Family systems approaches in pediatric obesity management: a scoping review.

Family-based obesity management interventions targeting child, adolescent and parental lifestyle behaviour modifications have shown promising results. Further intervening on the family system may lead to greater improvements in obesity management outcomes due to the broader focus on family patterns and dynamics that shape behaviours and health. This review aimed to summarize the scope of pediatric obesity management interventions informed by family systems theory (FST). Medline, Embase, CINAHL and PsycInfo were searched for articles where FST was used to inform pediatric obesity management interventions published from January 1980 to October 2023. After removal of duplicates, 6053 records were screened to determine eligibility. Data were extracted from 50 articles which met inclusion criteria; these described 27 unique FST-informed interventions. Most interventions targeted adolescents (44%), were delivered in outpatient hospital settings (37%), and were delivered in person (81%) using group session modalities (44%). Professionals most often involved were dieticians and nutritionists (48%). We identified 11 FST-related concepts that guided intervention components, including parenting skills, family communication, and social/family support. Among included studies, 33 reported intervention effects on at least one outcome, including body mass index (BMI) (n = 24), lifestyle behaviours (physical activity, diet, and sedentary behaviours) (n = 18), mental health (n = 12), FST-related outcomes (n = 10), and other outcomes (e.g., adiposity, cardiometabolic health) (n = 18). BMI generally improved following interventions, however studies relied on a variety of comparison groups to evaluate intervention effects. This scoping review synthesises the characteristics and breadth of existing FST-informed pediatric obesity management interventions and provides considerations for future practice and research.

An evaluation of the suitability, readability, quality, and usefulness of online resources for patients with cancer receiving immunotherapy.

OBJECTIVE: To evaluate the suitability, readability, quality, and usefulness of available online resources about the side effects of immunotherapy. METHODS: Resources were identified through online searches (Google, Microsoft Bing, and Yahoo search engines) and evaluated using the Suitability Assessment Materials (SAM), three readability formulae, the DISCERN tool (quality), and a checklist of symptom management strategies and self-management skills (usefulness). Hierarchical cluster analysis identified resources scoring highly for suitability and quality. Factors associated with the clusters were identified using Fischer's exact tests. RESULTS: The 51 resources retained for evaluation were of low suitability and quality and exceeded recommended reading levels. Resources were lacking key features to support learning (e.g., illustrations) as well as information about the risks of treatments and the effect of treatments on quality of life. Few resources addressed key self-management skills of problem-solving and taking action. The cluster analysis identified "low" and "moderate" clusters for suitability and quality, and pamphlets and booklets were more likely to be in the moderate cluster as compared to webpages. CONCLUSION: There is a lack of high-quality resources to support patients' learning to self-manage side effects of immunotherapy. PRACTICE IMPLICATIONS: Results identify the best available online resources for self-managing side effects of immunotherapy and gaps for future work. Based on findings, a template for patient education materials was developed.

Evaluation of quality, readability, suitability, and usefulness of online resources available to cancer survivors.

PURPOSE: The aim of this study was to evaluate the quality, readability, suitability, and usefulness of resources publicly available to adult cancer survivors (aged 18 +) who have completed primary treatment. METHODS: Resources were identified in July 2021 through Google. Search completeness was verified using Yahoo, Bing, and MedlinePlus. Retrieved resources were assessed for quality using the DISCERN, readability, suitability using the Suitability Assessment Measure (SAM), and usefulness based on a list of unmet needs and self-management skills derived from the literature. Descriptive analyses were conducted, and a cluster analysis identified the highest-scoring resources. RESULTS: Forty-five resources were included. The mean DISCERN score was fair at 63.3% (SD 13.7%) with low-rated items being sources, publication date, and risks and mechanisms of treatment. The mean reading grade level was 11.19 (SD 1.61, range 8-16) with only one resource scoring an 8. The mean SAM score was in the adequate range at 48.2% (SD 10.6%), with graphics being the lowest-rated section. On average, included resources addressed 57.7% (SD 27.3%) of the unmet needs and 48.4% (SD 20.9%) of the self-management skills, the least addressed being problem-solving. CONCLUSION: Quality and suitability were fair, whereas readability exceeded recommended levels. Only one resource had a superior score in both quality and suitability. IMPLICATIONS FOR CANCER SURVIVORS: The most pressing need is to develop resources for cancer survivors that address their unmet needs and are accessible in terms of literacy. Study findings outline the highest-scoring resources currently available to survivors, families, and clinicians.

