{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T05:13:04Z","timestamp":1790831584968,"version":"4.1.0"},"reference-count":27,"publisher":"The Company of Biologists","issue":"11","license":[{"start":{"date-parts":[[2000,6,1]],"date-time":"2000-06-01T00:00:00Z","timestamp":959817600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/www.biologists.com\/user-licence-1-1\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2000,6,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>The pelvis of crocodilians is highly derived in that the pubic bones are isolated from the acetabulum and are attached to the ischia via moveable joints. We examined the possible role of this unusual morphology in lung ventilation by measuring ventilation, abdominal pressure and the electrical activity of several abdominal and pelvic muscles in the American alligator (Alligator mississippiensis). We found that the activity of two pelvic muscles, the ischiopubis and ischiotruncus muscles, was correlated with inspiration; these muscles rotate the pubes ventrally and thereby increase abdominal volume. During expiration, contraction of the rectus abdominis and transversus abdominis rotates the pubes dorsally. We suggest that this mechanism facilitates diaphragmatic breathing by creating space for caudal displacement of the viscera during inspiration. Because birds also use a dorso-ventral movement of the pelvis to effect ventilation, some form of pelvic aspiration may be plesiomorphic for archosaurs.<\/jats:p>","DOI":"10.1242\/jeb.203.11.1679","type":"journal-article","created":{"date-parts":[[2021,4,25]],"date-time":"2021-04-25T05:36:48Z","timestamp":1619329008000},"page":"1679-1687","source":"Crossref","is-referenced-by-count":81,"title":["PELVIC ASPIRATION IN THE AMERICAN ALLIGATOR (<i>ALLIGATOR MISSISSIPPIENSIS<\/i>)"],"prefix":"10.1242","volume":"203","author":[{"given":"Colleen G.","family":"Farmer","sequence":"first","affiliation":[{"name":"1 Department of Ecology and Evolutionary Biology, 321 Steinhaus Hall, University of California, Irvine, CA 92697, USA"},{"name":"1 Department of Ecology and Evolutionary Biology, 321 Steinhaus Hall, University of California, Irvine, CA 92697, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David R.","family":"Carrier","sequence":"additional","affiliation":[{"name":"University of Utah 2 Department of Biology , , 257 South 1400 East, Salt Lake City, UT 84112-0840, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2000,6,1]]},"reference":[{"key":"2024121804553330400_JEXBIO_203_11_1679C1","doi-asserted-by":"publisher","first-page":"145","DOI":"10.1016\/0034-5687(89)90048-0","article-title":"The effects of locomotion on respiratory muscle activity in the awake dog","volume":"78","author":"Ainsworth","year":"1989","journal-title":"Respir. 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