Thesis (Ph. D.)--University of Hong Kong, 1988.

Thesis (M. Phil.)--University of Hong Kong, 1995. / Includes bibliographical references (leaves 123-126).

Thesis (Ph.D.)--University of Hong Kong, 1988. / Also available in print.

Since 2000, there has been a marked decline in the number of harbour seals in some regions around Britain; one possible contributing cause is competition for prey with sympatric grey seals. To explore one important aspect of this interaction, in this thesis the diet of harbour seals is estimated using analysis of hard prey remains recovered from faeces and compared with equivalent results for grey seals. To estimate coefficients to account for partial and complete digestion of hard prey remains, 100 whole prey feeding trials were conducted with six harbour seals and 18 prey species. Differences were found among prey species and between harbour and grey seals highlighting the importance of applying predator- and prey-specific digestion correction factors when reconstructing diet. In a comprehensive exploration of the diet of harbour seals around Britain, sandeel and flatfish dominated in the North Sea and large gadoids dominated on the Scottish west coast with seasonal pulses of pelagic prey. Variation in diet was linked to regional and seasonal differences in prey distribution and abundance. Sex-specific variation in harbour seal diet was examined in four regions. The main difference detected was in The Wash, where female diet quality was significantly higher than males in winter, which appeared to be driven by greater consumption of pelagic prey by female seals associated with seasonal energetic requirements of their annual life cycle. Comparison of the diet of harbour and grey seals revealed regional differences in diet composition, diversity and quality between the two species. However, there was no consistent pattern in this variation in relation to regional variation in harbour and grey seals population trajectories and no clear evidence for interspecific competition for prey. Future work should focus on an integrated investigation of prey abundance and distribution, and seal diet and foraging behaviour/distribution.

During the excavations of the City Park in Kalmar, Kalmar municipality, Småland, Sweden, in 2006 a quantity of approximately 100 kg of animal bones was excavated from the medieval settlement and harbour structures. These animal bones have been analysed and the results of the analysis will be discussed in the following paper. The purpose of the study was to identify what species is found and which parts of the body is represented in order to figure out the use and consumption of animals in the medieval city.  In the analysis several osteological methods- among these; age determination, sex determination and estimation of height have been used in order to compare the material from Kalmar to analysed osteological materials from other parts of Sweden. The result of the analysis showed the following species: cattle, sheep, goat, pig, horse, dog, cat, rat, hare, unspecified bird and unspecified fish. A pattern has been found in the location of different types of material indicating one building that was burnt down while storing several joints of meat, including for example spare ribs. In the area around the harbour several bones from phalanges and the cranial parts of cattle was identified, indicating an area of butchering or tannery activities.

