| body temperature and heat exchange in the hawaiian spinner dolphin, stenella longirostris. | | 1976 | 7421 |
| one-hydrophone method of estimating distance and depth of phonating dolphins in shallow water. | previous attempts at localizing cetaceans have generally used multiple hydrophone arrays and multichannel recording systems. in this paper, a low-budget localization technique using only one hydrophone is described. the time delays of the signals traveling via the surface and bottom reflection paths to the hydrophone, relative to the direct signal, are used to calculate the distance and the depth of a phonating animal. only two additional measures, the depth of the bottom and hydrophone, have to ... | 2000 | 10830396 |
| the whistles of hawaiian spinner dolphins. | the characteristics of the whistles of hawaiian spinner dolphins (stenella longirostris) are considered by examining concurrently the whistle repertoire (whistle types) and the frequency of occurrence of each whistle type (whistle usage). whistles were recorded off six islands in the hawaiian archipelago. in this study hawaiian spinner dolphins emitted frequency modulated whistles that often sweep up in frequency (47% of the whistles were upsweeps). the frequency span of the fundamental componen ... | 2002 | 12509029 |
| the spatial context of free-ranging hawaiian spinner dolphins (stenella longirostris) producing acoustic signals. | to improve our understanding of how dolphins use acoustic signals in the wild, a three-hydrophone towed array was used to investigate the spatial occurrence of hawaiian spinner dolphins (stenella longirostris) relative to each other as they produced whistles, burst pulses, and echolocation clicks. groups of approximately 30 to 60 animals were recorded while they traveled and socialized in nearshore waters off oahu, hawaii. signaling animals were localized using time of arrival difference cues on ... | 2006 | 16521785 |
| rolling stones and stable homes: social structure, habitat diversity and population genetics of the hawaiian spinner dolphin (stenella longirostris). | spinner dolphins (stenella longirostris) exhibit different social behaviours at two regions in the hawaiian archipelago: off the high volcanic islands in the se archipelago they form dynamic groups with ever-changing membership, but in the low carbonate atolls in the nw archipelago they form long-term stable groups. to determine whether these environmental and social differences influence population genetic structure, we surveyed spinner dolphins throughout the hawaiian archipelago with mtdna co ... | 2010 | 20089122 |
| passive acoustic monitoring of coastally associated hawaiian spinner dolphins, stenella longirostris, ground-truthed through visual surveys. | effective decision making to protect coastally associated dolphins relies on monitoring the presence of animals in areas that are critical to their survival. hawaiian spinner dolphins forage at night and rest during the day in shallow bays. due to their predictable presence, they are targeted by dolphin-tourism. in this study, comparisons of presence were made between passive acoustic monitoring (pam) and vessel-based visual surveys in hawaiian spinner dolphin resting bays. dsg-ocean passive aco ... | 2016 | 27475147 |
| muscle biochemistry of a pelagic delphinid (stenella longirostris longirostris): insight into fishery-induced separation of mothers and calves. | the length of time required for postnatal maturation of the locomotor muscle (longissimus dorsi) biochemistry [myoglobin (mb) content and buffering capacity] in marine mammals typically varies with nursing duration, but it can be accelerated by species-specific behavioral demands, such as deep-diving and sub-ice transit. we examined how the swimming demands of a pelagic lifestyle influence postnatal maturation of mb and buffering capacity in spinner dolphins (stenella longirostris longirostris). ... | 2017 | 28424314 |
| automatic classification of delphinids based on the representative frequencies of whistles. | classification of odontocete species remains a challenging task for passive acoustic monitoring. classifiers that have been developed use spectral features extracted from echolocation clicks and whistle contours. most of these contour-based classifiers require complete contours to reduce measurement errors. therefore, overlapping contours and partially detected contours in an automatic detection algorithm may increase the bias for contour-based classifiers. in this study, classification was cond ... | 2015 | 26328716 |
| the broadband social acoustic signaling behavior of spinner and spotted dolphins. | efforts to study the social acoustic signaling behavior of delphinids have traditionally been restricted to audio-range (<20 khz) analyses. to explore the occurrence of communication signals at ultrasonic frequencies, broadband recordings of whistles and burst pulses were obtained from two commonly studied species of delphinids, the hawaiian spinner dolphin (stenella longirostris) and the atlantic spotted dolphin (stenella frontalis). signals were quantitatively analyzed to establish their full ... | 2003 | 14514216 |
| limited trophic partitioning among sympatric delphinids off a tropical oceanic atoll. | understanding trophic relationships among marine predators in remote environments is challenging, but it is critical to understand community structure and dynamics. in this study, we used stable isotope analysis of skin biopsies to compare the isotopic, and thus, trophic niches of three sympatric delphinids in the waters surrounding palmyra atoll, in the central tropical pacific: the melon-headed whale (peponocephala electra), gray's spinner dolphin (stenella longirostris longirostris), and the ... | 2017 | 28767677 |
| discriminating features of echolocation clicks of melon-headed whales (peponocephala electra), bottlenose dolphins (tursiops truncatus), and gray's spinner dolphins (stenella longirostris longirostris). | spectral parameters were used to discriminate between echolocation clicks produced by three dolphin species at palmyra atoll: melon-headed whales (peponocephala electra), bottlenose dolphins (tursiops truncatus) and gray's spinner dolphins (stenella longirostris longirostris). single species acoustic behavior during daytime observations was recorded with a towed hydrophone array sampling at 192 and 480 khz. additionally, an autonomous, bottom moored high-frequency acoustic recording package (har ... | 2010 | 20968391 |