Khảo sát sự hiện diện của vi sinh vật phân giải cellulose trong dạ dày còng Perisesarma eumolpe tại khu vực gãy đổ thuộc rừng ngập mặn Cần Giờ=The presence of cellulose-degrading microorganisms in Perisesarma eumolpe crab’s stomach at opened areas of Can Gio mangrove forest

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Tác giả: Trọng Nhân Nguyễn, Ngọc Diễm My Trần

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Phát triển Khoa học & Công nghệ: Chuyên san Khoa học Tự nhiên, 2018

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Nghiên cứu thực hiện nhằm xác định sự hiện diện vi sinh vật phân giải cellulose trong dạ dày còng Perisesarma eumolpe. Còng P. eumolpe được thu mẫu ở khu vực gãy đổ của rừng ngập mặn Cần Giờ do bão Durian năm 2006. Nghiên cứu đã phân lập được 520 mẫu vi sinh vật từ 30 mẫu dạ dày còng Perisesarma eumolpe. Vi sinh vật phân giải cellulose được phân lập trên ba loại môi trường như cao thịt – peptone, Gause và Czapek – Dok có bổ sung CMC làm nguồn carbon duy nhất. Trong 520 mẫu vi sinh vật có 496 mẫu vi khuẩn hiếu khí, 24 mẫu xạ khuẩn và không ghi nhận thấy có nấm mốc. Số lượng mẫu vi sinh vật phân giải cellulose chiếm 46% tổng số mẫu vi sinh vật phân lập được từ dạ dày còng (240 mẫu). Nghiên cứu cũng ghi nhận được hình thái và đặc điểm khuẩn lạc của 24 chủng vi khuẩn hiếu khí và 5 chủng xạ khuẩn xuất hiện trong dạ dày còng. Mật độ vi sinh vật trung bình ở mỗi dạ dày còng từ 0,66 ×105 đến 6,6 ×105 tế bào/mL. Kết quả này cũng cho thấy nhóm vi sinh phân giải cellulose có thể góp phần quan trọng vào việc phân giải nguồn thức ăn chứa nhiều cellulose được tiêu thụ bởi còng P. eumolpe trong quá trình sống của chúng ở rừng ngập mặn.The study was conducted to determine the presence of cellulose-degrading microorganisms which were living in the stomach of Perisesarma eumolpe crabs. P. eumolpe were collected in the gap of Can Gio mangrove caused by Durian typhoon in 2006. The study identified 520 microorganism samples from 30 stomach samples Cellulose degrading microbacteria were isolated on three types of nutrient media meat extract – peptone, Gause and Czapek – Dok with CMC. These 520 microbial samples included of 496 aerobic bacteria, 7 actinomycetes and 0 mold samples. The number of cellulose degrading microorganisms was also accounted for 46% of total (240 samples). Among these, there were 24 bacteria strains and 5 actinomycetes strains which degradated cellulose based on the difference in the colony and the cell shape. The average microbial density per crab gut was approximately 0.66 ×105 to 6.6 ×105 cell/mL. In addition, the results showed that cellulose degrading microorganism groups have importantly contributed to the food sources for P. eumolpe during their living in the mangrove forest.

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