relationships between tidal height and species abundances: implications for monitoring rocky shores...
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Relationships Between Tidal Height and Species Abundances: Implications for
Monitoring Rocky Shores
Steve MurrayCSU Fullerton
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Urban Influences
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-4
-3
-2
-1
0
1
2
3M
ean
Mon
thly
An
om
alies (
°C)
19501955 19651960 1970 1980 19901975 1985 1995
Warm Regime
Coastal Sea Temperature
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Urban Influences?Fishing Pressures?
Changing Sea Temperatures?Changing Sea Level?
Changes in Intertidal Communities
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Tides: Daily RegimeMixed Semi-diurnal Character
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Tides: Monthly PatternsNeap and Spring Tides
SPRING NEAP NEAP SPRING
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Tide Levels
Fee
tZero Datum = 0.0
ft
Highest of High Tides
= HHHW OR EHWS
Lowest of Low Tides
= LLLW OR ELWS
MTL or MSL (Mean Tide Level or Mean
Sea Level
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Source: Doty, M. S. 1946. Critical tide factors that are correlated with the vertical distribution of marine algae and other organisms along the Pacific Coast. Ecology 27: 315-328.
Zonation and Critical Tidal
Levels (Max Doty)
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Zonation
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Quadrat Sampling
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Line Point Contact Sampling
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Source: Littler, M. M. and S. N. Murray. 1975. Impact of sewage on the distribution, abundance, and community
structure of rocky intertidal macro-organisms. Mar. Biol. 30: 277-291.
Zonation Patterns Quantified
Tid
al H
eigh
t
Species
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Measuring Tidal Heights of Samples
Measuring RodLaser Target
Laser Level
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Calibrate Vertical Height on Shore with
Tidal Datum
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Acknowledgements
Field and Lab Assistance: Janine Kido, Teri Denis, Jayson Smith, Everett Yee, Susan Frisch, Sarah Henkel, Erin Cox, Lisa Gilbane, Aimee Bullard, Amanda Gerrard, Julie Bursek, Jill Moeller, Tiffany Luas, Nicolle, Panos, Alison Kendall, Megan Williams, Erin Maloney, Kristen Kusic, Haven Livingston