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13 results for “resource polymorphism”
Data for: The interaction between metabolic rate, habitat choice, and resource use in a polymorphic freshwater species
<p>Raw respirometry data and respirometry code</p> <p>Data.xlsx is the data about each fish that was used for all analyses including Stable Isotope values, length, weight, sex, and habitat. This is the data that is used in the R code. </p> <p>Example code of the models used in our analyses</p> <p>TEF_metabolism.xlsx is data on the fish that were kept in the lab for almost a year. </p> <p> </p>
Stable resource polymorphism along the benthic littoral-pelagic axis in an invasive crayfish
<p>Although intraspecific variability is now widely recognized as affecting evolutionary and ecological processes, our knowledge on the importance of intraspecific variability within invasive species is still limited. This is despite the fact that quantifying the extent of within-population morphological divergences associated with the use of different trophic or spatial resources (i.e. resource polymorphism) can help to better predict their ecological impacts on recipient ecosystems. Here, we quantified the extent of resource polymorphism within populations of a highly invasive species, Procambarus clarkii, in 16 lake populations by comparing their trophic (estimated using stable isotope analyses) and morphological characteristics between individuals from the littoral and pelagic habitats. Our results first demonstrated that crayfish occur in both littoral and pelagic habitats of 7 lakes and that the use of pelagic habitat was associated with increased abundance of crayfish in the littoral habitat. We then found that individuals from littoral and pelagic habitats displayed significantly different body and chelae morphology and origin of resource use (i.e. reliance on littoral carbon). These results demonstrate the existence of resource polymorphism in invasive populations. There was no genetic differentiation between individuals from the two habitats, implying that this resource polymorphism was stable (i.e. high gene flow between individuals). Finally, we demonstrated that a divergent adaptive process was responsible for the morphological divergence in body and chela shapes btween habitats while difference in origin of the resource use neutrally evolved under genetic drift. These findings demonstrated that invasive P. clarkii can display strong within-population phenotypic variability in recent populations, and this could lead to contrasted ecological impacts between littoral and pelagic individuals.</p>
Intraspecific competition and temperature drive habitat-based resource polymorphism in brook charr
<p><span>Intra- and interspecific competition, two density-dependent processes, are the two main driving forces suggested to promote habitat-based resource polymorphism, but very few studies have provided empirical support for this hypothesis. Furthermore, </span><span>external drivers like temperature, an important environmental constraint in ectotherms, are often omitted when studying density-dependent habitat selection. Specifically, ambient temperature may have important effects on habitat-based resource polymorphism in ectotherms. Using mixed-effects modelling and isodar analyses, we quantified the effects of water temperature as well as intra- and interspecific competition on abundance and density-dependent habitat selection of brook charr (<em>Salvelinus</em> <em>fontinalis</em>) between littoral and pelagic habitats in 27 Canadian Shield lakes. We found that interspecific competition with white sucker (<em>Catostomus</em> <em>commersonii</em>) reduced brook charr abundances in both habitats but did not affect their </span><span>density-dependent habitat selection. </span><span>In contrast, the isodar analysis </span><span>showed density-dependent habitat selection, confirming that intraspecific competition is a driver of brook charr habitat use in this system. </span><span>Furthermore, brook charr preferred the littoral habitat at water temperatures below 20.8°C, but preferred the pelagic habitat above this threshold and no longer used the littoral habitat when its temperature was above ~22.2°C. By incorporating an external driver in the density-dependent habitat selection model, we show how the littoral temperature can shape brook charr distribution patterns between the littoral and pelagic habitats by acting as a thermal barrier and thus limiting the willingness of fish to use resources in the littoral habitat. </span><span>This result suggests that global warming could constrain the diversifying effect of intraspecific competition</span><span> and prevent resource polymorphism, a phenomenon that promotes adaptive radiation and speciation</span><span>.</span></p>
Data from: Developing genomic resources for the common bottlenose dolphin (Tursiops truncatus): isolation and characterisation of 153 single nucleotide polymorphisms and 53 genotyping assays
