Olaf Ellers, Research Associate in Biology and Mathematics

olaf ellers oregon beacholaf at computer in japan

Education

B.Sc.. University of Toronto, Toronto, Ontario, Canada 1983
Ph.D. Duke University, Durham, N. Carolina, USA, 1988

Research Areas

Biomechanics, functional morphology and ecophysiology of marine invertebrates and algae; mechanisms and modeling of growth and aquaculture in sea urchins, scaling of metabolic rate, effects of temperature on growth, underwater walking, and catch connective tissue in echinoderms.

Links

Academic Spotlight: Coastal Studies Span Walking Crabs and Artful Tourists

Summer Research at Bowdoin: Researchers Develop 'Bar Code' for Sea Urchins

Academic Spotlight: Bowdoin Researchers Seek Methods to Spur Sea Urchin Growth

Peer-reviewed Publications
(*indicates Bowdoin student co-author)

Johnson A.S., Salyers J.M.*, Alcorn N.J.*, Ellers O., Allen J.D. (2013) Externally visible fluorochrome marks and allometries of growing sea urchins.  Invertebrate Biology. 132:251-269.

Pfister, A.*, Johnson, A., Ellers, O., Horch, H.W. (2013) Quantification of dendritic and axonal growth after injury to the auditory system of the adult cricket Gryllus bimaculatus. Front. Physio. 3:367. doi: 10.3389/fphys.2012.00367 (online research article, 861 views: http://journal.frontiersin.org/Journal/10.3389/fphys.2012.00367/full)

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.  Link to abstract

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.  Link to pdf

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.  Link to pdf

Ellers, O. (2001) Size matters.  Book Review of Scaling in Biology, J.H. Brown and G.B. West eds. Oxford Univ. Press.  Complexity 6(4): 23-26.  Link to issue

Ellers, O. (2000) Orientation to, and acoustic detection of, beach waves during swash-riding and migration of donacid clams and other sandy beach invertebrates.  Pp. 177-194, In Biomechanics and Behaviour, P. Domenici & B. Blake (eds.).  publ. BIOS., Oxford. Link to book description

Hui, C.A., Ellers, O. (1999) Effect of high aluminum consumption on mechanics and composition of furculae of free-ranging coots.  Environmental Toxicology and Chemistry 18:  970-975.  Link to abstract

Ellers, O., Johnson, A.S., Moberg, P. (1998) Sutural strengthening of urchin skeletons by collagenous sutural ligaments. Biological Bulletin 195: 136-144.  Link to abstract

Ellers, O.  (1998)  Swash-riding in the clam, Donax variabilis.  McGraw-Hill 1998 Yearbook of Science and Technology, 31- 32. Link to book

Telford, M.,  Ellers, O. (1998)  The moving teeth of echinoids.  Pp.  843-848, In Echinoderms: San Francisco, R. Mooi and M. Telford (eds.).  publ.  Balkema, Rotterdam.

Telford, M., Ellers, O. (1997) Tooth advancement muscles in the sand dollar, Echinarachnius parma.  Invertebrate Biology 116: 255-261. Link to abstract

Ellers, O., Telford, M. (1997) Muscles advance the teeth in sand dollars and other sea urchins.  Proc. R. Soc. Lond. B  264: 1525-1530. Link to abstract

Ellers, O. (1997)  Book Review of Echinoderm Studies 5,. M. Jangoux and J.M. Lawrence, eds., A.A. Balkema, publ.  The Quarterly Review of Biology 72(3): 340.

Ellers, O., Telford, M. (1996)  Advancement mechanics of growing teeth in sand dollars (Echinodermata, Echinoidea):  a role for mutable collagenous tissue.  Proc. R. Soc. Lond. B  263: 39-44.  Link to abstract

Irschick, D. J., Austin, C. C., Petren, K., Fisher, Losos, J.B., Ellers, O. (1996)  A comparative analysis of clinging ability among pad-bearing lizards.  Biological Journal of the Linnean Society  59:  21-35.  Link to abstract

Ellers, O. (1995) Behavioral control of swash-riding in the clam Donax variabilisBiol. Bull.  189:  120-127.  Link to pdf

Ellers, O. (1995) Discrimination among wave-generated sounds by a swash-riding clam.  Biol. Bull.  189: 128-137.  Link to pdf

Ellers, O.  (1995) Form and motion of Donax variabilis in flow.  Biol. Bull.  189:  138-147.  Link to pdf

Lelievre, B., Telford, M. , Ellers, O. (1995) The role of collagen in reacting axial forces in the teeth of sand dollars (Echinoidea: Clypeasteroida).  Fourth European Echinoderms Conference, London 

Ellers, O. (1993)  A mechanical model of growth in regular sea urchins:  predictions of shape and a developmental morphospace.  Proc. R. Soc. Lond. B 254: 123-129.  Link to abstract

Moore, A.M.F. , Ellers, O. (1993)  A functional morphospace, based on dimensionless numbers, for a circumferential calcite stabilizing structure in sand dollars. J. Theor. Biol. 162: 253-266.  Link to abstract

Ellers, O., Telford, M. (1992) Causes and consequences of fluctuating coelomic pressure in sea urchins. Biol. Bull., 182: 424-434.  Link to pdf

Ellers, O., Telford, M. (1991) Forces generated by the jaws of clypeasteroids (Echinodermata:  Echinoidea). J. exp. Biol., 155: 585-603.  Link to pdf

Ellers, O. (1987) Passive orientation of benthic animals in flow. In W. F. Herrnkind & A. B. Thistle (Eds.), Signposts in the Sea, Proceedings of a multidisciplinary workshop on marine animal orientation and migration,  (pp. 45-68). Tallahassee: Dept. of Biological Science, Florida State University.

