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Common Name Types of Shell Hermit Crabs Snails Total Shells Standard Deviation
Turban Snail Turbo fluctuosus 40 42 82 1.41
Marian's Top Snail Tegula mariana 30 35 65 3.54
Nerite Nerita funiculate 14 8 22 4.24
Angelic Tooth Snail Acanthina angelica 4 14 18 7.07
Speckled Cerith Cerithium maculosum 4 3 7 0.71
Fly-Speck Cerith Cerithium stercusmuscarum 5 0 5 3.54
Inflated Dove Columbella fuscata 2 0 2 1.41
Coraline Snail Morula ferruginosa 5 3 8 1.41
Anachis Costoanachis sp. 1 0 1 0.71
Pygmy Olive Olivella dama 0 0 0 0.00
Table 1. The observed number of hermit crabs and snail species collected by 3 people; each person collecting the first 35 hermit crabs, and the first 35 snail species found, collecting only the species from under rocks in the intertidal zone 2 of Station Beach at Puerto Penasco, Mexico.


Fig. 1. Each column is an average of the three samples of each species, hermit crabs and snails, collected by three people, collecting only the species from under rocks in the intertidal zone 2 of Station Beach at Puerto Penasco, Mexico. Averages are +/- 0.76 standard error.


Shell Use - Zone 2 Expected
Common Name Types of Shell Hermit Crabs Snails Total Shells Standard Deviation
Turban Snail Turbo fluctuosus 41 41 82 0.00
Marian's Top Snail Tegula mariana 32.5 32.5 65 0.00
Nerite Nerita funiculate 11 11 22 0.00
Angelic Tooth Snail Acanthina angelica 9 9 18 0.00
Speckled Cerith Cerithium maculosum 3.5 3.5 7 0.00
Fly-Speck Cerith Cerithium stercusmuscarum 2.5 2.5 5 0.00
Inflated Dove Columbella fuscata 1 1 2 0.00
Coraline Snail Morula ferruginosa 4 4 8 0.00
Anachis Costoanachis sp. 0.5 0.5 1 0.00
Pygmy Olive Olivella dama 0 0 0 0.00
Totals 105 105 210 Avg. = 0.00
Table 2. The expected number of hermit crabs and snail species to be collected by 3 people; each person collecting the first 35 hermit crabs, and the first 35 snail species found, collecting only the species from under rocks in the intertidal zone 2 of Station Beach at Puerto Penasco, Mexico.


Fig. 2. Each column is an expected average of the three samples of each species, hermit crabs and snails, collected by three people, collecting only the species from under rocks in the intertidal zone 2 of Station Beach at Puerto Penasco, Mexico. Averages are +/- 0.00 standard error.

Shell Use - Zone 3 Observed
Common Name Types of Shell Hermit Crabs Snails Total Shells Standard Deviation
Turban Snail Turbo fluctuosus 15 16 31 0.71
Marian's Top Snail Tegula mariana 17 31 48 9.90
Nerite Nerita funiculate 0 9 9 6.36
Angelic Tooth Snail Acanthina angelica 12 10 22 1.41
Speckled Cerith Cerithium maculosum 16 2 18 9.90
Fly-Speck Cerith Cerithium stercusmuscarum 5 7 12 1.41
Inflated Dove Columbella fuscata 2 0 2 1.41
Coraline Snail Morula ferruginosa 35 29 64 4.24
Anachis Costoanachis sp. 1 0 1 0.71
Pygmy Olive Olivella dama 2 1 3 0.71
Totals 105 105 210 Avg. = 3.6766955
Table 3. The observed number of hermit crabs and snail species collected by 3 people; each person collecting the first 35 hermit crabs, and the first 35 snail species found, collecting only the species from under rocks in the intertidal zone 3 of Station Beach at Puerto Penasco, Mexico.


Fig. 3. Each column is an average of the three samples of each species, hermit crabs and snails, collected by three people, collecting only the species from under rocks in the intertidal zone 3 of Station Beach at Puerto Penasco, Mexico. Averages are +/- 1.16 standard error.

Shell Use - Zone 3 Expected
Common Name Types of Shell Hermit Crabs Snails Total Shells Standard Deviation
Turban Snail Turbo fluctuosus 15.5 15.5 31 0.00
Marian's Top Snail Tegula mariana 24 24 48 0.00
Nerite Nerita funiculate 4.5 4.5 9 0.00
Angelic Tooth Snail Acanthina angelica 11 11 22 0.00
Speckled Cerith Cerithium maculosum 9 9 18 0.00
Fly-Speck Cerith Cerithium stercusmuscarum 6 6 12 0.00
Inflated Dove Columbella fuscata 1 1 2 0.00
Coraline Snail Morula ferruginosa 32 32 64 0.00
Anachis Costoanachis sp. 0.5 0.5 1 0.00
Pygmy Olive Olivella dama 1.5 1.5 3 0.00
Totals 105 105 210 Avg. = 0.00
Table 4. The expected number of hermit crabs and snail species to be collected by 3 people; each person collecting the first 35 hermit crabs, and the first 35 snail species found, collecting only the species from under rocks in the intertidal zone 3 of Station Beach at Puerto Penasco, Mexico.


Fig. 4. Each column is an expected average of the three samples of each species, hermit crabs and snails, collected by three people, collecting only the species from under rocks in the intertidal zone 3 of Station Beach at Puerto Penasco, Mexico. Averages are +/- 0.00 standard error.

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