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Social communication of predator-induced changes in Drosophila behavior and germ line physiology.

ABSTRACT: Behavioral adaptation to environmental threats and subsequent social transmission of adaptive behavior has evolutionary implications. In Drosophila, exposure to parasitoid wasps leads to a sharp decline in oviposition. We show that exposure to predator elicits both an acute and learned oviposition depression, mediated through the visual system. However, long-term persistence of oviposition depression after predator removal requires neuronal signaling functions, a functional mushroom body, and neurally driven apoptosis of oocytes through effector caspases. Strikingly, wasp-exposed flies (teachers) can transmit egg-retention behavior and trigger ovarian apoptosis in naive, unexposed flies (students). Acquisition and behavioral execution of this socially learned behavior by naive flies requires all of the factors needed for primary learning. The ability to teach does not require ovarian apoptosis. This work provides new insight into genetic and physiological mechanisms that underlie an ecologically relevant form of learning and mechanisms for its social transmission.

SUBMITTER: Kacsoh BZ

PROVIDER: S-EPMC4456452 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature

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Social communication of predator-induced changes in Drosophila behavior and germ line physiology.

Kacsoh Balint Z BZ Bozler Julianna J Ramaswami Mani M Bosco Giovanni G

eLife 20150513

Behavioral adaptation to environmental threats and subsequent social transmission of adaptive behavior has evolutionary implications. In Drosophila, exposure to parasitoid wasps leads to a sharp decline in oviposition. We show that exposure to predator elicits both an acute and learned oviposition depression, mediated through the visual system. However, long-term persistence of oviposition depression after predator removal requires neuronal signaling functions, a functional mushroom body, and ne ...[more]

PMID: 25970035

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Project description:Learning processes in Drosophila have been studied through the use of Pavlovian associative memory tests, and these paradigms have been extremely useful in identifying both genetic factors and neuroanatomical structures that are essential to memory formation. Whether these same genes and brain compartments also contribute to memory formed from nonassociative experiences is not well understood. Exposures to environmental stressors such as predators are known to induce innate behavioral responses and can lead to new memory formation that allows a predator response to persist for days after the predator threat has been removed. Here, we utilize a unique form of nonassociative behavior in Drosophila where female flies detect the presence of endoparasitoid predatory wasps and alter their oviposition behavior to lay eggs in food containing high levels of alcohol. The predator-induced change in fly oviposition preference is maintained for days after wasps are removed, and this persistence in behavior requires a minimum continuous exposure time of 14 hr. Maintenance of this behavior is dependent on multiple long-term memory genes, including orb2, dunce, rutabaga, amnesiac, and Fmr1. Maintenance of the behavior also requires intact synaptic transmission of the mushroom body. Surprisingly, synaptic output from the mushroom body (MB) or the functions of any of these learning and memory genes are not required for the change in behavior when female flies are in constant contact with wasps. This suggests that perception of this predator that leads to an acute change in oviposition behavior is not dependent on the MB or dependent on learning and memory gene functions. Because wasp-induced oviposition behavior can last for days and its maintenance requires a functional MB and the wild-type products of several known learning and memory genes, we suggest that this constitutes a paradigm for a bona fide form of nonassociative long-term memory that is not dependent on associated experiences.

Project description:IntroductionSocial and Behavior Change Communication (SBCC) plays a critical role in improving behavior and health outcomes across the continuum of healthcare. Failing to implement tailored SBCC strategies continues to pose a risk of ill health, increase disease burden, and impact the quality life of people. In Ethiopia, front-line healthcare system actors' knowledge and skills about SBCC have not been rigorously assessed. Thus, the current study aimed to assess healthcare system actors' competencies in designing, implementing, monitoring, and evaluating SBCC interventions in Ethiopia.MethodsA cross-sectional study was conducted between 01 August and 31 October, 2020. Five hundred twenty-eight frontline healthcare system actors in SBCC in Ethiopia were included using simple random sampling technique. Data was collected using a self-administered structured questionnaire adopted from Communication for Change; SBCC capacity assessment tool. Descriptive analysis frequencies, percentages, mean, median, standard deviation (SD), interquartile range (IQR) were employed. Besides correlations and linear regression with robust standard errors were carried out. A 95% confidence interval and a p-value of less than 0.05 were used to declare significant statistical association.ResultsA total of 488 frontline workers participated in the study, with a response rate of 92.4%. The mean SBCC knowledge score was 13.2 ± standard deviation (SD) 3.99 and 59.2% scored below 60% of the expected maximum score. The standard mean score of overall skill in SBCC intervention was 2.36 (SD ± 0.98) and 52.6% of them scored below mean score. The SBCC knowledge was significantly predicted by the service year and the regional variation. On the other hand, SBCC skills was significantly predicted by sex, service year, profession, regional variation, and SBCC knowledge. The regional variation was the main predictor of both knowledge and skill on SBCC. The regression models explained 23.1% and 50.2% of the variance in knowledge and skill of SBCC, respectively.ConclusionFront-line healthcare system actors in Ethiopia has low knowledge and skills in SBCC. Variations in SBCC knowledge and skill were observed based on demographic and professionals experience related characteristics. Hence, continuous capacity building activities need to be given to frontline healthcare system actors to enhance their knowledge and skill on SBCC program and achieve the intended health results.

Dataset Information

Social communication of predator-induced changes in Drosophila behavior and germ line physiology.

Publications

Social communication of predator-induced changes in Drosophila behavior and germ line physiology.

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