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The Swimming and Jumping Ability of Three Small Great Plains Fishes: Implications for Fishway Design
Based on swimming trial results, current velocities in fishways should not exceed 64 cm/s for brassy minnow or common shiners and 32 cm/S for Arkansas darters, and jumping experiments showed that the presence of a low vertical barrier dramatically reduced the probability of upstream movement of these fishes.
Todea from the Lower Cretaceous of western North America: implications for the phylogeny, systematics, and evolution of modern Osmundaceae.
Fossil evidence confirms that Osmundaceae originated in the Southern Hemisphere during the Permian, underwent rapid diversification, and species extended around the world during the Triassic, and that the genus Todea evolved by the Lower Cretaceous.
First North American fossil monkey and early Miocene tropical biotic interchange
Discovery of an early Miocene primate in Panama provides evidence for a circum-Caribbean tropical distribution of New World monkeys by this time, with ocean barriers not wholly restricting their northward movements, requiring a complex set of ecological factors to explain their absence in well-sampled similarly aged localities at higher latitudes of North America.
A framework for evaluating the influence of climate, dispersal limitation, and biotic interactions using fossil pollen associations across the late Quaternary
A framework for assessing causes of species associations is provided by combining a null-model analysis of co-occurrence with additional analyses of climatic differences and spatial pattern for pairs of pollen taxa that are significantly associated across geographic space.
Holocene shifts in the assembly of plant and animal communities implicate human impacts
Evaluating changes in plant and animal community organization over geological time by quantifying the co-occurrence structure of 359,896 unique taxon pairs in 80 assemblages spanning the past 300 million years suggests that the rules governing the assembly of communities have been changed by human activity.
Pennsylvanian coniferopsid forests in sabkha facies reveal the nature of seasonal tropical biome
Pennsylvanian fossil forests are known from hundreds of sites across tropical Pangea, but nearly all comprise remains of humid Coal Forests. Here we report a unique occurrence of seasonally dry…
Fossil evidence for a herbaceous diversification of early eudicot angiosperms during the Early Cretaceous
- N. Jud
- Biology, MedicineProceedings of the Royal Society B: Biological…
- 7 September 2015
A mostly herbaceous initial diversification of eudicots could simultaneously explain the heretofore sparse megafossil record as well as their rapid diversification during the Early Cretaceous because the angiosperm capacity for fast reproduction and fast evolution is best expressed in herbs.
Fossil moonseeds from the Paleogene of West Gondwana (Patagonia, Argentina).
The fossil record does not discern between a Laurasian or Gondwanan origin; however, it does demonstrate that Menispermaceae grew well outside the tropics by the early Paleocene.
Flowering after disaster: Early Danian buckthorn (Rhamnaceae) flowers and leaves from Patagonia
These fossils provide the first unequivocal megafossil evidence of Rhamnaceae in the Southern Hemisphere, demonstrating that RhamNaceae expanded beyond the tropics by the earliest Paleocene.
Fruits and wood of Parinari from the early Miocene of Panama and the fossil record of Chrysobalanaceae.
Fossil endocarps from the Cucaracha, Culebra, and La Boca Formations confirm that Parinari was present in the neotropics by the early Miocene and show the earliest unequivocal evidence of crown-group Chrysobalanaceae.