Ecological consequences of hidden pathology by larval digeneans in South American mollusks.

The study of digeneans and their association with mollusks commenced in Europe and South America during the mid-19th to early 20th centuries. Digenean infestation can severely degrade host tissue, leading to diminished energy resources and eventual host mortality. However, these parasites can also induce various non-lethal effects, including changes in growth rates, survival rates, and reproductive capabilities, alongside physiological and behavioral alterations. While numerous studies have explored the ecological effects of digeneans on hosts in Europe and North America, our understanding of these dynamics in South America, particularly in first intermediate hosts, remains limited. Therefore, this paper aims to provide an overview of ecological investigations into digenean-mollusk systems in South America, emphasizing the importance of robust sampling designs and statistical analyses to address key ecological inquiries. Although fascinating examples exist of parasitism influencing different hierarchical levels of digenean-mollusk systems, particularly at the individual, population, and community levels, documentation of their ecosystem-level impacts is comparatively sparse. As South American studies of digenean-mollusk systems from an ecological perspective are still in their early stages, there is immense potential for uncovering unique ecological patterns in this largely unexplored region, propelling us toward further developmental strides in the parasite ecology.

A new species of jewel beetle (Coleoptera, Buprestidae, Agrilus) triggers the production of the Brazilian red propolis.

Red propolis is a substance produced by bees by mixing resins from plants with wax, oils, and other secretions to protect the hive against natural enemies. Dalbergia ecastaphyllum (L.) Taub. (Fabaceae) is the primary botanical source of the Brazilian red propolis, where bees Apis mellifera L. collect a reddish resin from the stems to produce propolis. This species occurs in coastal dune and mangrove ecosystems, where local beekeepers install their beehives for propolis production. The induction of propolis production was virtually unknown. Previous reports and field evidence suggested that the reddish resin available in D. ecastaphyllum stems was not produced spontaneously but induced by the presence of a parasitic insect that feeds on the plant's stems. Research in the apiaries of the beekeepers' association of Canavieiras, Bahia, Brazil, led to the capture of a jewel beetle of an unknown species of the genus Agrilus Curtis (Buprestidae). It was confirmed that this jewel beetle is a red propolis production inductor. The adult and immature of this new species, Agrilus propolis Migliore, Curletti, and Casari sp. nov. are here described and illustrated. Behavioral information on the biology and chemical ecology confirms that the reddish resin of D. ecastaphyllum is directly related to the beetle attack and only occurs when Agrilus propolis sp. nov. adults emerge from the plant stem. This information is very important for Brazilian propolis producers interested in expanding red propolis production, which can have favorable effects on the economy of mangrove communities, promoting income generation, creating new business opportunities, and helping to sustain local communities and families.

Fungal Guttation, a Source of Bioactive Compounds, and Its Ecological Role-A Review.

Guttation is a common phenomenon in the fungal kingdom. Its occurrence and intensity depend largely on culture conditions, such as growth medium composition or incubation temperature. As filamentous fungi are a rich source of compounds, possessing various biological activities, guttation exudates could also contain bioactive substances. Among such molecules, researchers have already found numerous mycotoxins, antimicrobials, insecticides, bioherbicides, antiviral, and anticancer agents in exudate droplets. They belong to either secondary metabolites (SMs) or proteins and are secreted with different intensities. The background of guttation, in terms of its biological role, in vivo, and promoting factors, has been explored only partially. In this review, we describe the metabolites present in fungal exudates, their diversity, and bioactivities. Pointing to the significance of fungal ecology and natural products discovery, selected aspects of guttation in the fungi are discussed.

Talaromyces-Insect Relationships.

