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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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slide1

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

slide2

General aims

Specific aims

slide3

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

slide11

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.

slide12

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).

slide13

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.

slide14

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).

slide15

Supplied separately

Supplied together

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

slide16

First choice

Second choice

Third choice

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

slide17

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).

slide18

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).

slide19

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.

slide20

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).

slide21

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).

slide22

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

slide23

Carbohydrate (g/100g)

Energy (kcal/100g)

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

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