Suppress Population Growth Research Articles

Loss-of-function in testis-specific serine/threonine protein kinase triggers male infertility in an invasive moth

Genetic biocontrol technologies present promising and eco-friendly strategies for the management of pest and insect-transmitted diseases. Although considerable advancements achieve in gene drive applications targeting mosquitoes, endeavors to combat agricultural pests have been somewhat restricted. Here, we identify that the testis-specific serine/threonine kinases (TSSKs) family is uniquely expressed in the testes of Cydia pomonella, a prominent global invasive species. We further generated male moths with disrupted the expression of TSSKs and those with TSSKs disrupted using RNA interference and CRISPR/Cas9 genetic editing techniques, resulting in significant disruptions in spermiogenesis, decreased sperm motility, and hindered development of eggs. Further explorations into the underlying post-transcriptional regulatory mechanisms reveales the involvement of lnc117962 as a competing endogenous RNA (ceRNA) for miR-3960, thereby regulating TSSKs. Notably, orchard trials demonstrates that the release of male strains can effectively suppress population growth. Our findings indicate that targeting TSSKs could serve as a feasible avenue for managing C. pomonella populations, offering significant insights and potential strategies for controlling invasive pests through genetic sterile insect technique (gSIT) technology.

Ecosystem engineering and food web stability

Ecosystem engineering, which involves organism-triggered physical modification of the environment, is a widespread phenomenon. Despite this, the role of engineering in ecological communities remains poorly understood. This study employs a food web model to uncover the key roles of ecosystem engineering in maintaining food webs. While engineers facilitating population growth and suppressing consumers’ foraging activity can help maintain complex communities with diverse species, engineering effects that suppress population growth and facilitate consumers’ foraging activity can largely destabilize community dynamics. Furthermore, in the middle levels of engineering-related species within a community, an increase in species richness can increase community stability, contrary to classical ecological prediction. The study findings suggest that ecosystem engineering can explain biodiversity persistence in nature, but it depends on the proportion of engineering-related species and how engineering affects organisms.

PENYULUHAN TENTANG PENGGUNAAN METODE KONTRASEPSI JANGKA PANJANG (MKJP) PADA WANITA USIA SUBUR

Long Term Contraceptive Method (MKJP) is a contraceptive method that works for a long time and has high effectiveness in preventing pregnancy. The use of contraception is one of the effective efforts in the Family Planning Program to control fertility or suppress population growth. In its implementation, efforts are made to ensure that all contraceptive methods or devices provided or offered to the public provide optimal benefits. In choosing a method, a woman must consider various factors, including health factors, potential side effects of a method, and the consequences of unwanted pregnancy. However, contraceptive use among women at young and old ages (risk age) is much lower than for women aged 20-39 years (non-risk age). Family Planning (KB) participants are women of childbearing age (WUS), one of whom uses contraceptive methods/methods for the purpose of preventing pregnancy or better known as acceptors. This community service implementation was carried out in Kediri Village Gading Rejo Districtand followed by 25 women of childbearing age. The methods used in health education are lecture, discussion and question and answer methods using flip sheets. It can be concluded that the education day regarding the use of MKJP can increase awareness and interest among women of childbearing age to choose to use long-term contraceptive methods and understand the many benefits of using long-term contraceptive methods.

Development of a sterile insect technique as a control strategy for the Asian citrus psyllid: establishing the effect of sterilizing X-rays on fecundity, fertility, and survival.

The Asian citrus psyllid (ACP), Diaphorina citri Kuwayama (Hemiptera: Psyllidae), is a major pest of citrus due to its role as the vector of the bacterium that causes huanglongbing. In commercial citrus, ACP control currently relies on the application of insecticides, which may not be sustainable long-term, nor practical in urban areas. The sterile insect technique (SIT) is an alternative strategy in which large numbers of pests are reared, sterilized using radiation, and then released into the field to compete with wild individuals for matings, suppressing population growth. As a fundamental step toward the development of SIT for ACP, this study sought to identify the optimum radiation dose required to sterilize ACP without affecting their survival and mating capacity. Virgin adult ACP of both sexes were subjected to doses of X-ray irradiation ranging from 40 to 480 Gy, then paired with a nonirradiated mate and allowed to produce offspring. Fecundity was estimated as the number of eggs laid, and fertility as the proportion of those eggs that hatched. Females were more radio-sensitive than males, exhibiting a major drop in fecundity at even the lowest dose and 100% sterility at 80 Gy. In contrast, a fivefold higher dose (400 Gy) did not achieve complete sterility in males, with around 5% offspring survival. However, F1 progeny of males exposed to 320 Gy or higher were subsequently found to be 100% sterile. This confirmation of inherited sterility suggests that balancing the sterilizing effects of radiation against its mortality-inducing effects may warrant further evaluation.

