Soldier crab (Dotilla myctiroides) distribution,food resources and subsequent role in organic matter fate in Ao Tang Khen,Phuket, Thailand |
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| Authors: | Kimberly K Takagi Phaothep Cherdsukjai Izumi Mimura Yuka Yano Kanjana Adulyanukosol Makoto Tsuchiya |
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| Institution: | 1. Graduate School of Engineering and Science, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 903-0213, Japan;2. Phuket Marine Biological Center, P.O. Box 60, Phuket 83000, Thailand;3. Faculty of Science, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Okinawa 901-0213, Japan |
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| Abstract: | This study aimed to elucidate Dotilla myctiroides (H. Milne-Edwards) food resources and how the soldier crab influences the organic matter composition on the intertidal flat. A preliminary assessment of D. myctiroides size, sex, and population distribution was conducted to clarify the characteristics of the inhabiting population. Overall, D. myctiroides size and abundance was normal across the tidal flat area. Comparison of different sediment types from the soldier crab habitat (surface sediments, igloos, burrow lining, burrow pellets, feeding pellets, and feces) using the fatty acid (FA) analysis technique revealed D. myctiroides removes organic matter via the significantly lower contributions of polyunsaturated FAs, essential FAs, and dinoflagellates in the feeding pellets. Dotilla myctiroides tissue analysis of the hepatopancreas and hindgut in individuals that had been starved for 24 h confirmed not only the consumption of dinoflagellates, but diatoms and macroalgae as well. In addition, the FA metabolism within the digestive system implied the ability of the soldier crab to synthesize highly unsaturated FAs (HUFAs) such as 20:4n–6, 20:5n–3 and 22:6n–3. |
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| Keywords: | organic matter Dotilla myctiroides fatty acids biomarkers Thailand Phuket Ao Tang Khen (7° 48&prime 44&Prime N 98° 24&prime 17&Prime E) |
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