Rapid industrialization and urbanization have accelerated the contamination of paddy soils with potentially toxic elements (PTEs). However, the status and the key factors responsible for the ...geographical variation in PTE concentrations in rice remain poorly understood. Here, a total of 113 pairs of soil and rice plant samples were collected from 19 provinces in four major rice producing areas of China to assess the geographical variation in total arsenic (As), cadmium (Cd) and lead (Pb) concentrations in the soil-rice system. Average total concentrations of As, Cd and Pb were 11.8, 0.45 and 25.7 mg kg−1, respectively, in the soils and 0.089, 0.087 and 0.036 mg kg−1 in the polished rice. The national maximum allowable concentrations of total soil As and Cd were exceeded in 6.19 and 33.6% of soils and that of Cd was exceeded in 7.96% of polished rice and no polished rice exceed the Pb limit. The As, Cd and Pb concentrations of rice were significantly and positively correlated (p < 0.05) with their corresponding soil available concentrations rather than with their soil total concentrations. Due to the combined effects of local rice varieties, cultivation of varieties with high Cd translocation factors and high Cd availability in acid soils, the highest rice Cd risk occurred in south China. The Cd concentrations in polished rice exceeded the maximum allowable by 4.0 and 15.8% in uncontaminated and contaminated soils, respectively. Results from 113 fixed samples may represent the actual current As, Cd and Pb status of rice in the main rice production areas nationally as they were very consistent with 574 random samples. In view of the high Cd contamination risk in acid soils of south China, countermeasures are needed to minimize Cd accumulation in rice crops in this region.
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•113 paired paddy soil and rice samples collected from 19 Chinese provinces•High geographical variation in soil and rice PTEs (As, Cd and Pb) concentrations•Rice grown in acid unpolluted soils in south China at risk of Cd contamination•Soil properties, PTEs availabilities and rice genotypes influenced plant PTEs uptake.
Venom geographical variation is common among venomous animals. This phenomenon presents problems in the development of clinical treatments and medicines against envenomation. The venomous giant ...jellyfish Nemopilema nomurai, Scyphozoan, is a blooming jellyfish species in the Yellow Sea and the East China Sea that causes numerous jellyfish sting cases every year. Metalloprotease and phospholipase A2 (PLA2) are the main components in Nemopilema nomurai venom and may activate many toxicities, such as hemolysis, inflammation and lethality. Geographical variation in the content and activity of these enzymes may cause different symptoms and therapeutic problems. For the first time, we verified metalloprotease and PLA2 geographical variation in Nemopilema nomurai venom by performing a comparative analysis of 31 venom samples by SDS-PAGE, analyzing protease zymography, enzymatic activity, and drawing contour maps. Band locations and intensities of SDS-PAGE and protease zymograms showed geographical differences. The enzymatic activities of both metalloprotease and PLA2 showed a trend of geographic regularity. The distribution patterns of these activities are directly shown in contour maps. Metalloproteinase activity was lower near the coast. PLA2-like activity was lower in the Southern Yellow Sea. We surmised that metalloproteinase and PLA2-like activities might be related to venom ontogeny and species abundance respectively, and influenced by similar environmental factors. This study provides a theoretical basis for further ecological and medical studies of Nemopilema nomurai jellyfish venom.
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•Nemopilema nomurai nematocyst venom (NnNV) geographical variation were verified.•NnNV metalloproteinase (MP) activity was lower near the coast.•NnNV PLA2 activity was lower in Southern Yellow Sea.•MP and PLA2 activities might be related to ontogeny and abundance respectively.
Plant temperature responses vary geographically, reflecting thermally contrasting habitats and long-term species adaptations to their climate of origin. Plants also can acclimate to fast temporal ...changes in temperature regime to mitigate stress. Although plant photosynthetic responses are known to acclimate to temperature, many global models used to predict future vegetation and climate–carbon interactions do not include this process.