Identifying the generalizable controls on insect associations of native and non-native trees.

Trees growing outside their native geographic ranges often exhibit exceptional growth and survival due in part to the lack of co-evolved natural enemies that may limit their spread and suppress population growth. While most non-native trees tend to accumulate natural enemies over time, it remains uncertain which host and insect characteristics affect these novel associations and whether novel associations follow patterns of assembly similar to those of native hosts. Here, we used a dataset of insect-host tree associations in Europe to model which native insect species are paired with which native tree species, and then tested the model on its ability to predict which native insects are paired with which non-native trees. We show that native and non-native tree species closely related to known hosts are more likely to be hosts themselves, but that native host geographic range size, insect feeding guild, and sampling effort similarly affect insect associations. Our model had a strong ability to predict which insect species utilize non-native trees as hosts, but evolutionarily isolated tree species posed the greatest challenge to the model. These results demonstrate that insect-host associations can be reliably predicted, regardless of whether insect and host trees have co-evolved, and provide a framework for predicting future pest threats using a select number of easily attainable tree and insect characteristics.

Ecological determinants of spotted hyena Crocuta crocuta occupancy in Comoé National Park, Côte d’Ivoire

Knowledge of the large carnivore guild is important in view of a possible lion reintroduction into the Comoé National Park (CNP), northern Côte d’Ivoire. We used camera trapping to assess activity patterns, habitat selection, and ecological factors influencing the occupancy of the spotted hyena Crocuta crocuta. Our results showed that the presence of leopard Panthera pardus, the only current other large carnivore and thus potential competitor, did not influence hyena occupancy. Hyena occupancy was only significantly related to Euclidian distance to nearest water point. Manly’s alpha habitat selection index values show a preference of spotted hyena for shrub savannah (αSa = 0.71), and Pianka’s overlap index showed low spatial competition with leopard (OIJ(PNC) = 0.12). Our findings showed that spotted hyena were mostly nocturnal, and generally active at the same time slots with leopard, leading to a high index of temporal overlap (OIJ(time) = 0.78). The kernel density estimation confirmed that spotted hyenas and leopard shared almost half of their activity patterns (Δ1 = 0.49 and 95% CI = 0.26–0.71). Prey diversity is high in CNP but anthropogenic threats appear to suppress population growth of prey and predators. Conservation efforts should continue to reduce pressures before contemplating a potential lion Panthera leo reintroduction.

Upaya UPAYA PENINGKATAN PENGETAHUAN WANITA USIA SUBUR (WUS) TENTANG METODE KONTRASEPSI INTRAUTERINE DEVICE (IUD)

The use of contraception is one of the most effective efforts in the Family Planning Program to control fertility or suppress population growth. In its implementation, efforts are made to ensure that all contraceptive methods or devices provided or offered to the public provide optimal benefits. In choosing a method, a woman must weigh various factors, including health factors, potential side effects of a method, consequences of unwanted pregnancy. However, contraception use for women who are younger and older (age at risk) is much lower than women aged 20-39 years (age not at risk). Participants in Family Planning (KB), namely women of childbearing age (WUS) where one of them uses a method/method of contraception for the purpose of preventing pregnancy or better known as an acceptor. The implementation of this community service was carried out in the Pasar Simpang Health Center work area at the Simpang Simpang Regency, Lampung and was attended by 13 female respondents of childbearing age. The method used in health counseling is the lecture, discussion and question and answer method. In this activity pre and post tests were also carried out regarding the respondents' understanding of contraception.