Evaluation of online, publicly available cancer-related educational and self-management resources for symptom management.

OBJECTIVE: The aims of this study were to evaluate the readability, suitability, and quality of publicly available online self-management (SM) resources for people with cancer. METHODS: Resources were identified using two strategies: (1) a targeted search of 20 Canadian organizations and (2) a Google search. These were evaluated using the Suitability Assessment of Materials (SAM), the DISCERN tool for quality, and readability indices. The SM skills (e.g., problem-solving) and symptom management strategies addressed by each resource were also assessed. Descriptive and hierarchical cluster analyses were performed to identify resources of the highest suitability and quality as well as resource characteristics associated with higher quality and suitability. RESULTS: A total of 92 resources were evaluated. The mean reading grade level for English resources was 10.29 (SD = 1.64, range of 7.05 to 15.09) and 12.62 for French resources (SD = 2.27, range of 10.12 to 15.65). The mean SAM score across the sample was 50.4% (SD = 10.6%), or 'adequate', and the mean DISCERN score was 61.1% (SD = 11.8%), or 'fair'. The cluster analysis indicated that 10 resources scored highly on both the SAM and the DISCERN. In total, 91 symptom management strategies were identified. On average, resources addressed 2.73 SM skills (SD = 1.58). CONCLUSIONS: There is a need for plain language resources for people with lower reading ability and resources that incorporate more SM skills. Study findings will help healthcare professionals, patients, and their families identify optimal resources to address cancer-related symptoms.

Factors influencing the implementation of mental health recovery into services: a systematic mixed studies review.

BACKGROUND: Countries around the world have committed in policy to transforming their mental health services towards a recovery orientation. How has mental health recovery been implemented into services for adults, and what factors influence the implementation of recovery-oriented services? METHODS: This systematic mixed studies review followed a convergent qualitative synthesis design and used the best-fit framework synthesis method. Librarians ran searches in Ovid- MEDLINE, Ovid-EMBASE, Ovid-PsycInfo, EBSCO-CINAHL Plus with Full Text, ProQuest Dissertations and Theses, Cochrane Library, and Scopus. Two reviewers independently screened studies for inclusion or exclusion using DistillerSR. Qualitative, quantitative, and mixed methods peer-reviewed studies published since 1998 were included if they reported a new effort to transform adult mental health services towards a recovery orientation, and reported findings related to implementation experience, process, or factors. Data was extracted in NVivo12 to the 38 constructs of the Consolidated Framework for Implementation Research (CFIR). The synthesis included a within-case and a cross-case thematic analysis of data coded to each CFIR construct. Cases were types of recovery-oriented innovations. RESULTS: Seventy studies met our inclusion criteria. These were grouped into seven types of recovery-oriented innovations (cases) for within-case and cross-case synthesis. Themes illustrating common implementation factors across innovations are presented by CFIR domain: Intervention Characteristics (flexibility, relationship building, lived experience); Inner Setting (traditional biomedical vs. recovery-oriented approach, the importance of organizational and policy commitment to recovery-transformation, staff turnover, lack of resources to support personal recovery goals, information gaps about new roles and procedures, interpersonal relationships), Characteristics of Individuals (variability in knowledge about recovery, characteristics of recovery-oriented service providers); Process (the importance of planning, early and continuous engagement with stakeholders). Very little data from included studies was extracted to the outer setting domain, and therefore, we present only some initial observations and note that further research on outer setting implementation factors is needed. CONCLUSION: The CFIR required some adaptation for use as an implementation framework in this review. The common implementation factors presented are an important starting point for stakeholders to consider when implementing recovery-oriented services.

Fear of Cancer Recurrence, Health Anxiety, Worry, and Uncertainty: A Scoping Review About Their Conceptualization and Measurement Within Breast Cancer Survivorship Research.

