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USING STABLE ISOTOPES TO ASSESS THE POPULATION STRUCTURE AND FEEDING ECOLOGY OF NORTH PACIFIC HUMPBACK WHALES (MEGAPTERA NOVAEANGLIAE)
Title
USING STABLE ISOTOPES TO ASSESS THE POPULATION STRUCTURE AND FEEDING ECOLOGY OF NORTH PACIFIC HUMPBACK WHALES (MEGAPTERA NOVAEANGLIAE).
Creator
Witteveen, Briana, Worthy, Graham, University of Central Florida
Abstract / Description
The North Pacific humpback whale (Megaptera novaeangliae) is a wide-ranging baleen whale species with a complex life history and population structure. As seasonal migrants, humpback whales are known to inhabit cooler, high-latitude waters when foraging and low-latitudes for mating and calving. Beyond this general migratory pattern, a number of demographic characteristics including, abundance, distribution, seasonal occurrence, and prey preferences remain unknown or poorly described. A...
Show moreThe North Pacific humpback whale (Megaptera novaeangliae) is a wide-ranging baleen whale species with a complex life history and population structure. As seasonal migrants, humpback whales are known to inhabit cooler, high-latitude waters when foraging and low-latitudes for mating and calving. Beyond this general migratory pattern, a number of demographic characteristics including, abundance, distribution, seasonal occurrence, and prey preferences remain unknown or poorly described. A complete understanding of humpback whale ecology is therefore lacking. Many methods used to explore these aspects of cetacean ecology are either prohibitively expensive or limited in the scope of what can be learned from their use. Fortunately, in recent years, the analysis of stable isotope ratios of animal tissues has proved a valuable and relatively inexpensive technique for providing information on trophic position, diet, and feeding origins of migratory populations. This study employed techniques in stable isotope ecology to increase knowledge of the population structure, migration routes, and foraging ecology of North Pacific humpback whales. Skin samples were collected from free-ranging humpback whales throughout all known feeding and breeding grounds and were analyzed for stable carbon (13C) and nitrogen (15N) isotope ratios. The population structure of humpback whales was first explored through geographic differences in stable isotope ratios. Stable isotope ratios varied significantly with location of sample collection. Based on this analysis, foraging animals were separated into six feeding groups. Classification tree analysis was then used to determine which isotopic variables could be used to predict group membership. Probable migratory linkages were then described by applying results of classification trees to 13C and 15N of animals sampled on breeding grounds. Strong migratory connections between the eastern-most foraging and breeding areas and the western-most areas were reflected in similarities of stable isotope ratios. Foraging ecology was then examined through calculation and comparison of the relative trophic levels of the six feeding groups. Isotopic values suggest some feeding groups are piscivorous, while others feed on a more mixed diet. These results can be used to determine if differences in diet composition between groups result in differences in accrued nutritional benefits, negatively impacting reproductive success and survival relative to fish eating groups. Finally, to gain insight into specific foraging habits, the diet of one group of humpback whales was modeled using an isotope mixing model. The 13C and 15N of Kodiak Island, Alaska humpback whales and several species of potential prey indicate that these animals likely rely heavily on euphausiids (Thysanoessa spinifera), Pacific sandlance (Ammodytes hexapterus), and capelin (Mallotus villosus). This study represents the first application of stable isotope ecology to an entire population of marine mammals. Stable isotope analysis was successfully applied to describe and improve understanding of the demographics of North Pacific humpback whales.
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Date Issued
2008
Identifier
CFE0002386, ucf:47774
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0002386
Becoming a Food Citizen: Can Eco-Citizens Realize Their Obligations to Sustainable Consumption Given the Confines of the Globalized Fish Market?
Title
Becoming a Food Citizen: Can Eco-Citizens Realize Their Obligations to Sustainable Consumption Given the Confines of the Globalized Fish Market?.
