Les forêts littorales de la région de Libreville (Gabon) et leur importance pour la conservation: description d'un nouveau Psychotria (Rubiaceae) endémique

Lachenaud, Olivier

doi:10.5091/plecevo.2013.744

Cited by 15 publications

(20 citation statements)

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“…Flowering is seasonal and so far recorded only in December-January. Notes -This uncommon species, previously considered as endemic to the Libreville region (Lachenaud et al 2013) was recently discovered further south in the Ogooué delta. Two other supposed "Libreville endemics", Psychotria klainei Schnell and P. wieringae O.Lachenaud, were also found in the same region, which indicates a floristic affinity between the two areas.…”

Section: Salacia Diplasia Nhallé Figs 6c and 7c-ementioning

confidence: 98%

Novitates Gabonenses 88: additions to the flora of Gabon and new records of little-known species

Lachenaud¹,

Stévart²,

Boupoya³

et al. 2018

Pl. Ecol. Evol.

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Background and aims – The intensive botanical prospections carried out in Gabon since the publication of the national checklist in 2006 have resulted in c. 34 300 new specimens (amounting to 30% of all collections made in the country) and an annual increase of 25 species in average. As a result, 5175 species of vascular plants are now recorded from Gabon, of which 650 are considered endemic. However, most of the recent discoveries have not yet been published. This paper is the first of a series documenting additions to the flora of Gabon, and new records of poorly known species. It concerns specifically new records from the Lower Ogooué Ramsar site, the third largest delta of Africa, and certainly the most intact, which includes 80% of the country’s wetlands and a wide variety of other habitats.Methods – The new records presented here come essentially from fieldwork conducted in Gabon between 2008 and 2016 by the authors and colleagues. Further information comes from the study of herbarium specimens in BR, BRLU, K, LBV, MO, P and WAG. For each species, information on distribution and ecology is given, and the studied Gabonese collections listed. In case of rare or range-restricted species, collections from other countries are also listed, and a distribution map is provided, as well as an evaluation of the conservation status based on the categories and criteria of the IUCN Red List.Key results – We report 18 additions to the flora of Gabon, including four genera new to the country (Capparis, Gisekia, Hoffmanniella and Leptochloa) and the first records of the neotropical Justicia secunda being naturalised in tropical Africa. New distribution records are also provided for 16 rare Gabonese endemics or near-endemics. Some species are also newly reported from Cameroon (Cissus leemansii, Salacia coronata) and Equatorial Guinea (Cissus leemansii, C. louisii, Lychnodiscus grandifolius, Placodiscus resendeanus, Rutidea gabonensis, Uvaria bipindensis). Two species, which were reported in the 2006 checklist based on misidentifications, are excluded from the Gabonese flora.

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Section: Salacia Diplasia Nhallé Figs 6c and 7c-ementioning

confidence: 98%

Novitates Gabonenses 88: additions to the flora of Gabon and new records of little-known species

Lachenaud¹,

Stévart²,

Boupoya³

et al. 2018

Pl. Ecol. Evol.

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“…It also the highest level of diversity of both plant species overall and of endemics (Sosef 2005). The coastal forests of the Libreville area are known to be especially rich in globally restricted species (Lachenaud et al 2013). These authors detail 19 species globally restricted to the Libreville area, of which eight have not been seen recently and which are possibly extinct.…”

Section: P Ebomentioning

confidence: 99%

“…Most of the collections of this possibly extinct species of Octoknema were also, as with Pseudohydrosme buettneri, from Libreville-Sibang, and were mainly made in the period 1896-1912, during the colonial period, before the city expanded to its current extent. The other seven species recorded as globally restricted to the Libreville area and as possibly extinct by Lachenaud et al (2013): are Ardisia pierreana Taton (Taton,1979), Dinklageella villiersii Szlach. & Olszewski (Szlachetko & Olszewski, 2001), Eugenia librevillensis Amshoff (Amshoff, 1958), Hunteria hexaloba (Pichon) Omino (Omino,1996), Pandanus parvicentralis Huynh (Huynh, 1986), Psychotria gaboonensis Ruhsam (Ruhsam et al 2008) and Tristemma vestitum Jacq.-Fél.…”

Section: P Ebomentioning

confidence: 99%

Taxonomic revision of the threatened African genusPseudohydrosmeEngl. (Araceae), withP. ebo, a new, Critically Endangered species from Ebo, Cameroon

