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68 results for “fitness differences”
Data from: Soil microbes generate stronger fitness differences than stabilization among California annual plants
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Fitness consequences of seasonally different life histories? A match-mismatch experiment
To survive and reproduce successfully, animals have to find the optimal time of breeding. Species living in non-tropical environments often adjust their reproduction plastically according to seasonal changes of the environment. Information about the prevailing season can be transmitted in utero, leading to adaptation of the offspring to the prevailing season. After birth, animals acquire additional personal information about the environment which allows them to adjust their reproductive investment. Here, we tested in a full-factorial match-mismatch experiment the influence of reproductive adjustments according to maternal and personal information. We bred wild cavies (Cavia aperea), a precocial rodent, either into increasing (spring) or decreasing (autumn) photoperiod and subsequently, after weaning, transferred female offspring to the matching or mismatching season. We measured growth, specific metabolic rate (sRMR) and reproductive events across six months. Although sRMR was elevated for females primed for good (spring) conditions when transferred to the mismatching autumn condition, we found no maternal effects on reproduction. Females adjusted their reproductive decisions according to the season they personally experienced, thereby implying a potentially high level of plasticity. Females reproducing in spring started reproduction earlier with a lower reproductive effort than females reproducing in autumn but ultimately, the two groups did not differ in survival, growth or reproduction. These data suggest important developmental plasticity, highlight the use of personal information acquired after weaning over early information provided until weaning and point out the potential value of multiple cues such as food abundance and quality and temperature besides photoperiod.
Data from: Fitness benefits to bacteria of carrying prophages and prophage-encoded antibiotic-resistance genes peak in different environments
<p>Understanding the role of horizontal gene transfer (HGT) in adaptation is a key challenge in evolutionary biology. In microbes, an important mechanism of HGT is prophage acquisition (phage genomes integrated into bacterial chromosomes). Prophages can influence bacterial fitness via transfer of beneficial genes (including antibiotic-resistance genes, ARGs), protection from superinfecting phages, or switching to a lytic lifecycle which releases free phages infectious to competitors. We expect these effects to depend on environmental conditions because of, for example, environment-dependent induction of the lytic lifecycle. However, it remains unclear how costs/benefits of prophages vary across environments. Here, studying prophages with/without ARGs in <i>Escherichia coli</i>, we disentangled effects of prophages alone and adaptive genes they carry. In competition with prophage-free strains, benefits from prophages and ARGs peaked in different environments. Prophages were most beneficial when induction of the lytic lifecycle was common, whereas ARGs were more beneficial upon antibiotic exposure and with reduced prophage induction. Acquisition of prophage-encoded ARGs by competing strains was most common when prophage induction, and therefore free phages, were common. Thus, selection on prophages and adaptive genes they carry varies independently across environments, which is important for predicting the spread of mobile/integrating genetic elements and their role in evolution</p>
Data from: The modulating role of group stability on fitness effects of group size is different in females and males of a communally rearing rodent
Group size may influence fitness benefits and costs that emerge from cooperative and competitive interactions in social species. However, evidence from plural breeding mammals indicates that group size is insufficient to explain variation in direct fitness, implying other attributes of social groups were overlooked. We studied the natural population of a social rodent during 5 years to test the hypothesis that social stability – in terms of group composition – modulates the effects of increasing number of breeding females (a proxy of communal rearing) and males on the number of offspring weaned (sired) and on the number of offspring weaned (sired) surviving to breeding age (two proxies of direct fitness). We quantified the effects of social stability (measured as changes in female or male group members between mating and the onset of lactation) on these fitness measures. We used live trapping, telemetry and DNA markers to determine social and fitness measures. Social stability in degus was variable in terms of the number of changes in group composition across groups. Low stability was mostly due to mortality and emigration of group members. Results supported a modulating role of social stability on the relationship between group size and the number of offspring weaned (sired). Stability in female and male group composition were both modulators of fitness to females and males. The modulatory role of stability was sex specific, where high social stability was often fitness beneficial to the females. Instead, low social stability was fitness enhancing to the males.
