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Haley, N., J. Boreman, and M. Bain. 1996. Juvenile Sturgeon Habitat Use in the Hudson River. Pp. 1-18 in Final Reports of the Tibor T. Polgar FellowshipProgram. Hudson River Foundation, NewYork. Misho Borissov Dr. Lin’s Seminar 475 For Monday of April. Background (continued).

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slide1
Haley, N., J. Boreman, and M. Bain. 1996. Juvenile Sturgeon Habitat Use in the Hudson River. Pp. 1-18 in Final Reports of the Tibor T. Polgar FellowshipProgram. Hudson River Foundation, NewYork.Misho BorissovDr. Lin’s Seminar 475For Monday of April
background continued
Background (continued)
  • Oligohaline – intermediate freshwater/saltwater zone
  • Mesohaline – saltwater region
historical background
Historical Background
  • Atlantic Sturgeon
      • Acipenser oxyrinchus
  • Short-nose Sturgeon
      • Acipenser brevirostrum
  • Hudson River
      • History of the Hudson River
experimental background
Experimental Background
  • Tappan Zee Bridge

To Staatsburg, New York

  • Four Strata used
    • Wide Estuary
    • Highland Gorge
    • Wide River
    • Narrow River
additional background
Additional Background
  • Wide Estuary
    • Widest Section of the estuary. Channel of uniform depth
  • Highlands Gorge
    • Narrowest and Deepest section of the estuary.
  • Wide River
    • Widest, freshwater portion of the estuary.
  • Narrow River
    • Region consists of a straight, featureless channel. Channel and river width are nearly equal with very narrow subtidal banks along the shoreline.
experimental background continued
Experimental Background(continued)
  • Nets placed @ each stratum
      • Three small nets in hopes of capturing juvenile sturgeon
  • Juvenile terms
    • Atlantic sturgeon
          • Less than 1200 mm
    • Short-nose sturgeon
          • Less than 510 mm
results gathered
Results gathered
  • 57 Juvenile Sturgeon caught
      • 36 wild Atlantic sturgeon
      • 12 Short-nose juvenile sturgeon
      • 09 Stocked Atlantic sturgeon
results continued
Results(continued)
          • Total Length (mm) Weight (g)
          • Range Range
  • Short nose 404-584 300-1200
  • Atlantic 272-1245 80-4940
  • Stocked 306-659 120-2030
sturgeon distribution
Sturgeon Distribution
  • Distribution amongst the four strata
      • Atlantic sturgeon - Distributed along all four strata
      • Short-nose sturgeon- distributed along all four strata.
      • Stocked sturgeon – found only in the Wide River and the Narrow River strata
other experiments within this result
Other experiments within this result
  • Wild Atlantic sturgeon with a length of less than 600 mm was used.
      • Scientists did because of the wide range of distribution between sturgeon
        • They compared the distribution of an Atlantic Sturgeon less than 600 mm with the distribution of the Short-nose and Stocked sturgeon.
salinity
Salinity
  • Saltiness measured with YSI model 5500 Salinity meter.
    • Short-nose Sturgeon
        • Found mostly in freshwater
    • Atlantic Sturgeon
        • Found mostly in salt water
    • Stocked Sturgeon
        • Found in three zones
          • Found in salty, sweet, and intermediate zones
salinity graph 2
Salinity Graph # 2
  • Wild Atlantic Sturgeon
  • Different salinity and
  • temperature measure-
  • ments in HG to see if
  • seasonally-variable
  • characteristics are a factor
  • in surgeon distribution
  • and occurrence

By following the red line

At each strata, one would

Notice that salinity levels

Stayed nearly constant

Throughout the summer

salinity conclusion all three exhibited different distributions in terms of the salinity level
Salinity conclusion – All three exhibited different distributions in terms of the salinity level.
  • Distribution according to saltiness
    • Short-nose Sturgeon
      • As reported, short-nose sturgeons were found primarily in the freshwater region
    • Atlantic Sturgeon
      • These were found primarily in the saltwater region
    • Stocked Sturgeon
      • These were found in the intermediate zones
silt sand gravel
Silt, Sand, & Gravel
  • Silt
      • Rock and Soil
  • Sand
  • Gravel
      • Stone and Sand
silt sand gravel19
Silt, Sand, & Gravel

SUBSTRATE % of Effort SNS AS SS

silt 80.4 11 34 9

sand 17.4 1 2 0

gravel 2.3 0 0 0

significance 1.03 4.61 2.20

depth and temperature
Depth and Temperature
  • Temperature and Depth Measurement
      • Measured with YSI Model 5500 Temperature meter and depth

Depth Temp. (July) Temp (Aug)

Short-nose 17.3 24.2 27.5

Atlantic 22.8 27 26.6

Stocked 16.6 (around)26 26.9

frequency of occurrence
Frequency of Occurrence
  • Sampled Depths to see in which range the sturgeon would appear.
        • Different depths were taken into consideration as well as which sturgeon was caught in that respective depth
depth frequency graph
Depth Frequency Graph

SHORT NOSE ~~>

WILD ATLANTIC ~~>

STOCKED ATLANTIC ~~>

finale
Finale
  • The Wild Atlantic Sturgeon were primarily in the Highlands Gorge stratum (deep salty region)
  • The Short nose Sturgeon were primarily found in the Narrow River stratum (freshwater zone)
  • In saltier regions, AS outnumber SNS by 10:1, while in freshwater regions, that ratio is reversed, thus concluding that freshwater/saltwater boundary may serve as an ecological barrier between these two species.
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