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38 results for “Tigriopus californicus”
Data from: Ecological novelty by hybridization: experimental evidence for increased thermal tolerance by transgressive segregation in Tigriopus californicus
Early generations of hybrids can express both genetic incompatibilities and phenotypic novelty. Insights into whether these conflicting interactions between intrinsic and extrinsic selection persist after a few generations of recombination require experimental studies. To address this question, we use interpopulation crosses and recombinant inbred lines (RILs) of the copepod Tigriopus californicus, and focus on two traits that are relevant for the diversification of this species: survivorship during development and tolerance to thermal stress. Experimental crosses between two population pairs show that most RILs between two heat-tolerant populations show enhanced tolerance to temperatures that are lethal to the respective parentals, whereas RILs between a heat-tolerant and a heat-sensitive population are intermediate. Although interpopulation crosses are affected by intrinsic selection at early generational hybrids, most of the sampled F9 RILs have recovered fitness to the level of their parentals. Together, these results suggest that a few generations of recombination allows for an independent segregation of the genes underlying thermal tolerance and cytonuclear incompatibilities, permitting certain recombinant lineages to survive in niches previously unused by parental taxa (i.e., warmer thermal environments) without incurring intrinsic selection.
Data from: Hybrid breakdown weakens under thermal stress in population crosses of the copepod Tigriopus californicus.
The outcome of hybridization can be impacted by environment conditions, which themselves can contribute to reproductive isolation between taxa. In crosses of genetically divergent populations, hybridization can have both negative and positive impacts on fitness, the balance between which might be tipped by changes in the environment. Genetically divergent populations of the intertidal copepod Tigriopus californicus have been shown to differ in thermal tolerance at high temperatures along a latitudinal gradient. In this study a series of crosses were made between pairs of genetically divergent populations of T. californicus and the thermal tolerance of these hybrids was tested. In most cases the first generation hybrids had relatively high thermal tolerance and second generation hybrids were not generally reduced below the less-tolerant parental population for high temperature tolerance. This pattern contrasts with previous studies from crosses of genetically divergent populations of this copepod which often show hybrid breakdown in these second generation hybrids for other measures of fitness. These results suggest that high temperature stress could either increase the positive impacts of hybridization or decrease the negative impacts of hybridization resulting in lowered hybrid breakdown in these population crosses.
Data from: Genomic scans reveal multiple mito‐nuclear incompatibilities in population crosses of the copepod Tigriopus californicus
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Data from: Hybrid breakdown weakens under thermal stress in population crosses of the copepod Tigriopus californicus.
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Data from: Fitness and morphological outcomes of many generations of hybridization in the copepod Tigriopus californicus
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Data from: Ecological novelty by hybridization: experimental evidence for increased thermal tolerance by transgressive segregation in Tigriopus californicus
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Data from: Reverse genetics in the tidepool: knockdown of target gene expression via RNA interference in the copepod Tigriopus californicus
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Data from: Phenotypic and transcriptomic responses to salinity stress across genetically and geographically divergent Tigriopus californicus populations
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Data from: Gene conversion yields novel gene combinations in paralogs of GOT1 in the copepod Tigriopus californicus
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Data from: Potential fitness tradeoffs for thermal tolerance in the intertidal copepod Tigriopus californicus
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Data from: Sex without sex chromosomes: genetic architecture of multiple loci independently segregating to determine sex ratios in the copepod Tigriopus californicus
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Data from: Postzygotic isolation involves strong mitochondrial and sex-specific effects in Tigriopus californicus, a species lacking heteromorphic sex chromosomes
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Data from: Chromosome-wide impacts on the expression of incompatibilities in hybrids of Tigriopus californicus
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Population growth in response to density and extrinsic heat waves in the copepod, Tigriopus californicus
<p>Heat waves are transient environmental events but can have lasting impacts on populations through lethal and sub-lethal effects on demographic vital rates. Sub-lethal temperature stress affects individual energy balance, potentially affecting individual fitness and population growth. Environmental temperature can, however, have distinct effects on different life-history traits, and the net effect of short-term temperature stress on population growth may lead to different population responses over different time frames. Furthermore, sublethal temperature responses may be density dependent, leading to potentially complicated feedbacks between heat stress and demographic responses over time. Here, we test the hypotheses that: (i) populations subjected to higher heat wave temperatures and longer heat wave durations are more negatively affected than those subjected to less intense and shorter heat waves, (ii) heat wave effects are more pronounced during density-dependent population growth phases, and (iii) population density patterns over time mirror the short-term population growth rate responses. We subjected experimental populations of the marine copepod <em>Tigriopus californicus</em> to short-term heat stress perturbations ("heat waves") at two different time points during a 100-day period. Overall, we found that population growth rates and density responded similarly (and moderately) to heat wave intensity and duration, and that the heat wave effects on populations were largely density-dependent. We detected heat wave effects on population growth and density at low densities, but not at high densities. At low densities, we found that population growth declined with heat wave duration for the more intense heat wave intensity group, but did not detect an effect of heat wave duration within the less intense heat wave intensity group. Our study demonstrates that while ephemeral density-independent factors can influence population vital rates, understanding the longer-term consequences of transient perturbations on populations requires understanding these effects in the context of density dependence and its relationship to temperature. Higher densities may buffer the negative effects of intense heat waves and confer some degree of resilience.</p>
Data from: The genomic trajectory of hybrid swarms: outcomes of repeated crosses between populations of Tigriopus californicus
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Population growth in response to density and extrinsic heat waves in the copepod, Tigriopus californicus
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Data from: Multi-generational response to artificial selection for biased clutch sex ratios in Tigriopus californicus populations
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Transcriptomic response of Tigriopus californicus populations to a fluctuation in salinity
GEO Series GSE166634. Tigriopus californicus. 12 samples. Type: Expression profiling by high throughput sequencing.
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