15 Works

Data from: Collective decision making in guppies: a cross-population comparison study in the wild

Romain J. G. Clément, Julián Vicente-Page, Richard P. Mann, Ashley J. W. Ward, Ralf H. J. M. Kurvers, Indar W. Ramnarine, Gonzalo G. De Polavieja & Jens Krause
Collective cognition has received much attention in recent years but most of the empirical work has focused on comparing individuals and groups within single populations, thereby not addressing evolutionary origins of collective cognition. Here we investigated collective cognition in multiple populations that are subject to different levels of predation. Guppies (Poecilia reticulata) were given a simultaneous choice between an edible and a non-edible stimulus. We found evidence for an improvement in decision accuracy when in...

Data from: Composite linkage map and enhanced genome map for Culex pipiens complex mosquitoes

Paul V. Hickner, Akio Mori, Dave D. Chadee & David W. Severson
We report here the development of 65 novel microsatellite loci and construction of a composite genetic linkage map for Culex pipiens complex mosquitoes. Microsatellites were identified by in silico screening of the Culex quinquefasciatus genome assembly. Cross-species utility of 73 microsatellites for population studies in C. pipiens sensu stricto and C. quinquefasciatus was evaluated by genotyping a subset of samples collected in Indiana, United States, and Point Fortin, Trinidad. Allele frequencies of 67 microsatellites were...

Data from: Individual variation in male reproductive behaviour is linked to temporal heterogeneity in predation risk

Miguel Barbosa, Amy E. Deacon, Maria Joao Janeiro, Indar Ramnarine, Michael Blair Morrissey & Anne E. Magurran
Variation in predation risk is a major driver of ecological and evolutionary change, and, in turn, of geographical variation in behaviour. While predation risk is rarely constant in natural populations, the extent to which variation in predation risk shapes individual behaviour in wild populations remains unclear. Here, we investigated individual differences in reproductive behavior in 16 Trinidadian guppy populations and related it to the observed variation in predator biomass each population experienced. Our results show...

Collective decision-making appears more egalitarian in populations where group fission costs are higher

James Herbert-Read, Amy Wade, Indar Ramnarine & Christos Ioannou
Collective decision-making is predicted to be more egalitarian in conditions where the costs of group fission are higher. Here we ask whether Trinidadian guppies (Poecilia reticulata) living in high or low predation environments, and thereby facing differential group fission costs, make collective decisions in line with this prediction. Using a classic decision-making scenario, we found that fish from high predation environments switched their positions within groups more frequently than fish from low predation environments. Because...

Data from: Male mate choice in the Trinidadian guppy is influenced by the phenotype of audience sexual rivals

Heather L. Auld, Indar W. Ramnarine & Jean-Guy J. Godin
In populations with male mate-choice copying, males may mitigate their risk of sexual competition by reducing their preference for a particular female in the presence of sexual rivals (audience). Because of the cost of missed mating opportunities from such an audience effect, males should reduce their mating preference to a greater extent in the presence of more sexually competitive rivals compared with less competitive ones. We tested this hypothesis using the Trinidadian guppy (Poecilia reticulata)....

Data from: Evidence for contemporary and historical gene flow between guppy populations in different watersheds, with a test for associations with adaptive traits

Léa Blondel, Lyndsey Baillie, Jessica Quinton, Jahson B. Alemu, Ian Paterson, Andrew P. Hendry & Paul Bentzen
In dendritic river systems, gene flow is expected to occur primarily within watersheds. Yet, rare cross‐watershed transfers can also occur, whether mediated by (often historical) geological events or (often contemporary) human activities. We explored these events and their potential evolutionary consequences by analyzing patterns of neutral genetic variation (microsatellites) and adaptive phenotypic variation (male color) in wild guppies (Poecilia reticulata) distributed across two watersheds in northern Trinidad. We found the expected signatures of within‐watershed gene...

Data from: Possible glimpses into early speciation: the effect of ovarian fluid on sperm velocity accords with post-copulatory isolation between two guppy populations

Alessandro Devigili, John L Fitzpatrick, Clelia Gasparini, Indar W Ramnarine, Andrea Pilastro & Jonathan P Evans
Identifying mechanisms of reproductive isolation is key to understanding speciation. Among the putative mechanisms underlying reproductive isolation, sperm-female interactions (postmating-prezygotic barriers) are arguably the hardest to identify, not least because these are likely to operate at the cellular or molecular level. Yet sperm-female interactions offer great potential to prevent the transfer of genetic information between different populations at the initial stages of speciation. Here we provide a preliminary test for the presence of a putative...

The effects of salinity on the ecology of a coastal temporary pond (Data)

Gavin Campbell & Eric Hyslop
Temporary waters are relatively understudied environments, particularly within the Caribbean. Regionally understudied as well are the insect fauna associated with coastal environments. The present study sought to identify factors affecting the salinity of a coastal temporary pond and the subsequent ecological interactions. When water was present, the aquatic physical and chemical properties were recorded, and macroinvertebrate fauna were collected. Soil and water were collected for analyses and associations between the aquatic environment and fauna detailed....

