Phocoenoides dalli: Dall’s Porpoise–The Race Rocks Taxonomy

PB_Dalls2Porpoises diving in the rip current just west of the main Island. Photos taken by Pam Birley on the remote camera 5 November 30, 2006

Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Cetacea
Suborder: Odontoceti
Family: Phocoenidae
Genus: Phocoenoides
Species: P. dalli
Dall’s Porpoise
Other Members of the Class Mammalia at Race Rock

taxonomyiconReturn to the Race Rocks Taxonomy
and Image File
pearsonlogo2_f2The Race Rocks taxonomy is a collaborative venture originally started with the Biology and Environmental Systems students of Lester Pearson College UWC. It now also has contributions added by Faculty, Staff, Volunteers and Observers on the remote control webcams.  Garry Fletcher 2006

 

Large wave day, Minke Whale observed

Friday, November 02, 2001
Good evening
WEATHER: Max. 10.7ºC — Min 7.5ºC — Reset 8.1ºC Rain 0.4 mm Wind was light and variable. It was a great day to be on the rock.
Although the sea was fairly calm, the 4-6′ swells coming in from the west and piling up to 10-12′ green and white frothy curls on the underwater reefs made for great wave watching!
MARINE LIFE: The birds continue to feed in in large numbers but impossible to count because of the glare on the sea.It was also impossible to positively identify a whale that looked like a 18-20′ Minke Whale even with the telescope, because of the glare and distance.2 of the 4 Northern Elephant Seals regularly hauling out in various areas of Gr. Race spent several hours on the boat ramp enjoying the sun.
HUMAN INTERACTION: There were 5 tour boats and one pleasure craft (4 metre sailboat) in the M.P.A. today.posted by Carol or Mike S at 7:20 PM
Good morning
Sky part cloudy — Vis. 15 miles — Wind west 14 knots — Sea 1 – 2 foot chop
posted by Carol or Mike S at 7:17 AM

Orca Skeletal Mount at Pearson College

The Finished product of the work of skeletal preparation of L51 is now  suspended above the lab benches in Catrin Brown’s Biology Lab. The mount was made by students and Hans Bauer, a former faculty member who volunteered for the job, along with Hugo Sutmoller.

See the flensing of the orca L51 by Pearson College students

 

 

 

A serious contaminant of Orcas in the southern Vancouver island area is PCBs. Male Orcas accumulate these chemicals throughout their life, whereas females are purported to increase in levels until a birth, whereupon the levels in the tissue drop as a result of lactation.

For more information on contaminants in the Orca Food web, see the following Link:

Is Victoria Sewage Contaminating Southern Resident Killer Whales?
A Technical Submission to the SETAC Victoria Sewage Scientific and Technical Review Panel
By Gerald Graham, Ph. D. Marine Environmental Consultant
On behalf of the T. Buck Suzuki Environmental Foundation

 

Eschristius robusta : Gray Whale– Race Rocks Taxonomy

n November 1990, students and faculty took on a project of preparing and mounting the skeleton of a Gray whale that had been found floating near shore, dead in the Strait of Juan de Fuca, West of Race Rocks.

Even after retrieving the bones to the docks, they had to sit for some time and many students helped in the slow and arduous task of removing the last bits of connective tissues that clung to the bones. While the decomposing remains were anchored to the shore, two large vertebrae were removed by some fishermen. They were traced and eventually recovered but they show up now as slightly yellowed and cleaner. (Probably from the bleach used to clean them.)

Finger mould

The Fiberglass finger bone on the left hand was made from the one on the right hand. This task took some time as the liquid rubber had to be painted on in many layers, each being allowed to dry. The final results are visible as slightly white looking fiberglass replacements on the skeleton. The largest bone that we lost was in the neck region. A concrete replacement was made for it from the clay replica moulded by Siegmar Zacharias . At this time Sylvia Roach became the faculty contact for the group of six students working on the whale as an activity. The work progressed slowly during the fall as the process of getting all the bones cleaned and then sealed was a demanding one. In the second term, two students, Jody Snowden and Becky Macoun persisted and contributed many hours of time to see it through the final stages of mounting. They also assisted Gary Stonely with the welding, cutting, polishing and painting of the metal parts.

Our former administrator, the late John Davis was instrumental in promoting the project. In addition to taking the photographs in the display case, he was responsible for securing a grant of $5000 from the Ministry of Advanced Education of the Province of British Columbia to enable us to complete the project.

Two species of Arthropod lived parasitically on the whale’s skin. The Gray Whale barnacle, Cryptolepas rachianecti .  Also, The Gray Whale Lice Cyamus kessleri was located on the skin.