A sublethal concentration of chitosan oligosaccharide suppresses the population growth of the wheat aphid, Rhopalosiphum padi (Linnaeus)

AbstractThe bird cherry‐oat aphid Rhopalosiphum padi (L.) (Hemiptera: Aphididae) is a key pest of wheat in China. Chitosan oligosaccharide (COS) has been widely used due to its biocompatibility, antibacterial activity, environmental friendliness and convenient extraction. This study was aimed at determining the acute toxicity of COS on R. padi and transgenerational effects of sublethal concentrations of COS on the biological characteristics of R. padi. The results indicated that COS possessed acute toxicity against R. padi after 48 h of exposure (LC50: 1227.35 mg/L). The sublethal concentration of COS (LC15: 260 mg/L) induced a decrease in adult longevity, adult prereproductive period and fecundity in the first filial generation (F1). Moreover, in F1 progeny, nymphal (1st–3rd), preadult and total prereproductive period significantly enhanced due to sublethal dose. Moreover, finite rate of increase (λ), the intrinsic rate of increase (r) and net reproductive rate (R0) of F1 progeny were significantly decreased, whereas a sublethal COS concentration exposure significantly increased the mean generation time (T) of F1 progeny. Overall, the study shows that sublethal concentration of COS can significantly suppress population growth of R. padi F1 generation, showing the potential of COS as a biorational option to manage aphids.

The Implementation of Family Planning program during the COVID-19 Pandemic: Scoping Review

Background:The family planning program in Indonesia has been started since 1957, but it was merely part of health issues. With the increasing population of Indonesian people, the high maternal mortality rate, and the need for reproductive health, family planning programs are then used as a way to suppress population growth and improve maternal and child health. According to the National Population and Family Planning Board (BKKBN), the primary problem in actualizing the target of family planning programs is the low participation of couples of childbearing age (EFA). Another problem currently emerging is the increasing number of family planning dropouts as a direct impact of the COVID-19 pandemic. Purpose: This study aimed to scrutinize the implementation of family planning programs during the COVID-19 pandemic. Methods: The method in this research was scoping review. The literature search in this study used 3 health journal databases, namely PubMed, ScienceDirect, ProQuest, and 1 search engine: Google Scholar. Articles were selected using inclusion criteria, which were Articles published in national and international journals from 2019 to 2021. The total search results were 274 articles, and 9 articles were found that met the inclusion criteria in the author's review. The instruments used to assess the quality of articles was The Joanna Briggs Institute (JBI) Critical Appraisal Tools.Results:The impact of family planning services in the COVID-19 pandemic era is a decrease in family planning participants in March 2020 when compared to February 2020 throughout Indonesia. Factors that affect family planning program services during the COVID-19 pandemic include : knowledge, Husband’s support, Support from health professionals. Conclusions:The conclusion from the nine articles is that several countries have experienced changes in the system of maternal and child health services and family planning services. Many countries encountered a decrease in family planning participants and the presence of unwanted pregnancies.

Controlling the Rate of Population Growth during a Pandemic

The population explosion is expected to occur in 2045 if a country needs to immediately address the problem of its population growth rate, including Indonesia. The wild population will hurt the government. Therefore, the population growth rate must be controlled so as not to burden the national economy and to minimize the negative impacts that will occur later. For this reason, the government made policies to suppress population growth in Indonesia. This research uses descriptive research with a qualitative approach. Data collection was carried out by observation, interview, and documentation methods. The research subjects were employees of the Family Planning Office and the Women's Empowerment Agency (KBPPPA Office), and the community. Proof of data validity using inspection techniques. The data analysis used is qualitative Analysis with the steps of data collection, data reduction, data presentation, and conclusion. The results obtained were that efforts to control the population growth rate through the family planning program in Tulungagung Regency had been going well. However, several inhibiting factors still existed, such as a need for more awareness from husbands and a few family planning extension officers.

Nanoplastics induce more severe multigenerational life-history trait changes and metabolic responses in marine rotifer Brachionus plicatilis: Comparison with microplastics

Micro/nanoplastics (MPs/NPs) have attracted global attention for their potential adverse impacts on marine ecosystems. This study investigated the impacts of MPs/NPs (70 nm, 500 nm, and 2 µm) on population growth and life-history traits of marine rotifer (Brachionus plicatilis), and further explored the differences from the aspects of nutrient accumulation and metabolomic profiles. The results showed that 200 and 2000 µg/L 70 nm NPs significantly suppressed population growth, and negatively affected life span, the first spawning and breeding time, and fecundity in F0–F2 generation rotifers. Whereas 500 nm NPs and 2 µm MPs showed no effect on population growth 200 µg/L and only changed the life-history traits at the highest concentration. Moreover, 70 nm NPs were more easily accumulated in the rotifers and reduced food ingestion and nutrient accumulation, which caused more severe disruption on purine-pyrimidine metabolism, tricarboxylic acid cycle, and protein synthesis pathway compared to 500 nm NPs. Thus, the smaller the size of the plastic particles, the stronger the toxicity to the rotifers. This study provided new insights into the toxicity of MPs/NPs on marine zooplankton and proposed that metabolomics was powerful to explore the toxicity mechanisms of MPs/NPs.

