It occurs from the sub-Antarctic zone to the southern Indian Ocean and southwestern Pacific Ocean, breeding in the Indian and South Atlantic oceans, and travelling south to above the Antarctic to feed.Pygmy blue whales are believed to be more numerous than the other subspecies, possibly making up half of all blue whales alive today.According to observations made since the subspecies was first described in 1966, the pygmy blue whale differs from the "true" blue whales in a number of physical characteristics. Pygmy Blue Whales inhabit a zone generally north of the Antarctic convergence.
Evolutionary history. The only location all calls have been detected within a short space of time in the same season is Bass Strait, where inter-species mixing commonly occurs. Pygmy blue whales are typically distributed north of the Antarctic Convergence and are most abundant in waters off Australia, Madagascar, and New Zealand. As with other blue whale subspecies, outside the austral summer their distribution and movements are poorly understood. – In the austral summer and fall (January through at least April), blue whales have been found off the western coast of Isla de Chiloe, in the Golfo de Corcovado, in the waters around the Chonos Archipelago and the Moraleda Channel, and 58 °S) with concentrations between lat. 10) (Kato et al., 1995). The distribution of the pygmy blue whale is north of the Ant-arctic Convergence, while that of the true blue whale is south of the Conver-gence in the austral summer (Fig. Other threats, which could impact on the entire population, include potential commercial expansion of the Antarctic and sub-Antarctic krill fishery which could result in more competition for the krill resource and less food available for Blue Whales.Global warming has the potential to impact on the availability of Antarctic Krill Euphausia superba in the Antarctic region, which is a crucial source of food for Blue Whales to survive.
Assess and manage physical disturbance and development activities such as shipping (collision with ships), aquaculture, pollution, recreational boating, and oil & gas exploration and extraction industries – including the application of environmental impact assessment and approvals and the development of industry guidelines and State/Commonwealth government regulations.SWIFFT does not warrant the accuracy or completeness of information on this page and any person using or relying upon such information does so on the basis that the SWIFFT shall bear no responsibility or liability whatsoever for any errors, faults, defects or omissions in the information.Bushfire Recovery - community wildlife reporting,Southern Right Whale photo identification project,Conservation values assessment – Bonney Upwelling,Australian National Guidelines for Whale and Dolphin Watching 2017,EPBC Act Interaction between offshore seismic exploration and whales,Commission for the Conservation of Antarctic Marine Living Resources,Southern Ocean - Global Ocean Ecosystem Dynamics.Three physiographically discrete regions have been identified and described in the above paper.
True blue whales occur mainly in the relatively high lati-tudes. Within a season the Portland site did not show consistency of EIO PB whale presence or number of calling individuals, but when the number of calling individuals was integrated across a season and correlated with an upwelling index of seasonally integrated seabed water temperature across seven seasons, the upwelling index predicted 83% of the seasonal variance in whale presence. Receivers on the shelf break south of Portland (141.2° E) showed 10–181 times greater EIO PB whale calling when integrated over their three month season than at sites located around the Great Australian Bight to the west. An unnamed subspecies of blue whale is found in the southeastern Pacific Ocean, particularly in the Chiloense Ecoregion, and migrates to lower latitude areas, including the Galapagos Islands and the eastern tropical Pacific. Distinctive features of the Blue Whale include; long streamline shape, small triangular dorsal fin positioned far back on the body, pointed flippers and a single prominent ridge along the upper surface of the head ending in a prominent knob around the blowholes.
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