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Huan Jing Ke Xue= Huanjing Kexue Oct 2022The succession of dominant species always occurs during cyanobacterial blooms because there are certain conditions for cyanobacterial blooms formed by different...
The succession of dominant species always occurs during cyanobacterial blooms because there are certain conditions for cyanobacterial blooms formed by different cyanobacteria; this results in more uncertain and complex effects in cyanobacterial blooms. However, the succession pattern and consequences of dominant species and its driving factors have not received enough attention during cyanobacteria blooms. In this study, the phytoplankton community characteristics and water environment factors of Nanpeng Reservoir, a drinking water source in Chongqing, were monitored and analyzed from April to September 2018. The results showed that:① a total of 108 species of phytoplankton belonging to 59 genera and 8 phyla were identified in Nanpeng Reservoir. Of this, 13 species of 4 phyla were identified as dominant species, among which the dominance index of was the highest, followed by that of sp. ② The most dominant cyanobacteria were and in May and July, respectively, in which cyanobacteria density peaked, whereas the Shannon-Weiner diversity and Pielou evenness were significantly lower than those in the other months. ③ NMDS results showed that the correlation between or and the ambient phytoplankton community was 0.58 and 0.48, respectively. Moreover, the VPA results showed that 47.51% of the community variation could be explained by environmental factors, and only 12.04% and 12.74% of variation in community composition could be explained by and , respectively. ④ The abundance of was significantly positively affected by WT, pH, and RUE and negatively affected by SD and RUE. However, the abundance of was significantly positively affected by permanganate index and negatively affected by EC and DO. These results suggested that both dominating cyanobacteria had significant effects on the surrounding phytoplankton community. Relative to that of , however, had a more obvious impact on the aquatic ecosystem. Moreover, the synergistic effect of N limitation and warming of the water column may have caused the replacement of with to form a dominant population.
Topics: Cyanobacteria; Drinking Water; Ecosystem; Eutrophication; Phytoplankton
PubMed: 36224134
DOI: 10.13227/j.hjkx.202112249 -
International Journal of Environmental... Nov 2022Monodominant (one species dominates) or polidominant (multiple species dominate) cyanobacterial blooms are pronounced in productive freshwater ecosystems and pose a...
Monodominant (one species dominates) or polidominant (multiple species dominate) cyanobacterial blooms are pronounced in productive freshwater ecosystems and pose a potential threat to the biota due to the synthesis of toxins. Seasonal changes in cyanobacteria species and cyanometabolites composition were studied in two shallow temperate eutrophic lakes. Data on cyanobacteria biomass and diversity of dominant species in the lakes were combined with chemical and molecular analyses of fifteen potentially toxin-producing cyanobacteria species (248 isolates from the lakes). Anatoxin-a, saxitoxin, microcystins and other non-ribosomal peptides formed the diverse profiles in monodominant () and polidominant (, spp. and ) lakes. However, the harmfulness of the blooms depended on the ability of the dominant species to synthesize cyanometabolites. It was confirmed that . produced a greater amount and diverse range of MCs and other NRPs. In the polidominant lake, isolates of the co-dominant . , . and . synthesized no or only small amounts of cyanometabolites. In general, the profile of cyanometabolites was greater in cyanobacteria isolates than in environmental samples, indicating a high potential for toxic cyanobacteria bloom.
Topics: Lakes; Ecosystem; Cyanobacteria; Biota; Biomass
PubMed: 36430059
DOI: 10.3390/ijerph192215341 -
Cell Host & Microbe Jul 2023Longitudinal microbiome data provide valuable insight into disease states and clinical responses, but they are challenging to mine and view collectively. To address...
Longitudinal microbiome data provide valuable insight into disease states and clinical responses, but they are challenging to mine and view collectively. To address these limitations, we present TaxUMAP, a taxonomically informed visualization for displaying microbiome states in large clinical microbiome datasets. We used TaxUMAP to chart a microbiome atlas of 1,870 patients with cancer during therapy-induced perturbations. Bacterial density and diversity were positively associated, but the trend was reversed in liquid stool. Low-diversity states (dominations) remained stable after antibiotic treatment, and diverse communities had a broader range of antimicrobial resistance genes than dominations. When examining microbiome states associated with risk for bacteremia, TaxUMAP revealed that certain Klebsiella species were associated with lower risk for bacteremia localize in a region of the atlas that is depleted in high-risk enterobacteria. This indicated a competitive interaction that was validated experimentally. Thus, TaxUMAP can chart comprehensive longitudinal microbiome datasets, enabling insights into microbiome effects on human health.
