|
FLORISTICS
AND CONSERVATION
OF ORCHIDACEAE AT NATURAL RESERVE IN RIO DE JANEIRO
Eduardo
Martins Saddi &
Rosana Conrado Lopes (1)
Regina Helene Potsch Andreata (2)
An
Abstract of a work published
in Selbyana 25(2): 000-000.2004
|
The
Work
The authors have worked in a Reserve in the district
of Rio de Janeiro which name and coordinates are
not giving for conservation reason as some species
found in the area are endangered. From February
2003 to February 2004, they made monthly 3-day trips
to the study area. The work consisted of surveying
the Floristic and conserving the Orchidaceae
in an area which represents a valuable remnant of
the Atlantic Pluvial Forest. |
This
reserve, with 20–1050 m elevation in an
area of 1305 ha, lies within the Rio Grande watershed,
and this river runs full course through a deep
valley, descending sharply from source to mouth
over steep terrain with a 37º slope (Vidal
1995). In contrast to other surveys of the orchid
family in the State of Rio de Janeiro, the Reserve
is the smallest area but the richest in orchid
species makes it an important forest remainder
in the State. The region has a warm climate with
a mean annual temperature of 22ºC, rainfall
of 1200– 2500 mm, and 11–12 months
with 800 mm of hydric excess. Ten main trails
cut through the reserve, which is considerably
influenced by human activities, especially from
ca. 20–420 m elevation, where bananas once
were planted. Above 450 m, the forest becomes
more dense and humid, with large trees forming
a canopy ca. 20–30 m tall (Quinet 2002). |
The
orchid family is the most representative one among
the monocotyledons, representing 48% of the total
species in this group. Two subfamilies, 43 genera,
and 88 species of orchids have been identified
in the Reserve. The most representative genera
are Pleurothallis (13 spp.) and Epidendrum
(9 spp.) |
MATERIAL
AND METHODS
Floristic
As part of their research, the authors revised
the list of Orchidaceae species compiled by botanists
from the Angiosperm Laboratory, Santa Ursula University
(USU), who have been collecting in the area since
1996 as part of this Reserve Floristic Project.
They made botanical collections along the trails
and in the surroundings, giving preference to
flowering and fruiting material. They recorded
data on morphology, population numbers, phenology,
life forms, substrate type, and altitude. Flowers
were fixed in 70% alcohol with 10% glycerin for
later analysis (Pinheiro 1999). Specimens were
pressed and dried according to standard procedures
(Fidalgo & Bononi 1984) and deposited in the
Santa Ursula University Herbarium (RUSU). Whenever
possible, duplicates were sent to the Rio de Janeiro
Federal University Herbarium (RFA) (abbreviations
follow Holmgren et al. 1990).
Data on major plant groups in the study area are
presented. Taxonomic studies were based on the
literature as well as consultations with specialists
and with the collections of the Research Institute,
Rio de Janeiro Botanical Garden. The classification
system follows Dressler (1993).
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RESULTS
AND DISCUSSION
The orchid species list compiled by the team of
this Reserve Floristic Project originally had
29 species and 22 genera of Orchidaceae. After
one year of collecting in the area, the list grew
to 88 species in 43 genera (TABLE 1). Of this
total, 59 species were collected solely by the
senior author, 17 by the project team, and 12
by both .
Orchidaceae make up 48% of the monocots
found in this Reserve, followed by Araceae
(10%), Marantaceae (9%), Commelinaceae
(8%), Bromeliaceae (8%), and other families
(17%).
The Orchidaceae consists of five subfamilies (Dressler
1993), three of which have representatives in
Brazil. The orchid species at this Reserve belong
to two subfamilies—Epidendroideae
and Spiranthoideae—which are mostly
epiphytes or terrestrial species, respectively.
Of the 43 genera, the most species-rich are Pleurothallis
(13 spp.), Epidendrum (9 spp.), Maxillaria
(6 spp.), Beadlea (5 spp.), Octomeria
(5 spp.), Oncidium (4 spp.), Bifrenaria
(2 spp.), Dichaea (2 spp.), Eltroplectris
(2 spp.), Eurystyles (2 spp.), Gomesa
(2 spp.), Promenaea (2 spp.), Prosthechea
(2 spp.), and Stelis (2 spp.); and
the other genera have one species each .