Data from: Heritable differences in fitness-related traits among populations of the mustard hill coral, Porites astreoides
A population's potential for rapid evolutionary adaptation can be estimated from the amount of genetic variation in fitness-related traits. Inshore populations of the mustard hill coral (Porites astreoides) have been shown to be more tolerant to thermal stress than offshore populations, but it is unclear whether this difference is due to long-term physiological acclimatization or genetic adaptation. Here, we evaluated variation in growth rate and survival among 38 families of juvenile recruits of P. astreoides spawned by colonies originating from inshore and offshore locations. Recruits were reared in a common garden for 5 weeks and then subjected to two thermal treatments (28 and 31 °C) for 2.5 weeks. The most significant effects were detected during the first 5 weeks, before thermal stress was applied: 27–30% of variance in growth and 94% of variance in recruit survival was attributable to parental effects. Genotyping of eight microsatellite loci indicated that the high early mortality of some of the recruit families was not due to higher inbreeding. Post treatment, parental effects diminished such that only 10–15% of variance in growth rate was explained, which most likely reflects the dissipation of maternal effects. However, offshore-origin recruits still grew significantly less under elevated temperature compared with inshore-origin recruits. These differences observed in naive juvenile corals suggest that population-level variation in fitness in response to different thermal environments has a genetic basis and could represent raw material for natural selection in times of climate change.
Data from: Intra- and intersexual differences in parasite resistance and female fitness tolerance in a polymorphic insect
To understand host–parasite interactions, it is necessary to quantify variation and covariation in defence traits. We quantified parasite resistance and fitness tolerance of a polymorphic damselfly (Ischnura elegans), an insect with three discrete female colour morphs but with monomorphic males. We quantified sex and morph differences in parasite resistance (prevalence and intensity of water mite infections) and morph-specific fitness tolerance in the females in natural populations for over a decade. There was no evidence for higher parasite susceptibility in males as a cost of sexual selection, whereas differences in defence mechanisms between female morphs are consistent with correlational selection operating on combinations of parasite resistance and tolerance. We suggest that tolerance differences between female morphs interact with frequency-dependent sexual conflict, which maintains the polymorphism locally. Host–parasite interactions can therefore shape intra- and intersexual phenotypic divergence and interfere with sexual selection and sexual conflict.
Pollen color morphs take different paths to fitness
Color phenotypes are often involved in communication and are thus under selection by species interactions. However, selection may also act on color through correlated traits or alternative functions of biochemical pigments. Such forms of selection are instrumental in maintaining petal color diversity in plants. Pollen color also varies markedly, but the maintenance of this variation is little understood. In Campanula americana, pollen ranges from white to dark purple, with darker morphs garnering more pollinator visits and exhibiting elevated pollen performance under heat stress. Here, we generate an F2 population segregating for pollen color and measure correlations with floral traits, pollen attributes, and plant-level traits related to fitness. We determine the pigment biochemistry of color variants, and evaluate maternal and paternal fitness of light and dark morphs by crossing within and between morphs. Pollen color was largely uncorrelated with floral traits (petal color, size, nectar traits) suggesting it can evolve independently. Darker pollen grains were larger and had higher anthocyanin content (cyanidin and peonidin) which may explain why they outperform light pollen under heat stress. Overall, pollen-related fitness metrics were greater for dark pollen, and dark pollen sires generated seeds with higher germination potential. Conversely, light pollen plants produce 61% more flowers than dark, and 18% more seeds per fruit, suggesting a seed production advantage. Results indicate that light and dark morphs may achieve fitness through different means—dark morphs appear to have a pollen advantage while light morphs have an ovule advantage—helping to explain the maintenance of pollen color variation.