In cases where human and wildlife are co-using the same geographical areas and resources, management issues often get complex and stakeholder conflicts are common. The Icelandic harbour seal (Phoca vitulina) population is rapidly decreasing, but direct culling of seals still occurs. At the same time seals are becoming an important resource due to increased interest in wildlife watching. Despite the complicated management situation, the Icelandic harbour seal population is one of the least studied pinniped populations in the world. Mapping the typical haul-out pattern is an important foundation for further studies. In paper I haul-out behaviour of harbour seals was investigated and a seasonal haul-out pattern was detected with the maximum number of seals hauling out during summer. A bimodal distribution curve was found during the summer time, suggesting that pupping period occurs in late May to early June, while moulting occurs in late July to early August. Tidal state, air-temperature and wind-speed affected the haul-out boots. Today, the main reason for culling harbour seals in Iceland is to reduce harbour seal predation on salmonids, despite limited knowledge on the effect of seal predation on salmonid populations and salmon angling. The diet of harbour seals that haul out in the estuary area of Bjargós and Ósar in NW-Iceland was therefore investigated using hard-part (paper II) and DNA metabarcoding analysis (paper III). Both methods showed that the main prey species were sand eels, flatfishes, gadoids, herring and capelin, while salmonids were not an important prey in this area. Based on these results, culling of harbour seals in the area is not likely to have a positive effect on salmonid angling. These results have crucial management implications, especially in the light of the severe decline in the Icelandic harbour seal population. Potential effects of seal watching tourism on the harbour seal population must also be considered in management plans. In paper IV, we investigated the effects of land based seal watching on seal behaviour and found that spatial distribution and vigilance was affected by tourists. Calm tourists behaviour had less effect, meaning that disturbance could be reduced if tourist behaviour is modified. In paper V, this line of investigation was followed by analysing knowledge transfer from academia to the tourist industry and a model was presented where a synergy effect of working interdisciplinary is hypothesised. Finally, in paper VI, the effect of signage on tourist behaviour was studied. Empirical testing showed that teleological information is more effective than ontological in terms of modifying general tourist behaviour. In this thesis, I present new knowledge on behaviour and diet of harbour seals, as well as new empirical findings on tourist behaviour in wildlife tourism settings. Further I explore interdisciplinary management approaches for seal watching tourism. The findings presented in this thesis have an important value within academic research in environmental-, life- and social sciences and the knowledge can be applied in several areas of harbour seal management in Iceland and elsewhere. / <p>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 6: Manuscript.</p>

Incidental catch (bycatch) in fisheries is one of the major threats to marine mammal populations worldwide. The harbour porpoise (Phocoena phocoena, Linneaus 1758) is one of the most common cetaceans in northern Europe. Previous studies have reported high bycatch numbers of harbour porpoises in gillnet fishing operations in the North Sea and Skagerrak Sea. With the aim of disentangling the driving factors behind bycatch of harbour porpoises, I looked at the relationship between occurrence of harbour porpoise bycatch and properties of fishery and porpoise density. Parameters of fishing effort, gear characteristics and operations of 951 sets of strings of cod and pollack bottom set gillnets were collected by an on-board observer programme in the Swedish Skagerrak and Kattegat Seas during 1995-1997. Porpoise density data was generated from satellite tracking locations of 116 individuals from 1997 to 2016. Generalised linear models with binomial distribution were applied to identify the relationships between the occurrence of porpoise bycatch and seven explanatory variables extracted as soak time, string length, net height, mesh size, net bagginess, water depth and porpoise density. During the observer programme, a total of 21 porpoises were bycaught during 10,174 km*h of observed fishing effort. The total bycatch was estimated to be 2.6% of the population abundance at that time, i.e. above the maximum sustainable total anthropogenic removal (1.7%). Soak time, string length and water depth were identified to be positively related to bycatch occurrence. The findings provide guidance for bycatch mitigation measures in terms of adjusting fishing operations, improving gear and establishing separate management units. Modelling can be used to predict possible spatio-temporal high-risk hot spots for harbour porpoise as well as other marine-living species to optimise future monitoring efforts.

