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44 results for “fluctuating asymmetry”
Fig. 2 in Fluctuating asymmetry and oxidative stress indicate environmental stress of Cane toads Rhinella marina
Fig. 2. а) Spatial conformation of landmarks to testing FA of the body of toads that consisted of 22 landmarks, where landmarks 1 and 12 were located on axis of the symmetry. b) The Procrustes consensus for all original and reflected configurations, being perfectly symmetric. c) The fluctuating asymmetry is shown as the difference between the averages of all original and reflected configurations (black dots). For comparison, the plot shows the overall symmetric (grey dots) and asymmetric Procrustes consensus and reflects variation of landmarks in left and right sides.
Fig. 1 in Fluctuating asymmetry and oxidative stress indicate environmental stress of Cane toads Rhinella marina
Fig. 1. Traits measured for fluctuating asymmetry assessment of the toad R. marina. Radius-Ulna (RU), Humerus (Hu), Femur (F), Tibia-Fibula (TF), Tarsal, Metatarsal, Phalange (TMPh 1,2,3,4,5), Abdomen (Ab), Head (He). We measured the distance from the right side (Rw) and left side (Lw).
Does fluctuating asymmetry of wing traits capture relative environmental stress in a lepidopteran?
<p></p> <p><b>Fluctuating asymmetry (FA) may be a useful predictor of population canalization, especially for organisms at risk from environmental change.</b></p> <ol> <li> <p><b>Identification of traits that meet statistical criteria as FA measures remains a challenge.</b></p> </li> <li> <p><b>In the present study, a laboratory experiment subjected immature butterflies (Vanessa cardui) to a range of diet and temperature conditions of varying stress levels. Variation in dietary macronutrient ratio (protein: carbohydrate) and rearing temperature (optimal: 25°C; elevated: 32°C) were introduced as stressors.</b></p> </li> <li> <p><b>Individuals subjected to stressful conditions were predicted to show elevated FA of three wing size traits.</b></p> </li> <li> <p><b>While FA of all three traits proved measurable, it did not vary across diet and temperature treatments. Instead, treatment levels impacted viability: the combined incidence of death prior to eclosion and expression of significant wing malformations increased in treatment levels predicted to increase FA. Variation in adult dry mass also reflected predicted stress levels. Results suggest that predicted FA variation was not found because individuals predicted to display increased FA either died or displayed gross developmental aberrations.</b></p> </li> <li> <p><b>This experiment illustrates important constraints on the investigation of FA, including selection of appropriate traits and identification of appropriate levels of stressors to avoid elevated mortality. The latter concern brings into question the utility of FA as an indicator of stress in vulnerable, natural populations, where stress levels are rarely controlled, and mortality and fitness effects are often not quantifiable.</b></p> </li> </ol>
Does stress mess with rodents' heads? Influence of habitat availability and genetic factors in mandible fluctuating asymmetry (FA) in South American water rats (Nectomys squamipes, Sigmodontinae) from Brazilian Atlantic rainforest remnants
<p>Loss of developmental stability can lead to deviations from bilateral symmetry (i.e. Fluctuating Asymmetry -FA), and is thought to be caused by environmental and genetic factors associated with habitat loss and stress. Therefore, levels of FA might be a valuable tool to monitor wild populations if FA serves an indicator of exposure to stress due to impacts of habitat loss and fragmentation. In studies examining FA and habitat fragmentation, FA levels are often explained by loss of genetic variation, though few studies have addressed FA's use as indicator of environmental impact. Here we investigated whether habitat loss, genetic variation and/or inbreeding affect the developmental instability in Brazilian Atlantic rainforest populations of a Neotropical water rat (Nectomys squamipes). We sampled individuals from eight forest remnants with different amounts of available habitat and assessed FA levels with geometric morphometric techniques using adult mandibles. We used observed heterozygosity (Ho) and inbreeding coefficient (Fis), from seven microsatellite markers, as a proxy of genetic variation at individual and population levels. Populations were not significantly different for shape or size FA levels. Furthermore inter-individual variation in both shape and size FA levels, as well as inter-populational differences in size FA levels, were best explained by chance. However, habitat availability was negatively associated with both inter-populational variance and average shape FA levels. This association was stronger in populations living in areas with less than 20% of habitat available, which presented higher variance and higher average of FA, suggesting that Nectomys squamipes might have a tolerance threshold to small availability of habitat. Our work was one of the first to use FA to address environmental stress caused by reduced habitat availability in small mammal populations from a Neotropical biome. We suggest that shape FA might serve as a conservation tool to monitor human impact on natural animal populations.</p>
Figure 1 in Fluctuating asymmetry in populations of the South American frog Physalaemus cuvieri (Leptodactylidae) in areas with different degrees of disturbance
Figure 1. Ecological Station of Minas Gerais Federal University (EEUFMG) and Serra do Cipó National Park (PNSC), located at Minas Gerais State, southeastern Brazil. State boundaries are represented by black lines, while rivers, lakes and sea are represented in grey. State capitals are represented by white circles.
