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Sea Lions Dangerous

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Last Updated: 02 July 2021

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On land they are Jabba Hutt impersonators from the Star Wars film sagas. When see swimming under water, it's as though graceful, fur - covered refrigerator has suddenly become Star in water ballet. Yes, Steller Sea Lion is a beast of beauty to behold - unless you are uncomfortably close in kayak. First and foremost, we are talking about the Steller Sea Lion, stellar member of a family that includes cuddly seals, flesh - ripping Sea wolves and lumbering, proboscis swaying Sea elephants. Size - wise, Steller Sea Lion is as much bigger than the common California Sea Lion as those west coast creatures are to common seals. Clearly, Sea Lions of North Pacific are potential water hazard that's always on the move and occasionally up to the challenge of proprietorship as to whose chunk of ocean it is at any one time. Sea Lion hangouts Sea Lions that hang out in marinas and harbor areas are said to be habitualized. That is, they are used to being around humans and their noises and movements. Whether sunning on marker buoy or commandeering section of dock, habitualized Sea Lion is most approachable. That say, it must be understood that these guys are still absolutely wild! Most skippers will whip past colony of sunning Sea Lions as fast as reduced wake speeds will allow, animals rarely lifting so much as eyebrow. Try to quietly drift up to that same group in kayak and all heck can break loose. Seem contradictory, doesn't it? My theory is that Sea Lions are used to noise, direct approach and lack of interest as normal. The stealth - like approach of small, hard - to - see - craft, however, may signal caution to wary Sea Lion. Some have pointed out that this is recessive instinctual behavior back to days when they were hunted by kayakers. I personally doubt it. I think it's more out - of - ordinary movements that disturb them. In fact, we usually chatter and paddle normally right up to snoozing Sea Lion cow as though we were visiting neighbors - causing nary a grunt of disapproval. Once those Sea Lions move out to coastal rookeries and hauling out areas, it's another story. Sentries at edges of haul - out rocks or beaches are quick to raise ruckus if something unknown - even another group's Sea Lion - comes in too close. We are taught, as respectful wards of nature, not to approach animals too closely. That works in parks and other border areas of defined wildlife colonies. However, further into the wilderness realm we travel more often are we going to experience close encounters of surprising kind! It's not uncommon for seals and their larger kin to approach boats to see what's going on. Seals are known to frolic on kayak, arching from side to side in boat, paddle tip to paddle tip.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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Othv - 1 was detected in genital epithelial samples of 3. 5% of pups and in 33. 3% of adult females. Dpol sequences generated from OtHV - 1 PCR products share high nucleotide similarity indexes with sequences previously report. Genital epithelium of 57. 89% of pups sampled were classified as negative for intraepithelial malignancies. Genital epithelium of 21% of pups was classified as ASC, 15. 79% as LSIL and 5. 26% as ASCUS. Genital epithelia of two of three adult female samples were categorized as LSIL. None of the 60 samples show evidence of HSIL. Thirty - three pups and three females had at least one of the following transformed cell types: koilocytes, binucleated cells and reactive cells, with varying numbers of each. Of these, most prevalent in pups were reactive cells followed by binucleated cells and koilocytes, while adult females had higher numbers of koilocytes. Intranuclear inclusion bodies were present only in two of the sample sea lion pups and in one of the adult females. None of these individuals were positive for OtHV - 1. The severity of inflammation increases with age. Some cellular phenotypes vary with age. Specifically, number of normal epithelial cells decreases with age, while koilocytes increase with age. Binucleated cells increase when pups are older, and decrease again in adult females. The occurrence of moderate and marked inflammation increases with age. There were no intersex differences in the number of transformed cell types of pups for each age class; however, number of normal epithelial cells tended to be higher in male pups. When examining each pup age class separately, males had more normal epithelial cells than females at 6 - 8 weeks of age and at 18 - 20 weeks of age. Infection by OtHV - 1 was not associated with any of cell types or diagnostic category, nor was it related to the number of lymphocytes and neutrophils found in cervical smear. Atypical squamous transformation was more common in animals whose genital epithelium was marked and severely inflamed, and this pattern held when excluding adult females from analysis. When examining this relationship in terms of number of lymphocytes and neutrophils, sea lions with ASCUS tend to have more lymphocytes but not more neutrophils than normal individuals. Pups constitutive Zaca DRB multiplicity range from 6 to 10 genes. The diversity of APC - express Zaca DRB genes ranges from 3 to 10 loci. Neither constitutive Zaca DRB gene multiplicity nor express Zaca DRB gene multiplicity explain the occurrence of LSIL, ASCUS and ASC. Presence or absence of specific Zaca DRB genes does not influence any cellular phenotypes or diagnostic categories. Similarly, individual expression of Zaca DRB genes does not appear to play a significant role in the occurrence of any of abnormal cytological diagnostic categories, nor does it influence the number of abnormal cell types except for Zaca DRB - D, which show protective effects.

