Rate-limiting steps in the dark-to-light transition of Photosystem II (PSII) were discovered by measuring the variable chlorophyll-a fluorescence transients elicited by single-turnover saturating flashes (STSFs). It was shown that in diuron-treated samples: (i) the first STSF, despite fully reducing the QA quinone acceptor molecule, generated only an F1(
- Klíčová slova
- chlorophyll-a fluorescence, conformational changes, dielectric relaxation, light-adapted charge-separated state of PSII, rate-limitation, temperature-dependence, waiting time,
- MeSH
- chlorofyl a MeSH
- chlorofyl MeSH
- diuron * farmakologie MeSH
- fotosystém II - proteinový komplex * MeSH
- seznamy čekatelů MeSH
- světlo MeSH
- teplota MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- chlorofyl a MeSH
- chlorofyl MeSH
- diuron * MeSH
- fotosystém II - proteinový komplex * MeSH
A new species, Vetubrachypsectra huchengi Li, Kundrata & Cai sp. nov., is described from mid-Cretaceous Burmese amber on the basis of a single adult female. The species is assigned to genus Vetubrachypsectra Qu & Cai based on its serrate antennae, long maxillary palps, presence of tibial spurs, and elytra without clear striae. Vetubrachypsectra huchengi differs distinctly from V. burmitica Qu & Cai, the only other species in the genus, in having the pedicel apically attached to the scape. Some other differences between the female of V. huchengi and the male of V. burmitica include less serrate antennae, a broader pronotal disc, a broader scutellar shield and smaller tibial spurs. However, at least some of these characters can be considered sexually dimorphic.
- Klíčová slova
- Brachypsectridae, Burmese amber, Elateroidea, sexual dimorphism,
- Publikační typ
- časopisecké články MeSH
The morphology of the Jurassic fossil Archaeolus funestus Lin, 1986, which was previously placed in the extinct click-beetle subfamily Protagrypninae (Coleoptera: Elateridae), is revised based on a re-examination of the type specimen. The validity of Protagrypninae is discussed and further questioned, partly based on the newly observed characters in A. funestus, including the surface sculpture of the mesoventrite. A possible Throscidae affinity of monotypic Archaeolus Lin, 1986, as suggested in a recent study, is further critically reviewed.
- Klíčová slova
- Archaeolus, Elateroidea, Mesozoic, Protagrypninae, Throscidae,
- Publikační typ
- časopisecké články MeSH
Climate is widely recognised as an important determinant of the latitudinal diversity gradient. However, most existing studies make no distinction between direct and indirect effects of climate, which substantially hinders our understanding of how climate constrains biodiversity globally. Using data from 35 large forest plots, we test hypothesised relationships amongst climate, topography, forest structural attributes (stem abundance, tree size variation and stand basal area) and tree species richness to better understand drivers of latitudinal tree diversity patterns. Climate influences tree richness both directly, with more species in warm, moist, aseasonal climates and indirectly, with more species at higher stem abundance. These results imply direct limitation of species diversity by climatic stress and more rapid (co-)evolution and narrower niche partitioning in warm climates. They also support the idea that increased numbers of individuals associated with high primary productivity are partitioned to support a greater number of species.
- Klíčová slova
- CTFS-ForestGEO, Climate tolerance hypothesis, latitudinal diversity gradient, more-individuals hypothesis, species-energy relationship, structural equation modelling,
- MeSH
- biodiverzita * MeSH
- podnebí MeSH
- stromy * MeSH
- Publikační typ
- dopisy MeSH
