Lars Chatrou | Wageningen University (original) (raw)
Papers by Lars Chatrou
East African rainforests are characterised by a high percentage of endemic species. Th e occurren... more East African rainforests are characterised by a high percentage of endemic species. Th e occurrence of Annonaceae in the area conforms to this pattern. We review the historical biogeography of species of this family endemic to East Africa ,
On the basis of molecular phylogenetics, pollen morphology and macromorphology, a new genus of th... more On the basis of molecular phylogenetics, pollen morphology and macromorphology, a new genus of the tribe Miliuseae, Hubera, segregrated from Polyalthia and allied to Miliusa, is established and described. It is characterized by the combination of reticulate tertiary venation of the leaves, axillary inflorescences, a single ovule per ovary and therefore single-seeded monocarps, seeds with a flat to slightly raised raphe, spiniform(-flattened peg) ruminations of the endosperm, and pollen with a finely and densely granular infratectum. Twenty-seven species are accordingly transferred to this new genus.
Perspectives in Plant Ecology, Evolution and Systematics, 2015
Ochnaceae is a pantropical family in the order Malpighiales. A recently published molecular phylo... more Ochnaceae is a pantropical family in the order Malpighiales. A recently published molecular phylogeny of the Ochnaceae identified three subfamilies, viz. Medusagynoideae, Quiinoideae and Ochnoideae. Clades within the latter are classified at tribal and subtribal level. The palaeotropical genus Campylospermum is placed in the tribe Ochneae, subtribe Ochninae, together with the genera Brackenridgea, Idertia, Ochna, Ouratea, and Rhabdophyllum. We reconstructed the phylogenetic relationships of the family using three chloroplast markers (matK, rbcL, trnLF) with intensified taxon sampling for the Ochninae, so as to focus on the relationships within this subtribe with special emphasis on the genus Campylospermum. Our Maximum likelihood and Bayesian analyses corroborate the phylogenetic backbone previously recognized while two clades could be distinguished within the genus Campylospermum. The first comprises the West/Central African Campylospermum species while the second includes the West...
The following Supporting Information is available for this article: Fig. S1 Majority-rule consens... more The following Supporting Information is available for this article: Fig. S1 Majority-rule consensus tree of BayesPhylogenies analysis with support values indicated next to nodes in posterior probability (pp).
The New phytologist, 2015
Tropical rainforest hyperdiversity is often suggested to have evolved over a long time-span (the ... more Tropical rainforest hyperdiversity is often suggested to have evolved over a long time-span (the 'museum' model), but there is also evidence for recent rainforest radiations. The mahoganies (Meliaceae) are a prominent plant group in lowland tropical rainforests world-wide but also occur in all other tropical ecosystems. We investigated whether rainforest diversity in Meliaceae has accumulated over a long time or has more recently evolved. We inferred the largest time-calibrated phylogeny for the family to date, reconstructed ancestral states for habitat and deciduousness, estimated diversification rates and modeled potential shifts in macro-evolutionary processes using a recently developed Bayesian method. The ancestral Meliaceae is reconstructed as a deciduous species that inhabited seasonal habitats. Rainforest clades have diversified from the Late Oligocene or Early Miocene onwards. Two contemporaneous Amazonian clades have converged on similar ecologies and high speciati...
East African rainforests are characterised by a high percentage of endemic species. Th e occurren... more East African rainforests are characterised by a high percentage of endemic species. Th e occurrence of Annonaceae in the area conforms to this pattern. We review the historical biogeography of species of this family endemic to East Africa ,
Kew Bulletin, 2015
A replacement generic name, Huberantha Chaowasku, is proposed for the recently described genus Hu... more A replacement generic name, Huberantha Chaowasku, is proposed for the recently described genus Hubera Chaowasku segregated from Polyalthia Blume because the name Hubera has been recommended to be treated as a later homonym of Huberia DC. (Melastomataceae) by the nomenclature committee for vascular plants. Consequently, new combinations of twenty-seven species presently recognised are made under Huberantha.
