Multimodel inference to quantify the relative importance of abiotic factors in the population dynamics of marine zooplankton

The effect of multiple stressors on marine ecosystems remains poorly understood and most of the knowledge available is related to phytoplankton. To partly address this knowledge gap, we tested if combining multimodel inference with generalized additive modelling could quantify the relative contribution of environmental variables on the population dynamics of a zooplankton species in the Belgian part of the North Sea. Hence, we have quantified the relative contribution of oceanographic variables (e.g. water temperature, salinity, nutrient concentrations, and chlorophyll a concentrations) and anthropogenic chemicals (i.e. polychlorinated biphenyls) to the density of Acartia clausi. We found that models with water temperature and chlorophyll a concentration explained ca. 73% of the population density of the marine copepod. Multimodel inference in combination with regression-based models are a generic way to disentangle and quantify multiple stressor-induced changes in marine ecosystems. Future-oriented simulations of copepod densities suggested increased copepod densities under predicted environmental changes

Comparison of Social Valdidity Ratings with the Effects of a Video-feedback Intervention for Communication Partners of Individuals with Deafblindness

The parents, teachers, and professional caregivers of individuals with disabilities may benefit from interventions to enhance their educational skills. In previous studies, positive effects were observed of a video-feedback intervention for caregivers (i.e. parents, teachers, and professional caregivers) on their communication with an individual with congenital deafblindness. The intervention they received, was the High-Quality Communication (HQC) intervention. The aim of the current study was to gain insight into the perceived relevance, feasibility, and effectiveness (i.e., social validity) of the HQC-intervention according to these caregivers, and the correspondence between the social validity ratings and the observational effects of the HQC-intervention. Responses on the Social Validity Scale from 25 caregivers who participated in the High-Quality Communication (HQC) intervention revealed that they considered the HQC intervention to be a relevant, feasible, and effective intervention. Comparing the caregiver ratings with observational effects of the HQC intervention at the individual case level, we found no association between the observed effectiveness of this intervention and caregivers’ opinions about its relevance, feasibility and effectiveness. There was however, an association between the rated feasibility and effectiveness, which suggests that the perceived success of the intervention was influenced by caregivers’ experienced competency in supporting the communication of individuals with CDB. The combination of observational and social validity data enabled a critical analysis of the clinical value of the HQC intervention. We recommend that future studies use multiple data source for social validity assessment

Applying Erikson’s theory of psychosocial development to understand autonomy development in children and youths with deafblindness:a systematic literature review

This systematic review revealed how children and youths with congenital deafblindness (CDB) exhibit autonomy characteristics and how caregivers perform autonomy support, which Erikson described as part of the first three stages of psychosocial development. This review comprises 22 studies that explicitly addressed one or more autonomy characteristics or autonomy support tasks. The results demonstrated that children and youths with CDB exhibited most characteristics of Erikson’s first stage (e.g., explorative behavior in their nearby environment and with objects within reach) and caregivers predominantly fulfilled autonomy tasks in the first stage (e.g., being present and near the child). In addition, children and youths with CDB exhibited independent acts at the second stage, although these were often limited to asking for or refusing concrete objects in the here-and-now situation. The limited degree to which the children with CDB exhibited autonomy characteristics from the second and third stages seems to co-occur with their struggle to develop symbolic communication. Additionally, the review revealed that caregivers supported autonomy by remaining present and nearby, even when autonomy support tasks from the second and third stages might be more appropriate in supporting the autonomy of children and youths with CDB (e.g., the second stage’s autonomy support task to balance between offering the child protection and encouragement, and the third stage’s task to support the child in taking initiative and setting goals). We recommend the use of a longitudinal video-feedback intervention that both supports the children’s and youths symbolic communication skills and supports caregivers in finding a balance between being present and nearby and fostering the autonomy characteristics of children and youths with CDB

Multiparty conversations with people with congenital deafblindness:Operationalization, significance, and requirements

Typically developing children are exposed to multiparty communication on a daily basis from birth. This facilitates both group belonging and observational learning. However, involvement in multiparty conversations is not self-evident for people with congenital deafblindness due to their dual sensory impairment. This study explored the added value of multiparty conversations for people with congenital deafblindness by analyzing communication partners' narrations of their experiences. Three focus group sessions were conducted with professionals and relatives (n = 24) of people with congenital deafblindness. These sessions were audiotaped, transcribed, and coded using thematic analysis. Participants described the following defining characteristics of multiparty conversations in relation to congenital deafblindness: a minimum of three people involved, with at least one who has congenital deafblindness; awareness of the presence of the other communication partners; attention for the communicative setting; and the use of communication means that are familiar to all communication partners. In their experience, multiparty conversations supported social, emotional, and communication development. Furthermore, focus group participants indicated that spontaneous multiparty conversations with people with congenital deafblindness were scarce and, therefore, needed to be encouraged by communication partners. The participants considered positive beliefs, preparation of the multiparty conversation, repetitions, and a low communication speed as important partner competencies to support the involvement of individuals with congenital deafblindness in multiparty conversations. Accordingly, we recommend the development of an intervention protocol for communication partners to initiate and foster multiparty conversations with people with congenital deafblindness. Another recommendation is to test the effects of MPC on the observational learning of people with congenital deafblindness