Topics: Humans; Gastrointestinal Microbiome; Microbiota; Anti-Bacterial Agents; Bacteria; Bacteremia
PubMed: 37329880
DOI: 10.1016/j.chom.2023.05.027 -
Frontiers in Microbiology 2021Plant microbiomes play an important role in agricultural productivity, but there is still much to learn about their provenance, diversity, and organization. In order to...
Plant microbiomes play an important role in agricultural productivity, but there is still much to learn about their provenance, diversity, and organization. In order to study the role of vertical transmission in establishing the bacterial and fungal populations of juvenile plants, we used high-throughput sequencing to survey the microbiomes of seeds, spermospheres, rhizospheres, roots, and shoots of the monocot crops maize (B73), rice (Nipponbare), switchgrass (Alamo), , wheat, sugarcane, barley, and sorghum; the dicot crops tomato (Heinz 1706), coffee (Geisha), common bean (G19833), cassava, soybean, pea, and sunflower; and the model plants (Columbia-0) and (Bd21). Unsterilized seeds were planted in either sterile sand or farm soil inside hermetically sealed jars, and after as much as 60 days of growth, DNA was extracted to allow for amplicon sequence-based profiling of the bacterial and fungal populations that developed. Seeds of most plants were dominated by Proteobacteria and Ascomycetes, with all containing operational taxonomic units (OTUs) belonging to and . All spermospheres also contained DNA belonging to , , and . Despite having only seeds as a source of inoculum, all plants grown on sterile sand in sealed jars nevertheless developed rhizospheres, endospheres, and phyllospheres dominated by shared Proteobacteria and diverse fungi. Compared to sterile sand-grown seedlings, growth on soil added new microbial diversity to the plant, especially to rhizospheres; however, all 63 seed-transmitted bacterial OTUs were still present, and the most abundant bacteria (, , , , and ) were the same dominant seed-transmitted microbes observed in sterile sand-grown plants. While most plant mycobiome diversity was observed to come from soil, judging by read abundance, the dominant fungi ( and ) were also vertically transmitted. Seed-transmitted fungi and bacteria appear to make up the majority of juvenile crop plant microbial populations by abundance, and based on occupancy, there seems to be a pan-angiosperm seed-transmitted core bacterial microbiome. Further study of these seed-transmitted microbes will be important to understand their role in plant growth and health, as well as their fate during the plant life cycle and may lead to innovations for agricultural inoculant development.
PubMed: 34745040
DOI: 10.3389/fmicb.2021.737616 -
International Journal of Sports... 2022The Lower Quarter Y-Balance Test (YBT-LQ) has been shown to be reliable for assessing dynamic balance in children and adolescents. However, limited research is available...
BACKGROUND
The Lower Quarter Y-Balance Test (YBT-LQ) has been shown to be reliable for assessing dynamic balance in children and adolescents. However, limited research is available about the effects of leg dominance on YBT-LQ performance in adolescents. In addition, there is no consensus on the use of maximum reach or mean reach distance being a better measure of YBT-LQ performance.
HYPOTHESIS/PURPOSE
The purposes of this study were to determine if there is a difference in the YBT-LQ performance between the dominant and non-dominant limbs in non-athlete adolescents, and to compare the reliability of the maximum reach scores to that of the mean reach scores in this population.
STUDY DESIGN
Prospective cohort study.
METHODS
Twenty-six healthy non-athlete adolescents (13.6 ± 1.0 years, 22 girls, 4 boys) performed the YBT-LQ on two separate days while the same investigator scored their performance. Paired -tests were used to compare reach distances on dominant and non-dominate stance limbs. Intraclass correlation coefficients (ICC) were calculated for the maximum and mean reach distances for three directions (anterior, posterolateral, posteromedial) and the composite scores on each limb.
RESULTS
There was no significant difference in YBT-LQ performance between dominant and non-dominant stance limbs ( > 0.05). Overall, the between-day intra-rater reliability for maximum reach and mean reach scores was moderate-to-good for both limbs (ICC = 0.59 - 0.83), but was poor for the composite score on the dominant limb (ICC = 0.42) and maximum anterior reach on non-dominant limb (ICC = 0.48).
CONCLUSION
Limb dominance does not seem to be a factor for YBT-LQ performance in this population. The YBT-LQ appears to be a reliable tool for dynamic balance assessment in non-athlete adolescents using the individual score of each direction. The use of mean reach measures seems to slightly improve reliability, specifically the anterior reach direction, in this population.
LEVEL OF EVIDENCE
Level 2b.
PubMed: 35136685
DOI: 10.26603/001c.30996 -
Translational Vision Science &... Mar 2023To propose new methods for eye selection in presbyopic monovision corrections.