Regarding life form, 61 of the 88 species analyzed
are strictly epiphytes, 20 are strictly terrestrial,
and 7 are epiphytes and terrestrial. The terrestrial
species are classified as terrestrial (12 spp.),
rupicolous (4 spp.), saxicolous (3 spp.), and
saprophytes (1 sp.).
Of the 61 strictly epiphytic species, 57 belong
to the subfamily Epidendroideae. Although most
of the genera in this subfamily have only epiphytic
species, some genera, such as Malaxis and
Oeceoclades, include terrestrial species
(Fraga 2000).
Of the 20 terrestrial species, 12 belong to the
Spiranthoideae, which represents the life form
most commonly found in this subfamily.
All seven species that have both terrestrial and
epiphytic life forms are found on the banks of
the Rio Grande. Two of these species are found
in other habitats (forest interior or rocky outcrops),
where they always occur as one life form. For
instance, Epidendrum secundum Jacq. is
a terrestrial plant growing on rocky outcrops,
and Isochilus linearis (Jacq.) R. Br. is
an epiphyte in the forest. |
TABLE
1 |
Orchid
checklist of this natural reserve RJ, Brazil.
|
Orchid
species |
Orchid
species |
Beadlea
bicolor (Ker- Gawl.) Garay
Beadlea elata (Sw.) Small
Beadlea elegans (Hoehne) Garay
Beadlea itatiaiensis (Krzl.) Garay
Beadlea aff. longibracteata (Barb.
Rodr.) Garay
Bifrenaria harrisoniae (Hook) Rchb.f.
Bifrenaria inodora Lindl.
Bulbophyllum micranthum Barb. Rodr.
Campylocentrum sellowii (Rchb. f.) Rolfe
Cattleya forbesii Lindl.
Cirrhaea saccata Lindl.
Cochleanthes sp.
Constantia rupestris Barb. Rodr.
Cyrtopodium polyphyllum (Vell.) Pabst ex
F.Barros
Dichaea cogniauxiana Schltr.
Dichaea pendula (Aubl.) Cogn.
Dipteranthus pellucidus (Rchb.) Cogn.
Elleanthus sp.
Eltroplectris janeirensis (Porto & Brade)
Pabst
Eltroplectris triloba (Lindl.) Pabst
Encyclia patens Hook.
Epidendrum armeniacum Lindl.
Epidendrum campaccii Hágsater &
L. Sánchez
Epidendrum filicaule Lindl.
Epidendrum geniculatum Herb. Ham.
Ex Hook.f.
Epidendrum ramosum Jacq.
Epidendrum rigidum Jacq.
Epidendrum secundum Jacq.
Epidendrum vesicatum Lindl.
Epidendrum sp.
Erythrodes arietina Ames
Eurystyles cogniauxii (Krlz.) Pabst
Eurystyles cotyledon Wawra
Galeandra beyrichii Rchb. f.
Gomesa crispa Klotzch ex Rchb. f.
Gomesa planifolia Klotzch ex Rchb. f.
Gongora bufonia Lindl.
Hapalorchis lineata Schltr.
Isochilus linearis (Jacq.) R. Br.
Laelia crispa (Lindl.) Rchb. f.
Lankesterella ceracifolia (Barb. Rodr.) Mansf.
Leptotes bicolor Lindl.
Malaxis excavata Kuntze
Maxillaria brasiliensis Brieger & Bicalho
Maxillaria marginata (Lindl.) Fenzl.
Maxillaria parviflora (Poepp. & Endl.) |
Maxillaria
picta Hook.
Maxillaria rufescens Lindl.
Maxillaria sp. 1
Mesadenella cuspidata (Lindl.) Garay
Octomeria albopurpurea Barb. Rodr.
Octomeria juncifolia Barb. Rodr.
Octomeria oxIchella Barb. Rodr.
Octomeria tricolor Rchb.f.
Octomeria sp.
Oeceoclades maculata (Lindl.) Lindl.
Oncidium cornigerum Lindl.
Oncidium fimbriatum Lindl.
Oncidium flexuosum Sims.
Oncidium longipes Lindl.