Monitoring communication development between teachers and their students with congenital deafblindness:An application of the Layered Communication Model

The Layered Communication Model (LCM) consists of three layers of intersubjective development divided into different communicative behaviors per layer. Earlier research showed that the LCM can be used to describe the communication level between teachers and their students with congenital deafblindness (CDB). This study analyzed whether the LCM can also be used to monitor the development of LCM behaviors over time. Videos of eight student-teacher dyads recorded at the start of this study (baseline phase) and 5 months later (follow-up phase) were coded using 10-s partial interval coding. The presence of the communicative behaviors at the three layers of the LCM during baseline and follow-up were calculated and compared between dyads and phases. The results on the presence of LCM behaviors were in line with earlier research. The presence of primary layer behaviors was comparable between dyads, confirming that this is a basic communication layer. The differences found between dyads in the presence of secondary and tertiary layer behaviors shows that these can be used to determine a dyad's communicative level. Results also showed that the LCM can be used to monitor communication development. Small increases were found in the presence of LCM behaviors between baseline and follow-up for the primary layer behaviors, but larger increases were found for secondary and tertiary layer behaviors, showing that development can be monitored. In conclusion, this study again showed that the LCM can be used to describe a dyad's communicative level. We also found increases in the presence of certain behaviors between baseline and follow-up for all dyads, which shows that the LCM can also be used to monitor communication over time. More insight into the period between the analyzed phases is suggested to analyze what might have caused the increase in presence of behaviors. This would reveal more about the use of the LCM as a tool to improve communication development

Gonadotropin-Releasing Hormone and Adipokinetic Hormone Signaling Systems Share a Common Evolutionary Origin

Gonadotropin-releasing hormone (GnRH) is a critical and central hormone that regulates vertebrate reproduction. The high conservation of GnRH signaling within the chordates (deuterostomians) raises the important question as to whether its appearance might date back prior to the divergence of protostomian and deuterostomian lineages, about 700 million years ago. This leads to several important questions regarding the evolution of the GnRH family. Has GnRH been retained in most protostomian lineages? And was regulation of reproduction already a function of ancestral GnRH? The first question can undoubtedly be answered affirmatively since several GnRH-like sequences have been found in wide variety of protostomian and deuterostomian phyla. However, based on their different primary functions in different phyla – which implies a less unanimous answer on the second question – consistency in the nomenclature of this peptide family has been lost. A comparative and phylogenetic approach shows that the ecdysozoan adipokinetic hormones (AKHs), lophotrochozoan GnRHs and chordate GnRHs are structurally related and suggests that they all originate from a common ancestor. This review supports the view that the AKH–GnRH signaling system probably arose very early in metazoan evolution, prior to the divergence of protostomians and deuterostomians

Need support in students with visual impairments:Comparing teacher and student perspectives.

According to self-determination theory (SDT), need-supportive teaching positively influences students’ engagement to learn. Need-supportive teaching involves teachers providing students with structure, autonomy support, and involvement. It enables teachers to support students’ psychological needs to feel competent, autonomous, and related. Supporting students’ needs consequently has a positive influence on students’ engagement to learn. Little is known about need-supportive teaching in the education of students with visual impairments. In this study, we used a questionnaire to assess the self-reported provision of need support by teachers of students with visual impairments, the students’ perceived need support, and the students’ behavioral and emotional engagement. Seven teachers and 48 students filled in questionnaires based on SDT. In general, mean scores were positive. The teachers’ mean scores for the need support they provided, the students’ mean scores for their perceived need support, and the students’ mean scores for engagement all ranged between 3 and 4 on a 5-point scale. The teachers and students scored highest on involvement, followed by structure, and then autonomy support. When looking at scores on an individual student level, we found large differences between students in the same class, which implies that need support requires an individualized approach. Hence, teachers need to be aware of their students’ individual needs for structure, autonomy support, and involvement and should adjust their need-supportive teaching accordingly, thereby enabling teachers to have a positive impact on the engagement of students with visual impairments