The Molluscs of Pigeon Creek, San Salvador, Bahamas

This barracuda coasts above the corals at Molasses Reef, Key Largo, Florida.

R. Hays Cummins, Western Program

Miami University

It is 12:16:21 PM on Tuesday, November 21, 2017. This page has served 52249 mollusc lovers and was last updated on Friday, May 2, 2014.


Paper:

Cummins, R.H., M.R. Boardman and A.I. Miller. 1995. The recognition of environmental transitions using species composition, biomass estimates, and taphonomic signatures in a Holocene carbonate lagoon, Pigeon Creek, San Salvador, Bahamas. Proceedings of the 7th Symposium on the Geology of the Bahamas. 10 pages

Rationale:

One goal of our study was to use dead molluscs to better recognize environmental transitions as preserved in the sediment record. There are a surprising variety of molluscs found in the death assemblage of Pigeon Creek. The types of dead molluscs seems to be at least partially determined by the amount of living seagrass present on the seafloor. For a glimpse of some of the results of a recent study, look at the relative abundances of the overall molluscan death assemblage at Pigeon Creek as shown in the table below. Compare the overall molluscan abundance in Pigeon Creek with the Relative Abundances and Biomass Dominants from the different environments within this diverse ecosystem. For a more complete overview of the objectives, methods, and results of our study, please see the paper referenced above.

We examined the molluscan death assemblage from 34 core samples from a variety of environments in the southern arm of Pigeon Creek located at the SE corner of San Salvador island. I have included a Detailed Map of San Salvador.

This detailed map illustrates our specific study area in Pigeon Creek.The solid black circles refer to sampling locations. The Seagrass Coefficient is delineated by color.


Some Representative Molluscs from the Tropical Lagoons of San Salvador
 

Caecum sp.

 

Cerithium variable

 

Unknown Lucinid

 

Chione cancellata

 

Tricolia affinis

 

Lucina penslyvanica


 

Total Molluscan Relative Abundance in the Southern Branch of Pigeon Creek

Species Numerical Abundance Relative Abundance (%)
Cerithium eburneum 2525 25.60
Codakia orbiculata 1029 10.40
Cerithium variable 785 7.94
Tellina sp. 662 6.70
Divaricella quadrisulcata 505 5.10
Cerithium literatum 465 4.71
Trigoniocardia antillarum 441 4.60
Lucina pensylvanica 405 4.10
Modulus carchedonius 395 4.00
Bulla striata 356 3.60
Acmaea pustulata 281 2.84
Tegula fasciata 167 1.69
Semele nuculoides 151 1.53
Tricolia affinis 147 1.49
Chione cancellata 131 1.33
Cerithidea scalariformis 115 1.16
Anomalocardia brasiliana 112 1.13
Rissoina cancellata 103 1.04
Nassarius albus 91 0.92
Smaragdia viridis viridemaris 86 0.87
Turbo castaneus 86 0.87
Polinices lacteus 86 0.87
Anachis sparsa 75 0.76
Brachidontes exustus 58 0.59
Bailya parva 57 0.58
Codakia costata 56 0.56
Olivella floralia 44 0.45
Vermicularia spirata 35 0.35
Barbatia cancellaria 33 0.33
Crenella divaricata 31 0.31
Retusa sulcata 29 0.29
Haminoea succinea 20 0.21
Pinctada radiata 21 0.21
Dentalium sp. 18 0.18
Arcopsis adamsi 18 0.18
Columbella mercatoria 17 0.17


Relative Abundance of Molluscs as a Function of Seagrass Cover & Bottom Type

(Click on the Image to download a Crisper, Larger View)


Molluscan Biomass Dominants as a Function of Seagrass Cover & Bottom Type

(Click on the Image to download a Crisper, Larger View)


A look at the tidal Range & Current Velocity in the "Blow-Out" area near the mouth of Pigeon Creek.

Some typical molluscs found in the seagrass beds of San Salvador.


Bivalve and Gastropod Morphology

These figures are from Jean Andrews 1971 publication Seashells of the Texas Coast, # 5, The Elma Dill Russel Spencer Foundation Series, University of Texas Press, Austin.

Click on an Image for a Larger View!
 

Bivalve Geography!

Typical Gastropod Shapes

Typical Bivalve Shapes

Typical Molluscan Benthic Epi- and In-fauna

Molluscs are Cool!
 

Gastropod Geography

Pigeon Creek Mangrove Quicktime Movies

You'll need Apple's quicktime to view these movies.

Mangroves are wonderful ecosystems found throughout the worlds tropical coastlines. The plants themselves are not closely related to one another. Rather, they have evolved to inhabit the same stressful environments--they are incredibly important estaurine nursery grounds. Hosts to incredible biomass, they are where I take my students for their first snorkel.

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