Pelexia novofriburgensis (Rchb. f.) Garay
Phymatidium tillandsoides Barb. Rodr.
(Phymatdium falcifolium Lindl.)
Pleurothallis aphtosa Lindl.
Pleurothallis bidentula Barb. Rodr.
Pleurothallis compressiflora Barb. Rodr.
(Pleurothallis auriculata Lindl.)
Pleurothallis granulosa (Barb. Rodr.)
Pleurothallis grobyi Bateman ex. Lindl.
Pleurothallis hypnicola Lindl.
Pleurothallis lineolata (Barb. Rodr.)
Pleurothallis rubens Lindl.
Pleurothallis saundersiana Rchb.f.
Pleurothallis aff. trifida Lindl.
Pleurothallis sp. 1
Pleurothallis sp. 2
Pleurothallis sp. 3
Polystachya concreta (Jacq.) Garay
Prescottia plantaginea Lindl.
Promenaea ovatiloba Cogn.
Promenaea paulensis Schltr.
Prosthechea pygmaea (Hook) W. E.
Prosthechea vespa (Vell.) W. E.
Sacoila lanceolata (Aubl.) Garay
Sarcoglottis fasciculata (Vell.) Schltr.
Stanhopea guttulata Lindl.
Stelis megantha Barb. Rodr.
Stelis aff. modesta Barb. Rodr.
Tetragamestus modestus Rchb.f. (Scaphyglottis
modesta Schltr.)
Wullschlaegelia aphylla Rchb. f.
Xylobium variegatum (Ruiz & Pav.) |
Constantia
rupestris |
Diptheranthus
pellucidus |
Erythrodes
arietina |
Malaxis
excavata |
Malaxis
excavata - detalhe |
Maxillaria parviflora |
Pelexia novofriburguensis |
Laelia crispa |
Oncidium
longipes |
Oncidium
longipes - detalhe |
Stanhopea guttulata |
Sacoila lanceolata |
Vanilla angustipetala |
Phymathydium tillandsioides
|
Gongora
bufonia |
Conservation
Status
Endangered
plant species have been listed for several states and municipalities
in Brazil and references to conservation status were found for
24 species in listings by this reserve for habitats in four states:
Rio Grande do Sul (RS), Paraná (PR), Rio
de Janeiro Municipality (RJ), and for the sandy coastal
plains of Espírito Santo (ES). They have been analyzed
and placed in the following categorie: Nine species fall into
the category Endangered (EN), six are Vulnerable (VU),
five are Low Risk (LR), one is Rare (RARE), and
two have deficient data (DD). Bifrenaria harrisoniae
(Hook) Rchb.f. was classified as Endangered in RS and RJ Municipality,
while Cyrtopodium polyphyllum (Vell.) Pabst ex F. Barros
is endangered in RS and Low Risk on the sandy coastal plains of
ES. Sixteen of the 24 species are being cultivated at JBRJ, where,
in the future, they can be utilized for propagation actions, re-introduction,
and education (TABLE 2).
Sources: Banco de Dados Tropical (BDT 2004), Secretaria
Municipal de Meio Ambiente (SMAC 2000), and Fraga
(2000).
