The ubiquity and importance of parasite co-infections in populations of free-living animals is beginning to be recognized, but few studies have demonstrated differential fitness effects of single infection versus co-infection in free-living populations. We investigated interactions between the emerging bacterial disease bovine tuberculosis (BTB) and the previously existing viral disease...
The stochastic and the Fourier theories for sand waves developed
by Lee(11) and Hino(6), respectively, for unidirectional flows are
extended in order to estimate the rate of sediment turnover (RST) under
oscillatory flows in the South Slough estuary, Coos Bay, Oregon. Data
were collected by a mechanical and a sonic...
Auparavant le secteur des pêches ne s’intéressait guère qu’aux ressources et aux captures. Nos spécialités étaient des biologistes, des techniciens des pêches ; nos administrations de tutelle étaient celles des marins pêcheurs, nos recherches étaient essentiellement orientées vers la biologie des espèces, l’environnement de leur habitat, les modèles de gestion...
Soils representative of several landscape units in the H. J.
Andrews Experimental Forest, Western Cascade Range, were sampled,
analyzed, and tentatively classified. Genetic inferences were
drawn relating soils to landscape position and other factors of soil
formation. Descriptive information and nutrient capital data were
provided to support ecosystem modelling efforts...
Modern agricultural erosion was studied using ¹³⁷Cs from
fallout as an indicator of erosion/deposition. The study area was a
285 ha agricultural watershed in the hilly western margin of the
Willamette Valley, a high winter rainfall zone in which fall-planted
crops are commonly grown.
Objectives of the study were (i)...
Bats possess arrays of distributed ow-sensitive hair-like mechanoreceptors on their dorsal and ventral wing surfaces. It is generally hypothesized that the hair sensor array provides air ow feedback during ight. Speci cally, the sensing of leading and trailing edge vortices that are shed during apping ight has been proposed. In...
A graph fold is the special case of a graph homomorphism where the two identified vertices are both adjacent to a common vertex. Like homomorphisms, folds are related to the chromatic number and we obtain an Interpolation Theorem for folds. If X(G) = n, then G is absolutely n-chromatic if...