Amy S. Johnson
Spring 2009
- Biological Principles II (BIO 102)
- Biomechanics (BIO 254)
- ADVANCED INDEPENDENT STUDY (BIO 402)
| Phone | (207) 725-3026 |
| Title | James R. and Helen Lee Billingsley Professor of Marine Biology |
| Department | BIOLOGY |
| Work Location | 130C Druckenmiller Hall |
| ajohnson@bowdoin.edu |
Education
B.A. Biology, University of California, Los Angeles, 1978
Ph.D. Zoology, University of California, Berkeley, 1986
Teaching Area
Introductory Biology, Biology of Marine Organisms, Biomechanics, Evolution of Marine Invertebrates
Field of Active Research Interest and Activity
Biomechanics, functional morphology and ecophysiology of marine invertebrates and algae; mechanisms and modeling of growth and aquaculture in sea urchins, scaling of metabolic rate.
Links
Academic Spotlight: Bowdoin Researchers Seek Methods to Spur Sea Urchin Growth
Summer Research at Bowdoin: Researchers Develop 'Bar Code' for Sea Urchins
Campus News: Professors Raise Awareness, Aspirations of Women in Scienc
Peer-reviewed Publications
(*indicates Bowdoin student co-author)
Ellers, O., Johnson, A.S. (2009) Polyfluorochrome marking slows growth only during the marking month in the green sea urchin Strongylocentrotus droebachiensis. Invert. Biol. DOI:10.1111/j.1744-7410.2008.00159.x.
*Selden, R., Johnson, A.S., Ellers, O. (2009) Crab scent induces thicker skeletons, smaller gonads and size-specific growth responses in sea urchins. Mar. Biol. 156:1057–1071 DOI : 10.1007/s00227-009-1150-0 pdf
*Butler, M., Johnson, A.S. (2004). Are melanized feather barbs stronger? J. Exp. Biol. 207: 285-293
*Lohrmann NL, Logan BA, Johnson AS (2004) Seasonal acclimatization of antioxidants in Chondrus crispus and Mastocarpus stellatus, two co-occurring red algae with differing winter tolerances. Biol Bull 2004 207: 225-232.
Johnson, A.S., Ellers, O., *Lemire, J., *Minor, M., *Leddy, H. (2002). Sutural loosening and skeletal flexibility during growth: determination of drop-like shapes in sea urchins. Proc. R. Soc. Lond. B, 269: 215-220.
*Pratt, M.P., Johnson, A.S. (2002). Strength, Drag, and Dislodgement of Two Competing Intertidal Algae from Two Wave Exposures and Four Seasons. J. Exp. Mar. Biol. Ecol. 272: 71-101
Johnson, A.S. (2001). Drag, drafting, and mechanical interactions in canopies of the red alga Chondrus crispus. Biological Bulletin 201: 126-135.
*Leddy, H.A., Johnson, A.S. (2000). Walking vs. breathing: mechanical differentiation of sea urchin podia corresponds to functional specialization. Biological Bulletin 198: 88-93.
Ellers, O, Johnson, A.S., Moberg, P. (1998). Sutural strengthening of urchin skeletons by collagenous sutural ligaments. Biological Bulletin 195: 136-144.
Johnson, A. (1997). Flow is genet and ramet blind: Consequences of individual, group and colony morphology on filter feeding and flow. Proceedings of the 8th International Coral Reef Symposium 2: 1093-1096.
Johnson, A.S. and Koehl, M.A.R. (1994). Maintenance of environmental stress factor in different flow habitats: Thallus allometry and material properties of a giant kelp. Journal of Experimental Biology 195: 381-410.
Johnson, A.S. (1993). Sag-mediated modulated tension in terebellid tentacles exposed to flow. Biological Bulletin 185: 10-19.
Johnson, A.S. and K.P. Sebens (1993). Consequences of a flattened morphology: Effects of flow on feeding rates of the scleractinian coral Meandrina meandrites (Linnaeus 1758). Marine Ecology Progress Series 99: 99-114.