THE MOUNTED GRAY WHALE SKELETON AT PEARSON COLLEGE

Gray Whale Skeleton , Eschristius robusta at Lester B. Pearson College.. (with Alex Fletcher)

INGI FINNSON (PC-Year 25) took this series of closeup photos for a project being done by a scientific artist:

Domain Eukarya
Kingdom Animalia
Phylum Chordata
Class Mammalia
Order  Cetacea
Sub Order Mysticeti
Family Eschrichtiidae
Genus Eschrichtius
Species robustus
Common Name: Gray whale

Title: Taxonomy of the gray whale

Description:
Gray whales have mottled gray skin which sometimes seems to look slate-blue or marbled white and its head arches between its blowhole and snout – grey whales have relatively small heads. They don’t have a dorsal fin; instead there is a low hump with between 6 and 12 knuckles between the hump and the tail. Their flippers are small and paddle-shaped. Their baleen plates are about 50cm in length. Gray whales have what look like yellow spots on their skin, these are, in fact, small parasitic crustaceans. Many cetaceans are infested with these although not always the same type – some parasites live on only one type of whale. The gray whale is more heavily infested with a greater variety than any other cetacean. They do not seem to harm the whale in any way although when they leave the whale’s skin in warmer waters it still shows the scar.
Yankee whalers named the gray whales “devilfish” because they were so protective of their young when approached, often charging or attacking whalers. Today, they are better known for being not only one of the most active of the large whales but also one of the most inquisitive and friendly.

• The scientific order Cetacea includes all whales. This large order is further divided into three suborders: the toothed whales or Odontoceti (killer whales, dolphins, porpoises, beluga whales, and sperm whales), the baleen whales or Mysticeti (blue whales, humpback whales, gray whales and right whales), and the Archaeoceti (which are all now extinct).
• The word “cetacean” is derived from the Greek word cetus, which means whale.
Suborder–Mysticeti.
• The term “baleen whale” is another name for the scientific suborder Mysticeti.
• The word Mysticeti is derived from the Greek word for moustache, mystax. It may refer to the hairy appearance of the baleen plates, which baleen whales have instead of teeth. Baleen whales have two external blowholes and are larger in size than most toothed whales.
• Baleen whales are sometimes referred to as the “great whales.”
Family– Eschrichtiidae
• This family has one living member, the gray whale. The gray whale has a few throat grooves, short baleen plates, and a small dorsal hump followed by a series of bumps.
Trophic level:
Because of their relative size, gray whales are usually at the top of the food chain:
Main danger to whales:
Ed note : since this was written , there is a greater recognition now of the danger to whales by ship strikes and ship casued noise in the seascape which interferes with the whales echolocation
• Whalers, who kill whales to sell their meat.• Human activities such as pollution. Currently( 2006, both Japan and Norway still pursue whales ( Minke and others) under the guise of scientific whaling. Japan harvests several hundreds from the waters of the Antarctic, and Norway gets theirs from the North Sea.

(Chinyere Amadi PC Yr 31  2005)

taxonomyiconReturn to the Race Rocks Taxonomy
and Image File
pearsonlogo2_f2The Race Rocks taxonomy is a collaborative venture originally started with the Biology and Environmental Systems students of Lester Pearson College UWC. It now also has contributions added by Faculty, Staff, Volunteers and Observers on the remote control webcams.

Victoria’s killer Whale Early Warning System Dec 1986.

By Robin Baird –From The Cetacean Watch Newsletter , Dec 1986.
A discussion of Victoria’s Killer whale early warning system, and the installation of the first hydrophone at Race Rocks.

robin

Marcus Pistor ( PC student) Pam Stacey and Robin Baird installing the hydrophone cable on the south-east side of Great Race Rock.

cetacean

Social organization of mammal-eating killer whales: group stability and dispersal patterns

by Robin W. Baird and Hal Whitehead
See the full PDF:KWSocOrg
Abstract
: The social organization of mammal-eating “transient” killer whales (Orcinus orca) was studied off southern Vancouver Island from 1985 through 1996. Strong and long-term associations exist between individual transients, so sets of individuals with consistently high association levels, termed pods, can be delineated. Pods consist of individuals of mixed ages and sexes, and typically contain an adult female and one or two offspring (averaging 2.4 individuals). The mother–offspring bond remains strong into adulthood for some male (and less often for female) offspring. Other males disperse from their maternal pod and appear to become “roving” males, spending some of their time alone, and occasionally associating with groups that contain potentially reproductive females. These males appear to have no strong or long-term relationships with any individuals, and adult male – adult male associations occur significantly less often than expected by chance. Females that disperse from their natal pod appear to be gregarious (having high average association rates) but socially mobile (having low maximum association rates). Differences in social organization from the sympatric fish-eating “resident” killer whales (where no dispersal of either sex occurs) likely relate to differences in foraging ecology. Transient killer whales maximize per capita energy intake by foraging in groups of three individuals,whereas no such relationship has been documented for resident killer whales