51813_Sturgeon biodioversity an.PDF

The protracted period of Atlantic sturgeonemigra-
tion (4 years) indicatesthat the twospeciesoverlap
considerably in space,rood, andhabitat.Also, the
pattern ofemigration in conjunctionwithcompara-
bility in size andhabitsbetween thespecies suggests

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thatco-exploitation ofspace and foodresources
may be important in the migratory behavior of juve-
nileAtlantic sturgeon.
The apparentlyextensive co-occurrence of the
two sturgeons in the HudsonRiverestuaryhas not
beenclearly identified inpreviousinvestigations on
the Hudson River. Althoughsturgeonbiologists
working o n theHudsonRiverundoubtedly cap-
turedbothspecies simultaneously intheirwork,
analyses andreportshavealways beenoriented to a
single-species. This review is the First to simultane-

geons in theHudsonRiver. Theconclusionthat the

Buckley, J. & B. Kynard 1981. spawning and rearing of shortnose

ouslyreportdetails of thelifehistory ofbothstur-

t w o specics are not spatiallysegregated forlarge

parts oftheirlifehistories indicatesthat the Hudson

Riverestuary may beuniquewithin thejoint ranges

ofthe two species.

Acknowledgements

I thank William E. Bemisfor his strong encourage-

ment and confidencethatmotivated thewriting of

this paper. I also thank Vadim J. Birstein, Robert H.

Boyle, andJohnWaldman for organizing theInter-

nationalConference on SturgeonBiodiversity and

Conservation,where afirstversion ofthispaper

was presented.William E .Bemis, Vadim J.Birstein,

and John Waldman deserve muchcredit forwork-

ing with theauthors andpapersincluded in thisvol-

ume. Thiswork is acontribution fromresearch

sponsored by the HudsonRiver Foundationwith

supplemental supportprovided by theU. S. Army

Corps of Engineers. JeremyKnight,JohnWald-

man, AndyKahnle, SteveNack, and NancyHaley

reviewed an earlyversion of themanuscript, and

providedconstructive comments andsuggestions

for improvement.