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41 results for “blue whale”
Data from: Genetic variation in blue whales in the eastern Pacific: implication for taxonomy and use of common wintering grounds
Many aspects of blue whale biology are poorly understood. Some of the gaps in our knowledge, such as those regarding their basic taxonomy and seasonal movements, directly affect our ability to monitor and manage blue whale populations. As a step towards filling in some of these gaps, microsatellite and mtDNA sequence analyses were conducted on blue whale samples from the Southern Hemisphere, the eastern tropical Pacific (ETP), and the northeast Pacific. The results indicate that the ETP is differentially used by blue whales from the northern and southern eastern Pacific, with the former showing stronger affinity to the region off Central America known as the Costa Rican Dome, and the latter favoring the waters of Peru and Ecuador. Although the pattern of genetic variation throughout the Southern Hemisphere is compatible with the recently proposed subspecies status of Chilean blue whales, some discrepancies remain between catch lengths and lengths from aerial photography, and not all blue whales in Chilean waters can be assumed to be of this type. Also, the range of the proposed Chilean subspecies, which extends to the Galapagos region of the ETP, at least seasonally, perhaps should include the Costa Rican Dome and the eastern North Pacific as well.
Figure S4.16. Dynamic weekly suitability map for blue whales around central group islands (Pico, Faial, São Jorge and Terceira), Azores.
<p>Dynamic weekly suitability map for blue whales around central group islands (Pico, Faial, São Jorge and Terceira), Azores.</p>
Figure 4 in Photogrammetry of blue whales with an unmanned hexacopter
Figure 4. Photogrammetry measurements of body length from rostrum tip to tail notch, and width at 40% of the body length from the rostrum, for 22 individual blue whales. Labels indicate a notably robust (a) and a lean (b) whale, that were outliers from the general trend (see Fig. 3 for photographs of these same whales). Closed circles indicate two presumed adult females, which were accompanied by the two smallest whales that appeared to be dependent calves.
Figure 2 in Photogrammetry of blue whales with an unmanned hexacopter
Figure 2. Photograph of the hexacopter being hand retrieved from the foredeck of the 18.6 m wooden boat by a ground station operator (MM) with pilot (JD) close by.
Figure 1 in Photogrammetry of blue whales with an unmanned hexacopter
Figure 1. Map showing the location of the study area in southern Chile (left), with closed circles indicating the locations in the Gulf of Corcovado and Gulf of Ancud (right) where a small, unmanned hexacopter was launched from a boat to take aerial photographs of blue whales.
Fig. 3 in Temporal occurrence of three blue whale populations in New Zealand waters from passive acoustic monitoring
Fig. 3.—Temporal occurrence pattern of New Zealand (dark blue), Antarctic (red), and Australian (yellow) blue whale song detections at each of the five hydrophones. The y-axis represents the number of hours per day that blue whale song was detected, and the x-axis represents the recording period. Grayed out sections represent gaps in recording due to hydrophone refurbishment.
Fig. 2 in Temporal occurrence of three blue whale populations in New Zealand waters from passive acoustic monitoring
Fig. 2.—Example spectrograms of the three song types recorded in New Zealand waters. (A) New Zealand song on 31 May 2016, (B) Antarctic song on 26 August 2017, and (C) Australian song on 22 January 2017. Spectrograms are configured with a 2048-point fast Fourier transform, Hann window, 50% overlap.
Fig. 4 in Temporal occurrence of three blue whale populations in New Zealand waters from passive acoustic monitoring
Fig. 4.—Conceptual map illustrating the current understanding of the approximate typical range of each blue whale population. Colors indicate the song type, and patterns represent inferred ecological use of each region. Distribution and occurrence patterns are synthesized from acoustic research published in the literature (e.g., Stafford et al. 2004; Balcazar et al. 2015, 2017; Tripovich et al. 2015; McCauley et al. 2018; Warren et al. 2021), and findings presented in this study.
Fig. 1 in Temporal occurrence of three blue whale populations in New Zealand waters from passive acoustic monitoring
Fig. 1.—Map of the study area in the South Taranaki Bight region, with hydrophone locations denoted by the stars. Gray lines show bathymetry contours at 50-m depth increments, from 0 to 500 m. Location of the study area within New Zealand is indicated by the inset map.
Data from: Circumpolar diversity and geographic differentiation of mtDNA in the critically endangered Antarctic blue whale (Balaenoptera musculus intermedia)
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Data from: Hybridization of Southern Hemisphere blue whale subspecies and a sympatric area off Antarctica: impacts of whaling or climate change?
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Data from: Blue whale population structure along the eastern South Pacific Ocean: evidence of more than one population
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Data from: Behavioral responses of individual blue whales (Balaenoptera musculus) to mid-frequency military sonar
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Data from: Genetic variation in blue whales in the eastern Pacific: implication for taxonomy and use of common wintering grounds
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Data from: New determination of prey and parasite species for Northern Indian Ocean blue whales
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Figure S4.15. Dynamic weekly suitability map for blue whales around São Miguel island, Azores.
<p>Dynamic weekly suitability map for blue whales around São Miguel island, Azores.</p>
Figure 3 in Using calls as an indicator for Antarctic blue whale occurrence and distribution across the southwest Pacific and southeast Indian Oceans
Figure 3. Percentage of hours per month with calls from January 2010 to December 2011 at the Tasman Sea, Samoa, Bass Strait, and Perth Canyon sites. Asterisk (*) months indicate that data were not available.
Figure 2 in Using calls as an indicator for Antarctic blue whale occurrence and distribution across the southwest Pacific and southeast Indian Oceans
Figure 2. Percentage of hours per month with calls over a 12 mo period (January to December) at the Dampier (DM) in 2013, the Perth Canyon (PC) in 2010, Bass Strait (BS) in 2010, Tasman Sea (TS) in 2010, Tonga (TN) in 2010, and Samoa (SA) in 2009 sites. Asterisk (*) months indicate that data were not available.
Figure 1 in Using calls as an indicator for Antarctic blue whale occurrence and distribution across the southwest Pacific and southeast Indian Oceans
Figure 1. Examples of the Antarctic blue whale calls detected from: (a) Dampier on 22 May 2013, (b) Perth Canyon on 9 August 2010, (c) Bass Strait on 7 August 2010, (d) Samoa on 16 January 2011, (e) Tonga on 23 July 2009, and (f) Tasman Sea on 28 April 2011. Spectrogram parameters show 512 samples per frame, 0.625 hop size in Hann window.
Figure 3 in Photogrammetry of blue whales with an unmanned hexacopter
Figure 3. Example overhead photographs of two blue whales in a flat orientation as they are about to the break the surface to breath; (a) shows a whale in robust body condition, (b) shows a whale in lean condition (see Fig. 4). Body length measurements were made from the tip of rostrum to the tail notch and body width measurements were taken at the point on the whales' body that equaled 40% of the body length from the rostrum (solid reference lines). Images taken from altitudes of 50–60 m using an Olympus E-PM2 camera mounted on the APH-22 hexacopter.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
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OpenNeuro
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