*Trussell, G.C., A.S. Johnson, S.G. Rudolph, and E.S. Gilfillan (1993). Resistance to dislodgment: Habitat and size-specific differences in morphology and tenacity in an intertidal snail. Mar. Ecol. Prog. Ser. 100: 135-144.
Dudgeon, S.R. and A.S. Johnson (1992). Thick versus thin: Thallus morphology and tissue mechanics influence differential drag and dislodgement of two co-dominant seaweeds. J. Exp. Mar. Biol. Ecol. 165: 23-43.
Sebens, K.P. and A.S. Johnson. (1991). The effect of water movement on prey capture by reef corals. Hydrobiologia 216/217: 247-248.
Sebens, K.P. and A.S. Johnson. (1991). Effects of water movement on prey capture and distribution of reef corals. Hydrobiologia 226: 91-101
Johnson, A.S. (1990). Flow around phoronids: Consequences of a neighbor to suspension feeders. Limnol. and Oceanogr. 35(6): 1395-1401.
Johnson, A.S. (1988). Hydrodynamic study of the functional morphology of the benthic suspension feeder, Phoronopsis viridis (Phoronida). Mar. Biol. 100: 117-126.
Published or Printed Abstracts
(since 2005; *indicates Bowdoin student co-author)
Ellers, O., Yoshimura, K., Motokawa, T., Johnson, A.S. (2009) An inverted pendulum model for underwater walking. Integrative and Comparative Biology, Annual Meeting Abstract 74.1, Jan. 3-7, 2009, Boston, MA
Johnson, A., Selden, R.*, Ellers, O. (2009) Crab scent induces thicker skeletons, smaller gonads and size-specific adjustments in growth rate in sea urchins. Integrative and Comparative Biology, Annual Meeting Abstract 74.1, Jan. 3-7, 2009, Boston, MA
Johnson, A.S., Ellers, O., Butler, M.* (2006). Barbs of a feather bend (and twist) together. Integr. Comp. Biol. 46(1): e70; doi:10.1093/icb/icl056
Lake, B.* Johnson, A.S. Mauck, R.A. (2006) Influence of orientation and flow speed on feeding behavior and metabolism of the barnacle Semibalanus balanoides. Integr. Comp. Biol. 46(1): e219; doi:10.1093/icb/icl056
Johnson, A.S., Ellers, O. (2006) A new fluorochrome-based identification tag for sea urchins for use in a hatchery and lease-site aquaculture. Northeast Aquaculture Conference and Exposition. Mystic, Connecticut. December, 2006.
Ellers, O., Johnson, A.S. (2006). Temperature determines size and time-to-size in urchins: calibration of size-temperature effects in marine ectotherms. International Echinoderm Conference, University of New Hampshire, August 2006.
Johnson, A.S., Ellers, O., *Wright, M., *Selden, R, *Stranges, B. (2006). Is there an oxygen-limited lag phase in early growth in sea urchins, Strongylocentrotus droebachiensis? International Echinoderm Conference, University of New Hampshire, August 2006.
Johnson, A.S., Ellers, O., *Wright, M., *Stranges, B. (2005). Implications of transport processes and 2/3 power metabolic scaling to Bertalanffy and bimodal growth in sea urchins. Integr. Comp. Biol. 44(6):709.
Other Interests:
Kids, dogs, cats, music, reading, walking, gymnastics, light flecks on new spring leaves, thimble moon on night of first frost, full moon setting at the edge of an autumn morning mist
A demipyramid ossicle (jaw bone) from the sea urchin Strongylocentrotus droebachiensis. The calcite ossicle was marked first with tetracycline and then with alizarin complexone. These fluorescent markers become incorporated into the growing edge of the ossicle. The marks are four days apart. Image by A. Johnson and O. Ellers. See: Ellers, O., Johnson, A.S. (2009) Polyfluorochrome marking slows growth only during the marking month in the green sea urchin Strongylocentrotus droebachiensis. Invert. Biol. DOI:10.1111/j.1744-7410.2008.00159.x.