Latitudinal distribution, calf growth and metabolism, and reproductive energetics of gray whales, Eschrichtius robustus Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8w32r811m

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  • Gray whales accomplish an annual migration which spans as much as 50° of latitude in the northeast Pacific Ocean. This migration links their summer high latitude feeding grounds with winter calving and breeding areas. The purpose of this study was to determine how adult females apportion their stored lipid reserves while away from their principal feeding areas to accommodate their own maintenance and locomotory needs while developing a fetus and transferring energy through lactation to support growth and maintenance of their calves. Major components of this study included examinations of migratory swimming speeds and costs of transport, of calf growth and mortality rates, of metabolic and heat loss rates, of summer distribution patterns, and of the magnitudes and utilization rates of maternal lipid reserves. The results of this study support the conclusions of other investigations that calf heat losses are similar to minimum observed metabolic rates, and that maintenance and lactation costs can be accommodated without winter feeding by all but the small adult females. It is suggested that present oceanographic conditions in the North Pacific Ocean support a larger gray whale population and allow very different gray whale feeding and migrating patterns than existed during the last glacial maximum.
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  • File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Submitted by Kevin Martin (martikev@onid.orst.edu) on 2012-02-29T21:10:47Z No. of bitstreams: 1 SumichJamesL1986.pdf: 3772036 bytes, checksum: b9c9710801fdede9916525f5e79b334c (MD5)
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  • description.provenance : Submitted by Kevin Martin (martikev@onid.orst.edu) on 2011-12-16T22:56:02Z No. of bitstreams: 1 SumichJamesL1986.pdf: 2220729 bytes, checksum: ec85db7be993e9c732be3b21aab9e6ad (MD5)
  • description.provenance : Made available in DSpace on 2012-02-29T21:34:26Z (GMT). No. of bitstreams: 1 SumichJamesL1986.pdf: 3772036 bytes, checksum: b9c9710801fdede9916525f5e79b334c (MD5) Previous issue date: 1986-03-18
  • description.provenance : Rejected by Patricia Black(patricia.black@oregonstate.edu), reason: Grayscale. on 2012-02-27T16:26:42Z (GMT)

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