Catalog Number: USNM 575560
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Isopropyl Alcohol
Collector(s): D. Jordan
Locality: Santa Barbara, California, United States, North Pacific Ocean
- Syntype: Verrill, A. 1883. Bull. Mus. Comp. Zool. 11(6): 121-123, pls. 5-6.
Water temperature and chemistry ranges based on 1 sample.
Depth range (m): 1 - 18
Temperature range (°C): 15.620 - 15.620
Nitrate (umol/L): 0.799 - 0.799
Salinity (PPS): 33.472 - 33.472
Oxygen (ml/l): 5.724 - 5.724
Phosphate (umol/l): 0.395 - 0.395
Silicate (umol/l): 2.474 - 2.474
Depth range (m): 1 - 18
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.
Octopus bimaculatus can be found in subtidal and intertidal communities in holes, under rocks, and in crevices. They have been observed to change shelters semi frequently anywhere from daily to after 5 months, but generally stay in the same area. They will leave and return to the same shelter. This could possibly mean that the gastropod and bivalve populations are more severely impacted near octopus shelters from continuously being preyed upon. Abundance of shelters has not shown to limit the population size of the two spotted octopus.
Known prey organisms
Based on studies in:
USA: California, Southern California (Marine)
This list may not be complete but is based on published studies.
- R. J. Rosenthal, W. D. Clarke, P. K. Dayton, Ecology and natural history of a stand of giant kelp, Macrocystis pyrifera, off Del Mar, California. Fish. Bull. (Dublin) 72(3):670-684, from p. 683 (1974).
effect on snails
It can severely diminish the local snail population through predation.
Octopus bimaculatus, the California two-spot octopus or Verrill's two-spot octopus, is an octopus common in the subtidal and intertidal zone of Southern California. It is often confused with the related species Octopus bimaculoides, and the common name "California two-spot octopus" is often applied to both species.
Most matings occur in May and June when water temperatures are rising, but they may mate throughout the year. Most females then lay their eggs between April and August.
- Ambrose, R. F. (1984). "Food preferences, prey availability, and diet of Octopus bimaculatus Verrill". Journal of Experimental Marine Biology and Ecology 77 (1–2): 29–44. doi:10.1016/0022-0981(84)90049-2.
- Ambrose, R. F. (1986). "Effects of octopus predation on motile invertebrates in a rocky subtidal community". Marine Ecology Progress Series 30: 261–273. doi:10.3354/meps030261.
- Ambrose, R. F. (1988). "Population dynamics of Octopus bimaculatus: Influence of life history patterns, synchronous reproduction and recruitment". Malacologia 29: 23–39.
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