Timescales alter the inferred strength and temporal consistency of intraspecific diet specialization Public Deposited

http://ir.library.oregonstate.edu/concern/articles/x346d631p

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Springer and can be found at:  http://link.springer.com/journal/442

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Many populations consist of individuals that differ substantially in their diets. Quantification of the magnitude and temporal consistency of such intraspecific diet variation is needed to understand its importance, but the extent to which different approaches for doing so reflect instantaneous vs. time-aggregated measures of individual diets may bias inferences. We used direct observations of sea otter individuals (Enhydra lutris nereis) to assess how: (1) the timescale of sampling, (2) under-sampling, and (3) the incidence-vs. frequency-based consideration of prey species affect the inferred strength and consistency of intraspecific diet variation. Analyses of feeding observations aggregated over hourly to annual intervals revealed a substantial bias associated with time aggregation that decreases the inferred magnitude of specialization and increases the inferred consistency of individuals' diets. Time aggregation also made estimates of specialization more sensitive to the consideration of prey frequency, which decreased estimates relative to the use of prey incidence; time aggregation did not affect the extent to which under-sampling contributed to its overestimation. Our analyses demonstrate the importance of studying intraspecific diet variation with an explicit consideration of time and thereby suggest guidelines for future empirical efforts. Failure to consider time will likely produce inconsistent predictions regarding the effects of intraspecific variation on predator-prey interactions.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Novak, M., & Tinker, M. T. (2015). Timescales alter the inferred strength and temporal consistency of intraspecific diet specialization. Oecologia, 178(1), 61-74. doi:10.1007/s00442-014-3213-2
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2015-07-20T21:45:03Z (GMT) No. of bitstreams: 6 NovakMarkIntegrativeBiologyTimescalesAlterInferred.pdf: 3448015 bytes, checksum: 560707051f2c8d22391388a1c0a90b7e (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial1.pdf: 164336 bytes, checksum: eeb8df2737f2a477a378e64d90a9d72c (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial2.pdf: 258408 bytes, checksum: 3f17b1fdac81cb54952bb5e16130908e (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial3.pdf: 432544 bytes, checksum: 9e28cac1bd848e54bc89a38842ff2cb6 (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial4.pdf: 1815764 bytes, checksum: da57ab764bbcf8a3a09f2c2a7427c67b (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial5.pdf: 620832 bytes, checksum: b135c4ca5624f2620a2a9abe0a8ea30a (MD5)
  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2015-07-20T21:44:17Z No. of bitstreams: 6 NovakMarkIntegrativeBiologyTimescalesAlterInferred.pdf: 3448015 bytes, checksum: 560707051f2c8d22391388a1c0a90b7e (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial1.pdf: 164336 bytes, checksum: eeb8df2737f2a477a378e64d90a9d72c (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial2.pdf: 258408 bytes, checksum: 3f17b1fdac81cb54952bb5e16130908e (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial3.pdf: 432544 bytes, checksum: 9e28cac1bd848e54bc89a38842ff2cb6 (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial4.pdf: 1815764 bytes, checksum: da57ab764bbcf8a3a09f2c2a7427c67b (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial5.pdf: 620832 bytes, checksum: b135c4ca5624f2620a2a9abe0a8ea30a (MD5)
  • description.provenance : Made available in DSpace on 2015-07-20T21:45:03Z (GMT). No. of bitstreams: 6 NovakMarkIntegrativeBiologyTimescalesAlterInferred.pdf: 3448015 bytes, checksum: 560707051f2c8d22391388a1c0a90b7e (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial1.pdf: 164336 bytes, checksum: eeb8df2737f2a477a378e64d90a9d72c (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial2.pdf: 258408 bytes, checksum: 3f17b1fdac81cb54952bb5e16130908e (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial3.pdf: 432544 bytes, checksum: 9e28cac1bd848e54bc89a38842ff2cb6 (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial4.pdf: 1815764 bytes, checksum: da57ab764bbcf8a3a09f2c2a7427c67b (MD5) NovakMarkIntegrativeBiologyTimescalesAlterInferredSupplementalMaterial5.pdf: 620832 bytes, checksum: b135c4ca5624f2620a2a9abe0a8ea30a (MD5) Previous issue date: 2015-05

Relationships

In Administrative Set:
Last modified: 07/27/2017 Default
Citations:

EndNote | Zotero | Mendeley