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Effect of melatonin on hemolymph glucose and lactate levels in the fiddler crabUca pugilator

✍ Scribed by Tilden, Andrea ;McGann, Liz ;Schwartz, Janine ;Bowe, Adina ;Salazar, Christina

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
95 KB
Volume
290
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Melatonin was injected into intact and eyestalk‐ablated fiddler crabs (Uca pugilator), and its effects on hemolymph glucose and lactate levels were studied. In intact crabs, glucose and lactate levels cycled simultaneously, with peaks occurring during early and late photophase. Melatonin caused a shift in the glucose and lactate cycles, with only one peak occurring closer to mid‐photophase. In eyestalk‐ablated animals, the glucose rhythmicity was lost; lactate cycled, but levels were significantly lower than in intact animals. Melatonin caused a delayed hyperglycemia in eyestalk‐ablated animals, with concurrent but much lower increases in lactate. Overall, melatonin demonstrated delayed hyperglycemic effects that do not appear to be mediated solely via eyestalk factors such as crustacean hyperglycemic hormone (CHH), though involvement of the eyestalks cannot be ruled out. An influence on extra‐eyestalk CHH secretion is a potential mechanism of melatonin activity. J. Exp. Zool. 290:379–383, 2001. © 2001 Wiley‐Liss, Inc.

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