Feeding Ecology of the Sesarmid Crab
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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

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


Ms islam t uehara s shokita and ma rahman

General aims

Specific aims


Ms islam t uehara s shokita and ma rahman

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






Ms islam t uehara s shokita and ma rahman

Sampling Japanstation of Shira mangroves, during low tide


Ms islam t uehara s shokita and ma rahman

Sampling Japanstation of Shira mangroves, during high tide


Ms islam t uehara s shokita and ma rahman

Study species, the mangrove sesarmid crab JapanNeosarmatium trispinosum Davie


Ms islam t uehara s shokita and ma rahman

Green leaves Japan

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.


Ms islam t uehara s shokita and ma rahman

Stomach fullness (%) Japan

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).


Ms islam t uehara s shokita and ma rahman

Sexes Japan

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.


Ms islam t uehara s shokita and ma rahman

Consumption rate (%) Japan

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).


Ms islam t uehara s shokita and ma rahman

Supplied separately Japan

Supplied together

Changes in appearance of B. gymnorrhiza mangrove leaves by N. trispinosum.


Ms islam t uehara s shokita and ma rahman

First choice Japan

Second choice

Third choice

Preference of B. gymnorrhiza mangrove leaves by N. trispinosum.


Ms islam t uehara s shokita and ma rahman

TOM (mg/g dry wt.) Japan

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).


Ms islam t uehara s shokita and ma rahman

TOM (mg/g dry wt.) Japan

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).


Ms islam t uehara s shokita and ma rahman

C/N = 52 Japan

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.


Ms islam t uehara s shokita and ma rahman

C/N ratios Japan

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).


Ms islam t uehara s shokita and ma rahman

C/N ratios Japan

Crab faeces

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


Ms islam t uehara s shokita and ma rahman

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


Ms islam t uehara s shokita and ma rahman

Carbohydrate (g/100g) and sediments from mangroves- a habitat of sesarmid crabs.

Energy (kcal/100g)

Nutritional composition of mangrove leaves at wet conditions (g/100g).


Ms islam t uehara s shokita and ma rahman

THANK YOU ALL FOR KIND ATTENTION and sediments from mangroves- a habitat of sesarmid crabs.