David L. Cowles, PhD
Professor of Biology
Walla Walla University
Courses I teach at Rosario:BIOL 458 Marine Biology
BIOL 460 Marine Ecology
BIOL 475 Marine Invertebrates
In summer 2002 the Marine Invertebrates class made a detailed comparison of the
intertidal community at Urchin Rocks, a heavily visited area,
in comparison with Northwest Island, a more isolated area.
To view the abstract from the report, click here
To download a copy of our report in Word Perfect format, click here for:
The abstract (7KB)
The main text and tables (126KB)
The figures (4 MB)
Appendices (the original data sets) (6 MB)
Onthank, Kirt L. and D.L. Cowles, 2011. Prey selection in Octopus rubescens: Possible roles of energy budgeting and prey nutritional composition. Marine Biology 158: pp 2795-2804
Helmstetler, Hans and D. L. Cowles, 2008. Population characteristics of native freshwater mussels in the mid-Columbia and Clearwater rivers, Washington State. Northwest Science 82:3 211-221
Cowles, D. L. and J. L. Hayward, 2008. Historical changes in the physical and vegetational characteristics of Protection Island, WA. Northwest Science 82:3 174-184
Cowles, David L., Jaclyn R. Van Dolson, Lisa R. Hainey, and Dallas M. Dick, 2006. The use of different eye regions in the mantis shrimp Hemisquilla californiensis (Crustacea: Stomatopoda) for detecting objects. J. Experimental Marine Biology and Ecology 330:2 pp 528-534.
Scarbrough, J.R., D. L. Cowles, and R. L. Carter, 2002. Microsatellites in shrimp species. pp. 291-299 in Elva Escobar-Briones and Fernando Alvarez, eds., Modern Approaches to the Study of Crustacea. Kluwer Academic Publishers, New York.
Cowles, D. L., 2001. Swimming speed and metabolic rate during routine swimming and simulated diel vertical migration of Sergestes similis in the laboratory. Pacific Science 55:3 215-226
Ma, Xiao Li, D. L. Cowles, and R. L. Carter, 2000. Effect of pollution on genetic diversity in the bay mussel Mytilus galloprovincialis and the acorn barnacle Balanus glandula. Marine Environmental Research 50 (2000): 559-563
Cowles, D. L., 1998. Biomass decline in forest fragments. Technical comment. Science 282: 1611a
Hayward, James L., Scott D. Folsom, David L. Elmendorf, Alex A. Tambrini, and David L. Cowles, 1997. Experiments on the Taphonomy of Vertebrate Eggs in Marine Environments. Palaios 12: 482-488.
Morgan, M. B. and D. L. Cowles, 1996. The effects of temperature on the behavior and Physiology of Phataria unifascialis Gray (Echinodermata, Asteroidea): Implications for the species' distribution in the Gulf of California, Mexico. Journal of Experimental Marine Biology and Ecology 208: 13-27
Cowles, D. L. and J. J. Childress, 1995. Aerobic metabolism of the anglerfish Melanocetus johnsoni, a deep-pelagic marine sit-and-wait predator. Deep-Sea Research 44:3 247-253
Cowles, D. L., 1994. Swimming dynamics of the mesopelagic vertically migrating penaeid shrimp Sergestes similis: Modes and speeds of swimming. J. Crustacean Biology 14:2 247-257
Cowles, D. L., J. J. Childress, and M. E. Wells, 1991. Respiratory rates and depths of occurrence of Hawaiian midwater crustaceans. Marine Biology 110: 75-83
Childress, J. J., D. L. Cowles, J. A. Favuzzi, and T. J. Mickel, 1990. Metabolic rates of deep-sea decapod crustaceans decline with increasing depth primarily due to the decline in temperature. Deep-Sea Research 37: 929-949
Childress, J. J., M. H. Price, J. Favuzzi, and D. L. Cowles, 1990. The chemical composition of midwater fishes as a function of depth of occurrence off the Hawaiian Islands: Food availability as a selective factor? Marine Biology 105:2 235-246
