The Chao species richness estimator estimated species richness of the focal bee taxa at 800 m elevation to be 33.12 ± 8.92 species, 27.00 ± 3.35 species at 900 m elevation, 24.72 ± 2.86 species , Читать книгу «Darwin, and After Darwin (Vol. 1 and 3, of 3) / An Exposition of the Darwinian Theory and a Discussion of / Post-Darwinian Questions» автора George John Romanes онлайн бесплатно и без регистрации. Текст книги в удобном формате на сайте Яндекс Книги., The Betulaceae consist of monoecious trees or shrubs. The leaves are simple, deciduous, usually spiral, caducous-stipulate, with the margin usually toothed. The inflorescences are unisexual, the male inflorescence is a pendulous catkin, the female inflorescence a short, pendulous or erect catkin, both bearing numerous, 1–3-flowered, bracteate, simple dichasia., Get the app. Country. United States; Canada; United Kingdom; Australia; New Zealand; Germany; France, The only extant member is the great white shark (Carcharodon carcharias). Extinct species include C. hubbelli and C. hastalis. [ 3 ] The first appearance of the genus may have been as early as the Early Miocene or Late Oligocene . [ 1 ], .