|
Conservation
status of 24 species from the checklist
of this natural Reserve per locality |
species |
RS |
PR |
RJ |
ES |
JBRJ
Greenhouse |
Beadlea
elegans |
|
|
|
VU |
|
Bifrenaria
harrisoniae |
EN |
|
EN |
|
|
Bifrenaria
inodora |
EN |
|
|
|
X |
Cattleya
forbesii |
|
|
EN |
|
X |
Cirrhaea
saccata |
EN |
|
|
|
X |
Cyrtopodium
polyphyllum |
EN |
|
|
LR |
X |
Eltroplectris
triloba |
|
|
|
LR |
|
Epidendrum
rigidum |
|
|
|
VU |
|
Epidendrum
secundum |
|
|
|
DD |
X |
Erythrodes
arietina |
EN |
|
|
|
X |
Gongora
bufonia |
|
RARE |
|
|
X |
Hapalorchis
lineata |
|
EN |
|
|
|
Leptotes
bicolor |
|
EN |
|
|
X |
Mesadenella
cuspidata |
|
|
|
VU |
X |
Oeceoclades
maculata |
|
|
|
LR |
|
Pleurothallis
auriculata |
|
|
|
EN |
X |
Pleurothallis
grobyi |
|
|
|
VU |
X |
Pleurothallis
saundersiana |
|
|
|
VU |
X |
Polystachya
concreta |
|
|
|
LR |
X |
Prescottia
plantaginea |
|
|
|
LR |
X |
Prosthechea
pygmaea |
|
|
|
VU |
|
Sacoila
lanceolata |
|
|
|
DD |
X |
Sarcoglottis
fasciculata |
|
|
|
LR |
X |
Wullschlaegelia
aphyla |
|
EN |
|
|
|
In
and Ex-situ Conservation
Conserving natural habitats will protect many species, including
orchids; but some species require more specific measures (IUCN
1996). The conservation of species may depend on both in-situ
and ex-situ strategies. In-situ conservation takes place in conservation
units, while ex-situ conservation depends on seed banks, botanical
garden collections, nurseries with testimonial seedlings, cryopreservation,
and in-vitro collections. These methods complement one another,
because not all wild species and their populations can be maintained
in natural reserves or environmental protection areas, which often
have been reduced to small areas by urban sprawl and expanding
agricultural frontiers (Cavalcanti & Walter 1998).
Ex-situ Conservation - Live collections
Live collections are essential for conservation,
especially regarding propagation and reintroduction
of orchid species. These plants produce thousands
of seeds, and there are well-known techniques
for their symbiotic and asymbiotic germination.
Such activities must be closely followed by studies
of geographic distribution, habitat specificity,
and population size of each species (IUCN 1996).
The orchid collection maintained by the Research
Institute of the Rio de Janeiro Botanical Garden
(JBRJ) aims to scientifically conserve and propagate
genetic material from the Brazilian Flora, thus
contributing to the ex-situ conservation of endangered
species. As a result, the vegetative specimens
are deposited in the Live-Plant Collection of
this institution.
Today, it contains 124 specimens belonging to
38 genera and 52 species. Some 72 of these plants
have not yet flowered and have only been identified
to the genus level. Of the 88 species that make
up the list of orchids at the reserve, 45 are
under cultivation (51% of the total number of
species). Thirteen species (15% of the total)
have not yet flowered and have only been identified
to the genus level. Besides adding a significant
number of taxa to the list, the live collection
has allowed us to observe the development and
morphological aspects of vegetative and reproductive
organs of the species, which will contribute to
future studies. Educational programs related to
orchid collections are needed, especially in the
tropics, because otherwise conservation efforts
will not bear fruit (Davis et al. 1986).
Eduardo Saddi points out the importance of every alive collection
to be referencied. Since the plants have been already collected,
it is necessary that this agression to the nature has, at least,
an utility. It is necessary that the collector creates a referencied
data bank with registers of all possible information about the
collection in order to, in a near or next future, the collection
becomes useful for conservationist aims. A non-referencied collection
is useless for the science. If the data are only known by the
collector, the collection loses its scientific means because in
case of forgetfulness or his decease, all information are lost.
ACKNOWLEDGMENTS
The authors thanked Marta Moraes and Melissa Bocayuva for their
support with the live collection at JBRJ; Dorothy S.D. de Araujo
for translation of the manuscript; Pablo V. Prieto and Carlo A.
Zaldini for their assistance in the field; Carl Luer and the IOCC
II ‘‘team’’ for their hospitality at the
Marie Selby Botanical Gardens and the Brazilian Scientific Academy
for the grants.
Note of the editor - New occurence to the state
of Rio de Janeiro.
Stanhopea guttulata is a new occurrence
for the state of Rio de Janeiro, as well Vanilla
angustipetala and Maxillaria parviflora.
Former registers:
Stanhopea guttulata - Espírito Santo
Vanilla angustipetala - Paraná and
Santa Catarina
Maxillaria parviflora - from north, northeast
and center-west regions
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(1)Universidade
Federal do Rio de Janeiro–CCS–Instituto
de Biologia–Bl.A1–092–Laboratório
de Taxonomia Vegetal e Biologia Reprodutiva. Av.
Brigadeiro Trompowsky, s.n., Ilha do Fundão
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