What is in store for the guppy? Variation is essential to understanding the genetics underlying biological processes. The guppy provides a huge amount of natural variation that can be studied genetically. This variation has not been produced by mutagenesis screens, but instead has been shaped by natural selection. Thus, combined with emerging genomic resources, the guppy is an ideal organism fo...

The guppy and fish in the genus Xiphophorus have both been important model systems for the study of natural and sexual selection for over 50 years. Whereas the guppy is unique in the degree to which the environmental variables shaping phenotypic variation are known, Xiphophorus has the advantage that genomic resources have been developed due to the utility of this taxon for the study of melanom...

ABSTRAK Ikan guppy (P. reticulata) merupakan salah satu ikan hias air tawar yang banyak diminati karena variasi warna dan corak siripnya beragam. Warna dipengaruhi oleh sel pigmen pada tubuh. Pigmen tersebut dihasilkan dari penambahan karotenoid pakan. Salah bahan penghasil adalah tepung bunga marigold. Penelitian ini bertujuan untuk mengkaji pengaruh mengetahui dosis terbaik marigold dalam pak...

Predation risk is often associated with group formation in prey, but recent advances in methods for analysing the social structure of animal societies make it possible to quantify the effects of risk on the complex dynamics of spatial and temporal organisation. In this paper we use social network analysis to investigate the impact of variation in predation risk on the social structure of guppy ...

The commercial value of ornamental fish is primarily dependent on their external body colouration. Fade coloured fish fails to attract the interest of the buyers. In the present study an experiment were conducted to evaluate the efficacy of four types of feed (Living tubifex, Dried tubifex, Dried Daphnia and Prepared granulated feed) in the rearing of fantail guppy. Carotenoid content of the fe...

We report construction of a genetic linkage map of the guppy genome using 790 single nucleotide polymorphism markers, integrated from six mapping crosses. The markers define 23 linkage groups (LGs), corresponding to the known haploid number of guppy chromosomes. The map, which spans a genetic length of 899 cM, includes 276 markers linked to expressed genes (expressed sequence tag), which have b...

Parasites can have important effects on the structure and composition of natural biological communities, either directly by influencing host fecundity and survival (i.e., density-mediated effects) or indirectly by influencing host traits such as behavior, life-history, morphology, and physiology (i.e., trait-mediated effects). Yet few studies have explored how these effects play out in the wild...

Males of the guppy (Poecilia reticulata) vary tremendously in their ornamental patterns, which are thought to have evolved in response to a complex interplay between natural and sexual selection. Although the selection pressures acting on the color patterns of the guppy have been extensively studied, little is known about the genes that control their ontogeny. Over 50 years ago, two autosomal c...

Guppies (Poecilia reticulata) are frequently introduced to both natural and artificial water bodies as a mosquito control. Laboratory studies have demonstrated that guppies can consume large numbers of larval mosquitoes. Our study investigates how intraspecific variability in guppy phenotype affects their importance as a mosquito biocontrol and how habitat conditions (natural ponds vs. water st...

Decades of ecological study have demonstrated the importance of top-down and bottom-up controls on food webs, yet few studies within this context have quantified the magnitude of energy and material fluxes at the whole-ecosystem scale. We examined top-down and bottom-up effects on food web fluxes using a field experiment that manipulated the presence of a consumer, the Trinidadian guppy Poecili...