Creator
Hornung, Nicole, Jacques, Peter, Kiel, Dwight, Morales, Waltraud, University of Central Florida
Abstract / Description
Environmental citizenship is positioned as a platform where the rights of social and environmental justice converge with civic engagement and responsibility. As industrialized economies continue to exhaust the limits of finite natural resources and exacerbate conditions of global climate change, scholars have questioned if environmental citizenship models offer a method for deepening obligations to a sustainable movement. In the material culture enjoyed by Western civilizations, existing...
Show moreEnvironmental citizenship is positioned as a platform where the rights of social and environmental justice converge with civic engagement and responsibility. As industrialized economies continue to exhaust the limits of finite natural resources and exacerbate conditions of global climate change, scholars have questioned if environmental citizenship models offer a method for deepening obligations to a sustainable movement. In the material culture enjoyed by Western civilizations, existing research supports that an individual's purchases are seen as an indicator of their values and identities. Consequently the commitment to responsible buying behavior or sustainable consumption is in a sense an expression of eco-citizenship. My thesis offers a critical perspective of Andrew Dobson's ecological citizenship theory, by asking how sustainable consumption can be conceptualized in the existing political and economic infrastructures. Using a thorough case study of globally traded fish provisions, I investigate the existing barriers for eco-citizens attempting to realize their obligations to sustainable consumption. This analysis allows me to draw conclusions on how these barriers may inhibit eco-citizenship theories and ultimately a sustainable social movement. The structure of this thesis is broken into three parts. First, I define existing theories of ecological citizenship and sustainable consumption, including the theoretical propositions, requirements, and limitations. Secondly, I rely on Dobson's conception of ecological citizenship and an instrumental case study of Pacific Salmon provisions to illustrate the barriers eco-citizens encounter in the current market and regulatory system. Finally, this paper concludes by proposing individual and institutional changes that will assist in fostering an eco-citizen community and the contribution my findings may have on existing green citizenship research.?
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Date Issued
2013
Identifier
CFE0004692, ucf:49864
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0004692
Settlement History and Interaction in the Manialtepec Basin of Oaxaca's Central Coast
Title
Settlement History and Interaction in the Manialtepec Basin of Oaxaca's Central Coast.
Creator
Menchaca, Victoria, Barber, Sarah, Walker, John, Chase, Arlen, University of Central Florida
Abstract / Description
As the focus of over 70 years' of archaeological research, Oaxaca, Mexico, is one of Mesoamerica's best understood regions. Yet, despite the volume of work in Oaxaca, information about one of its key resource areas, the central Pacific coast, remains limited. Specifically, the ambiguous role of Oaxaca's Central Coast in interregional relationships during pre-Hispanic times to the sites of Monte Alb(&)#225;n and Tututepec has been a chronic problem and major source of debate for decades. The...
Show moreAs the focus of over 70 years' of archaeological research, Oaxaca, Mexico, is one of Mesoamerica's best understood regions. Yet, despite the volume of work in Oaxaca, information about one of its key resource areas, the central Pacific coast, remains limited. Specifically, the ambiguous role of Oaxaca's Central Coast in interregional relationships during pre-Hispanic times to the sites of Monte Alb(&)#225;n and Tututepec has been a chronic problem and major source of debate for decades. The purpose of this thesis is to begin clarifying the role of Oaxaca's Central Coast in interregional networks and its pre-Hispanic history. Analysis utilized surface observations, surface collections, and information from limited excavations performed by the Proyecto Arqueol(&)#243;gico Laguna de Manialtepec (PALM) in the Manialtepec Basin, located on the Central Coast of Oaxaca. The data was then mapped using ArcGIS software to render settlement and artifact patterns. Based on the results of this project I suggest a history of settlement for this area. I also argue that the Basin contained three centers, maintained interregional interactions, and was invaded by the Mixtecs of highland Oaxaca during the Late Postclassic Period (A.D. 1200-1500).
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Date Issued
2015
Identifier
CFE0005843, ucf:50920
Format
Document (PDF)
PURL
http://purl.flvc.org/ucf/fd/CFE0005843