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|Title: ||The ecology of larval and metamorphosing lampreys.|
|Authors: ||Dawson, H.A.|
Almeida, Pedro R.
|Editors: ||Docker, M.F.|
|Keywords: ||Age at metamorphosis|
|Issue Date: ||2015|
|Citation: ||Dawson, H.A.; B.R. Quintella; P.R. Almeida; A.J. Treble & J.C. Jolley (2015). The ecology of larval and metamorphosing lampreys. In: M.F. Docker (Ed.). Lampreys: Biology, Conservation and Control. Volume I. Springer, Fish & Fisheries Series, 37: 75-138.|
|Abstract: ||The life cycle of lampreys typically begins in streams where fertilized
eggs hatch into small, wormlike larvae (ammocoetes) which burrow into soft stream
bottoms where they filter feed on organic matter until the onset of metamorphosis.
The relative importance of habitat variables can change with ammocoete size
(and depending on the spatial scale measured), but habitat must provide adequate
substrate for burrowing and a regular supply of the suspended organic matter upon
which larval lampreys feed. Larval movement occurs significantly more often at
higher densities and in warmer temperatures, and typically occurs in a downstream
direction at night. Sex ratio of some lamprey species is often related to differences
in larval density, with the proportion of males increasing with relative density. Larval
mortality is thought to be high in the egg phase, immediately following hatching,
and at metamorphosis. The duration of the larval period in the life cycle of
lampreys has been found to vary among and within species, but generally ranges from 3 to 7 years. However, analyses of larval growth and duration of larval life
have been hampered by the unreliability of age assessment methods for larval lampreys.
Metamorphosis begins during the summer months, when water temperatures
are the most favorable, and is completed by winter or early spring.|
|Appears in Collections:||BIO - Publicações - Capítulos de Livros|
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