Killer Whale - Orca Network
... environment that largely envelops our planet. Not only are they the most widespread large animals on the planet, but as air-breathers they are conspicuous and eminently identifiable. Consequently, they have been studied by numerous people around the globe, for decades in some cases. And yet scientis ...
... environment that largely envelops our planet. Not only are they the most widespread large animals on the planet, but as air-breathers they are conspicuous and eminently identifiable. Consequently, they have been studied by numerous people around the globe, for decades in some cases. And yet scientis ...
- Wiley Online Library
... For humpback whales, it is generally assumed that their most important nonhuman predators are MEKWs (Jefferson et al. 1991, Paterson and Paterson 2001, Ford and Reeves 2008). Until very recently, however, based on the relatively few documented attacks (Chittleborough 1953, Whitehead and Glass 1985, ...
... For humpback whales, it is generally assumed that their most important nonhuman predators are MEKWs (Jefferson et al. 1991, Paterson and Paterson 2001, Ford and Reeves 2008). Until very recently, however, based on the relatively few documented attacks (Chittleborough 1953, Whitehead and Glass 1985, ...
Status of Killer Whales in Canada
... Canadian Arctic and western Atlantic small numbers were killed historically in commercial whaling operations (or shot incidentally to such operations), and small numbers have been documented taken by natives. Predictable concentrations of killer whales are found in British Columbia (B.C.), and popul ...
... Canadian Arctic and western Atlantic small numbers were killed historically in commercial whaling operations (or shot incidentally to such operations), and small numbers have been documented taken by natives. Predictable concentrations of killer whales are found in British Columbia (B.C.), and popul ...
Eastern Pacific Grey Whale Management Plan for the Eastern
... and their main summer feeding grounds in the Bering, Chukchi and Alaskan Beaufort Seas. A small part of the population (e.g. a few hundred), termed the Pacific Coast Feeding Aggregation, (PCFA) does not undertake the entire migration to Arctic feeding areas, and spends the summer feeding in temperat ...
... and their main summer feeding grounds in the Bering, Chukchi and Alaskan Beaufort Seas. A small part of the population (e.g. a few hundred), termed the Pacific Coast Feeding Aggregation, (PCFA) does not undertake the entire migration to Arctic feeding areas, and spends the summer feeding in temperat ...
Killer Whales and Marine Mammal Trends in The North Pacific—A
... Straley 1994). All three communities have significant differences in mtDNA and nuclear (microsatellite) DNA (Barrett-Lennard 2000) and are considered discrete populations. Over 300 whales have been identified in the West Coast population (Black et al. 1997; Dahlheim et al. 1997; Ford and Ellis 1999) ...
... Straley 1994). All three communities have significant differences in mtDNA and nuclear (microsatellite) DNA (Barrett-Lennard 2000) and are considered discrete populations. Over 300 whales have been identified in the West Coast population (Black et al. 1997; Dahlheim et al. 1997; Ford and Ellis 1999) ...
killer whales and marine mammal trends in the north pacific—a re
... Straley 1994). All three communities have significant differences in mtDNA and nuclear (microsatellite) DNA (Barrett-Lennard 2000) and are considered discrete populations. Over 300 whales have been identified in the West Coast population (Black et al. 1997; Dahlheim et al. 1997; Ford and Ellis 1999) ...
... Straley 1994). All three communities have significant differences in mtDNA and nuclear (microsatellite) DNA (Barrett-Lennard 2000) and are considered discrete populations. Over 300 whales have been identified in the West Coast population (Black et al. 1997; Dahlheim et al. 1997; Ford and Ellis 1999) ...
Predation by killer whales (Orcinus orca) on southern right whales
... right whales over the study period (map modified from Rowntree et al., 2001) Data collection and analysis The term “encounter” refers to the simultaneous occurrence of orcas and right whales at the same site (at distances ranging from 1.5 km to physical contact between the two species), whether or n ...
... right whales over the study period (map modified from Rowntree et al., 2001) Data collection and analysis The term “encounter” refers to the simultaneous occurrence of orcas and right whales at the same site (at distances ranging from 1.5 km to physical contact between the two species), whether or n ...
full paper here
... We collected 176 records of killer whales, of which 81 (46%) were obtained from the literature and 95 (54%) are new reports. The records included 27 captures or kills (15%), four strandings (2%) and 145 sightings (82%; Fig. 1). ...
... We collected 176 records of killer whales, of which 81 (46%) were obtained from the literature and 95 (54%) are new reports. The records included 27 captures or kills (15%), four strandings (2%) and 145 sightings (82%; Fig. 1). ...
Orcas in Puget Sound - Puget Sound Nearshore Ecosystem
... Since annual identification of each individual resident orca has been done for the last 32 years, long-term population dynamics of this group of whales are known. Despite this unusually large database, uncertainties persist because the studies only span about half the average lifetime of a female. A ...
... Since annual identification of each individual resident orca has been done for the last 32 years, long-term population dynamics of this group of whales are known. Despite this unusually large database, uncertainties persist because the studies only span about half the average lifetime of a female. A ...