Cowles, D. L. and J. J. Childress, 1988. Swimming speed and oxygen consumption in the bathypelagic mysid Gnathophausia ingens. Biological Bulletin 175: 111-121
Cowles, D. L., J. J. Childress, and D. L. Gluck, 1986. New method reveals
unexpected relationship between velocity and drag in the bathypelagic crustacean
ingens. Deep-Sea Research 33:7 865-880
Posters and abstracts presented at scientific meetings:
Cowles, D.L., L. Cole, P. Crain, M. Hallock, and L. Ward, 2012. Between a rock and a silty place: Margaritifera falcata mussels and dams in the Elwha River. Invited talk at the freshwater mussel symposium, Society for Northwestern Vertebrate Biology, Hood River, OR
Helmstetler, H. and David L. Cowles, 2012. Population Characteristics of Native Freshwater Mussels in the mid-Columbia and Clearwater Rivers, Washington State - Hans Helmstetler. Invited talk at the freshwater mussel symposium, Society for Northwestern Vertebrate Biology, Hood River, OR
Cowles, J.M., N. Sullivan, D.L. Cowles, and G. Stone, 2011. Is the isopod Pentidotea resecata photosynthetic? Poster for Murdock Scientific Conference, Seattle, WA, November 2011
Cowles, D.L., Patrick Crain, Molly Hallock, Larry Ward, and Layla Cole, 2011. Update on the Elwha River Mussel Margaritifera falcata populations. Poster for Elwha River Science Symposium, Port Angeles, WA, September 2011.
Onthank, K.L. and D.L. Cowles, 2008. Energy budgeting in Octopus rubescens and its implications for prey choice and trophic ecology. Presentation for American Malacological Society Annual Meeting, Carbondale, Illinois
Ewing, T; Onthank, K L, and D. L. Cowles, 2008. The effect of octopus predation on a sponge-scallop association. Poster for ASLO Ocean Sciences meeting, Orlando, Florida
Onthank, K L and D. L. Cowles, 2008. Metabolic measurements of energy flow through Octopus rubescens. Poster for ASLO Ocean Sciences meeting, Orlando, Florida
Galusha, Joseph G., James L. Hayward, Shandelle M. Henson, and David L. Cowles, 2008. Recent changes in the reproductive success and numbers of glaucous-winged gulls (Larus glaucescens) breeding on Protection Island National Wildlife Refuge, Jefferson County, WA, USA. Presented at the Pacific Seabird Group meeting, Bellingham, WA
Tonn, D.L. and D. L. Cowles, 2006. Significance of individual metrics in habitat utilization by bull trout (Salvelinus confluentus) in the upper Touchet River system of eastern Washington. Abstract for presentation, ASLO summer meetings, Victoria, BC
Cowles, David L., 2006. A web-based system for identifying marine invertebrates of the Pacific Northwest: A tool for advanced students and the public. Abstract for poster, ASLO summer meetings, Victoria, BC
Tonn, Denise and David L. Cowles, 2006. Significance of individual metrics in habitat utilization by bull trout (Salvelinus confluentus) in the upper Touchet River system”. Oral presentation, Walla Walla Watershed Research, Monitoring, and Evaluation Conference, Walla Walla, WA
Hill, Bryan, Krysten Botimer, and David L. Cowles, 2004. Color effects on phototaxis in Triopha catalinae (Mollusca: Opisthobranchia). Poster presented at the Murdock research conference, Portland, OR
McFadden, Melissa M and David L. Cowles, 2004. Blood and Tissue Characteristics of Hemisquilla californiensis, a Burrow-Dwelling Mantis Shrimp which Routinely Encounters Hypoxia. Poster presented at ASLO Ocean Sciences Meeting, Honolulu, Hawaii.
Cowles, David L., 2004. Metabolic adaptations (and the lack thereof) to oxygen limitation in a burrow-dwelling crustacean. Poster presented at ASLO Ocean Sciences Meeting, Honolulu, Hawaii.
