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- Bengtson, Annika, et al.
(författare)
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Phylogeny of Anisopappus with species circumscriptions revisited (Asteraceae: Athroismeae)
- 2021
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Ingår i: Taxon. - : Wiley. - 0040-0262 .- 1996-8175. ; 70:2, s. 351-364
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Tidskriftsartikel (refereegranskat)abstract
- Anisopappus (Asteraceae: Athroismeae) is a genus with its main distribution in Africa (one species also in Asia), currently considered to include around 21 species. A molecular phylogenetic study of Anisopappus is presented for the first time, based on plastid (ndhF, trnL-trnF, trnQ-rps16) and nuclear (ETS, ITS) data. Anisopappus is confirmed to be monophyletic, and species interrelationships are resolved. The results differ from earlier treatments based on morphology, and the phylogenetic analyses reveal a need for changes in species circumscriptions as compared to those of the most recent treatment. Consequently, many taxa currently treated as synonyms are here shown to represent separate species indicating that the genus includes well over 40 species. Distribution patterns now emerge where several clades are found to consist of species restricted to a particular geographical region. The Anisopappus of Madagascar, many of which were earlier placed in synonymy with species found on the African continent, are here shown to be endemic, and the results reveal a need for further studies of that group.
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| 4. |
- Goffo, Elisa, et al.
(författare)
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Company for the Ultra-high Density, Ultra-short Period Sub-Earth GJ 367 b: Discovery of Two Additional Low-mass Planets at 11.5 and 34 Days
- 2023
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Ingår i: Astrophysical Journal Letters. - : Institute of Physics (IOP). - 2041-8213 .- 2041-8205. ; 955:1
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Tidskriftsartikel (refereegranskat)abstract
- GJ 367 is a bright (V ≈ 10.2) M1 V star that has been recently found to host a transiting ultra-short period sub-Earth on a 7.7 hr orbit. With the aim of improving the planetary mass and radius and unveiling the inner architecture of the system, we performed an intensive radial velocity follow-up campaign with the HARPS spectrograph—collecting 371 high-precision measurements over a baseline of nearly 3 yr—and combined our Doppler measurements with new TESS observations from sectors 35 and 36. We found that GJ 367 b has a mass of M b = 0.633 ± 0.050 M ⊕ and a radius of R b = 0.699 ± 0.024 R ⊕, corresponding to precisions of 8% and 3.4%, respectively. This implies a planetary bulk density of ρ b = 10.2 ± 1.3 g cm−3, i.e., 85% higher than Earth’s density. We revealed the presence of two additional non-transiting low-mass companions with orbital periods of ∼11.5 and 34 days and minimum masses of M c sin i c = 4.13 ± 0.36 M ⊕ and M d sin i d = 6.03 ± 0.49 M ⊕, respectively, which lie close to the 3:1 mean motion commensurability. GJ 367 b joins the small class of high-density planets, namely the class of super-Mercuries, being the densest ultra-short period small planet known to date. Thanks to our precise mass and radius estimates, we explored the potential internal composition and structure of GJ 367 b, and found that it is expected to have an iron core with a mass fraction of 0.91 − 0.23 + 0.07 . How this iron core is formed and how such a high density is reached is still not clear, and we discuss the possible pathways of formation of such a small ultra-dense planet.
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| 6. |
- Richards, Sophie L., et al.
(författare)
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Identifying Mozambique's most critical areas for plant conservation: An evaluation of protected areas and Important Plant Areas
- 2023
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Ingår i: BIOTROPICA. - 0006-3606 .- 1744-7429. ; 55:6, s. 1183-1194
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Tidskriftsartikel (refereegranskat)abstract
- Successful protected area networks must represent biodiversity across taxonomic groups. However, too often plant species are overlooked in conservation planning, and the resulting protected areas may, as a result, fail to encompass the most important sites for plant diversity. The Mozambique Tropical Important Plant Areas project sought to promote the conservation of Mozambique's flora through the identification of Important Plant Areas (IPAs). Here, we use the Weighted Endemism including Global Endangerment (WEGE) index to identify the richest areas for rare and endemic plants in Mozambique and subsequently evaluate how well represented these hotspots are within the current protected area and IPA networks. We also examine the congruence between IPA and protected areas to identify opportunities for strengthening the conservation of plants in Mozambique. We found that high WEGE scores, representing areas rich in endemic/near-endemic and threatened species, predict the presence of IPAs in Mozambique, but do not predict the presence of protected areas. We also find that there is limited overlap between IPAs and protected areas in Mozambique. We demonstrate how IPAs could be an important tool for ensuring priority sites for plant diversity are included within protected area network expansions, particularly following the adoption of the "30 by 30" target agreed within the post-2020 Convention on Biological Diversity framework, with great potential for this method to be replicated elsewhere in the global tropics. As redes de areas protegidas bem-sucedidas devem representar a biodiversidade de diversos grupos taxonomicos. No entanto, frequentemente as especies de plantas sao negligenciadas no planeamento da conservacao, e como resultado, as areas protegidas podem nao abranger os locais mais importantes para a diversidade de plantas. O projeto "areas Importantes de Plantas Tropicais de Mocambique" procurou promover a conservacao da flora de Mocambique atraves da identificacao de areas Importantes de Plantas (IPAs). Aqui usamos o indice de Endemismo Ponderado incluindo Ameaca Global (WEGE) para identificar as areas mais ricas em plantas raras e endemicas em Mocambique e, subsequentemente, avaliar o quao bem representados estes hotspots estao dentro da actual rede de areas protegidas e IPAs. Tambem examinamos a congruencia entre IPAs e areas protegidas para identificar oportunidades de fortalecer a conservacao de plantas em Mocambique. Descobrimos que valores altos de WEGE, representando areas ricas em especies endemicas/quase-endemicas e ameacadas, preveem a presenca de IPAs em Mocambique, mas nao preveem a presenca de areas protegidas. Tambem descobrimos que ha uma limitada sobreposicao entre IPAs e areas protegidas em Mocambique. Demonstramos como as IPAs poderiam ser uma ferramenta importante para garantir que os locais prioritarios para a diversidade de plantas estejam incluidos na expansao da rede de areas protegidas, particularmente apos a adopcao das Metas do Quadro Global "30 por 30" da Convencao sobre Diversidade Biologica, com grande potencial para que este metodo seja replicado em outras areas dos tropicos globais. Plants are often overlooked in conservation planning. In Mozambique, we find that the richest areas for rare and threatened plant species are poorly represented within the protected area network. We use Important Plant Areas and the Weighted Endemism including Global Endangerment (WEGE) index to identify opportunities to better conserve Mozambique's flora.
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| 7. |
- Svensson, S, et al.
(författare)
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New end station for the study of gases, liquids, and solid films at the MAX laboratory
- 1996
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Ingår i: REVIEW OF SCIENTIFIC INSTRUMENTS. - : AMER INST PHYSICS. ; 67:6, s. 2149-2156
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A new end station equipped with a very high-resolution SES-200 electron energy analyzer has been constructed for the study of gases and soft molecular materials. The analyzer is rotatable around the direction of the photon beam, allowing angular-dependent
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