Objective: Fear of Cancer Recurrence (FCR), Health Anxiety (HA), worry, and uncertainty in illness are psychological concerns commonly faced by cancer patients. In survivorship research, these similar, yet different constructs are frequently used interchangeably and multiple instruments are used in to measure them. The lack of clear and consistent conceptualization and measurement can lead to diverse or contradictory interpretations. The purpose of this scoping review was to review, compare, and analyze the current conceptualization and measurements used for FCR, HA, worry, and uncertainty in the breast cancer survivorship literature to improve research and practice. Inclusion Criteria: We considered quantitative, qualitative, and mixed methods studies of breast cancer survivors that examined FCR, HA, worry, or uncertainty in illness as a main topic and included a definition or assessment of the constructs. Methods and Analysis: The six-staged framework was used to guide the scoping review process. Searches of PubMed, CINAHL, and PsycINFO databases were conducted. The principle-based qualitative analysis and simultaneous content analysis procedures were employed to synthesize and map the findings. Findings: After duplicate removal, the search revealed 3,299 articles, of which 82 studies met the inclusion criteria. Several critical attributes overlapped the four constructs, for example, all were triggered by internal somatic and external cues. However, several unique attributes were found (e.g., a sense of loss of security in the body is observed only among survivors experiencing FCR). Overall, findings showed that FCR and uncertainty in illness are more likely to be triggered by cancer-specific factors, while worry and HA have more trait-like in terms of characteristics, theoretical features, and correlates. We found that the measures used to assess each construct were on par with their intended constructs. Eighteen approaches were used to measure FCR, 15 for HA, 8 for worry, and 4 for uncertainty. Conclusion: While consensus on the conceptualization and measurement of the four constructs has not yet been reached, this scoping review identifies key similarities and differences to aid in their selection and measurement. Considering the observed overlap between the four studied constructs, further research delineating the unique attributes for each construct is warranted.

Levothyroxine and the risk of adverse pregnancy outcomes in women with subclinical hypothyroidism: a systematic review and meta-analysis.

BACKGROUND: Levothyroxine replacement therapy may decrease the risk of adverse pregnancy outcomes among women with subclinical hypothyroidism (SCH). The aim of this study is to conduct a systematic review and meta-analysis to examine the risk of adverse pregnancy, perinatal, and early childhood outcomes among women with SCH treated with levothyroxine. METHODS: A systematic literature search was conducted using Ovid-Medline, Ovid-EMBASE, Pubmed (non-Medline), Ebsco-CINAHL Plus with full text and Cochrane Library databases. Randomized controlled studies (RCTs) and observational studies examining the association between treatment of SCH during pregnancy and our outcomes of interest were included. Studies that compared levothyroxine treatment versus no treatment were eligible for inclusion. Data from included studies were extracted and quality assessment was performed by two independent reviewers. RESULTS: Seven RCTs and six observational studies met our inclusion criteria. A total of 7342 individuals were included in these studies. RCTs demonstrated several sources of bias, with lack of blinding of the participants or research personnel; only one study was fully blinded. In the observational studies, there was moderate to serious risk of bias due to lack of adjustment for certain confounding variables, participant selection, and selective reporting of results. Pooled analyses showed decreased risk of pregnancy loss (RR: 0.79; 95% CI: 0.67 to 0.93) and neonatal death (RR: 0.35; 95% CI: 0.17 to 0.72) associated with levothyroxine treatment during pregnancy among women with SCH. There were no associations between levothyroxine treatment and outcomes during labour and delivery, or cognitive status in children at 3 or 5 years of age. CONCLUSION: Treatment of SCH with levothyroxine during pregnancy is associated with decreased risks of pregnancy loss and neonatal death. Given the paucity of available data and heterogeneity of included studies, additional studies are needed to address the benefits of levothyroxine use among pregnant women with SCH.

CHLA Standards for Library and Information Services in Canadian Health & Social Services Institutions 2020.

