Report on the Macquarie Island Collection
held in the ANBG seedroom (Nursery) and in the ANU Botany Dept.
(Faculties) growth cabinets.
Barrie Hadlow (email@example.com)
When received in November 1989, this plant collection was divided
unequally between both of the above venues. Differing temperature
and light controls exist in each area. Potting mix for the hole
collection was uniform (6 pts composted pinebark to 4 pts sharp
quartz sand and fertilizer) and watering was manually applied when
needed in both locations.
Temperature was regulated within the room by two evaporative
collecting units (1 wall fixed, the other mobile) set opposite each
other and 4.5 metres apart. The plants between these 2 coolers
receive cooled moist air which is constantly moving.
ANBG Average max. min. temp. nursery seed room
1989 December 22.3 deg C / 13.6 deg C
1990 January 22.7 deg C / 15.1 deg C
1990 February 20.6 deg C / 14.0 deg C
The botany dept's growth cabinets are pre-set from Nov 1989 to
provide an 8oc day and a 5oc night temperature resume. The
photoperiod was set at 16 hrs (Nov - March). Observations for this
March 1990 report were carried out 6-8/3/90 at both plant
Parameters of importance recorded were:
- Surviving popn nos per species
- Average hight of a taxon.
- General health and vigour (on a scale of 1-5)
Although not all species were represented in both moieties, the 20
spp that wee in both locations provided the following data:
Health and Vigour of Living plants. (Scale 1-5)
The superior ANBG-grown taxa included:
- 7 taxa were considered best at ANU
- 6 taxa were considered best at ANBG
- 7 taxa were considered equal for this criterion in a totally subjective analysis for comparison
The superior ANU-grown taxa:
- Polystichium vestitum
- Stilbocarpa polaris
- Epilobium peduncalare
- Blechnum penna-marine
- Ranunculus biternatus
- Montia fontana
- Colobanthus (8910560 P)
- Poa foliosa
- P. cookii
- Acaena magellanica
13 spp at ANBG have shown significant increases in height growth
when compared with their ANU counterparts. (This criterion is
however based upon the assumption that there was reasonable
uniformity at arrival time).
Cotula plumosa was the only ANU-grown species showing increased
comparative size, however its overall appearance was poorer than
the ANBG population.
Approximately half the ANBG taxa exhibited greener leaf colour than
the ANU taxa. These included Ranunculus biternatus,
Cotula, Polystichum vestitum, Colobanthus,
Stilbocarpa polaris, Isolepis aucklandica,
Epilobium brunnescens, E. pedunculare,
One taxon in both locations demonstrated similar yellow-green
colour, Coprosma perpusilla ssp. antarctica, with
an overall less than healthy appearance.
Pleurophyllum hookeri similarly is very poor in both collections,
with shrivelled and flaccid leaves.
A more glaucous leaf blade colour was observed for Poa cookii
at ANBG in comparison with its ANU population.
A separate check list of population sizes will be added.
Species represented in only one location:
Species Quantity condition
Montia fontana 1 Good
Colabanthus (8910560) 1 Good
Puccinellia macquariensis 11 Good
Luzual crinita varcrinita 3 Good
Single plant collections are to be divided to provide a larger
Species Quantity condition
Poa annua more than 5 Good
Hytrocotyle novae-zealandia 14 Good
The 'softer' warmer average conditions at ANBG have produced
increased metabolic activity and soft, lust growth for some taxa.
This possibly from increased photosynthesis and respiratory rates
with nutrient uptake.
Light quality and water availability have been similar in both
locations, as have day length and potting mix quality.
The cooler temperature regime available at ANU has reduces the
active growth experiences at the alternative venue where 'softer'
conditions have also favoured predacious insects. Poa and
Acaena spp. have been damaged by aphids.
*Incandescent light was added to the ANBG fluorescent system in
February. This while aiding photoperiod extension if required by
providing Red and Far Red light will not contribute to photosynthesis.
Both fluorescent and incandescent light are provided in ANU growth