Climate Change, Ecology and Systematics, 2011
East African rainforests are characterised by a high percentage of endemic species. Th e occurren... more East African rainforests are characterised by a high percentage of endemic species. Th e occurrence of Annonaceae in the area conforms to this pattern. We review the historical biogeography of species of this family endemic to East Africa ,
ABSTRACT AnnonBase includes all published names of Annonaceae of any rank worldwide. The idea of ... more ABSTRACT AnnonBase includes all published names of Annonaceae of any rank worldwide. The idea of this development is to serve as a concise taxonomic backbone for basic as well as applied scientific studies. The AnnonBase source database also includes references to type material and their location of deposit. Future releases will include information on vernacular names, distributional data and links to relevant information sources. Database development and maintenance has been done at the University of Vienna funded by the Universities of Utrecht and Vienna and the European Commission
American Journal of Botany
Plastid matK gene sequences for 374 genera representing all angiosperm orders and 12 genera of gy... more Plastid matK gene sequences for 374 genera representing all angiosperm orders and 12 genera of gymnosperms were analyzed using parsimony (MP) and Bayesian inference (BI) approaches. Traditionally, slowly evolving genomic regions have been preferred for deep-level phylogenetic inference in angiosperms. The matK gene evolves approximately three times faster than the widely used plastid genes rbcL and atpB. The MP and BI trees are highly congruent. The robustness of the strict consensus tree supercedes all individual gene analyses and is comparable only to multigene-based phylogenies. Of the 385 nodes resolved, 79% are supported by high jackknife values, averaging 88%. Amborella is sister to the remaining angiosperms, followed by a grade of Nymphaeaceae and Austrobaileyales. Bayesian inference resolves Amborella ϩ Nymphaeaceae as sister to the rest, but with weak (0.42) posterior probability. The MP analysis shows a trichotomy sister to the Austrobaileyales representing eumagnoliids, monocots ϩ Chloranthales, and Ceratophyllum ϩ eudicots. The matK gene produces the highest internal support yet for basal eudicots and, within core eudicots, resolves a crown group comprising Berberidopsidaceae/Aextoxicaceae, Santalales, and Caryophyllales ϩ asterids. Moreover, matK sequences provide good resolution within many angiosperm orders. Combined analyses of matK and other rapidly evolving DNA regions with available multigene data sets have strong potential to enhance resolution and internal support in deep level angiosperm phylogenetics and provide additional insights into angiosperm evolution.
East African rainforests are characterised by a high percentage of endemic species. Th e occurren... more East African rainforests are characterised by a high percentage of endemic species. Th e occurrence of Annonaceae in the area conforms to this pattern. We review the historical biogeography of species of this family endemic to East Africa ,
On the basis of molecular phylogenetics, pollen morphology and macromorphology, a new genus of th... more On the basis of molecular phylogenetics, pollen morphology and macromorphology, a new genus of the tribe Miliuseae, Hubera, segregrated from Polyalthia and allied to Miliusa, is established and described. It is characterized by the combination of reticulate tertiary venation of the leaves, axillary inflorescences, a single ovule per ovary and therefore single-seeded monocarps, seeds with a flat to slightly raised raphe, spiniform(-flattened peg) ruminations of the endosperm, and pollen with a finely and densely granular infratectum. Twenty-seven species are accordingly transferred to this new genus.
Perspectives in Plant Ecology, Evolution and Systematics, 2015
Ochnaceae is a pantropical family in the order Malpighiales. A recently published molecular phylo... more Ochnaceae is a pantropical family in the order Malpighiales. A recently published molecular phylogeny of the Ochnaceae identified three subfamilies, viz. Medusagynoideae, Quiinoideae and Ochnoideae. Clades within the latter are classified at tribal and subtribal level. The palaeotropical genus Campylospermum is placed in the tribe Ochneae, subtribe Ochninae, together with the genera Brackenridgea, Idertia, Ochna, Ouratea, and Rhabdophyllum. We reconstructed the phylogenetic relationships of the family using three chloroplast markers (matK, rbcL, trnLF) with intensified taxon sampling for the Ochninae, so as to focus on the relationships within this subtribe with special emphasis on the genus Campylospermum. Our Maximum likelihood and Bayesian analyses corroborate the phylogenetic backbone previously recognized while two clades could be distinguished within the genus Campylospermum. The first comprises the West/Central African Campylospermum species while the second includes the West...
