Graduate Thesis Or Dissertation
 

Development of the fisheries of the Eastern North Pacific : a natural-cultural systems perspective

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  • The eastern margin of the Eastern North Pacific Ocean was classified into physiographic regions based on a suite of physical characteristics. Information on cultural and biological characteristics of this area was meshed with this classification. The result was a classification of the Eastern North Pacific into natural-cultural systems whose boundaries coincide with those of physiographic regions. Development of commercial fisheries was examined in three selected natural-cultural systems over a span of 88 years in order to identify developmental patterns unique to each and similar in all systems. Life history patterns of selected species were also examined within the context of characteristics of natural and cultural systems of the Eastern North Pacific. Species life history patterns have developed within, and therefore may tend to correlate with, general patterns in physical environment as they occur in different areas in the Eastern North Pacific. Yet life history patterns are also affected by cultural factors like exploitation and habitat destruction. Like life history patterns, fisheries also have developed differently in each natural-cultural system in the Eastern North Pacific due to differences in many interacting physical, cultural, and biological characteristics. Differences in fishery development between systems include management and exploitation techniques and technology, but also include characteristics of catch such as taxonomic composition and trophic composition, and distance from shore from which the majority of the catch came. Yet there were also similarities in patterns of fishery development between different natural-cultural systems. A `fishing up' process occurred in each natural-cultural system examined, along with declines in catch of most species that maintained a high value. Shifts in trophic structure of the catch occurred, with movement toward proportionally greater landing weights of species of lower trophic groups. Implications of such generalized patterns of exploitation and of fishery development for species life histories and for fish communities are discussed, and several management measures are suggested.
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Déclaration de droits
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  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
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