Hoarding in four southern African rodent species

The comparative hoarding behaviour of four rodent species,Saccostomus campeslris, Desmodillus auricularis. Tatera brantsii and T. leucogaster was studied under semi-natural conditions after prior determination of the seed preferences of each species.The results are consistent with all available ecological data.  Desmodillus  and Saccostomus are true larder-hoarders, although Desmodillus also scatter-hoards on occasion. The Tatera spp. did not hoard, but frequently covered seeds, a possible primitive form of scatter-hoarding

The helminth fauna of the digestive tracts of chacma baboons, Papio ursinus, from different localities in the Transvaal

All of the 111 baboons examined from the Loskop Dam, Suikerbosrand and Scrutton Nature Reserves and the Sabie-Tweefontein Forest Reserve were infested with helminths of the digestive tract. The helminths recovered were Bertiella studeri, Enterobius vermicularis, Oesophagostomum bifurcum, Physaloptera caucasica, Streptopharagus pigmentatus, Strongyloides fülleborni, Trichostrongylus falculatus, Trichuris trichiura and females of Trichuris which possibly belong to a new species. Most baboons harboured 3, and some as many as 6, species of helminths. Burdens of the various helminths varied greatly, even among baboons from the same locality, age group and sex. All helminths found in the present study can occur in very young animals. Worm burdens generally increased as the host aged, with a subsequent decrease among adult baboons for Enterobius vermicularis, Strongyloides fülleborni and Trichostrongylus falculatus. Heavier worm burdens were found in the wet season for Bertiella studeri and Oesophagostomum bifurcum, whereas Trichostrongylus falculatus occurred in greater numbers during the dry season. No significant differences between worm burdens in male and female baboons were found, but Physaloptera caucasica was more prevalent in males. Trichostrongylus falculatus and Enterobius vermicularis are new records for the chacma baboon.The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.am201

The effect of the annealing temperature on the local distortion of La0.67_{0.67}Ca0.33_{0.33}MnO3_3 thin films

Mn $K$-edge fluorescence data are presented for thin film samples (3000~\AA) of Colossal Magnetoresistive (CMR) La$_{0.67}$Ca$_{0.33}$MnO$_3$: as-deposited, and post-annealed at 1000 K and 1200 K. The local distortion is analyzed in terms of three contributions: static, phonon, and an extra, temperature-dependent, polaron term. The polaron distortion is very small for the as-deposited sample and increases with the annealing temperature. In contrast, the static distortion in the samples decreases with the annealing temperature. Although the local structure of the as-deposited sample shows very little temperature dependence, the change in resistivity with temperature is the largest of these three thin film samples. The as-deposited sample also has the highest magnetoresistance (MR), which indicates some other mechanism may also contribute to the transport properties of CMR samples. We also discuss the relationship between local distortion and the magnetization of the sample.Comment: 11 pages of Preprint format, 8 figures in one tar fil