The following standards, with supporting evidence, are intended to serve as a guide to structuring minimum library services within health and social services institutions across all Canadian provinces and territories. The Standards are not intended to be aspirational. The aim of the Task Force was to ensure that the Standards update would not be so removed from the current realities and landscape that they became unattainable to many libraries. For this reason, some Standards outline requirements that are essential to the minimum function of the library, and other Standards provide recommendations only. The intended use of the Standards is to set a baseline for the provision of essential library services and resources and aid in advocating for adequate resources. It is important to note, however, that the Task Force does not intend for the Standards to prevent libraries from reaching a more advanced level of service, and we hope that in their current form they will not be a hindrance to excellence or innovation. Once published, the version of the Standards made freely available on the Canada Health Libraries Association website [1] shall henceforth and always be considered the most recent and active version of the Standards and is the version that should be used to inform practice. The Standards Standing Committee will institute a regular review and updating schedule, ensuring the currency of the Standards.

Nurses' knowledge on routine care and maintenance of adult vascular access devices: A scoping review.

BACKGROUND: Vascular access devices (VAD), centrally (CVAD) or peripherally (PIV) located, are common in the nursing profession. A high proportion of admitted patients require a VAD to enable administration of intravenous treatments or diagnostic modalities. As the primary caregivers for these patients, nurses are responsible for ongoing care and maintenance of these devices. OBJECTIVE: This scoping review examines the current state of practicing nurses knowledge around routine care and maintenance of adult VADs. METHODS: In the fall of 2018, the following databases were searched: Medline-Ovid 1946 to current, Embase-Ovid 1947 to current, Ebsco CINAHL Plus with full text and ProQuest Nursing & Allied Health database, and articles were selected according to the PRISMA-ScR checklist. INCLUSION CRITERIA: original research published in peer-reviewed journals; in English or French; and focused on practising nurses' knowledge about the routine care and maintenance of adult VADs. RESULTS: Of the 4,099 abstracts identified, 36 full-text articles were included. Study characteristics are reportedin addition to themes found in the literature: the relationship between demographic data and CVAD/PIV knowledge, the state of nurses' CVAD/PIV knowledge and nurses' CVAD/PIV knowledge scores. Overall, significant gaps in nurses' knowledge on the care and maintenance of VADs are noted. CONCLUSION: The variability in nurses' knowledge around both CVAD and PIV led the authors to conclude that there is room for improvement in the educational preparation of nurses and a need for workplace training. RELEVANCE TO CLINICAL PRACTICE: This scoping review intends to highlight the knowledge gap of nurses with regard to best practices for VAD routine care and maintenance and demonstrate the need for education, both in educational and healthcare institutions, to ensure high-quality care and improved patient outcomes.

Health outcomes of online consumer health information: A systematic mixed studies review with framework synthesis.

The Internet has become the first source of consumer health information. Most theoretical and empirical studies are centered on information needs and seeking, rather than on information outcomes. This review's purpose is to explore and explain health outcomes of Online Consumer Health Information (OCHI) in primary care. A participatory systematic mixed studies review with a framework synthesis was undertaken. Starting from an initial conceptual framework, our specific objectives were to (a) identify types of OCHI outcomes in primary care, (b) identify factors associated with these outcomes, and (c) integrate these factors and outcomes into a comprehensive revised framework combining an information theory and a psychosocial theory of behavior. The results of 65 included studies were synthesized using a qualitative thematic data analysis. The themes derived from the literature underwent a harmonization process that produced a comprehensive typology of OCHI outcomes. The revised conceptual framework specifies four individual and one organizational level of OCHI outcomes, while including factors such as consumers' information needs and four interdependent contextual factors. It contributes to theoretical knowledge about OCHI health outcomes, and informs future research, information assessment methods, and tools to help consumers find and use health information.

Impact of unit design on intensive care unit clinicians: a scoping review protocol.

