Geographic variation in the time‐frequency characteristics of high‐frequency whistles produced by killer whales (Orcinus orca)

Abstract

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Geographic variation in Risso's dolphin echolocation click spectra

“…It is particularly challenging to determine population boundaries for cetaceans due to their wide-ranging and largely pelagic distributions, but stable bioacoustic signal differences may be a useful line of evidence for determining population structure when combined with or supported by evidence of genetic, morphological, or distributional density differences (Martien et al, 2015). Population-specific differences in bioacoustic signals have been hypothesized for many mysticetes (e.g., Winn et al, 1981;McDonald et al, 2006;Delarue et al, 2009;Castellote et al, 2012) and some odontocetes (e.g., Rendell et al, 2012;Barkley et al, 2014;Samarra et al, 2015), and in some cases, these hypotheses are supported by genetic, morphometric, or distributional lines of evidence (Branch et al, 2007a;Branch et al, 2007b;Torres-Florez et al, 2014). As anthropogenic threats, such as pollution and fisheries interactions, increasingly impact the oceans and the cetaceans that inhabit them, it is necessary to have a solid baseline understanding of population structure to guide management decisions.…”

The Grand Challenges in Researching Marine Noise Pollution from Vessels: A Horizon Scan for 2017

“…As discussed, the findings shown in Table 3 appeared to be at odds with the findings of the Horizon scan, see Figure 4. However, when we considered the content of the articles identified, it was notable that although there were a significant number of publications the research effort appears to center around only a few species: for example, killer whales (Erbe, 2002;Morton and Symonds, 2002;Holt et al, 2009;Wieland et al, 2010;Williams et al, 2014b;Samarra et al, 2015;Houghton et al, 2015; and bottlenose dolphins Buckstaff, 2004;Nachtigall et al, 2004;Luis et al, 2014;Bas et al, 2015;Gospić and Picciulin, 2016). Perhaps un-coincidentally these are also two species that we have more knowledge pertaining to their hearing capabilities due to research conducted on captive animals.…”

“…Work has already been undertaken to identify specific frequencies that can be associated with distinct behaviors in several species of marine mammal partly to determine the potential impact of noise in the same frequency band Clark et al, 2010;Wieland et al, 2010;Papale et al, 2015;Samarra et al, 2015;Gospić and Picciulin, 2016). It should be noted, however, that the impact of non-overlapping noise, i.e., noise occurring in frequency bands not utilized by the individual for their own transmissions, has received less attention.…”

An Inventory of Peer-reviewed Articles on Killer Whales (Orcinus orca) with a Comparison to Bottlenose Dolphins (Tursiops truncatus)

“…Additionally, articles retrieved by the keywords, Tursiops or dolphins, were added to the sample only if the species, Tursiops truncatus or Atlantic bottlenose dolphin, was specified. Wild: Samarra et al, 2015;King & Janik, 2015 Note. An asterisk denotes topics that are related to assessing well-being.…”