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Forced monogamy in a multiply mating species does not impede colonisation success.

Deacon AE, Barbosa M, Magurran AE - BMC Ecol. (2014)

Bottom Line: The guppy (Poecilia reticulata) is a successful invasive species.It is also a species that mates multiply; previous studies have demonstrated that this strategy carries fitness benefits.These results suggest that even when denied the option of multiple mating, singly-mated female guppies can produce viable populations, at least at the founder stage.

View Article: PubMed Central - HTML - PubMed

Affiliation: Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews, Fife KY16 9TH, UK. aed32@st-andrews.ac.uk.

ABSTRACT

Background: The guppy (Poecilia reticulata) is a successful invasive species. It is also a species that mates multiply; previous studies have demonstrated that this strategy carries fitness benefits. Guppies are routinely introduced to tanks and troughs in regions outside their native range for mosquito-control purposes, and often spread beyond these initial confines into natural water bodies with negative ecological consequences. Here, using a mesocosm set up that resembles the containers into which single guppies are typically introduced for mosquito control, we ask whether singly-mated females are at a disadvantage, relative to multiply-mated females, when it comes to founding a population. Treatments were monitored for one year.

Results: A key finding was that mating history did not predict establishment success, which was 88% in both treatments. Furthermore, analysis of behavioural traits revealed that the descendants of singly-mated females retained antipredator behaviours, and that adult males showed no decrease in courtship vigour. Also, we detected no differences in behavioural variability between treatments.

Conclusions: These results suggest that even when denied the option of multiple mating, singly-mated female guppies can produce viable populations, at least at the founder stage. This may prove to be a critical advantage in typical introduction scenarios where few individuals are released into enclosed water bodies before finding their way into natural ecosystems.

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Mean growth trajectories for single and multiple mated mesocosms over 12 months showing cumulative numbers of individuals. Dotted lines denote 95% confidence intervals.
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Figure 1: Mean growth trajectories for single and multiple mated mesocosms over 12 months showing cumulative numbers of individuals. Dotted lines denote 95% confidence intervals.

Mentions: Of the 40 mesocosm tanks, 35 (87.5%) successfully established populations that still persisted one year after initial introduction. Of the five extinctions, three were from the single and two from the multiple mating treatments. In all cases, the extinction was due to a failure of the female to establish a population at all; no offspring were ever recorded in these five tanks. Population growth trajectories from the visual census data show no difference between the treatments (Figure 1). One year after establishment, the full census also showed no significant difference in final population size between those founded by singly or multiply-mated females (t = 0.504; df = 33; p = 0.618).


Forced monogamy in a multiply mating species does not impede colonisation success.

Deacon AE, Barbosa M, Magurran AE - BMC Ecol. (2014)

Mean growth trajectories for single and multiple mated mesocosms over 12 months showing cumulative numbers of individuals. Dotted lines denote 95% confidence intervals.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4067062&req=5

Figure 1: Mean growth trajectories for single and multiple mated mesocosms over 12 months showing cumulative numbers of individuals. Dotted lines denote 95% confidence intervals.
Mentions: Of the 40 mesocosm tanks, 35 (87.5%) successfully established populations that still persisted one year after initial introduction. Of the five extinctions, three were from the single and two from the multiple mating treatments. In all cases, the extinction was due to a failure of the female to establish a population at all; no offspring were ever recorded in these five tanks. Population growth trajectories from the visual census data show no difference between the treatments (Figure 1). One year after establishment, the full census also showed no significant difference in final population size between those founded by singly or multiply-mated females (t = 0.504; df = 33; p = 0.618).

Bottom Line: The guppy (Poecilia reticulata) is a successful invasive species.It is also a species that mates multiply; previous studies have demonstrated that this strategy carries fitness benefits.These results suggest that even when denied the option of multiple mating, singly-mated female guppies can produce viable populations, at least at the founder stage.

View Article: PubMed Central - HTML - PubMed

Affiliation: Centre for Biological Diversity, School of Biology, University of St Andrews, St Andrews, Fife KY16 9TH, UK. aed32@st-andrews.ac.uk.

ABSTRACT

Background: The guppy (Poecilia reticulata) is a successful invasive species. It is also a species that mates multiply; previous studies have demonstrated that this strategy carries fitness benefits. Guppies are routinely introduced to tanks and troughs in regions outside their native range for mosquito-control purposes, and often spread beyond these initial confines into natural water bodies with negative ecological consequences. Here, using a mesocosm set up that resembles the containers into which single guppies are typically introduced for mosquito control, we ask whether singly-mated females are at a disadvantage, relative to multiply-mated females, when it comes to founding a population. Treatments were monitored for one year.

Results: A key finding was that mating history did not predict establishment success, which was 88% in both treatments. Furthermore, analysis of behavioural traits revealed that the descendants of singly-mated females retained antipredator behaviours, and that adult males showed no decrease in courtship vigour. Also, we detected no differences in behavioural variability between treatments.

Conclusions: These results suggest that even when denied the option of multiple mating, singly-mated female guppies can produce viable populations, at least at the founder stage. This may prove to be a critical advantage in typical introduction scenarios where few individuals are released into enclosed water bodies before finding their way into natural ecosystems.

Show MeSH
Related in: MedlinePlus