Short Note - Aquatic Mammal Journal`s
... the sperm whales would periodically move away from the sperm whales and briefly regroup (i.e., move into close proximity to one another) with the other killer whales immediately following surface tail slaps of one of the killer whales, primarily the adult male. All of the killer whales would remain ...
... the sperm whales would periodically move away from the sperm whales and briefly regroup (i.e., move into close proximity to one another) with the other killer whales immediately following surface tail slaps of one of the killer whales, primarily the adult male. All of the killer whales would remain ...
Dividing up the pie: Whales, fish, and humans as competitors
... whale sanctuaries in the Indian Ocean (1979) and the Antarctic (1992). Since then, some of the great whales have been showing signs of recovery (IUCN, 2011). Indeed, humpback (Megaptera novaeangliae) and southern right whales (Eubalaena australis) have been reclassified as species of ‘‘least concern’ ...
... whale sanctuaries in the Indian Ocean (1979) and the Antarctic (1992). Since then, some of the great whales have been showing signs of recovery (IUCN, 2011). Indeed, humpback (Megaptera novaeangliae) and southern right whales (Eubalaena australis) have been reclassified as species of ‘‘least concern’ ...
Killer Whales in Hawaiian Waters: Information
... author (D.J.M.) and thus their identifications are considered accurate. In two periods ( January 1998, May 2003) there were multiple records (two or three) in the same area within a few weeks of each other, and it is possible ...
... author (D.J.M.) and thus their identifications are considered accurate. In two periods ( January 1998, May 2003) there were multiple records (two or three) in the same area within a few weeks of each other, and it is possible ...
Ecosystem Impact of the Decline of Large Whales in the North Pacific
... mammalian metabolic rate, and their relatively high trophic position (Trites 2001), it is likely that the removal of large whales over a 150-year period by human harvest had cascading effects, leading to changes in energy flow and species composition at other trophic levels (Bowen 1997). In Antarcti ...
... mammalian metabolic rate, and their relatively high trophic position (Trites 2001), it is likely that the removal of large whales over a 150-year period by human harvest had cascading effects, leading to changes in energy flow and species composition at other trophic levels (Bowen 1997). In Antarcti ...
First Mass Stranding of Killer Whales (Orcinus orca) in the Gulf of
... Mass Stranding of Killer Whales in Gulf of California, Mexico & Aguilar, 2002). This fact does not seem to be a current problem in the Gulf of California, at least for species such as the blue whale (Balaenoptera musculus) in which analysis of the presence of pollutants found in the blubber have be ...
... Mass Stranding of Killer Whales in Gulf of California, Mexico & Aguilar, 2002). This fact does not seem to be a current problem in the Gulf of California, at least for species such as the blue whale (Balaenoptera musculus) in which analysis of the presence of pollutants found in the blubber have be ...
Friedlaender et al. Antarctic whale resource partitioning 1 1
... a non-limiting prey resource. In order to examine ecological differences between sympatric humpback and minke whales around the Western Antarctic Peninsula, we made measurements of the physical environment, observations of whale distribution, and concurrent acoustic measurements of krill aggregation ...
... a non-limiting prey resource. In order to examine ecological differences between sympatric humpback and minke whales around the Western Antarctic Peninsula, we made measurements of the physical environment, observations of whale distribution, and concurrent acoustic measurements of krill aggregation ...
are cetacea ecologically important? - Whitehead Lab
... Viale (1985) estimated that the cetaceans in the northwestern Mediterranean eat about 229000 tons of sauid ner vear. about 2.3 times the predation by the "very teuthophagous" population of humans in the same area. In the Southern Ocean, Laws (1977b) estimated that before commercial whaling the balee ...
... Viale (1985) estimated that the cetaceans in the northwestern Mediterranean eat about 229000 tons of sauid ner vear. about 2.3 times the predation by the "very teuthophagous" population of humans in the same area. In the Southern Ocean, Laws (1977b) estimated that before commercial whaling the balee ...
Management by Totemization: Whale
... Lyrical litanies on the bio-radio pigs, lambs, turkeys,and chickens. To them whalesare unique. That draw on an oral tradition of submarine songs It has been argued that therea growing is tendency in modem From a living memory bank, founded fifty million years ago. society to treat certain animals as ...
... Lyrical litanies on the bio-radio pigs, lambs, turkeys,and chickens. To them whalesare unique. That draw on an oral tradition of submarine songs It has been argued that therea growing is tendency in modem From a living memory bank, founded fifty million years ago. society to treat certain animals as ...
Killer whale (Orcinus orca) occurrence and predation in the
... more times over a 10-yr period (2001 to 2011). Of particular note were sightings of this whale off south-west Abaco Island in June 2001, and only 5 km away from this location eight years later, in July 2009. During eight of the nine encounters that included Oo4 between 1995 and 2011, he was observed ...