Van Dolson, Jaclyn, Dallas Dick, Lisa Hainey, and David L. Cowles, 2003. Behavioral Assays of the sensitivity of Hemisquilla californiensis eyes to different colors of light. Poster presented at Murdock Conference, Tacoma, WA
Scarbrough, J.R., J.F. Sands, D.L.Cowles, and R.L.Carter, (2000). Isolation and characterization of microsatellite loci in the mesopelagic shrimp Acanthephyra curtirostris (Caridea:Oplophoridae). Abstract for poster at The Crustacean Society Summer Meeting, Puerto Vallarta, Mexico.
Scarbrough, J.R., J.F. Sands, D.L.Cowles, and R.L.Carter, (2000). Microsatellite diversity in the mesopelagic shrimp Acanthephyra curtirostris (Caridea:Oplophoridae). Southern California Academy of Sciences Annual Meeting spring 2000
Cowles, D.L., Jason J. Cassista, Tamara L. Richter, and Leandra P. Peters, 1999. Hemisquilla ensigera californiensis (Stomatopoda: Gonodactylidae): How does this burrow-dwelling stomatopod manage to break all the rules? The Crustacean Society Summer Meeting, Lafayette, LA
Ma, Xiao Li, D. L. Cowles, and R.L. Carter, 1999. Effect of pollution on genetic diversity in the acorn barnacle Balanus glandula. Southern California Academy of Sciences Annual Meeting Apr 30, 1999
Ma, Xiao Li, D.L. Cowles, and R.L. Carter, 1999. Effect of pollution on genetic diversity in the bay mussel Mytilus galloprovincialis and the acorn barnacle Balanus glandula. PRIMO 10: Tenth International Symposium on Pollutant Responses in Marine Organisms. Williamsburg, VA Apr 25-29, 1999
Ma, Xiao Li, David L. Cowles, Ronald L. Carter, and S. A. Steinert, 1998. Effect of pollution on genetic diversity in the bay mussel Mytilus galloprovincialis. ASLO Ocean Sciences Meeting, San Diego Feb 9-13, 1998.
Cowles, D.L., 1997. Laboratory measurements of metabolism and swimming speed during routine swimming and vertical migration in Sergestes similis. Deep Sea Biology Symposium, Monterey, CA
Cowles, D.L., 1997. The effect of increasing salinity in the salton sea on the barnacle Balanus amphitrite, a dominant benthic resident of the sea. Southern California Environment and History Conference II; Northridge, CA
Cowles, D.L., 1997. Underwater upright logs in Lake Crescent, WA: Implications for interpreting fossil trees in putative growth position. Rosario Conference, Anacortes, WA
Cowles, D.L., 1997. Underwater upright logs in Lake Crescent, WA: Lessons for interpreting logs in the fossil record. BRISCO, Yakima, WA
Peterson, T., L. P. Peters, and D. L. Cowles, 1997. Behavioral and metabolic adaptations of Hemisquilla ensigera to hypoxia within the burrow. Abstract, ASLO Aquatic Sciences meeting, Santa Fe, NM.
Escamilla-Perez, Ana Lilia and David L. Cowles, 1995. Balanus amphitrite (Crustacea,Thoracica) in the Salton Sea: Effects of Increasing Salinity. Abstract, American Society of Limnology and Oceanography 1995 meeting, Reno, Nevada.
Cassista, J. J. and D. L. Cowles, 1994. Activity and metabolism of Hemisquilla ensigera (Crustacea:Stomatopoda) under hypoxic conditions. American Zoologist 34:5 p 105A.
Cowles, D. L., 1992. Swimming characteristics of the mesopelagic vertical migrator Sergestes similis (Decapoda: Sergestidae). Abstract, AAAS Pacific Division Meetings. Proceedings of the Pacific Division, AAAS 11:1 p 34
Morgan, M. B. and D. L. Cowles, 1990. Observations on the distribution and physiology of Phataria unifascialis (Echinodermata: Asteroidea): Temperature as a limiting factor? American Zoologist 30:4 p 131A.
