Habitat heterogeneity favors asexual reproduction in natural populations of grassthrips

Partial Clonality Expands the Opportunity for Spatial Adaptation

AbstractReproductive mode may strongly impact adaptation in spatially varying populations linked by dispersal, especially when sexual and clonal offspring differ in dispersal. We determined how spatial structure affects adaptation in populations with mixed clonal and sexual reproduction. In a source-sink quantitative genetic deterministic model (with stabilizing selection around different optima), greater clonal reproduction or parent-offspring association (a measure of the part of the parent's phenotype other than the additive genetic component inherited by clonal offspring) increased the selective difference (difference between phenotypic optima) allowing sink populations to adapt. Given dispersal differences between clonally and sexually produced juveniles, adaptation increased with an increasing fraction of clonal dispersers. When considering migrational meltdown, partially clonal reproduction reduced cases where dispersal caused habitat loss. Stochastic individual-based simulations support these results, although the effect of differential dispersal was reversed, with decreased clonal dispersal allowing greater adaptation. These results parallel earlier findings that for an instantaneous shift in phenotypic optimum, increasing clonality allowed population persistence for a greater shift; here, selective change is spatial rather than temporal. These results may help explain the success of many partially clonal organisms in invading new habitats, complementing traditional explanations based on avoiding Allee effects.

The shrimp microsporidian Enterocytozoon hepatopenaei (EHP): Biology, pathology, diagnostics and control

Disease is a major limiting factor in the global production of cultivated shrimp. The microsporidian parasite Enterocytozoon hepatopenaei (EHP) was formally characterized in 2009 as a rare infection of the black tiger shrimp Penaeus monodon. It remained relatively unstudied until mid-2010, after which infection with EHP became increasingly common in the Pacific whiteleg shrimp Penaeus vannamei, by then the most common shrimp species farmed in Asia. EHP infects the hepatopancreas of its host, causing hepatopancreatic microsporidiosis (HPM), a condition that has been associated with slow growth of the host in aquaculture settings. Unlike other infectious disease agents that have caused economic losses in global shrimp aquaculture, EHP has proven more challenging because too little is still known about its environmental reservoirs and modes of transmission during the industrial shrimp production process. This review summarizes our current knowledge of the EHP life cycle and the molecular strategies that it employs as an obligate intracellular parasite. It also provides an analysis of available and new methodologies for diagnosis since most of the current literature on EHP focuses on that topic. We summarize current knowledge of EHP infection and transmission dynamics and currently recommended, practical control measures that are being applied to limit its negative impact on shrimp cultivation. We also point out the major gaps in knowledge that urgently need to be bridged in order to improve control measures.

Developmental exposure to Δ9-tetrahydrocannabinol (THC) causes biphasic effects on longevity, inflammation, and reproduction in aged zebrafish (Danio rerio)

Increased availability of cannabis and cannabinoid-containing products necessitates the need for an understanding of how these substances influence aging. In this study, zebrafish (Danio rerio) were exposed to different concentrations of THC (0.08, 0.4, 2 μM) during embryonic-larval development and the effects on aging were measured 30 months later and in the offspring of the exposed fish (F1 generation). Exposure to 0.08 μM THC resulted in increased male survival at 30 months of age. As the concentration of THC increased, this protective effect was lost. Treatment with the lowest concentration of THC also significantly increased egg production, while higher concentrations resulted in impaired fecundity. Treatment with the lowest dose of THC significantly reduced wet weight, the incidence of kyphosis, and the expression of several senescence and inflammatory markers (p16^ink4ab, tnfα, il-1β, il-6, pparα and pparγ) in the liver, but not at higher doses indicating a biphasic or hormetic effect. Exposure to THC did not affect the age-related reductions in locomotor behavior. Within the F1 generation, many of these changes were not observed. However, the reduction in fecundity due to THC exposure was worse in the F1 generation because offspring whose parents received high dose of THC were completely unable to reproduce. Together, our results demonstrate that a developmental exposure to THC can cause significant effects on longevity and healthspan of zebrafish in a biphasic manner.