Data from: Significant differences in maternal carotenoid provisioning and effects on offspring fitness in Chinook salmon colour morphs
In oviparous species, maternal carotenoid provisioning can deliver diverse fitness benefits to offspring via increased survival, growth, and immune function. Despite demonstrated advantages of carotenoids, large intra‐ and interspecific variation in carotenoid utilization exists, suggesting trade‐offs associated with carotenoids. In Chinook salmon (Oncorhynchus tshawytscha), extreme variation in carotenoid utilization delineates two colour morphs (red and white) that differ genetically in their ability to deposit carotenoids into tissues. Here, we take advantage of this natural variation to examine how large differences in maternal carotenoid provisioning influence offspring fitness. Using a full‐factorial breeding design crossing morphs and common‐garden rearing, we measured differences in a suite of fitness‐related traits, including survival, growth, viral susceptibility, and host response, in offspring of red (carotenoid‐rich eggs) and white (carotenoid‐poor eggs) females. Eggs of red females had significantly higher carotenoid content than those of white females (6X more); however, this did not translate into measurable differences in offspring fitness. Given that white Chinook salmon may have evolved to counteract their maternal carotenoid deficiency, we also examined the relationship between egg carotenoid content and offspring fitness within each morph separately. Egg carotenoids only had a positive effect within the red morph on survival to eyed‐egg (earliest measured trait), but not within the white morph. While previous work shows that white females benefit from reduced egg predation, our study also supports a hypothesis that white Chinook salmon have evolved additional mechanisms to improve egg survival despite low carotenoids, providing novel insight into evolutionary mechanisms that maintain this stable polymorphism.
Data from: Fitness differences between parapatric lake and stream stickleback revealed by a field transplant
Molecular comparisons of populations diverging into ecologically different environments often reveal strong differentiation in localized genomic regions, with the remainder of the genome being weakly differentiated. This pattern of heterogeneous genomic divergence, however, is rarely connected to direct measurements of fitness differences among populations. We here do so by performing a field enclosure experiment in threespine stickleback fish residing in a lake and in three replicate adjoining streams, and displaying weak yet heterogeneous genomic divergence between these habitats. Tracking survival over 29 weeks, we consistently find that lake genotypes transplanted into the streams suffer greatly reduced viability relative to local stream genotypes and that the performance of F1 hybrid genotypes is intermediate. This observed selection against migrants and hybrids combines to a total reduction in gene flow from the lake into streams of around 80%. Overall, our study identifies a strong reproductive barrier between parapatric stickleback populations, and cautions against inferring weak fitness differences between populations exhibiting weak overall genomic differentiation.
Data for: Genotypes selected for early and late avian lay date differ in their phenotype, but not fitness, in the wild
<p><span>Global warming has shifted phenological traits in many species, but whether species are able to track further increasing temperatures depends on the fitness consequences of additional shifts in phenological traits. To test this, we conducted a genomic selection experiment on wild great tits from the Hoge Veluwe study population (The Netherlands) to obtain great tits (<em>Parus</em> <em>major</em>) with genotypes for extremely early and late egg lay dates and measured phenology and fitness of selected great tit females under wild conditions.</span></p> <p><span>Females with early genotypes advanced lay dates relative to females with late genotypes, but not relative to non-selected females. Females with early and late genotypes did not differ in the number of fledglings produced, in line with the weak effect of lay date on the number of fledglings produced by non-selected females in the years of the experiment. Our study is the first application of genomic selection in the wild and led to an asymmetric phenotypic response that indicates the presence of constraints toward early, but not late, lay dates.</span></p>
A Comparison of a Currently Marketed Hearing Aid Programmed With Two Different Fitting Methods
ClinicalTrials.gov study NCT03498274. IPD Sharing: NO. Countries: 1. Publications: 1.
Differences in Ventilatory Function, Body Composition, and Cardiorrespiratory Fitness According to Training Status
ClinicalTrials.gov study NCT06246760. IPD Sharing: NO. Countries: 1. Publications: 2.
Changes in Movement, Fitness, and Quality of Life in People With Parkinson's Disease After Different Exercise Programs
ClinicalTrials.gov study NCT07221266. IPD Sharing: YES. Countries: 1. Publications: 9.
Data for: Genotypes selected for early and late avian lay date differ in their phenotype, but not fitness, in the wild
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Data from: Significant differences in maternal carotenoid provisioning and effects on offspring fitness in Chinook salmon colour morphs
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Pollen color morphs take different paths to fitness
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Data from: Symposium article: Which line to follow? the utility of different line-fitting methods to capture the mechanism of morphological scaling
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Data from: Intra- and intersexual differences in parasite resistance and female fitness tolerance in a polymorphic insect
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Data from: Fitness differences between parapatric lake and stream stickleback revealed by a field transplant
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Data from: Niche and fitness differences determine invasion success and impact in laboratory bacterial communities
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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