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- W2025853587 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 157:277-286 (1997) - doi:10.3354/meps157277 Metamorphosis of the blue crab Callinectes sapidus: effects of humic acids and ammonium Richard B. Forward, Jr1,*, Richard A. Tankersley2, Dimitri Blondel1, Daniel Rittschof1 1Duke University, Nicholas School of the Environment, Marine Laboratory, 135 Duke Marine Lab Rd, Beaufort, North Carolina 28516, USA 2Department of Biological Sciences, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland 21228-5398, USA *E-mail: rforward@mail.duke.edu Postlarvae (megalopae) of the blue crab Callinectes sapidus are transported from offshore/coastal areas into estuaries where they metamorphose (molt) to the first crab stage. Metamorphosis is accelerated by exposure to chemical cues in estuarine water. The present study tested the hypothesis that estuarine dissolved humic acids and ammonium serve as cues for accelerating metamorphosis. Estuarine humic acids are attractive as estuarine specific cues because they enter estuaries through freshwater inflow but precipitate as the salinity increases. Thus, estuarine humic acids are present in estuaries but occur in very low concentrations in coastal/offshore areas. Chemical cues that accelerate metamorphosis were present in river water entering an estuary. The time to metamorphosis decreased upon exposure to increasing concentrations of humic acids extracted from river water and to commercial humic acids. Thus, dissolved humic acids can serve as a cue for being in an estuary. High concentrations of ammonium chloride (25 µM and greater) delayed metamorphosis in estuarine water and reversed the accelerating effects of humic acids. Since high levels of ammonium usually occur in areas of low oxygen levels, this response may prevent megalopae from metamorphosing in these areas, which are less conducive to survival. Blue crab · Callinectes sapidus · Megalopae · Metamorphosis · Humic acids · Ammonium Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 157. Publication date: October 16, 1997 Print ISSN:0171-8630; Online ISSN:1616-1599 Copyright © 1997 Inter-Research." @default.
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- W2025853587 title "Metamorphosis of the blue crab Callinectes sapidus:effects of humic acids and ammonium" @default.
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