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The Harbinger

These mammals have thick spindle - shaped bodies that are covered in short black or brown fur. Their heads are slightly long and have large earflaps on the side. They may appear on your boat from time to time. Sea lion's legs are more developed than those of seals, which enable them to walk on land. Each has five web fingers on end. Males also have thick pelts of hair around their necks. Being highly polygamous, males will often lead herds composed of themselves and ten or more females. Males then patrol territory to ensure that no rival males approach and that females don't attempt to leave. This sea lion's short fur can be glossy black or matte brown. Each male has a distinctive mane around its neck. With five webbed digits on its legs and flippers more developed than those of other sea lions, it can also move nimbly on land. It is polygamous, with the male creating a harem of over 10 females. Because of this, men patrol to protect against others encroaching on their turf.

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* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

The Accused

It is undeniable that Sea Lions impact the steelhead population by capitalizing on advantages afforded by locks. Wildlife managers estimate animals consumed between 42 and 65 percent of total steelhead run between 1986 and 1992. Yet steelheads had been in decline in parts of Puget Sound long before Herschel boldly poked his whiskered snout up to foreign structure and discovered nirvana. Models suggest that historical steelhead run in Puget Sound maxed out somewhere between 409 000 and 930 000 fish. Fishery likely peaked in 1895 with 204 600 steelhead caught, but such heavy harvest was unsustainable. Just three years later, Washington State Fish Commission estimated that runs had dropped by half. When predatory animals go from being rarity to commonplace, people struggle to adjustand it is especially hard if we watch them compete for depleting resources. Sea Lions often consume their meals on the surface, which is unfortunate for their public image. We tend to want to blame things on the surface, but would anyone think to start blaming hake, pollock, sculpins? Say Andrew Trites, director of the Marine Mammal Research Unit in Institute for Oceans and Fisheries at University of British Columbia. Those are all species that may be feeding on juvenile fish. We tend to come up with simple narratives: when salmon are down, it must be the fault of something we see. Sea Lions share their scapegoat status with numerous other fish eaters. In Atlantic Canada, cod stocks have barely begun to rebound from collapse in the 1990s despite a fishing moratoriumand fishing community blames cod - hungry gray seals. The Canadian government responded in 2012 with a bounty system designed to wipe 70 000 gray seals out of the Gulf of. Lawrence, though 2011 study by Fisheries and Oceans Canada biologists found that seals have been frame: slow recovery is more likely linked to shortage of capelin, cod's primary food. Killer whales, too, have been in the crosshairs. In the early 1960s, Canadian Fisheries department mountain a. 50 - caliber machine gun along Seymour Narrows north of Campbell River, British Columbia, with the intent of shooting whales to save more salmon for anglers. No shots were ever fire, said Trites. But that wasnt due to human restraint: as the story go, it was because no whales happened to come by that summer, and the plan was to abort. The role whales play in declining fish stocks has also been used as justification for countries such as Iceland, Norway, and Japan to continue hunting whales. This year, Norway announced it would raise its quota of whales to 1 278 from 999, despite an international moratorium on practice. Cormorants, river otters, mink, and salmon sharks are few of other animals that have been scapegoats. And, more recently, seals have been labelled villains in case of disappearing chinook salmon in British Columbia, with some people demanding cull while overlooking myriad other factors in declinewarming waters, pollution, and fishing pressures, for example.

