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MS ISLAM, T UEHARA, S SHOKITA AND MA RAHMAN

Feeding Ecology of the Sesarmid Crab Neosarmatium trispinosum Davie (Crustacea: Brachyura) from the Mangroves of the Ryukyu Islands, Japan. MS ISLAM, T UEHARA, S SHOKITA AND MA RAHMAN. Faculty of Science, University of the Ryukyus, Okinawa, Japan. General aims. Specific aims. Sampling.

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MS ISLAM, T UEHARA, S SHOKITA AND MA RAHMAN

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  1. Feeding Ecology of the Sesarmid Crab Neosarmatium trispinosum Davie (Crustacea: Brachyura) from the Mangroves of the Ryukyu Islands, Japan MS ISLAM, T UEHARA, S SHOKITA AND MA RAHMAN Faculty of Science, University of the Ryukyus, Okinawa, Japan

  2. General aims Specific aims

  3. Sampling Stomach Feeding C/N ratio Nutritional analysis experiment analysis analysis Stomach Leaf Leaves and Mangrove fullness consumption sediments leaves Stomach Leaf Crab Crab contents preference faeces tissues Statistical Analysis Stat View 5.0

  4. Map of samples collection sites on the Ryukyu Islands, Japan.

  5. Overview of Shira mangroves on Iriomote Island, Okinawa, Japan

  6. Shira River on Iriomote Island, during low tide

  7. Shira River on Iriomote Island, during high tide

  8. Sampling station of Shira mangroves, during low tide

  9. Sampling station of Shira mangroves, during high tide

  10. Study species, the mangrove sesarmid crab Neosarmatium trispinosum Davie

  11. Green leaves Yellow leaves Brown leaves Three different types of Bruguiera gymnorrhiza mangrove leaves used for feeding experiments, C/N ratio and nutritional analysis. Scale = 5 cm.

  12. Stomach fullness (%) Seasons Sexes Islands Stomach fullness of N. trispinosum. SS, Miyako Island; SR, Iriomote Island; NR, Okinawa Island. Bars with different letters are significantly different (P<0.0001, Statview ANOVA).

  13. Sexes Percentage occurrence (%) Percentage occurrence (%) Seasons Islands Food categories Food categories Stomach content analysis of N. trispinosum. NF, not found; SS, Shimajiri swamp on Miyako Island;SR, Shira River on Iriomote Island;NR, Nuha River on Okinawa Island.

  14. Consumption rate (%) Growth by body weight (%) Supplied mangrove leaves Supplied mangrove leaves Consumption rate and growth by body weight of N. trispinosum. Data indicate mean (±SD), N=24. Bars with different letters are significantly different (P<0.0001, Fisher’s PLSD).

  15. Supplied separately Supplied together Changes in appearance of B. gymnorrhiza mangrove leaves by N. trispinosum.

  16. First choice Second choice Third choice Preference of B. gymnorrhiza mangrove leaves by N. trispinosum.

  17. TOM (mg/g dry wt.) C/N ratios TC (mg/g dry wt.) TN (mg/g dry wt.) NR=Nuha River Burrow leaves SR=Shira River TC, TN and TOM contents, and C/N ratio in burrow leaves. Bars with different letters are significantly different (P<0.0001, Fisher’s PLSD).

  18. TOM (mg/g dry wt.) C/N ratios TC (mg/g dry wt.) TN (mg/g dry wt.) NR=Nuha River SR=Shira River Burrow sediments TC, TN and TOM contents, and C/N ratio in burrow sediments. Bars with different letters are significantly different (P<0.0001, Fisher’s PLSD).

  19. C/N = 52 C/N = 22 C/N ratios C/N ratios NR NR SR SR Leaves Sediments NR=Nuha River SR=Shira River C/N = 17-20, a value suggested as a general maximum for sustainable animal nutrition by Russel-Hunter (1970). Comparison of C/N ratio in burrow leaves and sediments.

  20. C/N ratios Leaf processing C/N ratio in mangrove leaves, processed by N. trispinosum. Bars with different letters are significantly different (P<0.0001, Fisher’s PLSD).

  21. C/N ratios Crab faeces C/N ratio in faeces of N. trispinosum. Bars with different letters are significantly different (P<0.0001, Fisher’s PLSD).

  22. Present study and literature records of C/N ratio in leaves and sediments from mangroves- a habitat of sesarmid crabs.

  23. Carbohydrate (g/100g) Energy (kcal/100g) Nutritional composition of mangrove leaves at wet conditions (g/100g).

  24. THANK YOU ALL FOR KIND ATTENTION

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