In addition to the species listed below, a number of other organisms were occasionally found on the tires but were not counted. These include the nudibranchs Phidiana crassicornis, Doridella steinbergae and Flabellina sp.; the goose barnacle Pollicipes polymerus; the decorator crab Oregonia gracilis; the Cancer crab C. oregonensis; the green sea urchin Strogylocentrotus droebachiensis; the sea cucumber Eupentacta quinquesemita; the solitary ascidian Styela montereyensis; and innumerable tiny arthropods.
Key:
+
: species was present but not counted
++ : species was extremely abundant but not counted
NS : not significantly different
Inside
|
Tires |
Outside
|
Tires | Inside | Outside | paired | |||||||
Organism | 1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 | Average | Average | t-test |
Ph. Porifera (sponges) | |||||||||||||
Halichondria bowerbanki | + | + | + | + | + | + | + | + | + | + | + | + | |
Scypha | 1 | 4 | 2 | 3 | 0 | 0 | + | 0 | 0 | 0 | |||
Ph. Cnidaria (hydrozoans, anemones) | |||||||||||||
Garveia annulata | ++ | + | |||||||||||
Plumularia setacea | + | ++ | ++ | ++ | + | + | + | ||||||
Other Hydroids | + | + | + | + | + | ||||||||
Metridium senile | 13 | 28 | 55 | 65 | 28 | 5 | 2 | 4 | 15 | 20 | 37.8 | 9.2 | p < 0.05 |
Urticina spp. | 0 | 1 | 4 | 0 | 0 | 4 | 3 | 1 | 2 | 2 | 1 | 2.4 | NS |
Cl. Polychaeta (segmented worms) | |||||||||||||
Serpulidae | 5 | 8 | 7 | 16 | 8 | 2 | 0 | 0 | 1 | 2 | 8.8 | 1 | p < 0.05 |
Sabellidae | 0 | 4 | 13 | 20 | 12 | 7 | 6 | 7 | 2 | 20 | 9.8 | 8.4 | NS |
Spirorbidae | + | + | + | + | + | + | + | ||||||
Ph. Mollusca | |||||||||||||
Tonicella lineata (chiton) | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 2 | 1 | 0 | 0.4 | 1 | NS |
Collisella pelta (limpet) | 5 | 0 | 0 | 1 | 0 | 21 | 12 | 7 | 1 | 3 | 1.2 | 8.8 | p < 0.1 |
Mytilus edulis (mussel) | 1 | 0 | 0 | 0 | 0 | 34 | 10 | 7 | 16 | 10 | 0.2 | 15.4 | p < 0.05 |
Ph. Bryozoa | |||||||||||||
Bugula californica | + | + | + | + | + | ||||||||
Bugula pacifica | + | + | + | + | |||||||||
Dendrobeania lichenoides | ++ | + | + | + | ++ | + | + | ++ | + | + | + | + | |
Membranipora membranacea | ++ | + | + | + | + | + | ++ | + | |||||
Scrupucellaria | + | + | + | + | + | ||||||||
Encrusting bryozoans | + | + | + | + | + | + | |||||||
Cl. Cirripedia (barnacles) | |||||||||||||
Balanus nubilis | 9 | 14 | 13 | 4 | 27 | 45 | 34 | 56 | 17 | 18 | 13.4 | 34 | p < 0.1 |
B. glandula + B. crenatus | 33 | 75 | 74 | 105 | 11 | 61 | 86 | 79 | 22 | 91 | 59.6 | 67.8 | NS |
Cl. Ascidiacea (tunicates/sea squirts) | |||||||||||||
Chelyosoma productum | 23 | 47 | 35 | 52 | 20 | 2 | 6 | 9 | 7 | 8 | 35.4 | 6.4 | p < 0.01 |
Boltenia villosa | 1 | 2 | 0 | 8 | 0 | 0 | 6 | 3 | 1 | 2 | 2.2 | 2.4 | NS |
Distaplia occidentalis | 86 | 113 | 95 | 150 | 138 | 41 | 42 | 80 | 15 | 61 | 116.4 | 47.8 | p < 0.05 |
Aplidium spp. | 0 | 0 | 5 | 2 | 2 | 1 | 2 | 8 | 2 | 2 | 1.8 | 3 | NS |
Corella willmeriana | 0 | 1 | 5 | 0 | 2 | 0 | 0 | 0 | 0 | 0 | 1.6 | 0 | NS |
Algae | |||||||||||||
Mastocarpus papillatus | + | + | + | + | + | + | |||||||
Ulva fenestrata | + | + | + | + | + | + | + | + | + | ||||
Laminaria saccharina | + | + | + | + | + | + | |||||||
Callophyllis edentata | ++ | + | + | + | + | + | + | + | + | ||||
Desmarestia viridis | + | + | + | + | + | + | + | ||||||
Membranoptera platyphylla | + | + | + | + | + | + | ++ | ++ | ++ | + | + | ||
Alaria marginata | + | + | ++ | + | + | ++ | + | ||||||
Porphyra sp. | + | + | + | + | + | + | + | ||||||
Iridaea cordata | + | + | + |