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* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Herschels Legacy

A Group of Partners working to improve Salmon stocks have deployed a newly developed device on the west side of Ballard lock that uses Underwater Sound to keep Harbor seals away from this Salmon migration bottleneck. If effective, device may help salmon populations in jeopardy by reducing predation without harming marine mammals. The US Army Corps of Engineers and Oceans Initiative, with support from Long Live Kings, University of Andrews, Genuswave, Puget Sound Partnership, Washington Department of Fish and Wildlife, Muckleshoot Indian Tribe, and other partner organizations have deployed target Acoustic Startle Technology on the West side of Ballard lock. It is intended to keep harbor seals away from fish ladder allowing salmon to reach Lake Washington Ship Canal from Puget Sound. Seals and Sea lions are known to linger at this migration bottleneck and consume large numbers of salmon returning to spawning grounds. If successful, device may help recover dwindling salmon runs, without harming marine mammals. We are always looking for new innovations to help the environment, says USACE spokesperson Dallas Edwards. We are excited to see the results of this study. Every salmon and steelhead originating from the Sammamish or Cedar River must pass through Ballard Locks twice during its life, once as young smolt and again as an adult. With limited routes to get through locks, salmon are funnelled through small area. This makes an easy meal for some marine mammals that use this human - made obstacle to their advantage. Over the past 50 years, observers have also seen a spike in marine mammals near Locks, compounding significant habitat declines over the past century across Watershed. This combination of factors has led to the lowest returns of salmon and steelhead in history, resulting in fishery closures and populations on edge of extinction. During summer and fall salmon migration, area is being monitored by scientists from Oceans Initiative, SEATTLE - base Marine Conservation research nonprofit. Scientists are observing marine mammal behavior when the device is on and comparing that with their behavior when the device is off. Everyone at Oceans Initiative is excited about seeing whether this benign use of Acoustic Technology can protect Endangered Salmon, without harming seals, says Laura Bogaard, who is leading data collection at Locks. During the first week of observing with TAST on, it felt like seals had shifted away from the fish ladder compared to observation days when TAST was off. We are keen to see if this observation is also reflected in our data when it comes time for analysis. If the device is effective at reducing the presence of Marine mammals at locks, it may then be deployed at other locations in Puget Sound, giving resource managers a sorely needed tool to prevent Marine mammals from consuming large numbers of salmon and steelhead at migration bottlenecks.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Littering

Studies done on female sea lions who miscarry their pups show higher levels of strong pesticide, known as DDT, than those who carry their pups to term. Along with pesticides, heavy metals are also a serious problem. Litter from marine boats, such as netting and plastic containers, also poses a serious threat to the Sea Lion population. Sea lions may become tangled in netting, or ingest litter, causing obstructions and other internal injuries. Becoming entangled in plastic can lead to drowning, as sea lions are mammals that can only stay under water for a maximum of ten minutes.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Appearance

Table

Age ClassMaleFemale
Pup< 1 year< 1 year
Weanern/a (weaned ~6-9 months)n/a (weaned ~6-9 months)
Yearling1-2 years1-2 years
Juvenile2-4 yearsn/a (classified as subadults)
Subadult4-8 years2-5 years
Adult8+ years5+ years

California sea lions are known for their intelligence, playfulness, and noisy barking. Their colors range from chocolate brown in males to lighter, golden brown in females. Males reach 850 pounds and are seven feet in length. Females grow to 220 pounds and up to six feet in length. They have a dog - like face, and at around five years of age, males develop a bony bump on top of their skull called sagittal crest. The top of a male's head often gets lighter in color with age. These members of the otariid or walking seal family have external ear flaps and large flippers that they use to walk on land. Trained seals in zoos and aquariums are usually California sea lions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

Sources

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions.

* Please keep in mind that all text is machine-generated, we do not bear any responsibility, and you should always get advice from professionals before taking any actions

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