Boreotropics
WebThe formation and breakup of the boreotropics seems to have then played a key role in the formation of intercontinental disjunctions within the Cinnamomum group. The … WebOct 29, 2004 · Annonaceae are a pantropically distributed family found predominantly in rainforests, so they are megathermal taxa, whereas Rhamnaceae are a cosmopolitan family that tend to be found in xeric regions and may be classified as mesothermal. Phylogenetic ...
Boreotropics
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WebAug 21, 2024 · The ‘boreotropics hypothesis’ suggests that pantropical birds originated in the Laurasian forests. Extant parrots (Psittaciformes) are one the most species-rich pantropical avian clades, but their known evolutionary history does not fit a boreotropical origin. Most living parrots and the earliest diverging lineages of the Psittaciformes ... Webof legume taxa. The alternative boreotropics hypothesis (Wolfe, 1975; McKenna, 1983; Tiffney, 1985; Tiffney & Manchester, 2001) has been invoked as a more likely explanation for the dis-tribution patterns observed in some legume groups (e.g. Lavin & Luckow, 1993; Lavin etal., 2000). This hypothesis is based on
Boreotropical flora were plants that may have formed a belt of vegetation around the Northern Hemisphere during the Eocene epoch. These included forests composed of large, fast-growing trees (such as dawn redwoods) as far north as 80°N.
WebJan 27, 2024 · The family might have dispersed from Africa or India to Eurasia during the Paleocene-Eocene hothouse periods of frost-free and humid climate in Eurasia. The validation of boreo-tropical migration of Dipterocarpaceae requires the recovery of authentically identified dipterocarps from the early Paleogene of the boreotropics. Web(1 993) attributed to the Boreotropics Hypothesis, proposed by Wolfe (1 975) and Tiffney (1985a, b) to explain the distribution of the "boreotropical flora/'The hypothesis pro-poses …
Web2.9 Quantization of barotropic flow. In ocean dynamics, a barotropic flow is a flow whose density is a function of pressure only. In this understanding, the density of flow is …
WebEocene boreotropics hypothesis, which relies on the existence of extensive boreotropical forests during the Late Palaeocene-Early Eocene thermal maximum … saxon opticsWebA dated phylogeny of the palm tribe Chamaedoreeae supports Eocene dispersal between Africa, North and South America Argelia Cuenca a,*, Conny B. Asmussen-Lange a, Finn Borchsenius b a Department of Ecology, Faculty of Life Sciences, University of Copenhagen, Rolighedsvej 21, DK-1958 Frederiksberg C, Denmark b Department of … scaled with an exitWebin our new concept of Ardisia subg. Acrardisia.Jhis extension to the boreotropics hy-pothesis was cited by Wendt (1988, 1989, 1993), in discussing the relationships of Chiangiodendron (Flacourtiaceae),and by Zona (1990) in discussing the biogeography of Sabal (Arecaceae). A similar distribution for the genus Alstonia (Apocynaceae) was saxon oil companyWebThe nested phylogenetic position of the South American members of the genus within those from southern North America and Eurasia suggests that the boreotropics hypothesis best explains the amphi-Pacific tropical disjunct distribution occurring within section Valvatae. scaled wireWebMay 1, 2024 · Most members of the nymphalid subfamily Limenitidinae are distributed in tropical regions of Africa, Asia, and the Americas. Previous studies have inferred … scaled wolfWebNov 25, 2010 · Location Tropics and boreotropics. Methods Molecular age estimates were calculated using a Bayesian approach based on 83% generic sampling representing all major lineages within the family, seven chloroplast markers and two fossil calibrations. An analysis of diversification was carried out, which included lineage-through-time (LTT) … scaled white noiseWebJan 11, 2024 · The analyses revealed that the major coraciiform lineages originated on Laurasia about 57 million years ago. As the climate changed, the birds tracked the tropical conditions and forest habitats southwards, ending up in their current pantropical positions. These results support the Boreotropics hypothesis outlined above. scaled wings