Facing the urgent need to reduce the input of agrochemicals, in recent years, the ecological relationships between plants and their associated microorganisms have been increasingly considered as an essential tool for improving crop production. New findings and data have been accumulated showing that the application of fungi can go beyond the specific role that has been traditionally assigned to the species, employed in integrated pest management as entomopathogens or mycoparasites, and that strains combining both aptitudes can be identified and possibly used as multipurpose biocontrol agents. Mainly considered for their antagonistic relationships with plant pathogenic fungi, species in the genus Talaromyces have been more and more widely reported as insect associates in investigations carried out in various agricultural and non-agricultural contexts. Out of a total of over 170 species currently accepted in this genus, so far, 27 have been found to have an association with insects from 9 orders, with an evident increasing trend. The nature of their mutualistic and antagonistic relationships with insects, and their ability to synthesize bioactive compounds possibly involved in the expression of the latter kind of interactions, are analyzed in this paper with reference to the ecological impact and applicative perspectives in crop protection.

Ecological relationships of Haemagogus spegazzinii (Diptera: Culicidae) in a semiarid area of Brazil

Abstract INTRODUCTION: Haemagogus are mosquitoes with diurnal habits that live preferentially in forest areas. In Brazil, they are considered the primary vectors of wild yellow fever. METHODS: The ecological relationships between Haemagogus spegazzinii, the environment, and some of its activities in the semiarid region of Rio Grande do Norte were analyzed by collecting eggs with ovitraps, actively searching in tree holes, capturing adults in Shannon traps, and conducting an investigation for viral infections. RESULTS: A total of 2420 eggs, 271 immature specimens (larvae and pupae), and 206 adults were collected. Egg collection depended on rainfall and relative humidity, with oviposition occurring between January and May. Larvae were found in five plant species, including Tabebuia aurea (craibeira), with 160 larvae collected. We observed shared breeding sites between Hg. spegazzinii and the following species: Aedes albopictus, Aedes terrens, Culex spp., and Toxorhynchites theobaldi. Adults exhibited greater activity between 5 pm and 6 pm, when 191 (92.7%) specimens were captured, while only 1 (0.5%) was collected between 7 pm and 8 pm. The relationship between Hg. spegazzinii and rainfall was significant, with positive correlations with accumulated rainfall 5, 10, 15, 20, and 30 days before mosquito collection. We found that the species was infected with the DENV-2 virus. CONCLUSIONS: This work contributes new information on the bioecology of Hg. spegazzinii, with data on the main reproduction periods, oviposition, breeding sites, activity times, and the relationship between the species and meteorological variables in the Caatinga of northeastern Brazil.

The Multilevel Relationships of HIV-Related Stigma to Child and Caregiver Mental Health among HIV-Affected Households in South Africa.

HIV/AIDS-related (HAR) stigma is still a prevalent problem in Sub-Saharan Africa, and has been found to be related to mental health of HIV-positive individuals. However, no studies in the Sub-Saharan African context have yet examined the relationship between HAR stigma and mental health among HIV-negative, HIV-affected adults and families; nor have any studies in this context yet examined stigma as an ecological construct predicting mental health outcomes through supra-individual (setting level) and individual levels of influence. Multilevel modeling was used to examine multilevel, ecological relationships between HAR stigma and mental health among child and caregiver pairs from a systematic, community-representative sample of 508 HIV-affected households nested within 24 communities in KwaZulu-Natal, South Africa. Two distinct dimensions of HAR stigma were measured: individual stigmatizing attitudes, and perceptions of community normative stigma. Findings suggest that individual-level HAR stigma significantly predicts individual mental health (depression and anxiety) among HIV-affected adults; and that community-level HAR stigma significantly predicts both individual-level mental health outcomes (anxiety) among HIV-affected adults, and mental health outcomes (PTSD and externalizing behavior scores) among HIV-affected children. Differentiated patterns of relationships were found using the two different stigma measures. These findings of unique relationships identified when utilizing two conceptually distinct stigma measures, at two levels of analysis (individual and community) suggest that HAR stigma in this context should be conceptualized as a multilevel, multidimensional construct. These findings have important implications both for mental health interventions and for interventions to reduce HAR stigma in this context.

