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Publications

Publications from USGS science centers throughout the Southeast Region.

Filter Total Items: 9967

Feeding chronology of juvenile piranhas, Pygocentrus notatus, in the Venezuelan llanos

During the 1988 rainy season, I studied the 24 h feeding chronology of juvenile (40–68 mm standard length) piranhas, Pygocentrus notatus (Characidae: Serrasalminae) from a natural population inhabiting a small savanna stream in Apure State, Venezuela. Stomach contents analyses, supported by laboratory determinations of digestion rate, showed that these fish are primarily diurnal carnivores. Predat
Authors
L.G. Nico

Distribucion y abundancia del manati, Trichechus manatus, en Venezuela

Abstract not supplied at this time
Authors
M. Correa-Viana, T. J. O'Shea, M.E. Ludlow, J.G. Robinson

How the Florida manatees fare today

Abstract not supplied at this time
Authors
R. K. Bonde, C.A. Beck

An evaluation of bone growth- layer counts as an age-determination technique in Florida manatees

Abstract not supplied at this time
Authors
M. Marmontel, T. J. O'Shea, S.R. Humphrey

South Florida rockland

Abstract not supplied at this time
Authors
J.R. Snyder, Alan Herndon, W.B. Robertson

Mercury accumulation in yellow perch in Wisconsin seepage lakes: Relation to lake characteristics

We studied relations between lacustrine characteristics and the total mercury (Hg) content of calendar age-2 yellow perch (Perca flavescens) in 10 seepage lakes in north-central Wisconsin. Mean concentrations and burdens (masses) of Hg in whole perch varied widely among lakes, were negatively correlated with lake pH and were positively correlated with total Hg concentration in surficial profundal
Authors
W.G. Cope, J.G. Wiener, R.G. Rada