We quantify the global and regional impacts of biogeographical variability and thermal acclimation of temperature response of photosynthetic capacity on the terrestrial carbon (C) cycle between 1860 and 2100 within a coupled climate–carbon cycle model, that emulates 22 global climate models.
Results indicate that inclusion of biogeographical variation in photosynthetic temperature response is most important for present-day and future C uptake, with increasing importance of thermal acclimation under future warming. Accounting for both effects narrows the range of predictions of the simulated global land C storage in 2100 across climate projections (29% and 43% globally and in the tropics, respectively).
Contrary to earlier studies, our results suggest that thermal acclimation of photosynthetic capacity makes tropical and temperate C less vulnerable to warming, but reduces the warming-induced C uptake in the boreal region under elevated CO2.
Because epidemiologic and environmental risk factors for nontuberculous mycobacteria (NTM) have been reported only infrequently, little information exists about those factors. The state of Virginia, ...USA, requires certain ecologic features to be included in reports to the Virginia Department of Health, presenting a unique opportunity to study those variables. We analyzed laboratory reports of Mycobacterium avium complex (MAC) and M. abscessus infections in Virginia during 2021-2023. MAC/M. abscessus was isolated from 6.19/100,000 persons, and 2.37/100,000 persons had MAC/M. abscessus lung disease. M. abscessus accounted for 17.4% and MAC for 82.6% of cases. Saturated vapor pressure was associated with MAC/M. abscessus prevalence (prevalence ratio 1.414, 95% CI 1.011-1.980; p = 0.043). Self-supplied water use was a protective factor (incidence rate ratio 0.304, 95% CI 0.098-0.950; p = 0.041). Our findings suggest that a better understanding of geographic clustering and environmental water exposures could help develop future targeted prevention and control efforts.
Studying species with wide geographical distributions allows the evaluation of the effects of environmental variation and phylogenetic constraints on the ecology of these organisms. The snake ...Tantilla melanocephala is widely distributed across South America in different environments (Amazonia, Atlantic Forest, Cerrado, Caatinga, and Chaco). We compared the morphology, diet, and reproduction of T. melanocephala inhabiting the northeastern Brazil in Atlantic Forest and Caatinga. In total, 161 individuals were collected from the Atlantic Forest and 88 were collected from Caatinga, and all had similar morphological and ecological traits. There was no sexual dimorphism within the biomes, and no morphological differences between individuals from both biomes. The species fed mainly on chilopods, and there were a few differences in the centipede species consumed in each biome. The volume of consumed prey did not differ between biomes, and clutch size was also similar (1-2 eggs), with differences during the egg-laying period reflecting environmental differences. The species has a continuous reproductive cycle in the Atlantic Forest and a seasonal reproductive cycle in Caatinga. Similarities in the morphology and ecology of T. melanocephala in the Atlantic Forest and Caatinga suggests that the species exhibits a high degree of phylogenetic conservatism.
Summary
We describe variation across geographical regions of England in operations undertaken following presentation of hip fracture and in 30-day mortality. Some significant geographic variation in ...30-day mortality was observed particularly for patients with trochanteric hip fractures and warrants further investigation of other aspects of post-hip fracture care
Introduction
Mortality after hip fracture has improved considerably in the UK over recent decades. Our aim here was to describe geographical variation in type of operation performed and 30-day mortality amongst patients in England with hip fracture.
Methods
The National Hip Fracture Database was used to carry out a prospective cohort study of nearly all over-60 year olds with hip fracture in England. These data were linked to Hospital Episode Statistics (HES), allowing us to explore regional variation in the operations performed for three fracture types (intracapsular, trochanteric and subtrochanteric), and use logistic regression models adjusted for demographic and clinical factors to describe associated 30-day mortality.