Microbial anodic consortia fed with fermentable substrates in microbial electrolysis cells: Significance of microbial structures.

Microbial community structure of anodic biofilms plays a key role in bioelectrochemical systems (BESs). When ecosystems are used as inocula, many bacterial species having interconnected ecological interactions are present. The aim of the present study was to identify these interactions for the conversion of single substrates into electrical current. Dual-chamber reactors were inoculated with activated sludge and fed in batch mode with acetate, lactate, butyrate and propionate at 80 mMe- equivalents in quadruplicate. Analyses of biofilms and planktonic microbial communities showed that the anodic biofilms were mainly dominated by the Geobacter genus (62.4% of the total sequences). At the species level, Geobacter sulfurreducens was dominant in presence of lactate and acetate, while Geobacter toluenoxydans and Geobacter pelophilus were dominant with butyrate and propionate as substrates. These results indicate for the first time a specificity within the Geobacter genus towards the electron donor, suggesting a competitive process for electrode colonization and the implementations of syntrophic interactions for complete oxidation of substrates such as propionate and butyrate. All together, these results provide a new insight into the ecological relationships within electroactive biofilms and suggest eco-engineering perspectives to improve the performances of BESs.

Vegetation cover in relation to socioeconomic factors in a tropical city assessed from sub-meter resolution imagery.

Fine-scale information about urban vegetation and social-ecological relationships is crucial to inform both urban planning and ecological research, and high spatial resolution imagery is a valuable tool for assessing urban areas. However, urban ecology and remote sensing have largely focused on cities in temperate zones. Our goal was to characterize urban vegetation cover with sub-meter (<1 m) resolution aerial imagery, and identify social-ecological relationships of urban vegetation patterns in a tropical city, the San Juan Metropolitan Area, Puerto Rico. Our specific objectives were to (1) map vegetation cover using sub-meter spatial resolution (0.3-m) imagery, (2) quantify the amount of residential and non-residential vegetation, and (3) investigate the relationship between patterns of urban vegetation vs. socioeconomic and environmental factors. We found that 61% of the San Juan Metropolitan Area was green and that our combination of high spatial resolution imagery and object-based classification was highly successful for extracting vegetation cover in a moist tropical city (97% accuracy). In addition, simple spatial pattern analysis allowed us to separate residential from non-residential vegetation with 76% accuracy, and patterns of residential and non-residential vegetation varied greatly across the city. Both socioeconomic (e.g., population density, building age, detached homes) and environmental variables (e.g., topography) were important in explaining variations in vegetation cover in our spatial regression models. However, important socioeconomic drivers found in cities in temperate zones, such as income and home value, were not important in San Juan. Climatic and cultural differences between tropical and temperate cities may result in different social-ecological relationships. Our study provides novel information for local land use planners, highlights the value of high spatial resolution remote sensing data to advance ecological research and urban planning in tropical cities, and emphasizes the need for more studies in tropical cities.

Spatial variation in the ecological relationships among the components of Beijing's carbon metabolic system.

In this paper, we construct a spatially explicit model of carbon metabolism for the flows of carbon among the components of an urban area. We used the model to identify spatial heterogeneity in the ecological relationships within a carbon metabolic network. We combined land-use and cover type maps for Beijing from 1990 to 2010 with empirical coefficients and socioeconomic data to quantify the flows. We used utility analysis to determine the ecological relationships between the components of the system and analyzed their changes during urban development. We used ArcGIS to analyze their spatial variation. We found that the positive utilities in Beijing decreased over time and that negative relationships mostly outweighed positive relationships after 2000. The main ecological relationships were distributed throughout the entire urban area before 2000; subsequently, exploitation, control, and mutualism relationships became concentrated in the southeast, leaving competition relationships to dominate the northwest. Mutualism relationships were most common for natural components, but were not stable because they were easily disturbed by urban expansion. Transportation and industrial land and urban land were the most important contributors to exploitation and control relationships and may be important indicators of spatial adjustment. Increasing competition relationships unbalanced the carbon metabolism, and limitations on the area of land available for development and on the water resources led to increasingly serious competition. The results provide an objective basis for planning adjustments to Beijing's land-use patterns to improve its carbon metabolism and reduce carbon emission.