Cheek

Tchiengué²,

Burgt

2020

Preprint

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This is the first revision in nearly 130 years of the African genus Pseudohydrosme, formerly considered endemic to Gabon. Sister to Anchomanes, Pseudohydrosme is distinct from Anchomanes because of its 2–3-locular ovary (not unilocular), peduncle concealed by cataphylls at anthesis and far shorter than the spathe (not exposed, far exceeding the spathe), stipitate fruits and viviparous (vegetatively apomictic) roots (not sessile, roots non-viviparous). Three species, one new to science, are recognised, in two sections. Although doubt has previously been cast on the value of recognising Pseudohydrosme buettneri, of Gabon, it is here accepted and maintained as a distinct species in the monotypic section, Zyganthera. However, it is considered to be probably globally extinct. Pseudohydrosme gabunensis, type species of the genus, also Gabonese, is maintained in Sect. Pseudohydrosme together with Pseudohydrosme ebo sp.nov. of the Ebo Forest, Littoral, Cameroon, the first addition to the genus since the nineteenth century, and which extends the range of the genus 450 km north from Gabon, into the Cross-Sanaga biogeographic area. The discovery of Pseudohydrosme ebo resulted from a series of surveys for conservation management in Cameroon, and triggered this paper. All three species of Pseudohydrosme are morphologically characterised, their habitat and biogeography discussed, and their extinction risks are respectively assessed as Critically Endangered (Possibly Extinct), Endangered and Critically Endangered using the IUCN standard. Clearance of forest habitat for logging, followed by agriculture or urbanisation are major threats. One of the species may occur in a formally protected areas and is also cultivated widely but infrequently in Europe and the USA for its spectacular inflorescences.

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“…The sandy-clayey soils in the area developed from shales and slates. Different vegetation types occur in this forested area, including Aucoumea-dominated forests and mixed forests [31]. Some zones of the Mondah study area have undergone significant disturbance (area of highest rate of deforestation across Gabon sensu Hansen et al 2013; see [32]), but other patches remain protected [33].…”

Section: ) Mondahmentioning

confidence: 99%

In Situ Reference Datasets From the TropiSAR and AfriSAR Campaigns in Support of Upcoming Spaceborne Biomass Missions

Labrière¹,

Tao²,

Chave³

et al. 2018

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Tropical forests are a key component of the global carbon cycle. Yet, there are still high uncertainties in forest carbon stock and flux estimates, notably because of their spatial and temporal variability across the tropics. Several upcoming spaceborne missions have been designed to address this gap. Highquality ground data are essential for accurate calibration/validation so that spaceborne biomass missions can reach their full potential in reducing uncertainties regarding forest carbon stocks and fluxes. The BIOMASS mission, a P-band SAR satellite from the European Space Agency (ESA), aims at improving carbon stock mapping and reducing uncertainty in the carbon fluxes from deforestation, forest degradation and regrowth. In situ activities in support of the BIOMASS mission were carried out in French Guiana and Gabon during the TropiSAR and AfriSAR campaigns. During these campaigns, airborne P-band SAR, forest inventory and lidar data were collected over six study sites. This paper describes the methods used for forest inventory and lidar data collection and analysis, and presents resulting plot estimates and aboveground biomass maps. These reference datasets along with intermediate products (e.g. canopy height models) can be accessed through ESA's Forest Observation System and the Dryad data repository and will be useful for BIOMASS but also to other spaceborne biomass missions such as GEDI, NISAR and Tandem-L for calibration/validation purposes. During data quality control and analysis, prospects for reducing uncertainties have been identified, and this paper finishes with a series of recommendations for future tropical forest field campaigns to better serve the remote sensing community.

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Les forêts littorales de la région de Libreville (Gabon) et leur importance pour la conservation: description d'un nouveau Psychotria (Rubiaceae) endémique

Cited by 15 publications

References 1 publication

Novitates Gabonenses 88: additions to the flora of Gabon and new records of little-known species

Novitates Gabonenses 88: additions to the flora of Gabon and new records of little-known species

Taxonomic revision of the threatened African genusPseudohydrosmeEngl. (Araceae), withP. ebo, a new, Critically Endangered species from Ebo, Cameroon

In Situ Reference Datasets From the TropiSAR and AfriSAR Campaigns in Support of Upcoming Spaceborne Biomass Missions

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