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YorkPic Arne


Courses Taught at Anna Maria College

Human Anatomy and Physiology I/II (BIO212/213)
General Biology I (BIO103)
General Biology II (BIO104)
Genetics (BIO402)
Environmental Chemistry (CHM110)
Advanced Methods in Biology (BIO497)


Research Interests

1) Anadromous fish migrate from their natal streams out to the open ocean and then return as part of their natural life history. This movement between freshwater and seawater presents a physiological challenge for salt and water balance. My current research foci are on the cells and ion transport proteins that permit ion homeostasis in aquatic environments of different salinities.

2) The retina is a highly specialized tissue that is ordered into distinct functional lamellae which act in concert to convey signals of photoreception to the brain. I am interested in the cell developmental and biochemical pathways that underlie proper retinal patterning, in addition to changes that occur in the mature retina under different photic and spectral conditions.



McCormick SD, Regish A, Christensen AK, and Bjornsson TB. Differential regulation of sodium-potassium pump isoforms during smolt development and seawater exposure of Atlantic salmon. Journal of Experimental Biology. 2013 216:1142-1151.

Christensen AK, Hiroi J, Schultz ET and McCormick SD. Branchial ionocyte organization and ion transport protein expression in juvenile alewives acclimated to freshwater or seawater. Journal of Experimental Biology. 2012 215:642-652.

McCormick SD, Regish A, Christensen AK. Distinct freshwater and seawater isoforms of Na+/K+-ATPase in gill chloride cells of Atlantic salmon. Journal of Experimental Biology. 2009 212: 3994-4001.

Christensen AK and Jensen AM. Tissue-specific requirements for specific domains within Moe/Epb4.1l5 during early zebrafish development. BMC Developmental Biology. 2008 8:3.

Hsu YC, Willoughby JJ, Christensen AK, Jensen AM. Mosaic Eyes is a novel component of the Crumbs complex and negatively regulates photoreceptor apical size. Development. 2006 133(24):4849-59.

Newmyer SL, Christensen A, Sever S. Auxilin-dynamin interactions link the uncoating ATPase chaperone machinery with vesicle formation. Developmental Cell. 2003 4(6):929-40.