Since there is no
publication at all dealing with the vulnerability in
Hoya and sister genera anywhere in its entire
distribution range, and only a little
is known about PNG's species, extensive fieldwork is needed to collect specimens
for further research that will reveal a lot of new data.
This survey is first
of its kind, and is expected to contribute a great deal
of scientific data on e.g.:
- genetical relationships between closely allied genera
- specitation and distribution
- rate of endemicity for New Guinea
- reasons behind the vulnerability
- species likely vulnerable to global warming
- conservational status for each species
This survey will keep
a big number of living material in cultivation in PNG,
to facilitate access to fresh research material. This collection also acts
like an ex
situ conservation site, for vulnerable species with very limited
After the end of
survey, the living material may be utilized for
re-colonization in protected areas.
will the survey be conducted?
am collecting specimens all over PNG, from sea level up
to 3000 metres above sea level.
exhausting trekkings inside the wonderful majestic but
also almost impenetrable primary forests, full of huge
tree roots to climb over, and mud slides to slide down
to get anywhere, hords of stubborn malarial mosquitoes
seeking for blood, and the leeches. Sometimes it means I stay
for weeks inside the forests with the most
unimaginable creatures that only exists here.
I usually have local
guides accompanying me. They are often deaf people who want to
prove that they can be guides just well as hearing
visual perception is usually more sharp to replace their
hearing, making them able to see
details quicker and spot the hoyas more easily among
thousands of green leaves.
At least three or four
populations are collected from each species if
possible, for genetical variation and to check the
The montane species
are cultivated at a level of 1500 metres above sea level
in Eastern Highlands province for the montane species.
The lowland species are grown at 50-250 metres above sea
level in the outskirts of Lae town in Morobe Province. They
are grown outdoors under shade cloth, receiving rain,
allowing them to manage themselves apart from
occassional need of irrigation during dry spells.
The cuttings are planted in blocks of
(WWW.EPIWEB.SE), a plastic growing medium
replacing the similar organic substrate
Dicksonia/Xaxim derived from tree ferns which are
endangered. Dusk Tropic contributed to the project by
reducing the price greatly.
The survey is estimated to complete in five years,
if I find all fundings needed. The initial three years
are the most intense with many long
trips and treks. Thereafter, I begin to analyze the
collected specimens and data, while they please to
flower in the collection site, and finishes when all
specimens have flowered.
All specimens must flower, to be able to compare different
populations of one single species. Then we can evaluate
the intraspecific variations and the boundaries between
different species which is fundamental prior to a
revision of PNG's hoyas.
There are numerous species complexes in PNG where the
specimens are morphologically difficult to
discriminate specieswise, as many specimens overlap each
Genetical (molecular) analyzes may be an important tool to
understand these complexes.
particular the molecular, are made in collaboration
with eg. Michele Rodda (University of Turin,
Italy) and Livia Wanntorp (Swedish Museum of Natural