The few remaining
killer whale populations in European waters have very low, or zero rates of reproduction, and are close to extinction in industrialised parts of Europe.
Some researchers think that a similar process is occurring in
the killer whale populations of the Northeast Atlantic.
It is fundamental for evaluating the status of
killer whale populations.
NEW THREATS TO GRAY WHALES AS TRANSIENTS BECOME» RESIDENTS» Check out this awesome article from Kiro 7 News regarding our Transient
Killer Whale population!
The menace of an oil spill from new Texas - bound tankers has nature - loving British Columbians rising up in opposition to expanded ocean traffic along the coast, that, amongst other environmental threats, endangers
the killer whale population, the iconic Orcas.
Not exact matches
Marine mammal toxicologist Peter Ross of the Vancouver Museum told Science News that he doesn't expect the chemicals to disappear from Pacific
killer whales, another
population in which the chemical contamination has been well documented, until the end of this century.
STILL POLLUTED Some of Europe's fragile
populations of
killer whales and other dolphins still carry high concentrations of PCBs decades after the toxic substances were banned.
Despite the long gap since then, mean concentration of the chemicals in the blubber of some
populations of Europe's
killer whales exceeds — often by a lot — a high threshold for health damage.
Finally, the team calculated that the dozen observed
killer whale attacks on otters, extrapolated to the general
population, could account entirely for the observed declines.
• In the Northern Pacific and the southern Bering Sea,
killer whales have been linked to collapsing
populations of fur seals and harbor seals.
Estes calls the hunt the «first concrete and well - chronicled example of
killer whales coming in and doing a significant amount of damage to a
population.»
He adds, «With all the other cases, there is some uncertainty as to whether the
population declines were really caused by
killer whales.»
He later said that the minke
whale population estimate was mistaken and noted that there was little compelling evidence showing that
killer whales were significantly reducing minke
whale numbers in that region.
Though Estes can't prove it, he thinks the
killer whales subsequently turned to other
populations of marine mammals, first decimating seals and sea lions before doing the same to otters.
The earlier study also compared shark
population numbers with other apex predators, such as polar bears and
killer whales.
To dive deeper into that issue, researchers examined 43 years» worth of demographic data on two
populations of
killer whales in the Pacific Northwest.
«
Killer whales have been thought of by some as something like the poster child» for the process, «because there are multiple genetically distinct
populations [which have not yet been formally described as separate species] with different prey preferences in the North Pacific and Antarctic,» says Phillip Morin, a cetacean biologist at the Southwest Fisheries Science Center in San Diego, California, who was not involved in the new study.
The findings may also explain why harbor seal
populations are declining in fjords whose glaciers have retreated onto land: Without the acoustic camouflage provided by the bubble - induced din, the seals may have a harder time evading their main predator, the
killer whale.
As a result, understanding changes in
population size for social species — several of which, such as African wild dogs and southern resident
killer whales, are endangered — requires understanding of what goes on within groups and how individuals fare when they strike out on their own.
We found that PCBs were at excessively high concentrations in the blubber of several marine apex predator species across Europe, including
killer whales and bottlenose dolphins, and were associated with long - term and on - going
population declines.
