Seagrass ecosystem is one of the most productive ecosystems in coastal waters providing numerous ecological functions and supporting a large biodiversity. However, various anthropogenic stressors including climate change are impacting these vulnerable habitats. Here, we investigated the independent and combined effects of ocean warming and ocean acidification on plant–herbivore interactions in a tropical seagrass community. Direct and indirect effects of high temperature and high pCO2 on the physiology of the tropical seagrass Thalassia hemprichii and sea urchin Tripneustes gratilla were evaluated. Productivity of seagrass was found to increase under high pCO2, while sea urchin physiology including feeding rate decreased particularly under high temperature. The present study indicated that future climate change will affect the bottom-up and top-down balance, which potentially can modify the ecosystem functions and services of tropical seagrass ecosystems.
THE WORKSHOP OF COMPILATION OF SCIENCE OLYMPIAD LEADING PROGRAM IN MADRASAH IBTIDAIYAH MUHAMMADIYAH TEGALAMPEL, KLATEN. The purpose of this social service activity were to provide knowledge and insights related to the science olympiad (OSN) to the headmaster and teachers of MIM Tegalampel as well as assisted the compilation of work programs and committee of MIM Tegalampel. Materials that provided were OSN, best practices, and compilation of work program and committee. The model used was a workshop model with lecture, demonstration, question and answer and hands-on practice method. Evaluation was done by disseminating information and motivation to participants and product checklists. Generally, participants claimed that the schedule training was appropriate, time sharing (lectures, group discussions, individual assignments, presentations and games) were also perceived positively by participants. Participants were satisfied with the topics presented and perceived that most of the expectations and objectives of the workshop were fulfilled. The evaluation results indicate that the material delivered can be followed well and there was an increase in knowledge and motivation. In addition, the OSN work program and committee have also been arranged quite well.
Seagrasses are foundation plant species as they not only create their own habitat but also for other marine organisms. In estuarine and marine environments, they form beds and their leafy structure are the excellent substrate for the epiphytes. In this study, we aimed to investigate the percentage cover of epiphytes on the seagrass beds in Sepanjang Beach, Indonesia. 5 transect lines with 20 m in length with the 50 x 50 cm quadrat at the interval of 5 m were placed at the perpendicular angle to the shoreline. These transects were positioned from the furthermost of the western part to the middle part of the beach, represented the gradation level of human activities. The result showed that the percentage cover of epiphytes was significantly higher on the middle part of the beach compared to the side of the beach. This present study suggest that human activities could lead to the increasing of epiphytes cover on the seagrass beds.
Seagrass ecosystems are classified as one of the most productive ecosystems in coastal waters providing numerous of ecological functions, however various anthropogenic stressors including climate change are impacting these vulnerable habitats. Here, we investigated the independent and combined effects of ocean warming and ocean acidification on plant-herbivore interactions in a tropical seagrass community. Direct and indirect effects of high temperature and high pCO2 on the physiology of the tropical seagrass Thalassia hemprichii and sea urchin Tripneustes gratilla were evaluated. Productivity of seagrass was found to synergistically increase under the combination of high temperature and high pCO2, while sea urchin physiology including feeding rate decreased particularly under high temperature. The present study indicated that future climate change will affect the botom-up and top-down balance leading to a shift to a seagrass-dominated ecosystem, which potentially decrease biodiversity as well as ecosystem functions and services of tropical seagrass meadows.
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