Developmental exposure to cannabidiol (CBD) alters longevity and health span of zebrafish (Danio rerio)

Consumption of cannabinoid-containing products is on the rise, even during pregnancy. Unfortunately, the long-term, age-related consequences of developmental cannabidiol (CBD) exposure remain largely unknown. This is a critical gap given the established Developmental Origins of Health and Disease (DOHaD) paradigm which emphasizes that stressors, like drug exposure, early in life can instigate molecular and cellular changes that ultimately lead to adverse outcomes later in life. Thus, we exposed zebrafish (Danio rerio) to varying concentrations of CBD (0.02, 0.1, 0.5 μM) during larval development and assessed aging in both the F0 (exposed generation) and their F1 offspring 30 months later. F0 exposure to CBD significantly increased survival (~ 20%) and reduced size (wet weight and length) of female fish. While survival was increased, the age-related loss of locomotor function was unaffected and the effects on fecundity varied by sex and dose. Treatment with 0.5 μM CBD significantly reduced sperm concentration in males, but 0.1 μM increased egg production in females. Similar to other model systems, control aged zebrafish exhibited increased kyphosis as well as increased expression markers of senescence, and inflammation (p16^ink4ab, tnfα, il1b, il6, and pparγ) in the liver. Exposure to CBD significantly reduced the expression of several of these genes in a dose-dependent manner relative to the age-matched controls. The effects of CBD on size, gene expression, and reproduction were not reproduced in the F1 generation, suggesting the influence on aging was not cross-generational. Together, our results demonstrate that developmental exposure to CBD causes significant effects on the health and longevity of zebrafish.

Gut microbiota structure differs between honeybees in winter and summer

Adult honeybees harbor a specialized gut microbiota of relatively low complexity. While seasonal differences in community composition have been reported, previous studies have focused on compositional changes rather than differences in absolute bacterial loads. Moreover, little is known about the gut microbiota of winter bees, which live much longer than bees during the foraging season, and which are critical for colony survival. We quantified seven core members of the bee gut microbiota in a single colony over 2 years and characterized the community composition in 14 colonies during summer and winter. Our data show that total bacterial loads substantially differ between foragers, nurses, and winter bees. Long-lived winter bees had the highest bacterial loads and the lowest community α-diversity, with a characteristic shift toward high levels of Bartonella and Commensalibacter, and a reduction of opportunistic colonizers. Using gnotobiotic bee experiments, we show that diet is a major contributor to the observed differences in bacterial loads. Overall, our study reveals that the gut microbiota of winter bees is remarkably different from foragers and nurses. Considering the importance of winter bees for colony survival, future work should focus on the role of the gut microbiota in winter bee health and disease.

HUBUNGAN KETERATURAN KUNJUNGAN ANC (ANTENATAL CARE) DAN KEPATUHAN KONSUMSI TABLET FE DENGAN KEJADIAN ANEMIA PADA IBU HAMIL TRIMESTER III DI KECAMATAN MARON PROBOLINGGO

Background: Anemia during pregnancy as a risk factor for maternal and fetal health. The government has implemented iron tablet distribution for pregnant women to prevent anemia during pregnancy. Problems arasie due to non-compliance of pregnant women in consuming iron tablets.Objectives: The purpose of the study was to analyze the correlation between regularity of antenatal care visits (ANC), and comlpliance of iron tablets consumption with anemia in third trimester pregnant women.Method: The study used a case control study design. The samples were 30 consists of 15 cases and 15 control taken by simple random sampling method. This study correlated the regularity of ANC visits and compliance to consumption of iron tablets between regularity of antenatal care visits (ANC), and comlpliance of iron tablets consumption with anemia in third trimester pregnant women.The study was conducted in the working area of Maron Health Center Probolinggo in May – August 2018. Data were analyzed using chi square.Results: The results showed that the regularity of antenatal care visits (ANC) (p = 0.001; OR = 4) and compliance of iron tablets consumption (p = 0.001; OR = 3.46) related with anemia. Pregnant women who didn’t regularly visit ANC had 4 times greater risk of anemia, while non-comliance pregnant women consume iron tablets had 3,46 times greater risk of anemia.Conclusion: The regularity of ANC visits and compliance to iron tablet consumption were related to anemia in third trimester pregnant women.ABSTRAKLatar Belakang: Anemia selama kehamilan merupakan faktor risiko bagi kesehatan ibu dan janin. Pemerintah telah menerapkan distribusi tablet Fe untuk ibu hamil sebagai upaya pencegahan anemia selama kehamilan. Masalah timbul akibat ketidakteraturan ANC dan ketidakpatuhan ibu hamil dalam mengonsumsi tablet Fe.Tujuan: Tujuan penelitian untuk menganalisis hubungan keteraturan kunjungan Antenatal Care (ANC) dan kepatuhan konsumsi tablet Fe dengan kejadian anemia pada ibu hamil trimester IIIMetode: Menggunakan desain studi case controldengan besar sampel 30 yang terdiri dari 15 kasus dan 15 kontrol diambil dengan metode simple random sampling. Penelitian ini menghubungkan keteraturan kunjungan Antenatal Care (ANC) dan kepatuhan konsumsi tablet Fe dengan kejadian anemia pada ibu hamil trimester III.Penelitian dilakukan di wilayah kerja Puskesmas Maron Kabupaten Probolinggo pada bulan Mei–Agustus 2018. Analisis data yang digunakan adalah chi- square.Hasil: Hasil penelitian menunjukkan terdapat hubungan antara keteraturan kunjungan Antenatal Care (ANC) (p=0,001; OR=4) dan kepatuhan konsumsi tablet Fe (p=0,001; OR=3,46) dengan kejadian anemia. Ibu hamil yang tidak teratur melakukan kunjungan ANC memiliki risiko 4 kali lebih besar untuk mengalami anemia, sedangkan ibu hamil yang tidak patuh mengonsumsi tablet Fe berisiko 3,46 kali lebih besar untuk mengalami anemia.Kesimpulan: Keteraturan kunjungan ANC dan kepatuhan konsumsi tablet Fe berhubungan dengan kejadian anemia pada ibu hamil trimester III.