32 Northwest mollusks 404 Southeast aquatic, riparian, and wetland species Acuna cactus Amargosa toad American pika (federal) American, Taylor, Yosemite, Gray - headed, White Mountains and Mt. Whitney pika (California) Andrew's dune scarab beetle Ashy storm - petrel Atlantic bluefin tuna Bearded seal Black abalone Blumer's dock Bocaccio (central / southern
population) Cactus ferruginous pygmy owl California spotted owl California tiger salamander (federal) California tiger salamander (California) Canelo Hills ladies» tresses Casey's June beetle Cherry Point Pacific herring Chiricahua leopard frog Colorado River cutthroat trout Cook Inlet beluga
whale (1999) Cook Inlet beluga
whale (2006) Delta smelt Desert nesting bald eagle Dusky tree vole Elkhorn coral Gentry's indigobush Giant palouse earthworm Gila chub Great Basin spring snails Headwater chub Holmgren's milk - vetch Huachuca water umbel Iliamna lake seals Island fox Island marble butterfly Kern brook lamprey Kittlitz's murrelet (Alaska) Kittlitz's murrelet (federal) Klamath River chinook salmon Las Vegas buckwheat Least chub Loggerhead sea turtle (northern and Florida
population) Loggerhead sea turtle (northern Pacific
population) Loggerhead sea turtle (western North Atlantic
population) Longfin smelt Mexican garter snake Mexican spotted owl Mojave finge - toed lizard North American green sturgeon Northern Rockies fisher Northern sea otter Pacific fisher (federal) Pacific fisher (California) Pacific lamprey Pacific Northwest mollusks Pacific walrus Page springsnail Palm Springs pocket mouse Parish's alkali grass Polar bear Puget Sound
killer whale Queen Charlotte goshawk Relict leopard frog Ribbon seal Ringed seal River lamprey Rio Grande cutthroat trout Roundtail chub Sacramento Mountains checkerspot butterfy Sand dune lizard Sand Mountain blue butterfly Shivwitz milk - vetch Sierra Nevada mountain yellow - legged frog Sierra Nevada red fox Siskiyou Mountains salamander Sonora tiger salamander Southwestern willow flycatcher Spotted seal Spring pygmy sunfish Staghorn coral Tahoe yellow cress Tricolored blackbird Tucson shovel - nosed snake Virgin river spinedace Western brook lamprey Western burrowing owl (California) Western gull - billed tern Yellow - billed cuckoo Yellow - billed loon Yosemite toad
It's important to note that the gray
whale population along our coast is thriving, and gray
whale calves provide vital sustenance for transient
killer whales.
The North Island Kayak Four Day Orcas and the Humpbacks Sea Kayaking Adventure concentrates on the areas known to be the primary summer range of Northern Resident Orca (
killer whale)
population and the summer feeding grounds of an ever increasing number of Humpback
Whales.
During the months of July through September, the Johnstone Strait has the largest
population of Orcas (
Killer Whales) in North America.
The North Island Kayak Three Day Orca Sea Kayaking Safari concentrates on the areas known to be the primary summer range of Northern Resident Orca (
killer whale)
population.
Dr. Mike Bigg and his colleagues were working to develop new techniques to study
Killer Whales and would eventually conduct the first
population census ever on these animals.
British Columbia has the largest
population of Orcas (
Killer Whales) in the world so Canada
whale watching tours in BC are a favourite for fans of the incredible Killer W
whale watching tours in BC are a favourite for fans of the incredible
Killer WhaleWhale.
We've long speculated that the scarcity of sharks in the San Juan Islands is due to our concentrated
population of
killer whales.
The latest confirmed birth, recorded on February 21 in L - pod, brings the «southern resident»
killer whale community
population up to 89
whales.
The
killer whales»
population plummeted to 71 by 1973, climbed to 99 in 1995, then plunged again to 79 six years later.
The birth brings to 88 the
population of southern resident
killer whales that we enjoy seeing on our kayak tours in the San Juan Islands.
«The gray
whale population has gotten bigger over the last 20 years and the
killer whales have gotten better at hunting the gray
whale calves,» she said.
With huge metabolic demands — and large
populations before humans started hunting them — great
whales are the ocean's ecosystem engineers: they eat many fish and invertebrates, are themselves prey to other predators like
killer whales, and distribute nutrients through the water.
Scientists fear melting sea ice could one day make
killer whales the Hudson Bay's top predator, a startling ecosystem shift and a blow for Inuit
populations already reeling from dwindling polar bear numbers.
The Pacific - herring
population collapsed after the spill, and one pod of
killer whales had its
population cut by 40 percent.
If the Kinder Morgan pipeline were to go ahead without addressing impacts to marine species, including increased tanker noise, the Southern Resident
killer whale's
population's survival and recovery would be jeopardized and their critical habitat would be threatened.