Improving the construction of functional models of alternative persistent states in coral reefs using insights from ongoing research programs: a discussion paper.

Extensive degradation of coral reefs makes it imperative to create functional models that demonstrate ecological processes which occur in alternative states that persist over time. These models provide important information that can help in decision making regarding management measures for both the prevention of further degradation and the recovery of these ecosystems. Development of these models requires identifying and testing the ecological processes that will impose the reduction of coral cover and, preferably, identifying the disturbance that triggers this phenomenon. For this reason, research programs are a useful tool which allows a focus on the production of information for modeling. It should start with survey investigations and tests of hypotheses concerning the cause of the reduction of coral cover. Subsequently, projects should be guided by the most probable hypotheses, focusing on one guild or functional group at a time until the "trigger" process which unleashed the disturbance is identified. Even if incomplete, these models already provide information for focusing management steps.

Inductive reasoning and forecasting of population dynamics of Cylindrospermopsis raciborskii in three sub-tropical reservoirs by evolutionary computation.

Seven-day-ahead forecasting models of Cylindrospermopsis raciborskii in three warm-monomictic and mesotrophic reservoirs in south-east Queensland have been developed by means of water quality data from 1999 to 2010 and the hybrid evolutionary algorithm HEA. Resulting models using all measured variables as inputs as well as models using electronically measurable variables only as inputs forecasted accurately timing of overgrowth of C. raciborskii and matched well high and low magnitudes of observed bloom events with 0.45≤r2>0.61 and 0.4≤r2>0.57, respectively. The models also revealed relationships and thresholds triggering bloom events that provide valuable information on synergism between water quality conditions and population dynamics of C. raciborskii. Best performing models based on using all measured variables as inputs indicated electrical conductivity (EC) within the range of 206-280mSm-1 as threshold above which fast growth and high abundances of C. raciborskii have been observed for the three lakes. Best models based on electronically measurable variables for the Lakes Wivenhoe and Somerset indicated a water temperature (WT) range of 25.5-32.7°C within which fast growth and high abundances of C. raciborskii can be expected. By contrast the model for Lake Samsonvale highlighted a turbidity (TURB) level of 4.8 NTU as indicator for mass developments of C. raciborskii. Experiments with online measured water quality data of the Lake Wivenhoe from 2007 to 2010 resulted in predictive models with 0.61≤r2>0.65 whereby again similar levels of EC and WT have been discovered as thresholds for outgrowth of C. raciborskii. The highest validity of r2=0.75 for an in situ data-based model has been achieved after considering time lags for EC by 7 days and dissolved oxygen by 1 day. These time lags have been discovered by a systematic screening of all possible combinations of time lags between 0 and 10 days for all electronically measurable variables. The so-developed model performs seven-day-ahead forecasts and is currently implemented and tested for early warning of C. raciborskii blooms in the Wivenhoe reservoir.

Two fundamental ecological relationships that deepen the sense of social, economical and ethical values of mental representations