Where Did You Come From? Where Did You Go? Investigating the Origin of Invasive Leptocybe Species Using Distribution Modelling

Research Highlights: We present the first attempts to model the distributions of the two cryptic and globally invasive species of Leptocybe invasa sensu lato (Fisher & LaSalle) (Hymenoptera: Eulophidae) in its purported country of origin, namely Australia. Background and Objectives: Leptocybe invasa is an invasive eucalypt-galling wasp that spread quickly all over the world in the early to mid-2000’s, achieving significant pest status through its severe impacts on the growth and productivity of extra-limital eucalypt plantations. Until its discovery in Europe and the Middle East, the genus was undescribed, and its native range remains unclear. Molecular studies indicate the globally invasive population comprises two cryptic species with variable modes of reproduction. Collection records from Australia, the purported origin, represent only one of the invasive lineages, restricted to subtropical and tropical Queensland and northern New South Wales. To date, the original invasive lineage has not been found in Australia, despite searches over the seventeen years that it has been spreading overseas. Materials and Methods: To understand the distributions of the invasive populations, and to infer Leptocybe spp. native ranges within Australia, we used correlative niche modelling in Maximum Entropy (MaxEnt) and multivariate analysis, and created a CLIMEX model based on development rates of an invasive population. Results: We used the environmental conditions in the extra-limital range to infer possible origins, with our findings supporting the possibility that the invasive populations may have originated from different populations in Australia. Conclusions: We highlight the need for better understanding of the distribution, genetic diversity, and reproductive mode of the species within Australia. The variety of climatic niches occupied by invasive lineages of the wasp potentially present new threats to eucalypts in previously uninfested habitats.

Sex loss in insects: causes of asexuality and consequences for genomes

Boasting a staggering diversity of reproductive strategies, insects provide attractive models for the comparative study of the causes and consequences of transitions to asexuality. We provide an overview of some contemporary studies of reproductive systems in insects and compile an initial database of asexual insect genome resources. Insect systems have already yielded some important insights into various mechanisms by which sex is lost, including genetic, endosymbiont-mediated, and hybridization. Studies of mutation and substitution after loss of sex provide the strongest empirical support for hypothesized effects of asexuality, whereas there is mixed evidence for ecological hypotheses such as increased parasite load and altered niche breadth in asexuals. Most hypotheses have been explored in a select few taxa (e.g. stick insects, aphids), such that much of the great taxonomic breadth of insects remain understudied. Given the variation in the proximate causes of asexuality in insects, we argue for expanding the taxonomic breadth of study systems. Despite some challenges for investigating sex in insects, the increasing cost-effectiveness of genomic sequencing makes data generation for closely-related asexual and sexual lineages increasingly feasible.

Niche differentiation among clones in asexual grass thrips

Many asexual animal populations comprise a mixture of genetically different lineages, but to what degree this genetic diversity leads to ecological differences remains often unknown. Here, we test whether genetically different clonal lineages of Aptinothrips grass thrips differ in performance on a range of plants used as hosts in natural populations. We find a clear clone‐by‐plant species interactive effect on reproductive output, meaning that clonal lineages perform differently on different plant species and thus are characterized by disparate ecological niches. This implies that local clonal diversities can be driven and maintained by frequency‐dependent selection and that resource heterogeneity can generate diverse clone assemblies.