This thesis consists of an exhibit, Cannery Days - A Chapter In The Life Of The Heiltsuk which opened at the University of British Columbia’s Museum of Anthropology (MOA) in May 1993, and a written paper which discusses the processes and political issues involved in doing an exhibit on a subject that is not only complex, but poorly understood by the general public. The context of the exhibit and this paper is the failure of non-Native society to understand that fish were and continue to be the economic wealth of B.C. First Nations. Within this context, the related issue of the invisibility of First Nations women and men in the fish-processing industry is addressed through the exhibit using quotes, photographs, and text. The exhibit and this subsequent paper grew out of concern and unease about how First Nations and their relationship with fish have traditionally been presented in academic literature. The purpose of this thesis is to tell how my knowledge of the traditional fisheries, and my experience in the fishing and fish-processing industries, in combination with my training in the discipline of anthropology has been put to use in preparing an exhibit to tell about Heiltsuk people and fish. It will discuss the exhibit as a medium or bridge which allowed me to illustrate this relationship without diminishing the lives and experiences of Heiltsuk people. Interviews with seventeen Heiltsuk women, four Heiltsuk men and one long-time employee of B.C. Packers open a window on a period of history which has not been well documented. To read conventional accounts of Native involvement in the fish-processing industry, their lives were grey and dreary. The exhibit reveals that for the people who lived and worked in Namu, it was not just a place to work, it had many meanings and warm memories. Stages of the exhibit development from concept through mounting are described. Although the entire project took longer than I had anticipated, the exhibit was more rewarding for me than a conventional written thesis. In following a strict ethical review process to ensure that the people had more control over the way their story is told, I was able to see the value of collaboration between myself, MOA and most importantly, Heiltsuk people. This is seen in the quality of the results and because it allows First Nations to work with non-Native professionals in ways which maintain dignity and respect on both sides. Through a museum exhibit, I found a way to present a First Nations perspective that provides balance to written accounts. By putting a human face on the relationship between First Nations and fish, my exhibit was able to reach a wider audience. The exhibit had two major themes; the continuing importance of fish to First Nations culture and economy and the pivotal role of Heiltsuk people in the development of the fish processing industry. I find that this paper also has two themes. The first is an examination of the value of exhibits like Cannery Days in allowing First Nations to tell their own story. The second is an examination of my ability to function as an anthropologist without losing my identity as a First Nations woman. The exhibit was well received by academics, First Nations and the museum public. This leads me to believe in the value of continuing fruitful collaboration between Native and non-Native researchers.

No description available.

[Truncated abstract] There is a well-documented global decline of seagrass meadows in response to anthropogenic pressures. Transplantation of rhizome fragments into denuded areas has been used to enhance natural recovery but nutrient limitation and poor root growth may contribute to low success rates. Addition of nutrients to sediments has been proposed as a means of enhancing growth and survival of seagrass transplants by alleviating nutrient limitation but there is limited information of the effects of nutrient additions to seagrass transplants, particularly root development and morphology. In addition to nutrient limitation, sulphide accumulation in sediments with high organic matter has been shown to reduce seagrass growth and experimental iron additions have been shown to enhance seagrass growth by buffering the development of reduced conditions in organic rich sediments. This thesis examines responses (growth, morphology and nutrient status) of Posidonia australis and Posidonia sinuosa transplants to nitrogen (N), phosphorus (P) and chelated iron (Fe EDTA) additions, and includes a detailed investigation of root growth and morphology in response to these additions. Experiments were carried out in underwater plots in Oyster Harbour, a sheltered estuarine inlet with seasonal river flow, located on the southern coast of Western Australia. In the first experiment, nutrients (N, P and N+P) and Fe EDTA were added to sediment underlying transplants at the end of summer (March 2005). ... Nitrogen (both N and N+P) addition also reduced overall biomass allocation to roots. Nitrogen concentrations increased with N addition in P. sinuosa only but both species had more negative d15N values with N and N+P addition indicating that added N had been taken up. In contrast, P addition had little effect on root growth, and P concentrations only increased in P. australis. However, tissue concentrations of Zn, Co, and Mo in both species increased with P addition. Roots showed limited morphological variation (total root length, mean root diameter, root fineness, specific root length, surface area) in response to nutrient addition. Combined N and P addition increased lateral root density (branches m-1) but had no effect on other morphological parameters of the root compartment. Iron addition had no effect on P. sinuosa but P. australis transplants significantly reduced root growth and productivity, particularly in spring/summer growth period, due to lower primary and lateral growth rates. Overall, N or P additions did not enhance growth although these nutrients were taken up. Iron additions also had little effect on transplant growth. Seagrass transplants had significant root growth although they appeared not to respond to nutrient or iron addition. Both species produced extensive root systems capable of taking up sediment nutrients, which suggests that root development was not a limiting factor in establishment and growth of transplants in the temperate estuary, Oyster Harbour.