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Martinig AR, McAdam AG, Dantzer B, Lane JE, Coltman DW, Boutin S. The new kid on the block: immigrant males win big whereas females pay fitness cost after dispersal. Ecol Lett 2019; 23:430-438. [DOI: 10.1111/ele.13436] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/11/2019] [Accepted: 10/26/2019] [Indexed: 12/16/2022]
Affiliation(s)
| | - Andrew G. McAdam
- Department of Integrative Biology University of Guelph Guelph ON Canada
| | - Ben Dantzer
- Department of Psychology University of Michigan Ann Arbor MI USA
- Department of Ecology & Evolutionary Biology University of Michigan Ann Arbor MI USA
| | - Jeffrey E. Lane
- Department of Biology University of Saskatchewan Saskatoon SK Canada
| | - David W. Coltman
- Department of Biological Sciences University of Alberta Edmonton AB Canada
| | - Stan Boutin
- Department of Biological Sciences University of Alberta Edmonton AB Canada
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Wishart AE, Williams CT, McAdam AG, Boutin S, Dantzer B, Humphries MM, Coltman DW, Lane JE. Is biasing offspring sex ratio adaptive? A test of Fisher's principle across multiple generations of a wild mammal in a fluctuating environment. Proc Biol Sci 2018; 285:rspb.2018.1251. [PMID: 30464061 DOI: 10.1098/rspb.2018.1251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 10/29/2018] [Indexed: 12/15/2022] Open
Abstract
Fisher's principle explains that population sex ratio in sexually reproducing organisms is maintained at 1 : 1 owing to negative frequency-dependent selection, such that individuals of the rare sex realize greater reproductive opportunity than individuals of the more common sex until equilibrium is reached. If biasing offspring sex ratio towards the rare sex is adaptive, individuals that do so should have more grandoffspring. In a wild population of North American red squirrels (Tamiasciurus hudsonicus) that experiences fluctuations in resource abundance and population density, we show that overall across 26 years, the secondary sex ratio was 1 : 1; however, stretches of years during which adult sex ratio was biased did not yield offspring sex ratios biased towards the rare sex. Females that had litters biased towards the rare sex did not have more grandoffspring. Critically, the adult sex ratio was not temporally autocorrelated across years, thus the population sex ratio experienced by parents was independent of the population sex ratio experienced by their offspring at their primiparity. Expected fitness benefits of biasing offspring sex ratio may be masked or negated by fluctuating environments across years, which limit the predictive value of the current sex ratio.
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Affiliation(s)
- Andrea E Wishart
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2
| | - Cory T Williams
- Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
| | - Andrew G McAdam
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
| | - Stan Boutin
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9
| | - Ben Dantzer
- Department of Psychology, University of Michigan, Ann Arbor, MI 48109-1043, USA.,Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48109-1043, USA
| | - Murray M Humphries
- Natural Resource Sciences, MacDonald Campus, McGill University, Ste-Anne-de-Bellevue, Québec, Canada H9X 3V9
| | - David W Coltman
- Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
| | - Jeffrey E Lane
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2
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