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Perspectives on over-marking: is it good to be on top?

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Abstract

What we refer to as over-marking occurs when one individual places its scent mark on top of, touching, or adjacent to the scent mark of another individual, usually a conspecific. Over-marking frequently occurs among mammals that share common paths, trails, and runways. Despite its ubiquity among terrestrial mammals, we know little about how individuals respond to over-marks and the function(s) of over-marking. Studies on voles and golden hamsters indicate that after exploring an over-mark, individuals respond selectively to the mark of the top-scent donor relative to that of the bottom-scent donor. Thus, individuals may be able to focus their attention on a particular scent mark relevant at a particular time and in a particular context, neglecting other scent marks that are present. The function(s) of over-marking are examined within the framework of ten hypotheses. Several hypotheses are plausible. However, the bulk of the literature is consistent with hypotheses stating that over-marking serving a role in olfactory communication between opposite and same-sex conspecifics. Lastly, we postulate the costs and benefits that may be garnered by the top-scent donor of an over-mark.

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Acknowledgments

We thank L. Drickamer, J. delBarco-Trillo, A. Vaughn, and L. LaDage for commenting on earlier drafts of this manuscript. This work was supported by National Science Foundation grant IOB 0444553 and NIH grant AG 16594 and HD 049525.

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Correspondence to Michael H. Ferkin.

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Ferkin, M.H., Pierce, A.A. Perspectives on over-marking: is it good to be on top?. J Ethol 25, 107–116 (2007). https://doi.org/10.1007/s10164-006-0012-1

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