The following Supporting Information is available for this article: Fig. S1 Majority-rule consens... more The following Supporting Information is available for this article: Fig. S1 Majority-rule consensus tree of BayesPhylogenies analysis with support values indicated next to nodes in posterior probability (pp).
The New phytologist, 2015
Tropical rainforest hyperdiversity is often suggested to have evolved over a long time-span (the ... more Tropical rainforest hyperdiversity is often suggested to have evolved over a long time-span (the 'museum' model), but there is also evidence for recent rainforest radiations. The mahoganies (Meliaceae) are a prominent plant group in lowland tropical rainforests world-wide but also occur in all other tropical ecosystems. We investigated whether rainforest diversity in Meliaceae has accumulated over a long time or has more recently evolved. We inferred the largest time-calibrated phylogeny for the family to date, reconstructed ancestral states for habitat and deciduousness, estimated diversification rates and modeled potential shifts in macro-evolutionary processes using a recently developed Bayesian method. The ancestral Meliaceae is reconstructed as a deciduous species that inhabited seasonal habitats. Rainforest clades have diversified from the Late Oligocene or Early Miocene onwards. Two contemporaneous Amazonian clades have converged on similar ecologies and high speciati...
East African rainforests are characterised by a high percentage of endemic species. Th e occurren... more East African rainforests are characterised by a high percentage of endemic species. Th e occurrence of Annonaceae in the area conforms to this pattern. We review the historical biogeography of species of this family endemic to East Africa ,
Kew Bulletin, 2015
A replacement generic name, Huberantha Chaowasku, is proposed for the recently described genus Hu... more A replacement generic name, Huberantha Chaowasku, is proposed for the recently described genus Hubera Chaowasku segregated from Polyalthia Blume because the name Hubera has been recommended to be treated as a later homonym of Huberia DC. (Melastomataceae) by the nomenclature committee for vascular plants. Consequently, new combinations of twenty-seven species presently recognised are made under Huberantha.
Climate Change, Ecology and Systematics, 2011
East African rainforests are characterised by a high percentage of endemic species. Th e occurren... more East African rainforests are characterised by a high percentage of endemic species. Th e occurrence of Annonaceae in the area conforms to this pattern. We review the historical biogeography of species of this family endemic to East Africa ,
ABSTRACT AnnonBase includes all published names of Annonaceae of any rank worldwide. The idea of ... more ABSTRACT AnnonBase includes all published names of Annonaceae of any rank worldwide. The idea of this development is to serve as a concise taxonomic backbone for basic as well as applied scientific studies. The AnnonBase source database also includes references to type material and their location of deposit. Future releases will include information on vernacular names, distributional data and links to relevant information sources. Database development and maintenance has been done at the University of Vienna funded by the Universities of Utrecht and Vienna and the European Commission
American Journal of Botany
Plastid matK gene sequences for 374 genera representing all angiosperm orders and 12 genera of gy... more Plastid matK gene sequences for 374 genera representing all angiosperm orders and 12 genera of gymnosperms were analyzed using parsimony (MP) and Bayesian inference (BI) approaches. Traditionally, slowly evolving genomic regions have been preferred for deep-level phylogenetic inference in angiosperms. The matK gene evolves approximately three times faster than the widely used plastid genes rbcL and atpB. The MP and BI trees are highly congruent. The robustness of the strict consensus tree supercedes all individual gene analyses and is comparable only to multigene-based phylogenies. Of the 385 nodes resolved, 79% are supported by high jackknife values, averaging 88%. Amborella is sister to the remaining angiosperms, followed by a grade of Nymphaeaceae and Austrobaileyales. Bayesian inference resolves Amborella ϩ Nymphaeaceae as sister to the rest, but with weak (0.42) posterior probability. The MP analysis shows a trichotomy sister to the Austrobaileyales representing eumagnoliids, monocots ϩ Chloranthales, and Ceratophyllum ϩ eudicots. The matK gene produces the highest internal support yet for basal eudicots and, within core eudicots, resolves a crown group comprising Berberidopsidaceae/Aextoxicaceae, Santalales, and Caryophyllales ϩ asterids. Moreover, matK sequences provide good resolution within many angiosperm orders. Combined analyses of matK and other rapidly evolving DNA regions with available multigene data sets have strong potential to enhance resolution and internal support in deep level angiosperm phylogenetics and provide additional insights into angiosperm evolution.