Data from: Strong, nonlinear selection against fluctuating asymmetry in wild populations of a marine fish
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Patterns of fluctuating asymmetry in the limbs of freshwater turtles: are more functionally important limbs more symmetrical?
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<em>Nothofagus</em> hybridization and population structure reveals high fluctuating asymmetry in putative hybrids and surprisingly little differentiation between species
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Data from: Phenotypic plasticity in response to environmental heterogeneity contributes to fluctuating asymmetry in plants: first empirical evidence
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Data from: Fluctuating asymmetry and feather growth bars as biomarkers to assess habitat quality of shade coffee farming for avian diversity conservation
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Does stress mess with rodents’ heads? Influence of habitat availability and genetic factors in mandible fluctuating asymmetry (FA) in South American water rats (Nectomys squamipes, Sigmodontinae) from Brazilian Atlantic rainforest remnants
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Data from: Fluctuating asymmetry in Menidia beryllina before and after the 2010 DeepWater Horizon oil spill
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Does fluctuating asymmetry of wing traits capture relative environmental stress in a lepidopteran?
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Figure 2 from: Blanckenhorn WU (2021) A fungal parasite selects against body size but not fluctuating asymmetry in Swiss subalpine yellow dung flies. Alpine Entomology 5: 27-35. https://doi.org/10.3897/alpento.5.65653
Figure 2 Body size (top; here exemplified by wing length) and mean percentage of fluctuating asymmetry (FA; bottom) of all traits for unpaired (filled squares) and paired males (open squares) over the season.
Figure 3 from: Blanckenhorn WU (2021) A fungal parasite selects against body size but not fluctuating asymmetry in Swiss subalpine yellow dung flies. Alpine Entomology 5: 27-35. https://doi.org/10.3897/alpento.5.65653
Figure 3 Body size (here exemplified by hind tibia length) of unpaired (filled squares) and paired males (open squares) when they were infected by the fungus or not (all seasonal samples combined).
Figure 1 from: Blanckenhorn WU (2021) A fungal parasite selects against body size but not fluctuating asymmetry in Swiss subalpine yellow dung flies. Alpine Entomology 5: 27-35. https://doi.org/10.3897/alpento.5.65653
Figure 1 Proportion of male (filled squares) and female (open circles) flies infected by the fungus Entomophthora over the season 2002, with an infected specimen inset (photo Peter Jann).
Supplementary material 1 from: Blanckenhorn WU (2021) A fungal parasite selects against body size but not fluctuating asymmetry in Swiss subalpine yellow dung flies. Alpine Entomology 5: 27-35. https://doi.org/10.3897/alpento.5.65653
Table S1
Data from: Strategic exploitation of fluctuating asymmetry in male Endler's guppy courtship displays is modulated by social environment
Lateral asymmetry in signalling traits enables males to strategically exploit their best side. In many animals, both body colouration and fluctuating asymmetry are signals of male attractiveness. We demonstrated experimentally that even sexually naïve male Poecilia wingei were able to identify their most attractive side (i.e. that with a higher proportion of carotenoid pigmentation) and use it preferentially during courtship. Notably, males retained their strategic signalling in a male-biased social environment, whereas they ceased to signal strategically in a female-biased environment. The degree of asymmetry in colouration did not affect overall courtship activity. Strategic lateralization in courtship displays was strongest and most repeatable in the male-biased social environment where males competed with rivals for matings. Individual asymmetry in colouration changed considerably over a period of 3 months. This suggests that colouration is a dynamic feature during adulthood and that males are capable of tracking and strategically exploiting their lateral asymmetry in accordance with their social environment.
Fig. 1 in Fluctuating Asymmetry As A Tool In Identifying Population Stress In Hungarian Populations Of Bombina Bombina, B. Variegata And Their Hybrids
Fig. 1. Mean asymmetry compared among the two pure species and their hybrids for: a) femur and b) tibia length. Bars represent 95% confidence intervals
Figure 6 in Using digital images in the study of fluctuating asymmetry in the spur-thighed tortoise Testudo graeca
Figure 6. Regression plot with extreme variation in humeral scute area (HSA) for differences in left–right sides of the plastron due to malformations indicated by white arrows (SCL: straight carapace length; dashed line: standard deviation).
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.