Mate-finding dispersal reduces local mate limitation and sex bias in dispersal
© 2020 British Ecological Society..
Sex-biased dispersal (SBD) often skews the local sex ratio in a population. This can result in a shortage of mates for individuals of the less-dispersive sex. Such mate limitation can lead to Allee effects in populations that are small or undergoing range expansion, consequently affecting their survival, growth, stability and invasion speed. Theory predicts that mate shortage can lead to either an increase or a decrease in the dispersal of the less-dispersive sex. However, neither of these predictions have been empirically validated. To investigate how SBD-induced mate limitation affects dispersal of the less-dispersive sex, we used Drosophila melanogaster populations with varying dispersal propensities. To rule out any mate-independent density effects, we examined the behavioural plasticity of dispersal in the presence of mates as well as same-sex individuals with differential dispersal capabilities. In the presence of high-dispersive mates, the dispersal of both male and female individuals was significantly increased. However, the magnitude of this increase was much larger in males than in females, indicating that the former shows greater mate-finding dispersal. Moreover, the dispersal of either sex did not change when dispersing alongside high- or low-dispersive individuals of the same sex. This suggested that the observed plasticity in dispersal was indeed due to mate-finding dispersal, and not mate-independent density effects. Strong mate-finding dispersal can diminish the magnitude of sex bias in dispersal. This can modulate the evolutionary processes that shape range expansions and invasions, depending on the population size. In small populations, mate-finding dispersal can ameliorate Allee effects. However, in large populations, it can dilute the effects of spatial sorting.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:89 |
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| Enthalten in: |
The Journal of animal ecology - 89(2020), 9 vom: 15. Sept., Seite 2089-2098 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Mishra, Abhishek [VerfasserIn] |
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| Links: |
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| Themen: |
Dispersal evolution |
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| Anmerkungen: |
Date Completed 07.04.2021 Date Revised 07.04.2021 published: Print-Electronic Dryad: 10.5061/dryad.qjq2bvqcz Citation Status MEDLINE |
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| doi: |
10.1111/1365-2656.13278 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM311150462 |
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| 245 | 1 | 0 | |a Mate-finding dispersal reduces local mate limitation and sex bias in dispersal |
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| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2020 British Ecological Society. | ||
| 520 | |a Sex-biased dispersal (SBD) often skews the local sex ratio in a population. This can result in a shortage of mates for individuals of the less-dispersive sex. Such mate limitation can lead to Allee effects in populations that are small or undergoing range expansion, consequently affecting their survival, growth, stability and invasion speed. Theory predicts that mate shortage can lead to either an increase or a decrease in the dispersal of the less-dispersive sex. However, neither of these predictions have been empirically validated. To investigate how SBD-induced mate limitation affects dispersal of the less-dispersive sex, we used Drosophila melanogaster populations with varying dispersal propensities. To rule out any mate-independent density effects, we examined the behavioural plasticity of dispersal in the presence of mates as well as same-sex individuals with differential dispersal capabilities. In the presence of high-dispersive mates, the dispersal of both male and female individuals was significantly increased. However, the magnitude of this increase was much larger in males than in females, indicating that the former shows greater mate-finding dispersal. Moreover, the dispersal of either sex did not change when dispersing alongside high- or low-dispersive individuals of the same sex. This suggested that the observed plasticity in dispersal was indeed due to mate-finding dispersal, and not mate-independent density effects. Strong mate-finding dispersal can diminish the magnitude of sex bias in dispersal. This can modulate the evolutionary processes that shape range expansions and invasions, depending on the population size. In small populations, mate-finding dispersal can ameliorate Allee effects. However, in large populations, it can dilute the effects of spatial sorting | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a Drosophila melanogaster | |
| 650 | 4 | |a dispersal evolution | |
| 650 | 4 | |a dispersal plasticity | |
| 650 | 4 | |a dispersal propensity | |
| 650 | 4 | |a spatial sorting | |
| 650 | 4 | |a temporal dispersal profile | |
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| 700 | 1 | |a Shree Sruti, V R |e verfasserin |4 aut | |
| 700 | 1 | |a Srivathsa, Sahana |e verfasserin |4 aut | |
| 700 | 1 | |a Dey, Sutirth |e verfasserin |4 aut | |
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