| 1. |
- Bacon, Christine D., et al.
(författare)
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Evolutionary persistence in Gunnera and the contribution of southern plant groups to the tropical Andes biodiversity hotspot
- 2018
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Ingår i: PeerJ. - : PeerJ. - 2167-8359. ; 2018:3
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Tidskriftsartikel (refereegranskat)abstract
- Several studies have demonstrated the contribution of northern immigrants to the flora of the tropical Andesthe world's richest and most diverse biodiversity hotspot. However, much less is known about the biogeographic history and diversification of Andean groups with southern origins, although it has been suggested that northern and southern groups have contributed roughly equally to the high Andean (i.e., páramo) flora. Here we infer the evolutionary history of the southern hemisphere plant genus Gunnera, a lineage with a rich fossil history and an important ecological role as an early colonising species characteristic of wet, montane environments. Our results show striking contrasts in species diversification, where some species may have persisted for some 90 million years, and whereas others date to less than 2 Ma since origination. The outstanding longevity of the group is likely linked to a high degree of niche conservatism across its highly disjunct range, whereby Gunnera tracks damp and boggy soils in cool habitats. Colonisation of the northern Andes is related to Quaternary climate change, with subsequent rapid diversification appearing to be driven by their ability to take advantage of environmental opportunities. This study demonstrates the composite origin of a mega-diverse biota.
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| 2. |
- Wanntorp, L, et al.
(författare)
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Phylogeny of Gunnera
- 2001
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Ingår i: PLANT SYSTEMATICS AND EVOLUTION. - : SPRINGER-VERLAG WIEN. - 0378-2697. ; 226:1-2, s. 85-107
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Tidskriftsartikel (refereegranskat)abstract
- The phylogeny of the genus Gunnera is investigated for the first time. Twelve species representing the six currently recognised subgenera are analysed. Two chloroplast DNA regions, the rbcL gene and the rps16 intron, together provide 46 informative ch
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| 3. |
- Dehghani, Reihaneh, et al.
(författare)
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Phylogeography of the white-tailed mongoose (Herpestidae, Carnivora, Mammalia) based on partial sequences of the mtDNA control region (p 385-393)
- 2008
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Ingår i: Journal of Zoology. ; :276, s. 385-393
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Tidskriftsartikel (refereegranskat)abstract
- The phylogeography of the white-tailed mongoose Ichneumia albicauda is examined using phylogenetic analyses based on partial sequences of the mitochondrial control region. The phylogeny is used to: (1) Analyse the phylogeographic pattern of I. albicauda; (2) discuss the existing delimitation of subspecies; (3) test if the coloration of the tail tip, generally white but occasionally black in West African specimens, is a species polymorphism or if it has phylogenetic significance. Our results suggest a north–south division within white-tailed mongoose populations, and within the northern clade, we observe an east–west subdivision. This phylogenetic pattern is partly in concordance with the traditional division into six subspecies. The white-tailed mongoose probably originated in southern Africa, from where it dispersed northwards and colonized eastern and western parts of Africa, as well as the Arabian Peninsula. Colour polymorphism observed in Western populations reflects variation at the individual level.
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| 4. |
- Kunze, H., et al.
(författare)
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Corona and anther skirt in Hoya (Apocynaceae, Marsdenieae)
- 2008
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Ingår i: Plant Systematics and Evolution. - : Springer Science and Business Media LLC. - 0378-2697 .- 1615-6110. ; 271:02-jan, s. 9-17
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Tidskriftsartikel (refereegranskat)abstract
- The so called revolute margins of the corona in the genus Hoya (Marsdenieae) are homologous to the anther skirt. The anther skirt is primarily formed of two latero-basal lobes of the anther. In Hoya these lobes are fused with the underside of the basal process of the staminal corona and have evolved into a dominant structure of the gynostegium. Embedded in the anther skirt is the nectar tube, formed by the basal elongation of the guide rail. In many species, however, the function of nectar secretion for pollinator reward has been transferred to the anther skirt beneath the basal process of the corona. A survey of the Marsdenieae shows that the potential for developing an anther skirt is present in several other genera as well, though nowhere has it evolved into such elaborated structures as in Hoya.
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