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In some locations, however, magnetic minerals in Earth's crust generate an additional field that enhances or diminishes the overall field, resulting in unusually steep gradients of field intensity within a limited area. How animals respond to such magnetic anomalies is unclear. The Caribbean spiny lobster, Panulirus argus, is a benthic marine invertebrate that possesses a magnetic sense and is likely to encounter magnetic anomalies during migratory movements and homing. As a first step toward investigating whether such anomalies affect the behavior of lobsters, a two-choice preference experiment was conducted in which lobsters were allowed to select one of two artificial dens, one beneath a neodymium magnet and the other beneath a non-magnetic weight of similar size and mass (control). Significantly more lobsters selected the control den, demonstrating avoidance of the magnetic anomaly. In addition, lobster size was found to be a significant predictor of den choice; lobsters that selected the anomaly den were significantly smaller as a group than those that chose the control den. Taken together, these findings provide additional evidence for magnetoreception in spiny lobsters, raise the possibility of an ontogenetic shift in how lobsters respond to magnetic fields, and suggest that magnetic anomalies might influence lobster movement in the natural environment.<\/jats:p>","DOI":"10.1242\/jeb.172205","type":"journal-article","created":{"date-parts":[[2018,1,5]],"date-time":"2018-01-05T01:11:32Z","timestamp":1515114692000},"source":"Crossref","is-referenced-by-count":10,"title":["Size-dependent avoidance of a strong magnetic anomaly in Caribbean spiny lobsters"],"prefix":"10.1242","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5134-1401","authenticated-orcid":false,"given":"David A.","family":"Ernst","sequence":"first","affiliation":[{"name":"Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenneth J.","family":"Lohmann","sequence":"additional","affiliation":[{"name":"Department of Biology, University of North Carolina, Chapel Hill, NC 27599, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2018,1,1]]},"reference":[{"key":"2021042422481306300_JEB172205C1","volume-title":"Locomotory Activity Patterns and Food Items of Benthic Postlarval Spiny Lobsters, Panulirus argus","author":"Andree","year":"1981"},{"key":"2021042422481306300_JEB172205C2","doi-asserted-by":"publisher","first-page":"60","DOI":"10.1038\/nature01226","article-title":"True navigation and magnetic maps in spiny lobsters","volume":"421","author":"Boles","year":"2003","journal-title":"Nature"},{"key":"2021042422481306300_JEB172205C3","doi-asserted-by":"publisher","first-page":"392","DOI":"10.1016\/j.cub.2014.12.035","article-title":"Evidence for geomagnetic imprinting and magnetic navigation in the natal homing of sea turtles","volume":"25","author":"Brothers","year":"2015","journal-title":"Curr. 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