... more times over a 10-yr period (2001 to 2011). Of particular note were sightings of this whale off south-west Abaco Island in June 2001, and only 5 km away from this location eight years later, in July 2009. During eight of the nine encounters that included Oo4 between 1995 and 2011, he was observed ...
Chapter 14: Marine Mammals
... herding schools of fish along a shoreline—clearly, some form of communication between pod members is involved in this process. Dolphins and whales (such as sperm whales) also use sound waves to sense objects in their environment and to locate prey. This natural form of sonar, in which sound produced ...
... herding schools of fish along a shoreline—clearly, some form of communication between pod members is involved in this process. Dolphins and whales (such as sperm whales) also use sound waves to sense objects in their environment and to locate prey. This natural form of sonar, in which sound produced ...
Beaked whales - St Andrews Research Repository
... showing that these species routinely dive to more mesopelagic depths where they hunt for small, deep- ...
... showing that these species routinely dive to more mesopelagic depths where they hunt for small, deep- ...
Roman et al. 2014
... induced recycling and upperFigure 1. Examples of the influence of whales on diverse ecosystem functions. Black bars ocean retention of nutrients represent estimated pre-whaling contributions; gray bars show contributions from currently (Roman and McCarthy 2010). estimated populations. Data for gray ...
... induced recycling and upperFigure 1. Examples of the influence of whales on diverse ecosystem functions. Black bars ocean retention of nutrients represent estimated pre-whaling contributions; gray bars show contributions from currently (Roman and McCarthy 2010). estimated populations. Data for gray ...
Sequential megafaunal collapse in the North Pacific Ocean: An
... Several features of great whale life history and behavior may also function to reduce the likelihood of killer whale predation. For instance, sperm whales, long thought to be immune to killer whales, are now known to be preyed on by them and to assume stereotypical formations to ward off the attacks ...
... Several features of great whale life history and behavior may also function to reduce the likelihood of killer whale predation. For instance, sperm whales, long thought to be immune to killer whales, are now known to be preyed on by them and to assume stereotypical formations to ward off the attacks ...
Sequential megafaunal collapse in the North Pacific
... Several features of great whale life history and behavior may also function to reduce the likelihood of killer whale predation. For instance, sperm whales, long thought to be immune to killer whales, are now known to be preyed on by them and to assume stereotypical formations to ward off the attacks ...
... Several features of great whale life history and behavior may also function to reduce the likelihood of killer whale predation. For instance, sperm whales, long thought to be immune to killer whales, are now known to be preyed on by them and to assume stereotypical formations to ward off the attacks ...
Is the change in distribution and abundance of blue whales related
... whereas it numbered in the thousands at the beginning of the 20th century. This major decline is a result of commercial whaling at the beginning of the 20th century. Although blue whales have been protected globally since 1966, it appears that very low calving and recruitment rates have produced ver ...
... whereas it numbered in the thousands at the beginning of the 20th century. This major decline is a result of commercial whaling at the beginning of the 20th century. Although blue whales have been protected globally since 1966, it appears that very low calving and recruitment rates have produced ver ...
Beaked whales - Marine Bioacoustics Lab
... niches. Beaked whales routinely dive deeper than 1km for an hour or more, and surface for such a short time that they are very difficult to sight (Figure 1). This cryptic lifestyle has, until recently, left us with very little information about some of the world’s biggest predators beyond what can b ...
... niches. Beaked whales routinely dive deeper than 1km for an hour or more, and surface for such a short time that they are very difficult to sight (Figure 1). This cryptic lifestyle has, until recently, left us with very little information about some of the world’s biggest predators beyond what can b ...
Blue whale
The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whales (Mysticeti). At 30 metres (98 ft) in length and 180 tonnes (200 short tons) or more in weight, it is the largest extant animal and is the heaviest known to have existed.Long and slender, the blue whale's body can be various shades of bluish-grey dorsally and somewhat lighter underneath. There are at least three distinct subspecies: B. m. musculus of the North Atlantic and North Pacific, B. m. intermedia of the Southern Ocean and B. m. brevicauda (also known as the pygmy blue whale) found in the Indian Ocean and South Pacific Ocean. B. m. indica, found in the Indian Ocean, may be another subspecies. As with other baleen whales, its diet consists almost exclusively of small crustaceans known as krill.Blue whales were abundant in nearly all the oceans on Earth until the beginning of the twentieth century. For over a century, they were hunted almost to extinction by whalers until protected by the international community in 1966. A 2002 report estimated there were 5,000 to 12,000 blue whales worldwide, in at least five groups. More recent research into the Pygmy subspecies suggests this may be an overestimate. Before whaling, the largest population was in the Antarctic, numbering approximately 239,000 (range 202,000 to 311,000). There remain only much smaller (around 2,000) concentrations in each of the eastern North Pacific, Antarctic, and Indian Ocean groups. There are two more groups in the North Atlantic, and at least two in the Southern Hemisphere. As of 2014, the Californian blue whale population has rebounded to nearly its pre-hunting population.