- 期刊
Possible function of discharge newly discovered from the hedgehog seahorse Hippocampus spinosissimus
摘要
Three types of discharge were observed to be released from captive specimens of the hedgehog seahorse Hippocampus spinosissimus: feces and two other newly discovered types. Of the latter two, one (＂type 2 discharge＂) was a translucent mucus that was expelled from the anus and was clearly not feces; upon microscopic observation, it remained in the water column longer than feces and was more likely to adhere to artificial holdfasts. Seahorses were significantly more likely to perch on holdfasts containing this discharge (p＜0.01), possibly via their detecting of its smell (i.e., olfactory behavior). Preliminary tests revealed that the active components of type 2 discharge are significantly water-soluble (p＜0.05). We surmise that this discharge expulsion behavior may be the mechanism by which seahorses ＂mark their territory＂ and establish site fidelity.
關鍵字
defecation ； holdfast ； Hippocampus spinosissimus ； ichthyology ； olfactory cues ； seahorse ； site fidelity ； Taiwan延伸閱讀
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