The weather was generally good, except one rainy day, allowing the fieldwork
to proceed within 4 days. Five altitudes were sampled along the gradient from 70
m to 800 m (Figure 1). The transect was set up along the north side of the island, that includes
an Protected Area for Habitat or Species Management and a Protected Area of
Resource Management. In Flores Island, the uplands and wetlands of the Central
Highlands contains one of the largest and best preserved bog Atlantic
associated with Juniperus brevifolia forest,
essential to the hydric balance of the island.
Fig.1: Map of the localities sampled at five different elevations. |
We briefly
describe here the sampling sites and illustrate the gradient with some
photographs:
70 m – Ponta do Ilhéu (Fig. 2)
Plot 1
coordinates: N39°30'22,8''; W31°11'40,3''
Plot 2
coordinates: N39°30'22,4''; W31°11'40,6''
Fig.2: Vegetation type in the lowland of Flores (D. Henriques) |
Vegetation is dominated
by Picconia azorica, Pittosporum
undulatum and Morella faya. The
canopy is high, average 5,2 m. Bryophytes cover similarly soil, rocks and
trunks between 5 and 25%.
200 m – Caminho para Ponta Delgada (Fig. 3)
Plot 1
coordinates: N 39°30'24,8''; W 31°12'46,3''
Plot 2
coordinates: N 39°30'23,8''; W 31°12'45,9''
Fig.3: Atrichum sp. mixed with Fissidens sp on the ground (M. Coelho) |
At this step, we found native trees like Erica
azorica, Vaccinium cylindraceum, Juniperus brevifolia and Morella
faya, and the non-native Pittosporum undulatum. The maximum height of the canopy was 5,8 m. There were more bryophytes (25%) on rocks than on soil or tree trunks.
400 m – Outeiros (Fig.
4)
Plot 1
coordinates: N 39°30'06,9''; W 31°12'20,1''
Plot 2 coordinates:
N 39°30'06,6''; W 31°12'20,1''
Fig.4: Team on the field in Ponta do Ilhéu (F. Pereira) |
Forest system; the
canopy is higher (maximum of 6,2 m). However half of the vegetation is formed
by Pittosporum undulatum and there
are also large Hedychium gardnerianum plants. Native
species such as Erica azorica, Picconia azorica, Laurus azorica, Morella
faya and Vaccinium cylindraceum were
also present but in lower abundance (15-40%). Bryophytes cover was higher in
trunks (ca. 60%), but significantly present on soil (ca. 40%).
600 m – Ribeira do Cascalho (Fig. 5)
Plot 1
coordinates: N 39°28'58,1''; W 31°11'25,5''
Plot 2
coordinates: N 39°28'57,6''; W 31°11'25,2''
Fig.5: Sphagnum sp. and Polytrichum sp. cover the soil on Ribeira do Cascalho (D. Henriques) |
Forest system with trees up to 3,9 m high. Forest vegetation is dominated by Juniperus brevifolia (90%), being called Zimbral. Vaccinium cylindraceum, Ilex perado subsp. azorica, Laurus azorica and Myrsine africana were also present but in lower amounts, 30%, 25%, 15% and 25% respectively. Cover of bryophytes is predominant on the soil (80%) and on trees (80%).
800 m – Morro Alto (Fig. 6)
Plot 1
coordinates: N 39°27'47,5''; W 31°13'33,4''
Plot 2
coordinates: N 39°27'47,7''; W 31°13'33,6''
Fig.6: Sphagnum sp. surrounding the largest Erica azorica in Plot 2 at Morro Alto (D. Henriques) |
All samples of the
Flores transect were curated in Terceira Island and wait for analysis at the
University of Azores.
Text and Photographs:
Márcia Coelho, Débora Henriques, Fernando
Pereira and Rosalina Gabriel.
Angra do Heroísmo, Terceira Island, Azores, Portugal - 2013.
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