OBJECTIVE: This scoping review aims to identify the known impact of unit design on intensive care unit clinicians, and more specifically, to explore similarities and differences across critical care settings. INTRODUCTION: Construction and infrastructure renewal represent great opportunities for designing units that enhance patient care, as well as support the work of clinicians. A growing body of evidence is showing how unit design can impact clinical staff, but no reviews have been found that focus exclusively on clinicians within intensive care units. INCLUSION CRITERIA: The review will consider studies that include healthcare staff who offer direct patient care in adult or pediatric intensive care units. Studies that focus on the impact of design (related to physical environment features) on clinicians will be included. METHODS: The proposed systematic review will be conducted in accordance with JBI methodology for scoping reviews. The search strategy aims to find published and unpublished studies. The databases to be searched will include Embase MEDLINE, PsycINFO, Healthstar and CINAHL. Retrieved studies will be assessed against the inclusion criteria by two independent reviewers. For the papers included in the scoping review, data will be extracted and quality assessed by two independent reviewers. The extracted data will be presented in tabular form, and a narrative summary will describe how the results relate to the review objective.

Mating Status of an Herbivorous Stink Bug Female Affects the Emission of Oviposition-Induced Plant Volatiles Exploited by an Egg Parasitoid.

Insect parasitoids are under selection pressure to optimize their host location strategy in order to maximize fitness. In parasitoid species that develop on host eggs, one of these strategies consists in the exploitation of oviposition-induced plant volatiles (OIPVs), specific blends of volatile organic compounds released by plants in response to egg deposition by herbivorous insects. Plants can recognize insect oviposition via elicitors that trigger OIPVs, but very few elicitors have been characterized so far. In particular, the source and the nature of the elicitor responsible of egg parasitoid recruitment in the case of plants induced with oviposition by stink bugs are still unknown. In this paper, we conducted behavioral and molecular investigations to localize the source of the elicitor that attracts egg parasitoids and elucidate the role of host mating in elicitation of plant responses. We used as organism study model a tritrophic system consisting of the egg parasitoid Trissolcus basalis, the stink bug host Nezara viridula and the plant Vicia faba. We found that egg parasitoid attraction to plant volatiles is triggered by extracts coming from the dilated portion of the stink bug spermathecal complex. However, attraction only occurs if extracts are obtained from mated females but not from virgin ones. Egg parasitoid attraction was not observed when extracts coming from the accessory glands (mesadene and ectadene) of male hosts were applied, either alone or in combination to plants. SDS-PAGE electrophoresis correlated with olfactometer observations as the protein profile of the dilated portion of the spermathecal complex was affected by the stink bug mating status suggesting post-copulatory physiological changes in this reproductive structure. This study contributed to better understanding the host location process by egg parasitoids and laid the basis for the chemical characterization of the elicitor responsible for OIPV emission.

Infestation of Broad Bean (Vicia faba) by the Green Stink Bug (Nezara viridula) Decreases Shoot Abscisic Acid Contents under Well-Watered and Drought Conditions.

The response of broad bean (Vicia faba) plants to water stress alone and in combination with green stink bug (Nezara viridula) infestation was investigated through measurement of: (1) leaf gas exchange; (2) plant hormone titres of abscisic acid (ABA) and its metabolites, and of salicylic acid (SA); and (3) hydrogen peroxide (H2O2) content. Furthermore, we evaluated the effects of experimentally water-stressed broad-bean plants on N. viridula performance in terms of adult host-plant preference, and nymph growth and survival. Water stress significantly reduced both photosynthesis (A) and stomatal conductance (gs ), while infestation by the green stink bug had no effects on photosynthesis but significantly altered partitioning of ABA between roots and shoots. Leaf ABA was decreased and root ABA increased as a result of herbivore attack, under both well-watered and water-deprived conditions. Water stress significantly impacted on SA content in leaves, but not on H2O2. However, infestation of N. viridula greatly increased both SA and H2O2 contents in leaves and roots, which suggests that endogenous SA and H2O2 have roles in plant responses to herbivore infestation. No significant differences were seen for green stink bug choice between well-watered and water-stressed plants. However, for green stink bug nymphs, plant water stress promoted significantly lower weight increases and significantly higher mortality, which indicates that highly water-stressed host plants are less suitable for N. viridula infestation. In conclusion two important findings emerged: (i) association of water stress with herbivore infestation largely changes plant response in terms of phytohormone contents; but (ii) water stress does not affect the preference of the infesting insects, although their performance was impaired.