Analysis of Factors Affecting Poverty in North Sumatra Province (Period 2015-2020)

This study aims to determine and analyze the effect of economic growth, human development index, population growth, and unemployment rate on poverty in North Sumatra Province. The type of data used in this research is the type of quantitative data with secondary data. The object of this research is all regencies/cities in North Sumatra Province which consists of 33 regencies/cities. This study uses panel data, which combines time series and cross section data for 6 years, from 2015 to 2020. The data analysis method used in this study is the panel data regression analysis method with the Eviews10 analysis tool. The results of the research based on panel data regression analysis method show that economic growth, human development index, population growth, and unemployment rate have a simultaneous effect on poverty. Partially, economic growth has a negative and significant effect on poverty, the human development index has a negative and significant effect on poverty, population growth has a positive and significant effect on poverty, and the unemployment rate has a positive and significant effect on poverty. The policy implication in this research is that the government is expected to be more serious in creating an investment climate by developing Special Economic Zones (SEZ) and Industrial Estates (KI), improving government performance through the Family Hope Program (PKH), implementing Family Planning (KB) programs and delaying the age of birth. marriage to suppress population growth, and the use of Pre-Employment Cards to reduce unemployment. Keywords: Economic Growth, Human Development Index,Population Growth, Unemployment Rate, Poverty

Characterizing the lethal and sub-lethal effects of genetically modified soybean expressing Cry1A.105, Cry2Ab2, and Cry1Ac insecticidal proteins against Spodoptera species (Lepidoptera: Noctuidae) in Brazil.

MON 87701 × MON 89788 × MON 87751 × MON 87708 soybean, that expresses Cry1A.105, Cry2Ab2, and Cry1Ac insecticidal proteins and confers tolerance to glyphosate and dicamba, is a potential tool for managing Spodoptera species in soybean fields in Brazil. In this study, we characterized the lethal and sub-lethal effects of Cry1A.105/Cry2Ab2/Cry1Ac soybean against Spodoptera species and genotypes of Spodoptera frugiperda resistant and susceptible to Cry1 and Cry2 proteins. These evaluations were also conducted with MON 87701 × MON 89788 soybean, which expresses Cry1Ac protein. Cry1A.105/Cry2Ab2/Cry1Ac soybean caused high lethality in neonates of Spodoptera cosmioides and Spodoptera albula. However, it showed low lethality in S. frugiperda genotypes homozygous for resistance to Cry1 and Cry2 proteins but reduced their population growth potential. No relevant lethal effects of Cry1Ac soybean were detected in the Spodoptera species and genotypes evaluated. Spodoptera frugiperda genotypes heterozygous for Cry1 and Cry2 resistance were controlled by Cry1A.105/Cry2Ab2/Cry1Ac soybean, with no insects developing into adults. This Bt soybean also caused intermediate mortality of neonates of Spodoptera eridania (60%-83%) but no surviving larvae developed to adulthood, resulting in population suppression. Cry1A.105/Cry2Ab2/Cry1Ac soybean caused high mortality of S. cosmioides, S. albula, and S. frugiperda genotypes susceptible to Cry1 and Cry2 and heterozygous for Cry1 and Cry2 resistance. This Bt soybean also suppressed population growth of S. eridania but had minimal impact on S. frugiperda homozygous for resistance to Cry1 and Cry2 proteins. Cry1Ac soybean had minimal impact on all Spodoptera species and genotypes evaluated. © 2022 Society of Chemical Industry.

The Impact of Information Sources and Access to Health Facilities on the Continuity of Contraceptive Use

Background: The family planning program (Keluarga Berencana or KB) is one of the Indonesian government’s efforts to suppress population growth. The program focuses on contraceptive usage. However, in practice, the level of continuity of contraceptive use are still low. The purpose of this study is to analyze the effect of sources of information and access to health facilities on the continuity of contraceptive use.Method: This quantitative study with a cross-sectional design had 1,195 respondents with an age range of <20 years to >35 years. Data were collected through structured interviews and questionnaires. Univariate data analysis was conducted with frequency distribution; bivariate data analysis utilized crosstabs, and the multivariate analysis used logistic regression.Results: The continuity of contraceptive use was 91.9% among respondents who received information about the family planning program, either orally, on mass media, or electronically, and it was 82.8% among respondents who accessed family planning services. This study found that factors that influence the continuity of contraceptive use were sources of electronic media information (OR = 0.6633; 95% CI = 0.4852 – 0.9067; p = 0.010) and access to family planning services (OR = 2.677; 95% CI = 1.652 – 4.337; p = 0.001). These findings suggest that the sources of information and access to health facilities affect the continuity of contraceptive use.