Comparative toxicity of larvicides and growth inhibitors on Aedes aegypti from select areas in Jamaica

Sheena Francis, Jervis Crawford, Sashell McKenzie, Towanna Campbell, Danisha Wright, Trevann Hamilton, Sherine Huntley-Jones, Simone Spence, Allison Belemvire, Kristen Alavi & Carolina Torres Gutierrez
Insecticide resistance has become problematic in tropical and subtropical regions, where Aedes mosquitoes and Aedes-borne arboviral diseases thrive. With the recent occurrence of Chikungunya and the Zika virus in Jamaica, the Ministry of Health and Wellness, Jamaica, partnered with the United States Agency for International Development to implement multiple intervention activities to reduce the Aedes aegypti populations in seven parishes across the island and to assess the susceptibility of collected samples to various concentrations of...

Data from: Population demography and heterozygosity-fitness correlations in natural guppy populations: an examination using sexually selected fitness traits

Catherine E. Grueber, John L. Fitzpatrick, Alessandro Devigili, Clelia Gasparini, Indar W. Ramnarine & Jonathan P. Evans
Heterozygosity-fitness correlations (HFCs) have been examined in a wide diversity of contexts, and the results are often used to infer the role of inbreeding in natural populations. Although population demography, reflected in population-level genetic parameters such as allelic diversity or identity disequilibrium, is expected to play a role in the emergence and detectability of HFCs, direct comparisons of variation in HFCs across many populations of the same species, with different genetic histories, are rare. Here,...

Data from: Guppies occupy consistent positions in social networks: mechanisms and consequences

Stefan Krause, Alexander D.M. Wilson, Indar W. Ramnarine, James E. Herbert-Read, Romain J.G. Clément & Jens Krause
The social network approach has focused increasing attention on the complex web of relationships found in animal groups and populations. As such, network analysis has been used frequently to identify the role that particular individuals play in their social interactions and this approach has led to the question of whether, and in what context, individuals consistently occupy certain positions within their network. Here we investigated the social networks of guppies, Poecilia reticulata, in the wild...

Data from: Utility of internally transcribed spacer region of rDNA (ITS) and β-tubulin gene sequences to infer genetic diversity and migration patterns of Colletotrichum truncatum infecting Capsicum spp.

Kandyce Rampersad, Hema Ramdial & Sephra N. Rampersad
Anthracnose is among the most economically important diseases affecting pepper (Capsicum spp.) production in the tropics and subtropics. Of the three species of Colletotrichum implicated as causal agents of pepper anthracnose, C. truncatum is considered to be the most destructive in agro-ecosystems worldwide. However, the genetic variation and the migration potential of C. truncatum infecting pepper are not known. Five populations were selected for study and a two-locus (internally transcribed spacer region, ITS1-5.8S-ITS2, and β-tubulin,...

Data from: Evolution of non-kin cooperation: social assortment by cooperative phenotype in guppies

Josefine Brask, Darren Croft, Matthew Edenbrow, Richard James, Heather Bleakley, Indar Ramnarine, Robert Heathcote, Charles Tyler, Patrick Hamilton, Torben Dabelsteen & Safi Darden
Cooperation among non-kin constitutes a conundrum for evolutionary biology. Theory suggests that non-kin cooperation can evolve if individuals differ consistently in their cooperative phenotypes and assort socially by these, such that cooperative individuals interact predominantly with one another. However, our knowledge of the role of cooperative phenotypes in the social structuring of real-world animal populations is minimal. In this study, we investigated cooperative phenotypes and their link to social structure in wild Trinidadian guppies (Poecilia...

Data from: Do stressful conditions make adaptation difficult? Guppies in the oil-polluted environments of southern Trinidad

Gregor Rolshausen, Dawn A. T. Phillip, Denise M. Beckles, Ali Akbari, Subhasis Ghoshal, Patrick B. Hamilton, Charles R. Tyler, Alan G. Scarlett, Indar Ramnarine, Paul Bentzen & Andrew P. Hendry
The ability of populations to rapidly adapt to new environments will determine their future in an increasingly human-modified world. Although meta-analyses do frequently uncover signatures of local adaptation, they also reveal many exceptions. We suggest that particular constraints on local adaptation might arise when organisms are exposed to novel stressors, such as anthropogenic pollution. To inform this possibility, we studied the extent to which guppies (Poecilia reticulata) show local adaptation to oil pollution in southern...

Data from: Biodiversity assessment of tropical shelf eukaryotic communities via pelagic eDNA metabarcoding

Owen S. Wangensteen, Judith Bakker, Stefano Mariani, Charles Baillie, Dayne Buddo, Demian D. Chapman, Austin J. Gallagher, Tristan L. Guttridge & Heidi Hertler
Our understanding of marine communities and their functions in an ecosystem relies on the ability to detect and monitor species distributions and abundances. Currently, the use of environmental DNA (eDNA) metabarcoding is increasingly being applied for the rapid assessment and monitoring of aquatic species. Most eDNA metabarcoding studies have either focused on the simultaneous identification of a few specific taxa/groups or have been limited in geographical scope. Here we employed eDNA metabarcoding to compare beta...

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