Foraging behaviour of an egg parasitoid exploiting plant volatiles induced by pentatomids: the role of adaxial and abaxial leaf surfaces.

Several phases of herbivorous insect attack including feeding and oviposition are known to induce plant defenses. Plants emit volatiles induced by herbivores to recruit insect parasitoids as an indirect defense strategy. So far, volatiles induced by herbivore walking and their putative role in the foraging behavior of egg parasitoids have not been investigated. In this paper we studied the response of the egg parasitoid Trissolcus basalis toward volatiles emitted by Vicia faba plants as consequence of the walking activity of the host Nezara viridula. Olfactometer bioassays were carried out to evaluate wasp responses to plants in which the abaxial or the adaxial surfaces were subjected to walking or/and oviposition. Results showed that host female walking on the abaxial but not on the adaxial surface caused a repellence effect in T. basalis 24 h after plant treatment. The emission of active volatiles also occurred when the leaf was turned upside-down, indicating a specificity of stress localization. This specificity was supported by the results, which showed that oviposition combined with feeding elicit the induction of plant volatiles, attracting the parasitoid, when the attack occurred on the abaxial surface. Analyses of plant volatile blends showed significant differences between the treatments.

Antennal responses to volatile organic compounds in a stonefly.

Notwithstanding their long antennae, especially in the adult stage, Plecoptera represent a poorly studied group as regards their sensory structures and their ability to perceive olfactory stimuli is so far totally unknown. A recent investigation on the antenna of Dinocras cephalotes revealed two kinds of putative olfactory sensilla (multiporous single walled sensilla and digitated double walled sensilla). The present electrophysiological study (electroantennography, EAG), in which male and female antennae of D. cephalotes (Plecoptera, Perlidae) have been stimulated with a set of generic odours belonging to different functional groups, shows that Plecoptera can perceive olfactory cues through their antennal sensilla. Indeed, although many chemicals did not elicit any response, high EAG activity has been recorded in response to pentanoic acid, propanal, butyric acid, propionic acid, isoamylamine and ammonia. The response was very similar in both sexes even if propanal elicited a response only in males. EAG dose-responses curves in both males and females showed that EAG responses were similar in males and females and generally increased in amplitude with increasing doses of the chemicals. Behavioural, neuroanatomical and molecular investigations on Plecoptera olfaction, could be particularly interesting not only to increase the knowledge of the adult stonefly behaviour but also to better understand the adaptation of the olfactory sensory system in aquatic insects moving from land to water.

Volatile cues can drive the oviposition behavior in Odonata.

Selection for the oviposition site represents the criterion for the behavioral process of habitat selection for the next generation. It is well known that in Odonata the most general cues are detected visually, but laboratory investigations on the coenagrionid Ischnura elegans showed through behavioral and electrophysiological assays that adults were attracted by olfactory cues emitted by prey and that males of the same species are attracted by female odor. The results of the present behavioral and electrophysiological investigations on I. elegans suggest the involvement of antennal olfactory sensilla in oviposition behavior. In particular, I. elegans females laid in the laboratory significantly more eggs in water from larval rearing aquaria than in distilled or tap water. Moreover, the lack of preference between rearing water and tap water with plankton suggests a role of volatiles related to conspecific and plankton presence in the oviposition site choice. I. elegans may rely on food odor for oviposition site selection, thus supporting the predictions of the "mother knows best" theory. These behavioral data are partially supported by electroantennographic responses. These findings confirm a possible role of olfaction in crucial aspects of Odonata biology.

The response of an egg parasitoid to substrate-borne semiochemicals is affected by previous experience.

