Mangrove memiliki peranan yang sangat penting sebagai pelindung wilayah pesisir dari angin kencang, gelombang dan abrasi air laut. Keberadaan mangrove di wilayah pesisir Aceh, saat ini semakin berkurang karena dialihfungsikan menjadi areal perumahan dan pertambakan. Tanaman mangrove yang tumbuh pasca tsunami tidak mendapatkan perhatian sehingga kondisinya tidakterawat dan ditemukan adanya kerusakan tanaman mangrove. Penelitian ini bertujuan untuk mengidentifikasi jenis-jenis kerusakan pada tanaman mangrove di pesisir pantai Kota Banda Aceh dan Aceh Besar. Penelitian ini menggunakan metode observasi dengan pengamatan secara visual. Pengamatan yang dilakukan meliputi kondisi morfologi akar, batang, dan daun. Selanjutnya data dianalisis secara deskriptif dan studi literatur. Hasil penelitian menemukan 2 spesies mangrove di lokasi yaitu bakau kurap (Rhizophora mucronata) dan api-api (Avicennia marina). Kerusakan tanaman mangrove ditemukan pada bagian daun dan bagian batang. Kerusakan tersebut disebabkan oleh kekurangan unsur hara, serangan jamur (Fungi), serangan keong mangrove (Littoraria sp.), laba-laba (Arachnida), serangga ulat kantung (Pagodiella hekmeyeri), serangga kutu daun putih (Hemiptera), dan lumut kerak (Lichen). Berdasarkan hasil penelitian ini maka diperlukan penanganan serius terhadap kerusakan tanaman mangrove untuk menjaga kelestarian plasma nutfah mangrove di wilayah pesisir Aceh.
Realistics mathematics educations (RME) has succeeded in shifting behavioristic mathematics learning to more constructive. RME deals with the process of learning, which helps the students to think and communicate mathematically. Therefore, RME is helpful in promoting student's problem-solving skills and mathematics communications in learning. The instructional with RME approach will be more effective if the performance of students' achievement in problem-solving and mathematics communications better than not use MRE approach or conventional approach. The purpose of this research was to examine the effect of the realistic mathematics approach on problem-solving and mathematics communications effectivity in learning. The results of quasi-experimental indicated that the MRE approach fulfilled the direct effect on problem-solving and mathematics communications effectivity. This data provide support for the claim that RME approach is superior in comparison to conventional teaching. Students in the experimental group showed an overall favorable view towards the implementation of MRE approach. They viewed that the RME approach provides an opportunity for students to be more active in learning and have a positive attitude towards mathematics subjects.
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