Results
NHFD recorded data for 64,211 patients who underwent surgery in England during 2017. Most had an intracapsular (59%) or trochanteric fracture (35%), and we found significant geographical variation across regions of England in use of total hip replacement (THR) (ranging from 10.1 to 17.4%) for intracapsular fracture and in intermedullary nailing (ranging from 14.9 to 27.0%) of trochanteric fracture. Some geographical variation in mortality amongst intracapsular fracture patients was found, with slightly higher mortality in the East of England (adjusted odds ratio aOR: 1.22, 95% CI: 1.02–1.46). Trochanteric fractures showed slightly more variation, with higher 30-day mortality (aOR: 1.40, 95%CI: 1.05–1.88) in the East of England and significantly lower mortality in the North East (aOR: 0.65, 95%CI: 0.46–0.93).
Conclusions
We have identified regional differences in operation type and 30-day mortality amongst hip fracture patients in England. The relationship between surgical approach and mortality has been explored, but the extent to which differential mortality reflects variation in approach to medical assessment, anaesthesia and other aspects of care warrants further investigation.
We present the first comprehensive set of estimates of variation in intergenerational social mobility across regions of Great Britain using data from the UK Labour Force Survey. Unlike the Social ...Mobility Index produced by the Social Mobility Commission, we focus directly on variation in measures of intergenerational social class mobility between the regions in which individuals were brought up. We define regions using the NUTS classification and we consider three levels, from 11 large NUTS1 regions, to 168 NUTS3 regions, across England, Wales, and Scotland. We investigate whether it is possible to form an index of social mobility from these measures and we address a neglected question: how much does the region in which someone was raised matter in comparison with the social class in which they were raised?
Abstract
Continuous phenotypic variation reflecting geographical clines can be difficult to distinguish from subspecific discontinuities when specimens are few and heterogeneously distributed. ...Nonetheless, increases in the holdings of museum collections over recent decades contribute to our ability to resolve more fine-scaled phenotypic gradients for many species. Although the big-eared woolly bat (Chrotopterus auritus) is not commonly encountered and thus poorly represented in museum collections, sufficient numbers have accumulated to allow an assessment of subspecific, sexual, spatial and environmental components of phenotypic variation. I examined 123 specimens from across the distribution of C. auritus and characterized the phenotype based on external, cranial and mandibular characteristics. I decomposed variation into components based on univariate and multivariate statistical analyses. All components accounted for significant phenotypic variation. Nonetheless, when examined together and after accounting for correlated variation among components, only sexual, spatial and environmental components accounted for significant unique variation. This, combined with the observation that all qualitative characteristics used to define subspecies of C. auritus can be observed throughout its geographical range, suggest that phenotypic variation is clinal and not characterized by discontinuities reflective of subspecies. Clinal variation was most strongly related to temperature and its seasonality, highlighting the important role played by these climatic characteristics in many aspects of the biology of Phyllostomidae.
Comparative studies of animal communication systems are particularly important for understanding the origins and evolution of core features of human language like syntax and dialects. Recent studies ...have begun to develop bats as models for investigating shared traits with human language, given the complex social vocalizations of the former. Our previous research revealed that bat social calls contained almost 20 syllable types and the occurrence of these syllable types in the call sequences followed certain permutation rules. However, the differences in these patterns between populations remain unclear. Here, we examined the syntactic patterns of social calls in greater horseshoe bats, Rhinolophus ferrumequinum, from three geographically distant populations in China. The aggressive calls and behaviours during agonistic interactions of 26 bats were analysed to examine the consistency and variation between two aggression levels and across three populations. Common types of syllables, transitions and sequence patterns were found in all three populations. However, there were significant differences in the occurrence frequencies of shared syllable types, transition types and sequence types. Further, more noisy and composite syllables occurred when aggression was high than when it was low. There were also more transitions between noisy syllables and more repetitions in calls in a high aggression than in a low aggression context. The universal syntactic patterns and differences in social vocalizations of bats across different populations are of interest for fields of animal communication and language evolution.
•Shared acoustic elements and patterns existed in social calls across populations.•Occurrence frequencies of vocalization types were different between populations.•High aggression calls were more noisy and complex than low aggression calls.
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