Thesis (Ph. D.)--Swedish University of Agricultural Sciences, 2003. / Includes bibliographical references (leaves 30-34).

Thesis (Ph.M.)--University of Wisconsin--Madison, 1946. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (Ph. D.)--Swedish University of Agricultural Sciences, 2003. / Includes bibliographical references (p. 25-28).

Thesis (doctoral)--Swedish University of Agricultural Sciences, 2006. / Thesis documentation sheet inserted. Appendix includes reproductions of four papers and manuscripts, three co-authored with others. Includes bibliographical references. Also issued electronically via World Wide Web in PDF format; online version lacks appendix of papers.

Diss.--Oulun yliopisto, 2000. / Includes bibliographical references (p. [56]-64). Also available online.

A study of the growth of reindeer (Rangifer tarandus) was carried out during the spring and summer of 1958 in the Mackenzie Delta, N.W.T. Growth rates were obtained for four fawns over this period. Their growth is described by Brody's equation and the von Bertalanffy equation. The rate of growth of reindeer fawns is slightly less than that of the Columbian Black-tailed Deer, whereas the birth weight of the reindeer is double that of the Black-tailed Deer. A description of the relative growth of several body measurements is given. Hind foot length, heart girth, height-at-withers, muzzle circumference, and antler length were measured. The measurement error of height-at-withers and muzzle circumference limits the usefulness of this data. The changes in herd numbers and composition of the Mackenzie Delta Reindeer Herd over the period 1938-1958 are analyzed. Of the three population determining factors (natality, mortality, and dispersal), dispersal (losses by straying) was by far most important and natality (number of fawns) was least important in determining the total annual increment to the herd over the period 1938-1958. The age distribution of the herd over the period 1938-1958 has been relatively stable. / Science, Faculty of / Zoology, Department of / Graduate

Thesis (Ph. D.)--Cambridge University. / "Max Planck Institute for Social Anthropology"--Cover. Includes bibliographical references (p. [245]-271.

Reindeer is an important factor influencing species composition and functions in Arctic ecosystems. However, our understanding of how the importance of reindeer varies among ecosystems is still limited. The aim of this study was to investigate how the vegetation has changed between 1995 and 2015 with and without large herbivores in an area with low herbivory. The study was conducted on Fulufjället in the Swedish mountain region. 16 plots were used, half of which excluded reindeer through fences. The effects of herbivory were generally quite small, which was expected since the density of reindeer is low in the area. However, crowberry (Empetrum nigrum) thrived better in the exclosures than in the grazed controls. In addition to that, the abundance of almost half of the investigated species had changed between 1995 and 2015, regardless of exclusion. Cladonia mitis, Schreber’s big red stem moss (Pleurozium schreberi) and common heather (Calluna vulgaris) were more abundant in 2015, while crowberry was less abundant in 2015. The report concludes that reindeer grazing has small but detectable effects on the vegetation in Fulufjället, and that substantial vegetation changes have occurred during the last 20 years, but that these changes cannot easily be explained by recent climate or land use changes.

By definition, parasites are expected to have fitness consequences for their hosts by reducing survival and fecundity. If such events are density dependent they may play a regulatory role in their host's dynamics. However, there are few studies in the wild that provide empirical evidence to support these suppositions. To understand the impact of parasites it is necessary to explore the interactions between parasite and host and the mechanisms that regulate nematode populations. The aims of this work are to: 1) identify the species specific patterns of infection; 2) investigate the interactions between and within nematode species and 3) examine the regulatory mechanisms that control nematode fecundity. The distribution of parasites between hosts and the variation between years, seasons, reindeer age and location are also examined. Nematode infections of Svalbard reindeer are dominated by two species: Ostertagia gruehneri and Marshallagia marshalli and their contrasting life-histories and population dynamics highlights the importance of investigating at the level of individual species. For 0. gruehneri, there is significant annual variation but no strong seasonal pattern in abundance. Susceptible calves do not acquire infection until their second summer. Egg output is highly seasonal with a peak in July and controlled through density dependent effects on worm development. In contrast M marshalli, shows a strong seasonal cycle which does not vary between years and the peak occurs in late winter suggesting winter transmission. Egg output is low and also confined to the winter months. The quantification of these traits is important in allowing parameterisation of models with data from the study system. In many studies parameters are estimated from studies of domestic host parasite systems and these may be inappropriate in this natural system. The role of immunity and arrested development and the relationship between transmission and environmental heterogeneity are discussed.

No description available.