PURPOSE
To propose new methods for eye selection in presbyopic monovision corrections.
METHODS
Twenty subjects with presbyopia performed two standard methods of binary eye dominance identification (sensory with +1.50 diopters [D ]and +0.50 D and sighting with "hole-in-the-card") and two psychophysical methods of perceived visual quality: (1) the Preferential test, 26 natural images were judged with the near addition in one eye or in the other in a 2-interval forced-choice task, and the Eye Dominance Strength (EDS) defined as the proportion of trials where one monovision is preferred over the other; (2) the Multifocal Acceptance Score (MAS-2EV) test, the perceived quality of a natural images set (for 2 luminance levels and distances) was scored and EDS defined as the score difference between monovision in one eye or the other. Left-eye and right-eye dominance are indicated with negative and positive values, respectively. Tests were performed using a Simultaneous Vision Simulator, which allows rapid changes between corrections.
RESULTS
Standard sensory and sighting dominances matched in only 55% of subjects. The Preferential EDS (ranging from -0.7 to +0.9) and MAS-2EV EDS (ranging from -0.6 to +0.4) were highly correlated. Selecting the eye for far in monovision with the MAS-2EV, sensory, or sighting tests would have resulted in 79%, 64%, and 43% success considering the Preferential test as the gold standard.
CONCLUSIONS
Tests based on perceptual preference allow selection of the preferred monovision correction and measurement of dominance strength.
TRANSLATIONAL RELEVANCE
The binocular visual simulator allows efficient implementation of eye preference tests for monovision in clinical use.
Topics: Humans; Vision, Monocular; Visual Acuity; Dominance, Ocular; Vision, Ocular; Vision Tests
PubMed: 36939712
DOI: 10.1167/tvst.12.3.18 -
The Journal of Sexual Medicine Mar 2021Recent research has indicated that participation in BDSM (bondage-discipline, dominance-submission, and/or sadism-masochism) is not associated with psychological...
BACKGROUND
Recent research has indicated that participation in BDSM (bondage-discipline, dominance-submission, and/or sadism-masochism) is not associated with psychological distress or psychopathology but that sexual roles may be associated with personality characteristics, specifically interpersonal dominance and empathy.
AIM
The present study examined potential differences between those who identify as dominant, switch, and submissive on interpersonal dominance and empathy.
METHODS
Individuals who identified as members of the BDSM community were recruited online via a social networking site.
MAIN OUTCOME MEASURES
Self-reported demographic variables, the Personality Assessment Inventory, Dominance subscale, and the Interpersonal Reactivity Index Empathic Concern subscale.
RESULTS
Participants were well distributed across sexual roles (n = 279; 25.4% dominant, 38% submissive, 36.6% switch), identified as primarily female (59.5%), primarily heterosexual (53.4%), and the most common age group was 25-34 years (27.2%). BDSM role was associated with scores on the Dominance subscale; dominant BDSM practitioners scored significantly higher on the Dominance scale than switches, who in turn scored significantly higher than submissives (dominant mean [M] = 61.44, standard deviation [SD] = 8.26; switch M = 53.99, SD = 11.18, P < .01; submissive M = 49.41, SD = 11.46, P < .01). There were no differences on the measure of empathy between dominant, submissive, and switch BDSM practitioners. On average, individuals who identified as submissives and switches scored in the average range on the Dominance scale compared with the normative sample, and individuals who identified as dominants scored higher but not in the markedly elevated range.
CLINICAL IMPLICATIONS
The study provides information on the relationship between interpersonal dominance as a personality trait and dominance as a sexual role and has implications for reducing stigma related to these practices.
STRENGTHS AND LIMITATIONS
The study contributes to the growing literature suggesting that while BDSM roles may correspond with specific personality characteristics, they are not indicative of personalities significantly different than the general population's. The study also included individuals who identified as switch, a group often excluded from quantitative research in the BDSM community. The sample was, however, recruited exclusively online, and findings may not be applicable to all BDSM practitioners.
CONCLUSION
These findings suggest that there are no differences in empathy between BDSM practitioner roles, and although there are differences in interpersonal dominance, these characteristics are not likely to be prominent in individuals' everyday interactions. Jansen KL, Fried AL, Chamberlain J. An Examination of Empathy and Interpersonal Dominance in BDSM Practitioners. J Sex Med 2021;18:549-555.
Topics: Adult; Empathy; Female; Humans; Interpersonal Relations; Masochism; Sadism; Sexual Behavior; Surveys and Questionnaires
PubMed: 33547018
DOI: 10.1016/j.jsxm.2020.12.012 -
The Journal of Animal Ecology Apr 2020Researchers studying mammals have frequently interpreted earlier or faster rates of ageing in males as resulting from polygyny and the associated higher costs of...
