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Movements, nesting, and response to anthropogenic disturbance of Marbled Murrelets (Brachyramphus marmoratus) in Redwood National and State Parks, California.

File Language:
English


Details

  • Creators:
  • Corporate Creators:
    Humboldt State University. Dept. of Wildlife
  • Subject/TRT Terms:
  • Publication/ Report Number:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    California
  • Corporate Publisher:
    California. Department of Transportation
  • Abstract:
    During three nesting seasons a total of 102 marbled murrelets (Brachyramphus marmoratus) were captured on the ocean off

    northern California and had radio transmitters attached. Reproductive success varied between years, and the average reproductive success

    was 6.9-13.5%, depending on assumptions in the calculations. Most nest failures occurred early in incubation. Predation by corvids was

    implicated as a major source of nest failure.

    When nests were exposed to disturbance in form of sound from an operating chainsaw, neither incubating adults or chicks flushed

    from the nest. The proportion of resting behavior was significantly less when the saw was operating than before or after. Reproductive

    success was not reduced when nests were exposed to the sound disturbance. No correlation was found between nest success and distance

    from roads or trails. However, there was a potential for indirect effects of longer-term noise (greater than 15 minutes) due to potential

    attraction of corvids.

    Murrelets that were feeding chicks flew inland later in the morning than other inland flying murrelets. Only chick-feeding

    murrelets flew inland in the evening. Murrelets whose breeding attempts failed still continued to fly inland. At one nest equipped with

    a persistent video, murrelets nested at the same location on the platform for five years, but lost their eggs to Steller’s Jays or Ravens

    in 3 of 5 years

  • Format:
    PDF
  • Funding:
    43A0068.41
  • Collection(s):
  • Main Document Checksum:
    urn:sha256:8e4105f091c83dc9abe1ec04946d09b7c6b7b1fd343e08be8cf2ab30225d6789
  • Download URL:
  • File Type:
    Filetype[PDF - 2.75 MB ]
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