Temporal Trends of Persistent Organic Pollutants in Sarasota Bay Common Bottlenose Dolphins (Tursiops truncatus)

Legacy persistent organic pollutants (POPs) were measured in blubber samples collected from 196 common bottlenose dolphins (Tursiops truncatus) from 2000 to 2016 in the Sarasota Bay, Florida, ecosystem. Legacy POPs included polychlorinated biphenyl congeners (ΣPCB; sum of 37 congeners or congener groups), dichloro-diphenyl-trichloroethane (DDT) and transformation products (ΣDDT), chlordane and related compounds (ΣChlor), mirex, polybrominated diphenyl ether congeners (ΣPBDE, sum of five congeners), dieldrin and hexachlorobenzene (HCB). All POP compounds or compound groups declined in dolphin blubber over the study period. POP classes declined at different rates within classifications (sex, adult or calf). For example, dieldrin decline in male dolphins was greatest (−13% per year) while HCB decline was lower (−6.3% per year). For individual POP classes, rates of decline depended on classification. For example, ΣPCB, the POP class present at the highest concentration relative to other POPs, declined at −8.4, −7.8, and −5.6% per year in adult females, adult males and calves, respectively. Overall POP declines were highest in adult males and lowest in calves. Declines in POP concentration with time based on individual dolphins resampled at different time points were consistent with declines calculated based on yearly or biennial cross-sections taken from 2000 through 2016. Overall rates of decline in Sarasota Bay bottlenose dolphins were like declines seen for Great Lakes fish and about twice the rate of decline observed in arctic temporal trend data sets. POP trends appear to have leveled off since 2009 in Sarasota Bay dolphins. For example, ΣPCBs in calves appear to have stabilized at 21 mg/kg lipid. Recent published work on delphinids with blubber concentrations spanning those observed in the present work suggest that levels of legacy POPs currently observed in Sarasota dolphins may suppress population growth. Results from this study confirm the need for continued monitoring of POPs in the Sarasota Bay bottlenose dolphin population to see if concentrations are continuing to fall or have indeed plateaued.

Population viability in data deficient nomadic species: What it will take to save regent honeyeaters from extinction

The long-distance, unpredictable movement patterns of nomadic species make them challenging to monitor and conserve. Critically endangered regent honeyeaters Anthochaera phrygia once roamed south-eastern Australia in ‘immense flocks’ but now number fewer than 300 wild birds over a vast 300,000 km2 range. Regent honeyeaters are a rare example where extensive monitoring data are now available for a nomadic species, enabling evaluation of the impact of management actions using population viability analysis (PVA). We combined demographic estimates from wild population monitoring in the 1990s, a zoo-based supplementation program and a contemporary range-wide monitoring program to simulate the wild population trajectory under various management and climatic scenarios. Without intervention, our models predicted extinction within 20 years, and showed that management strategies at their current intensity have limited efficacy to prevent extinction. Conservation actions should aim to increase the size and density of the wild population so that Allee effects no longer suppress population growth. Protection of wild regent honeyeater nests is essential as breeding success has declined over recent decades and droughts increasingly reduce breeding opportunities. Our models emphasise the need for zoo-based breeding to bolster the wild population, but show that release of zoo bred birds into the wild only slows the rate of population decline. To recover the wild regent honeyeater population, the next five years will be critical for implementing the most effective conservation strategy. This requires a combination of nest protection and release of zoo-bred birds with improved fitness, predator suppression, habitat protection and increased rates of habitat restoration.

