, is known from 13 populations but little is known about its population demographics. To assess the emergent population size, plant size and reproductive output of two key northern Sydney populations, at Ku-ring-gai Chase National Park (KCNP) and Ku-ring-gai Wildflower Garden (KWG), and how these fluctuate through time, intensive field surveys of these populations were carried out over a ten-year period (2009-18). Plants emerged at both sites in every year with a total of 1,249 plant counts made over the 10-year period. From this, we estimate that a total of approximately 500 perennial individuals may exist across both populations, more than previously thought. Although emergent population size did not differ between populations, we found significant differences between the populations in the other measures. The KWG population had taller plants that produced more flowers per plant than the KCNP population, while the plants in the KCNP population had more pollinated flowers and fruit per plant. All of these measures significantly fluctuated through time. This 10-year study has shown that the resilience of key Genoplesium baueri populations is greater than previously thought. However, it has also shown the boom-and-bust nature of emergence, flowering and fruit set in this species, which has highlighted the need for multiyear intensive studies when assessing likely persistence of endangered terrestrial orchid species.
KW  - demographics
KW  - effective fruit-set
KW  - multi-year survey
KW  - plant height
Y1  - 2020
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/58953
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-589533
SN  - 0727- 9620
SN  - 2200 - 405X
VL  - 20
SP  - 259
EP  - 264
ER  -