Acquired resistance affects male sexual display and female choice in guppies

López, Silvia N.

doi:10.1098/rspb.1998.0352

Cited by 58 publications

(44 citation statements)

References 32 publications

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“…In many animal species, females choose mates by assessing courtship behaviors (Edvardsson and Arnqvist, 2000;Lopez, 1998;Rebar et al, 2009;Sargent et al, 1998). Males may also gain some fertilizations by employing other strategies like forced copulations (Clutton-Brock and Parker, 1995).…”

Section: Introductionmentioning

confidence: 99%

Prenatal exposure to low doses of atrazine affects mating behaviors in male guppies

Shenoy

2014

Hormones and Behavior

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Section: Introductionmentioning

confidence: 99%

Prenatal exposure to low doses of atrazine affects mating behaviors in male guppies

Shenoy

2014

Hormones and Behavior

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“…In the present sample, about 7% of the UA guppies were infected by 10 or more gyrodactylids. This parasite load significantly reduces feeding behavior (van Oosterhout et al 2003) and is detrimental to both male courtship display and ornamentation (Kennedy et al 1987;Houde and Torio 1992;Ló pez 1998). Several UA guppies carried 50 or more gyrodactylid parasites, a load that is generally lethal for the host (J.…”

Section: Parasite Communitymentioning

confidence: 99%

Balancing Selection, Random Genetic Drift, and Genetic Variation at the Major Histocompatibility Complex in Two Wild Populations of Guppies (Poecilia Reticulata)

et al. 2006

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Abstract. Our understanding of the evolution of genes of the major histocompatibility complex (MHC) is rapidly increasing, but there are still enigmatic questions remaining, particularly regarding the maintenance of high levels of MHC polymorphisms in small, isolated populations. Here, we analyze the genetic variation at eight microsatellite loci and sequence variation at exon 2 of the MHC class IIB (DAB) genes in two wild populations of the Trinidadian guppy, Poecilia reticulata. We compare the genetic variation of a small (N e ഠ 100) and relatively isolated upland population to that of its much larger (N e ഠ 2400) downstream counterpart. As predicted, microsatellite diversity in the upland population is significantly lower and highly differentiated from the population further downstream. Surprisingly, however, these guppy populations are not differentiated by MHC genetic variation and show very similar levels of allelic richness. Computer simulations indicate that the observed level of genetic variation can be maintained with overdominant selection acting at three DAB loci. The selection coefficients differ dramatically between the upland (s Ն 0.2) and lowland (s Յ 0.01) populations. Parasitological analysis on wild-caught fish shows that parasite load is significantly higher on upland than on lowland fish, which suggests that large differences in selection intensity may indeed exist between populations. Based on the infection intensity, a substantial proportion of the upland fish would have suffered direct or indirect fitness consequences as a result of their high parasite loads. Selection by parasites plays a particularly important role in the evolution of guppies in the upland habitat, which has resulted in high levels of MHC diversity being maintained in this population despite considerable genetic drift.Key words. Balancing selection, computer simulation, guppy, Gyrodactylus, major histocompatibility complex, parasite, random genetic drift. Genes of the major histocompatibility complex (MHC) provide among the best opportunities to study natural selection in wild populations (Bernatchez and Landry 2003). The genes of the MHC are among the most polymorphic loci in the vertebrate nuclear genome (Hughes 1999), and their function at a molecular level is well understood. The genes of the MHC encode cell surface proteins that bind nonself peptides, usually from pathogens. These peptides are presented to the T-cells, and this interaction elicits an immune response. The range of peptides an individual can successfully present to the immune system is predicted to be associated to an individual's immunocompetence, and hence, to its parasite resistance (Nei and Hughes 1991).Balancing selection appears to be important in maintaining high variability observed at many MHC genes (Hedrick 1999a), and many recent studies detected associations between parasite resistance and MHC heterozygosity (Penn et al. 2002) or particular MHC alleles (Hansson et al. 2004;Harf and Sommer 2005;Meyer-Lucht and Sommer 2005;Schad et al. 2005...

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“…Heavy infections may also reduce a host's physical agility or modify the shape and size of the fish, affecting its profile in the water, and thus generating increased hydrodynamic drag [29]. Few studies have attempted to examine the impact of infection on fish behaviour within a flow environment, with the majority of experiments being conducted in tanks of static water [30][31][32]. To our knowledge, no previous study has quantified how turbulence levels impact infected fish, and generally little is known about the potential implications of habitat heterogeneity on host-parasite interactions in aquatic systems.…”

mentioning

confidence: 99%

Fish responses to flow velocity and turbulence in relation to size, sex and parasite load

Hockley

Wilson

Brew

et al. 2014

J. R. Soc. Interface.

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Riverine fish are subjected to heterogeneous flow velocities and turbulence and may use this to their advantage by selecting regions that balance energy expenditure for station holding while maximizing energy gain through feeding opportunities. This study investigated microhabitat selection by guppies Poecilia reticulata in terms of flow characteristics generated by hemisphere boulders in an open channel flume. Velocity and turbulence influenced the variation in swimming behaviour with respect to size, sex and parasite intensity. With increasing body length, fish swam further and more frequently between boulder regions. Larger guppies spent more time in the areas of high-velocity and low-turbulence regions beside the boulders, whereas smaller guppies frequented the low-velocity and high-turbulence regions directly behind the boulders. Male guppies selected the regions of low velocity, indicating possible reduced swimming ability owing to hydrodynamic drag imposed by their fins. With increasing Gyrodactylus turnbulli burden, fish spent more time in regions with moderate velocity and lowest turbulent kinetic energy which were the most spatially and temporally homogeneous in terms of velocity and turbulence. These findings highlight the importance of heterogeneous flow conditions in river channel design owing to the behavioural variability within a species in response to velocity and turbulence.

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Acquired resistance affects male sexual display and female choice in guppies

Cited by 58 publications

References 32 publications

Prenatal exposure to low doses of atrazine affects mating behaviors in male guppies

Prenatal exposure to low doses of atrazine affects mating behaviors in male guppies

Balancing Selection, Random Genetic Drift, and Genetic Variation at the Major Histocompatibility Complex in Two Wild Populations of Guppies (Poecilia Reticulata)

Fish responses to flow velocity and turbulence in relation to size, sex and parasite load

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