Impact of Agriculture Factor and Non-Agriculture Factor to Value of Food Production: Cast Study of Vietnam, Thailand, Indonesia and Philippines Period 2010-2019

Food production provides an overview of developing a country's agriculture resilience and food security. Several factors can affect food production. They can be divided into agriculture factors and non-agriculture factors. This research aims to find agricultural and non-agricultural factors affecting food production. We assume the food production with a used average value of food production. A quantitative approach using a panel data model approach using for this research. The data used is secondary data. The results are that the factors that can affect food production with a used average value of food production are dependent variables. In this research, we used independent variables as follows agriculture land are, agriculture value-added, employment in the agriculture sector, credit to agriculture, and control variable. Control variables used in this research are annual population, gross domestic product, and political stability. This research is based on Vietnam, Thailand, Indonesia, and the Philippines. We used data panel regression for estimating the model, the data period used is in the period 2010-2019. This study provides recommendations that in increasing the optimization of food production, it is necessary to plan for value-added, empower workers, suppress population growth, and political stability.

Seed predation is key to preventing population growth of the weed Alopecurus myosuroides

Abstract Seed predation can reduce the abundance and spread of unwanted vegetation in agricultural and other semi‐natural ecosystems. However, knowledge of how variations in seed predation rates affect plant species population dynamics is needed for decision making and knowledge‐based ecosystem management. We developed a stage‐classified stochastic matrix population model for Alopecurus myosuroides Huds. (blackgrass), an annual plant species thriving as a weed in temperate agroecosystems of Western and Northern Europe. The model was parameterised using empirical demographic data from long‐term experiments in Swedish winter wheat fields, including information on post‐dispersal seed losses by vertebrate and invertebrate seed predators. For agroecosystems with highly effective weed control measures (e.g. chemical and mechanical weed control), model simulations showed that seed losses via seed predation need to reach at least 78% at peak seed shedding to suppress population growth of A. myosuroides. The field experiment showed that vertebrates were most important for seed predation in July, at peak seed shedding. In August, after crop harvest, invertebrates were responsible for almost all seed predation. The model indicated that weed seed predation was much more important for weed regulation when it occurred before crop harvest in July. Vertebrates most strongly reduced population growth of A. myosuroides, although both vertebrates and invertebrates were needed to prevent it entirely. Synthesis and applications. We showed that weed seed predation by vertebrate and invertebrate seed predators is key for reducing the population growth of winter annual weeds like A. myosuroides in intensively managed agroecosystems. Therefore, protection of weed seed predators is essential for making management of unwanted vegetation less dependent on chemical and mechanical measures.

Wife's Perception of Contraception Equipment

The high birth rate in Indonesia is still a major problem in the population. One of the programs to suppress population growth is through the family planning program. Perceptions of couples of childbearing age regarding family planning have a strong enough influence to determine the use of contraceptives by their wives. This study aims to explore how the wife's perception of contraception. The research method used is qualitative with in-depth interviews. Informants who will conduct in-depth interviews are 4 informants who are wives and currently using contraceptives. The results showed that the informants first found out information on the use of contraceptives, namely by health workers. Informants feel that family and self-support affect the use of contraceptives. Informants use contraceptives to control the population, limit birth rates, and regulating birth spacing, informants will feel different discomforts when using contraceptives. informants have the view that Islam does not prohibit the use of contraceptives. Based on this, we can say that the perception of wives in using contraceptives is influenced by several aspects of the information, family support as well as the perception of a wife against contraceptives cheap and tangka it is a benchmark for the wife in the use of contraception other than required by the state. To regulate the distance between pregnancies, the wife also believes in terms of health and religious beliefs that using contraceptives does not violate the norms and beliefs they currently hold.

Effect of maternal ammonia stress on population dynamics of the rotifer Brachionus calyciflorus offspring.

Maternal effects play important roles in phenotypic variations among individuals and are thus considered to regulate population performance in responses to environmental stress. High ammonia levels are known to suppress population growth of the rotifer Brachionus calyciflorus. However, it remains unclear whether maternal environmental ammonia stress influences the offspring phenotypic variation and, if so, how it affects the offspring population dynamics in the rotifer. The present work examined variations in life history, morphology, feeding and digestive activities of B. calyciflorus offspring affected by maternal ammonia stress and the effect of the above variations on offspring population dynamics. We observed increased fitness in the offspring population affected by the cumulative maternal effect. There was a trade-off between offspring (F1) survival and reproductive investment under maternal (F0) ammonia stress. Population growth of the offspring possibly increased via decreasing body size and posterolateral spine length while enhancing cellulase activity. Moreover, the absence of the posterolateral spine of the rotifer was a sensitive response to maternal ammonia stress. These findings underscore maternal environmental stress as an important source of phenotypic variations and highlight these multiple responses work together to affect population dynamics.