Sex in the wild: How and why field-based studies contribute to solving the problem of sex

Why and how sexual reproduction is maintained in natural populations, the so-called "queen of problems," is a key unanswered question in evolutionary biology. Recent efforts to solve the problem of sex have often emphasized results generated from laboratory settings. Here, we use a survey of representative "sex in the wild" literature to review and synthesize the outcomes of empirical studies focused on natural populations. Especially notable results included relatively strong support for mechanisms involving niche differentiation and a near absence of attention to adaptive evolution. Support for a major role of parasites is largely confined to a single study system, and only three systems contribute most of the support for mutation accumulation hypotheses. This evidence for taxon specificity suggests that outcomes of particular studies should not be more broadly extrapolated without extreme caution. We conclude by suggesting steps forward, highlighting tests of niche differentiation mechanisms in both laboratory and nature, and empirical evaluation of adaptive evolution-focused hypotheses in the wild. We also emphasize the value of leveraging the growing body of genomic resources for nonmodel taxa to address whether the clearance of harmful mutations and spread of beneficial variants in natural populations proceeds as expected under various hypotheses for sex.

Hubungan Antara Asupan Zat Gizi Makro dan Status Gizi dengan Kebugaran Jasmani Mahasiswa UKM Taekwondo

Background: Taekwondo is a physical activity or body movement that is conducted repeatedly with muscles as the most active organ. The problems that occurs to the athletes is the poor-organized consumption pattern, thus they lack of nutritional intake. The good nutritional intake is obtained from the sufficient nutritional intake so that the physical fitness becomes better. Meanwhile, young adults require sufficient nutritional intake so that their physical fitness can be better.Objective: This research aimed to analyze the relationship between the nutritional intake and nutrition status with the physical fitness of the university students joining the student activity unit of taekwondo in Universitas Airlangga Surabaya.Methods: This research was the analytical research with the cross-sectional design. The sample of the research was as many as 52 people who were acquired by utilizing the simple random sampling. The data collection included nutritional status by measuring the weight and height to figure out the Body Mass Index (BMI) and 2x24 hours food recall to understand the food intake.Results: The result demonstrated that there was a relationship between the nutritional status (p=0.014) and the intake of energy, protein, carbohydrate, and fat (p=0.05) had no relationship with the physical fitness.Conclusions: It could that the nutritional status was related to the physical fitness. The respondents who had normal nutrition status obtained the good physical fitness. There should be the addition of information regarding the nutrients to obtain the good nutritional status.ABSTRAKLatar Belakang: Taekwondo merupakan aktivitas fisik atau gerakan anggota tubuh yang dilakukan secara berulang dan organ yang paling aktif yaitu otot. Permasalah yang sering terjadi pada olahragawan yaitu suka konsumsi makanan yang tidak teratur sehingga asupan gizinya kurang tercukupi. Asupan gizi yang baik diperoleh dari asupan gizi yang cukup sehingga kebugaran jasmaninya baik.Tujuan: Tujuan dari penelitian ini adalah menganalisis hubungan antara asupan zat gizi makro dan status gizi dengan kebugaran jasmani mahasiswa UKM taekwondo.Metode: Penelitian ini menggunakan desain studi cross sectional dengan jumlah sampel 52 orang, diambil secara acak sederhana menggunakan simple random sampling. Pengumpulan data meliputi status gizi dengan cara penimbangan berat dan pengukuran tinggi badan untuk mengetahui Indeks Massa Tubuh (IMT), food recall 2x24 untuk mengetahui asupan makannya dan tes balke untuk kebugaran jasmani. Analisis data yang digunakan dalam penelitian ini adalah analisis univariat dan bivariat dengan menggunakan kolerasi pearson.Hasil: Hasil penelitian menunjukkan terdapat hubungan antara status gizi (p=0,014) dengan kebugaran jasmani sedangkan asupan energi, protein, karbohidrat dan lemak (P=0,05) tidak terdapat hubungan dengan kebugaran jasmani.Kesimpulan: Status gizi berhubungan dengan kebugaran jasmani. Responden yang memiliki status gizi normal cenderung memiliki kebugaran jasmani yang baik. Perlu dilakukan penambahan informasi terkait zat gizi agar tercipta status gizi yang baik.