Over the definition of any possible ecological relationships concerning life-quality competition, survival and transformation standards (concerning animal, human and social life forms) still two basic ecological relationships providing new insights to old problems of Biology, Sociology, Ethics, and Economy can be enhanced. They are ferocity /depredation versus angelically / protection as opposite basic ecological relationships. One main key rests on the correspondence that these relationships keep with the emergence of opposed crucial values like tangible values versus intangible values. These two categories also concern with the ecological, social and cultural further meanings of ethical moods implied by the two ecological relationships above. So, the sense of tangible (material) values over intangible (immaterial) values coheres with the sense of the ferocity /depredation relationship and their adversarial attitudes, while the evolutionary emergence of the angelically / protection relationship and its corresponding harboring attitudes are especially explained in such way that this relationship generates the effective prevalence of intangible / immaterial values over tangible / material ones when both kind of values get into conflict because of opposed life purposes. From these concepts (both on values and ecological relationships) all further social relationship, attitude, mental attribution or representation can be explained as a significant values mix, intercalation or partial balance between the two basic ecological relationships. These appreciations can render new values meanings and ethical categorizations to social and economical relationships. However, they must be interchangeable in terms of attitude mix and unbalance: A same living-agent may act predomi- nantly one ecological-relationship and then change to the other. The eagle acts ecologically harshly by the ferocity / depredation relationship when chasing the rabbit, while immediately shifts ecologically to the angelically / protection relationship when kindly disgorging flesh into its chicks'bills. Any living organism may in any moment adopt one ecological relationship instead the other conveying the implications of the two kinds of values tangible and intangible that they make prevail showing the ethical sense of its meaning. Therefore, these two ecological relationships must not be taken as excluding concept-categories, but as highlighting relationships from an infinite number of ecological relationships. So, according to life changing circumstances one or another ecological relationship takes one corresponding prevalent value. These two ecological relationships are compared apart because each represents a highly different biological meaning and man ethical status implying a great qualitative jump in life evolution and living conditions. What matters is the progressively tendency of angelically /protection and prevalent intangible values to restrain and attenuate the natural original harshness of ferocity / depredation relationship. According to this progression, a hierarchical approach is adopted in connection to higher and lower values as suggested by philosopher Max Scheler. According to him, the fulfillment of the vertical hierarchy implied by values is a sufficient issue to determine the values ethical sense. Whether the values-verticality is or is not transgressed by social life decisions and applications goes related to ferocity / depredation and angelically / protection sequential options; each representing the extreme values in the hierarchical scale: ferocity / depredation more affine to the lowest values (material - tangible values), while angelically / protection more to the prevalence of the highest ones (immaterial - intangible values). Material values are the natural values usually demanded to satisfy biological, physiological, physical and special pleasure needs. On the contrary, immaterial values are intangible spiritual values, such freedom, confidence, friendship, care, love, responsibility, promised-word, word-accomplishment, person-respect, health, Human Rights and the proper people-lives. These are values flying up the highest human, cultural, social panorama over the lower and commonplace appetites of most vulgar individuals. All this treatment is based on firmly keeping the spiritual values such as ethics, culture ,love, care, freedom, respect, education, human life and Human Rights ever at the top of all value hierarchy. Values are not seen as closed systems but as open and unlimitedly creative whether tangible or intangible ones. The more the intangible values the higher the social and cultural advancement.

A partir de dos relaciones ecológicas básicas, ferocidad / depredación y angelicalidad / protección, se ensayan diferentes progresiones biológico-sociales y culturales. La primera relación está directamente referida a las figuras presa y depredador en cadenas tróficas y ecosistemas de competitividad y convivencia. La segunda magnifica el valor y significado del cuidado y supervivencia del recién nacido. Se revisa el origen evolutivo, ecológico y etológico de ambas relaciones como balance conductual entre situaciones extremas de cada individuo y especie, abriendo un nuevo insight sobre viejos problemas de la Biología, la Sociología, la Etica y la Economía. La clave es lo que relaciona a estas dos relaciones con valores materiales tangibles y valores in materiales intangibles, respectivamente. Resulta directo asociar la primera relación con la satisfacción inmediata de necesidades básicas, juzgadas como materiales y tangibles. En contraste, la segunda relación viene como un complemento que genera nuevos significados y riqueza de sentidos ecológico-etológicos de toda forma de vida. Los valores se estiman como un sistema abierto y creciente. A más valores intangibles, mayor es el avance en representaciones significantes.