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Intraspecific competition and temperature drive habitat-based resource polymorphism in brook charr
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Data from: "De novo transcriptome assembly and polymorphism detection in ecological important widely distributed Neotropical toads from the Rhinella marina species complex (Anura: Bufonidade)" in Genomic Resources Notes Accepted 1 August 2014-30 September 2014
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Stable resource polymorphism along the benthic littoral-pelagic axis in an invasive crayfish
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Data from: Development of genomic resources for the tick Ixodes ricinus: isolation and characterization of single nucleotide polymorphisms
Assessing the genetic variability of the tick Ixodes ricinus - an important vector of pathogens in Europe - is an essential step for setting-up anti-tick control methods. Here, we report the first identification of a set of SNPs isolated from the genome of I. ricinus, carried out by applying a genomic complexity reduction step, followed by pyrosequencing and the use new bioinformatics tools. Almost 1.4 million reads (average length : 528 nt) were generated with a full Roche 454 GS FLX run on two Reduced Representation Libraries of I. ricinus. 321,088 putative SNPs were isolated using the newly developed bioinformatics tool READ2SNPS, which identifies SNPs without requiring a reference genome. Stringent selection criteria were applied in a bioinformatics pipeline to select 1,768 SNPs for the development of specific primers. Among 384 randomly selected SNPs, tested by Fluidigm genotyping technology on 464 individual ticks, 368 SNPs loci (96%) exhibited the presence of the two expected alleles. Hardy-Weinberg equilibrium tests conducted on 6 natural populations of ticks showed that from 26 to 46 of the 384 loci exhibited significant heterozygote deficiencies. The generated SNP resource described here will be useful for a variety of applications such as the assessment of the genetic structure of I. ricinus populations.
Data from: Development of genomic resources for the tick Ixodes ricinus: isolation and characterization of single nucleotide polymorphisms
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Data from: "454 sequencing of reduced representation libraries to discover single nucleotide polymorphisms (SNPs) in Megabunus harvestmen" in Genomic Resources Notes accepted 1 December 2013 to 31 January 2014
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Data from: "Identification and assessment of single nucleotide polymorphisms (SNPs) between Culex complex mosquitoes." in Genomic Resources Notes Accepted 1 August 2014-30 September 2014
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Data from: Development and preliminary evaluation of a genome-wide single-nucleotide polymorphisms resource generated by RAD-seq for the small yellow croaker (Larimichthys polyactis)
Recent advances in high-throughput sequencing technologies have offered the possibility to generate genome-wide sequence data to delineate previously unidentified genetic structure, obtain more accurate estimates of demographic parameters, and to evaluate potential adaptive divergence. Here, we identified 27 556 single-nucleotide polymorphisms for the small yellow croaker (Larimichthys polyactis) using restriction-site-associated DNA (RAD) sequencing of 24 individuals from two populations. Significant sources of genetic variation was identified, with an average nucleotide diversity (π) of 0.00105 ± 0.000425 across individuals and long-term effective population size was thus estimated to range between 26 172 and 261 716. According to the results, no differentiation between the two populations was detected based on the SNP dataset of top quality score per contig or neutral loci. However, the two analyzed populations were highly differentiated based on SNP dataset of both top FST value per contig and the outlier SNPs. Moreover, local adaptation was highlighted by an FST-based outlier tests implemented in LOSITAN and a total of 538 potentially locally selected SNPs were identified. BLAST2GO annotation of contigs containing the outlier SNPs yielded hits for 37 (66%) of 56 significant BLASTX matches. Candidate genes for local adaptation constituted a wide array of biological functions, including cellular response to oxidative stress, actin filament binding, ion transmembrane transport and synapse assembly. The generated SNP resources in the present study provided a valuable tool for future population genetics and genomics studies of L. polyactis.
Data from: Development and preliminary evaluation of a genome-wide single-nucleotide polymorphisms resource generated by RAD-seq for the small yellow croaker (Larimichthys polyactis)
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