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The mean source levels differed between call types, the lower frequency calls (L, D, and O) tended to have source levels 10\u2009dB higher than the higher frequency calls (H and M). Information on call-type source levels is important to take into account for passive acoustic studies investigating repertoire usage as calls produced with greater amplitudes are likely to have larger acoustic ranges, especially when these are also the calls with lower frequencies, such as is the case in leopard seals.<\/jats:p>","DOI":"10.1121\/1.4895685","type":"journal-article","created":{"date-parts":[[2014,10,8]],"date-time":"2014-10-08T00:31:21Z","timestamp":1412728281000},"page":"1495-1498","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":22,"title":["Source levels of the underwater calls of a male leopard seal"],"prefix":"10.1121","volume":"136","author":[{"given":"Tracey L.","family":"Rogers","sequence":"first","affiliation":[{"name":"University of New South Wales Evolution & Ecology Research Centre, School of BEES, , Sydney, New South Wales, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"231","reference":[{"key":"2023073108000237800_c1","unstructured":"Cummings, W. 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