Researchers studying mammals have frequently interpreted earlier or faster rates of ageing in males as resulting from polygyny and the associated higher costs of reproductive competition. Yet, few studies conducted on wild populations have compared sex-specific senescence trajectories outside of polygynous species, making it difficult to make generalized inferences on the role of reproductive competition in driving senescence, particularly when other differences between males and females might also contribute to sex-specific changes in performance across lifespan. Here, we examine age-related variation in body mass, reproductive output and survival in dominant male and female meerkats, Suricata suricatta. Meerkats are socially monogamous cooperative breeders where a single dominant pair virtually monopolizes reproduction in each group and subordinate group members help to rear offspring produced by breeders. In contrast to many polygynous societies, we find that neither the onset nor the rate of senescence in body mass or reproductive output shows clear differences between males and females. Both sexes also display similar patterns of age-related survival across lifespan, but unlike most wild vertebrates, survival senescence (increases in annual mortality with rising age) was absent in dominants of both sexes, and as a result, the fitness costs of senescence were entirely attributable to declines in reproductive output from mid- to late-life. We suggest that the potential for intrasexual competition to increase rates of senescence in females-who are hormonally masculinized and frequently aggressive-is offset by their ability to maintain longer tenures of dominance than males, and that these processes when combined lead to similar patterns of senescence in both sexes. Our results stress the need to consider the form and intensity of sexual competition as well as other sex-specific features of life history when investigating the operation of senescence in wild populations.
Topics: Aging; Animals; Breeding; Female; Herpestidae; Longevity; Male; Reproduction; Sexual Behavior, Animal
PubMed: 31943191
DOI: 10.1111/1365-2656.13173 -
The Science of the Total Environment Aug 2021The first and limiting step of nitrification is catalyzed by ammonia-oxidizing archaea (AOA) and bacteria (AOB). Recently, complete ammonia oxidizers (comammox...
The first and limiting step of nitrification is catalyzed by ammonia-oxidizing archaea (AOA) and bacteria (AOB). Recently, complete ammonia oxidizers (comammox Nitrospira) have been discovered to perform complete nitrification in one cell, yet their role in soil nitrification is still unclear. This study investigated the abundance and contribution of aerobic ammonia oxidizers in typical soil habitats, and assessed the role of comammox Nitrospira in ammonia-oxidizing communities. The results showed that comammox Nitrospira were dominant in 70% of the samples and their abundance displayed a significant positive correlation with nitrification potential. The median amoA gene transcription level of comammox Nitrospira exceeded that of AOA and AOB in in-situ soils. The abundance of comammox Nitrospira was negatively correlated with soil pH, dominating in 84% of soil samples with pH < 6.17. The results challenge the role of AOA and AOB in soils, highlighting the importance of comammox Nitrospira in soil nitrification, especially in acid soils. This work supports better understanding and regulation of the soil nitrogen cycle.
Topics: Ammonia; Archaea; Bacteria; Nitrification; Oxidation-Reduction; Phylogeny; Soil; Soil Microbiology
PubMed: 33765470
DOI: 10.1016/j.scitotenv.2021.146558 -
Brain and Behavior May 2024Living in a social dominance hierarchy presents different benefits and challenges for dominant and subordinate males and females, which might in turn affect their...
BACKGROUND
Living in a social dominance hierarchy presents different benefits and challenges for dominant and subordinate males and females, which might in turn affect their cognitive needs. Despite the extensive research on social dominance in group-living species, there is still a knowledge gap regarding how social status impacts brain morphology and cognitive abilities.
METHODS
Here, we tested male and female dominants and subordinates of Neolamprologus pulcher, a social cichlid fish species with size-based hierarchy. We ran three executive cognitive function tests for cognitive flexibility (reversal learning test), self-control (detour test), and working memory (object permanence test), followed by brain and brain region size measurements.
RESULTS
Performance was not influenced by social status or sex. However, dominants exhibited a brain-body slope that was relatively steeper than that of subordinates. Furthermore, individual performance in reversal learning and detour tests correlated with brain morphology, with some trade-offs among major brain regions like telencephalon, cerebellum, and optic tectum.
CONCLUSION
As individuals' brain growth strategies varied depending on social status without affecting executive functions, the different associated challenges might yield a potential effect on social cognition instead. Overall, the findings highlight the importance of studying the individual and not just species to understand better how the individual's ecology might shape its brain and cognition.
Topics: Animals; Cichlids; Female; Male; Executive Function; Brain; Social Dominance; Reversal Learning; Memory, Short-Term
PubMed: 38680075
DOI: 10.1002/brb3.3484