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

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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

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


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


Overview of Shira mangroves on Iriomote Island, Okinawa, Japan


Shira River on Iriomote Island, during low tide


Shira River on Iriomote Island, during high tide


Sampling station of Shira mangroves, during low tide


Sampling station of Shira mangroves, during high tide


Study species, the mangrove sesarmid crab Neosarmatium trispinosum Davie


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.


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).


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.


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).


Supplied separately

Supplied together

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


First choice

Second choice

Third choice

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


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).


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).


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.


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).


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).


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


Carbohydrate (g/100g)

Energy (kcal/100g)

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


THANK YOU ALL FOR KIND ATTENTION


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