Animals can adjust their behaviour according to previous experience gained during foraging. In parasitoids, experience plays a key role in host location, a hierarchical process in which air-borne and substrate-borne semiochemicals are used to find hosts. In nature, chemical traces deposited by herbivore hosts when walking on the plant are adsorbed by leaf surfaces and perceived as substrate-borne semiochemicals by parasitoids. Chemical traces left on cabbage leaves by adults of the harlequin bug (Murgantia histrionica) induce an innate arrestment response in the egg parasitoid Trissolcus brochymenae characterized by an intense searching behaviour on host-contaminated areas. Here we investigated whether the T. brochymenae response to host walking traces left on leaf surfaces is affected by previous experience in the context of parasitoid foraging behaviour. We found that: 1) an unrewarded experience (successive encounters with host-contaminated areas without successful oviposition) decreased the intensity of the parasitoid response; 2) a rewarded experience (successful oviposition) acted as a reinforcing stimulus; 3) the elapsed time between two consecutive unrewarded events affected the parasitoid response in a host-gender specific manner. The ecological role of these results to the host location process of egg parasitoids is discussed.

Carbon dioxide detection in adult Odonata.

The present paper shows, by means of single-cell recordings, responses of antennal sensory neurons of the damselfly Ischnura elegans when stimulated by air streams at different CO2 concentrations. Unlike most insects, but similarly to termites, centipedes and ticks, Odonata possess sensory neurons strongly inhibited by CO2, with the magnitude of the off-response depending upon the CO2 concentration. The Odonata antennal sensory neurons responding to CO2 are also sensitive to airborne odors; in particular, the impulse frequency is increased by isoamylamine and decreased by heptanoic and pentanoic acid. Further behavioral investigations are necessary to assign a biological role to carbon dioxide detection in Odonata.

Scent of a Dragonfly: Sex Recognition in a Polymorphic Coenagrionid.

In polymorphic damselflies discrimination of females from males is complex owing to the presence of androchrome and gynochrome females. To date there is no evidence that damselflies use sensory modalities other than vision (and tactile stimuli) in mate searching and sex recognition. The results of the present behavioural and electrophysiological investigations on Ischnura elegans, a polymorphic damselfly, support our hypothesis that chemical cues could be involved in Odonata sex recognition. The bioassays demonstrate that males in laboratory prefer female to male odour, while no significant difference was present in male behavior between stimuli from males and control. The bioassays suggest also some ability of males to distinguish between the two female morphs using chemical stimuli. The ability of male antennae to perceive odours from females has been confirmed by electrophysiological recordings. These findings are important not only to get insight into the chemical ecology of Odonata, and to shed light into the problem of olfaction in Paleoptera, but could be useful to clarify the controversial aspects of the mating behavior of polymorphic coenagrionids. Behavioural studies in the field are necessary to investigate further these aspects.

Egg parasitoid attraction toward induced plant volatiles is disrupted by a non-host herbivore attacking above or belowground plant organs.

Plants respond to insect oviposition by emission of oviposition-induced plant volatiles (OIPVs) which can recruit egg parasitoids of the attacking herbivore. To date, studies demonstrating egg parasitoid attraction to OIPVs have been carried out in tritrophic systems consisting of one species each of plant, herbivore host, and the associated egg parasitoid. Less attention has been given to plants experiencing multiple attacks by host and non-host herbivores that potentially could interfere with the recruitment of egg parasitoids as a result of modifications to the OIPV blend. Egg parasitoid attraction could also be influenced by the temporal dynamics of multiple infestations, when the same non-host herbivore damages different organs of the same plant species. In this scenario we investigated the responses of egg parasitoids to feeding and oviposition damage using a model system consisting of Vicia faba, the above-ground insect herbivore Nezara viridula, the above- and below-ground insect herbivore Sitona lineatus, and Trissolcus basalis, a natural enemy of N. viridula. We demonstrated that the non-host S. lineatus disrupts wasp attraction toward plant volatiles induced by the host N. viridula. Interestingly, V. faba damage inflicted by either adults (i.e., leaf-feeding) or larvae (i.e., root-feeding) of S. lineatus, had a similar disruptive effect on T. basalis host location, suggesting that a common interference mechanism might be involved. Neither naïve wasps or wasps with previous oviposition experience were attracted to plant volatiles induced by N. viridula when V. faba plants were concurrently infested with S. lineatus adults or larvae. Analysis of the volatile blends among healthy plants and above-ground treatments show significant differences in terms of whole volatile emissions. Our results demonstrate that induced plant responses caused by a non-host herbivore can disrupt the attraction of an egg parasitoid to a plant that is also infested with its hosts.