Cowles, D. L., 1988. Respiration and body component analysis of the deep-sea benthopelagic holothuroid Scotoanassa sp in two different years. Eos 69:44 p 1126. Abstract, American Society of Limnology and Oceanography Winter Meeting.
Cowles, D. L., 1986. Metabolism of deep-living pelagic crustaceans in relation to depth of occurrence and environmental oxygen levels. Eos 67:44 p 971. Abstract, American Society of Limnology and Oceanography Winter Meeting
Cowles, D. L., 1985. An unusual relationship found between swimming
velocity and drag in negatively buoyant pelagic crustaceans. Poster, AAAS
Spring 1984 Western Meetings
Student Theses supervised:
Redberg, Simeon, 2012. Comparison of natural and anthropogenic effects on nearshore periphyton in Lake Crescent, Washington State. M.S. thesis, Walla Walla University.
Hersey, Lyndsi Renee, 2012. A search for introgression and gene flow among populations of three Pacific coast Anthopleura species. M.S. thesis, Walla Walla University.
Cole, Layla Renee, 2010. Population status of freshwater mussels in the Elwha river. M.S. thesis, Walla Walla University.
Hainey, Lisa Rachelle, 2008. Effects of photooxidative stress and algal growth rates on algal expulsion by the symbiotic sea anemone Anthopleura elegantissima. M.S. thesis, Walla Walla University.
Shelton, Tyler Scott James, 2008. Effects of low oxygen on behavior of the mantis shrimp Hemisquilla californiensis. M.S. thesis, Walla Walla University.
Onthank, Kirt L., 2008. Aerobic metabolism and dietary ecology of Octopus rubescens. M.S. thesis, Walla Walla University
Tonn, Denise L., 2007. Correlations of individual metrics of habitat quality with habitat utilization by bull trout (Salvelinus confluentus) in the upper Touchet River system in southeastern Washington. M.S. thesis, Walla Walla College
Helmstetler, Hans A., 2006. Population structure and pollutant levels of freshwater mussels in the mid-Columbia River. M.S. thesis, Walla Walla College
McFadden, Melissa A., 2004. Living without oxygen: The anaerobic metabolism of Hemisquilla californiensis M.S. thesis, Walla Walla College
Scarbrough, J. Russell, 2004. Potential diversity and genetic structure within the cosmopolitan mesopelagic zooplanktonic shrimp Acanthephyra curtirostris. Ph.D. dissertation, Loma Linda University
Ma, Xiao Li, (Ph.D. 1999). The effect of pollution on the genetic structure of populations of marine species. Ph.D. dissertation, Loma Linda University
Peterson, Tamara, (M.S. 1998). Ventilation behavior and mechanisms under hypoxic conditions of the mantis shrimp Hemisquilla ensigera californiensis (Stomatopoda: Hemisquillidae). M.S. Thesis, Loma Linda University
Peters, Leandra, (M.S.1997). Adaptations of Hemisquilla ensigera californiensis (Stomatopoda: Gonodactylidae) to burrow dwelling with particular emphasis on hypoxic conditions . M.S. Thesis, Loma Linda University
Cassista, Jason J. (M.S. 1995). The aerobic metabolism and behavior of the burrow-dwelling mantis shrimp Hemisquilla ensigera californiensis. M.S. Thesis, Loma Linda University
Escamilla-Perez, Ana (M.S. 1994). The effects of increasing salinity on the reproduction, feeding behavior, growth rate, osmoregulation and survival of the barnacle Balanus amphitrite (Crustacea, Thoracica) from the Salton Sea, California. M.S. Thesis, Loma Linda University
Morgan, Michael B. (M.A. 1992). The Effects of Temperature on
the physiology of Phataria unifascialis; and its implications for
the species' distribution in the Gulf of California. M.S. Thesis,
Loma Linda University