Telford, M., Mooi, R. , Ellers, O. (1985) A new model of podial deposit feeding in the sand dollar, Mellita quinquiesperforata (Leske):  The sieve hypothesis challenged. Biol. Bull., 169: 431-448.    Link to pdf

Ellers, O., Telford, M. (1984) Collection of food by oral surface podia in the sand dollar, Echinarachnius parma (Lamarck). Biol. Bull., 166: 574-582.  Link to pdf

Contributions to Book Chapters 
(*indicates Bowdoin student co-author)

Horch, HW, *Pfister A, Ellers O, Johnson AS (submitted) Plasticity in the cricket central nervous system.  Chapter 8 In: Cricket as a Model Organism:  Development, Regeneration, and Behavior.  Eds:  Ohuchi, H, Noji, S, Horch, HW, Mito, T, Popadim, A, Springer (New York, Heidelberg).

Published or Printed Abstracts (since 2005)
(*indicates Bowdoin student co-author)

Suchyta, KJ*, Goroff, MS*, Dickinson, ES*, Harmon, K*, Johnson, AS, Ellers, O, Dickinson, PS (2016) Mechanisms of stretch feedback and interactions with neuromodulators in the cardiac ganglion of the American lobster. Integrative and Comparative Biology (2016) (published abstract).

Dickinson PS, Dickinson ES*, Harmon KE*, Qu X*, Johnson AS, Ellers O. (2015) Mechanisms of sensory feedback and interactions with neuromodulators in a rhythmic pattern generator. March 2015, Boston, MA, Experimental Biology, Poster #841.4.

Horch HW, Saidenbert L*, Chong M*, Fiorillo B*, Vergara-Benitex J*, Zhand A*, Pfister A*, Ellers O, Johnson A(2014).  Exploration of two different compensatory strategies for recovery from injury in the adult cricket CNS.  Neuroscience Annual Meeting, Nov 15-19, Wash DC.

Harmon K*, Chin-Purcell M*, Dickinson ES*, Hartley TM*, Ellers O, Johnson AS, Dickinson, PS  (2014).  Mechanisms and effects of stretch feedback in the heart of the American lobster, Homarus americanus.  Neuroscience Annual Meeting, Nov 15-19, Wash DC.

Ellers O, Johnson AS, Guttenplan K*, Motokawa T (2014) The bounce in a seastar's step: classifying gaits in underwater legged locomotion  Integrative and Comparative Biology (2014) 54 (suppl 1): e59 doi: 10.1093/icb/icu/008 (published abstract).

Dickinson E*, Johnson AS, Ellers O; Dickinson PS (2014). Cardiac muscle in Homarus americanus responds differently to loading in transverse and longitudinal directions. Integrative and Comparative Biology (2014) 54(suppl 1): e59 doi:10.1093/icb/icu008

Ellers O, Johnson AS, Guttenplan K*, Motokawa T (2013) Does the starfish Protoreaster nodosus use a pendular gait while walking underwater? Japan Zool. Soc. Symp., Tokyo Inst. of Tech. Mar 16, 2013

Horch HW, Johnson A, Ellers O, Berry K*, Low I*, Sangal R*, Pfister A* (2012).  Sexually dimorphic dendritic responses to deafferentation and the potential role of semaphorins. Society for Neuroscience Abstracts Volume: 42

Askins, M.*, Lonati, G.,* Guttenplan, K.,* Fahey, A.,* Johnson, A.S., Ellers, O. (2012) Externally visible polyfluorochrome marking of urchins: growth comparisons between lab-reared and tidepool urchins.  Integrative and Comparative Biology, Poster Presentation, Annual Meeting Abstract, Jan. 3-7, 2012 Charleston, NC

Ellers, O., Yoshimura, K., Motokawa, T., Johnson, A.S. (2010) Why not walk faster, underwater?. Integrative and Comparative Biology, Annual Meeting Abstract, Jan. 3-7, 2010 Seattle, WA

Johnson, A.S., Ellers O. (2010).  Precise measurement of growth using multiple fluorochrome markers, the cubed root of weight and a new growth function. Integrative and Comparative Biology, Annual Meeting Abstract, Jan. 3-7, 2010 Seattle, WA

Brasili, A.*; Johnson, A.S.; Ellers, O. (2010) Temperature and size-dependent growth in a marine ectotherm: the green sea urchin Strongylocentrotus droebachiensis. Integrative and Comparative Biology, Annual Meeting Abstract, Jan. 3-7, 2010 Seattle, WA

Norton*, E; Ellers, O; Johnson, A.S. (2010) Testing an inverted pendulum model for underwater walking in the crab Carcinus maenus. Integrative and Comparative Biology, Annual Meeting Abstract, Jan. 3-7, 2010 Seattle, WA

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

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:

My kids, dogs, cats, music, reading, walking, piano, skiing, gymnastics