Lirabuccinum dirum: Spindle whelk–The Race Rocks Taxonomy

RMdira

Dire whelk along with many other species of other phyla represented

Habitat: Middle intertidal zone on wave-washed, coralline-encrusted rocky shores. Can be found on protected outer coasts and quiet bays anywhere from Alaska, south to central California.
At
Race Rocks, they occur frequently in the mid to low intertidal range. They have often shown up in intertidal transects.

searlesia

A spindle Whelk beside two Tealia Anemone

Description: The Spindle Whelk has a thick, mainly grey shell with many spiral threads of varying sizes. The soft body of the animal is white. Shell is heavy; whorl sculptured with spiral grooves and 9 round, low axial swellings. The siphonal canal is short and coloured grey or brownish.
Additional Information: The spindle whelk is a scavenger that feeds mainly on injured animals. Prey can include littorines, snails, barnacles, worms and limpets. The Spindle Whelk’s proboscis can extend fully out of the shell which allows for gregarious feeding on large prey. Additionally, the proboscis permits the consumption of prey that are already being digested by the everted stomach of sea stars. Its main predator is the sea star. Spindle whelks are most active when submerged in calm water; otherwise it is a largely inactive animal. The longevity of the spindle whelk is unknown, however one which is 40 mm long could be 15 years or more in age.

taylorspindle

Taylor Hartrick finds a Searlesia right on the end of the Jetty.

Kingdom: Animalia
Phylum Mollusca
Class Gastropoda
Subclass Caenogastropoda
Superfamily Buccinoidea
Family) Buccinidae
Genus Lirabuccinum
Species: dirum

Formerly Searlesia dira

Common Name dire whelk or spindle whelk
Other Members of the Phylum Mollusca at Race Rocks.

Return 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. 

Date:2005 Taylor Hartrick

Elephant Seal Moulting

Race Rocks is at the northern limit of distribution of the Elephant Seal. They often number from 2 to 3 large males and 4 or 5 females. Arriving in January, they usually stay through the summer on the middle island and then leave for several months in the winter. Elephant seals often undergo a juvenile moult on the local beaches of Victoria when several years old. This individual may be at the end of such a moult as it still has a few sore spots on it’s coat. They end up on beaches where they wallow in the sand to keep the flies off. Members of the public often report them to the “authorities” as being diseased in appearance as their skin is blistered and raw. There has even been an example in the past few years in the local Victoria area when an animal in such condition was reported to the authorities as sick and due to ignorance, the animal was shot by an animal control officer. Of course this outraged some of some local residents who had been observing it for weeks as it was going through the moult, but the mistake had been made. So humans — leave well enough alone. Misguided intervention is not helpful for this rather rare pinniped

The video of this female elephant was videoed off the South side of Race Rocks. It was done in hi 8 – before we had SONY cameras that would record in Digital. One can see the patchy skin typical of the moulting stage just behind the head. This seal had probably already gone through the most serious part of the juvenile moult, which may have occurred on one of the sandy beaches over near Metchosin. The barking in the background is from California sealions. 

Stratified Tidal Flow over a Bump- Richard Dewey

doi: 10.1175/JPO2799.1
October, 2005,
Journal of Physical Oceanography: Vol. 35, No. 10, pp. 1911–1927.

Stratified Tidal Flow over a Bump
RICHARD DEWEY
School of Earth and Ocean Sciences, University of Victoria,
Victoria, British Columbia, Canada
DAVID RICHMOND AND CHRIS GARRETT
Department of Physics and Astronomy,
University of Victoria,
Victoria, British Columbia, Canada
(Manuscript received 8 October 2004, in final form 22 April 2005)

 

ABSTRACT: The interaction of a stratified flow with an isolated topographic feature can introduce numerous distur- bances into the flow, including turbulent wakes, internal waves, and eddies. Measurements made near a “bump” east of Race Rocks, Vancouver Island, reveal a wide range of phenomena associated with the variable flow speeds and directions introduced by the local tides. Upstream and downstream flows were observed by placing two acoustic Doppler current profilers (ADCPs) on one flank of the bump. Simulta- neous shipboard ADCP surveys corroborated some of the more striking features. Froude number conditions varied from subcritical to supercritical as the tidal velocities varied from 0.2 to 1.5 m s1. During the strong ebb, when the moored ADCPs were located on the lee side, a persistent full-water-depth lee wave was detected in one of the moored ADCPs and the shipboard ADCP. However, the placement of the moorings would suggest that, by the time it appears in the moored ADCP beams, the lee wave has been swept downstream or has separated from the bump. Raw ADCP beam velocities suggest enhanced turbulence during various phases of the tide. Many of the three-dimensional flow characteristics are in good agreement with laboratory studies, and some characteristics, such as shear in the bottom boundary layer, are not.

Dewey-RG-Bump-JPO2799

See the full version of this paper at:

ftp://canuck.seos.uvic.ca/papers/Dewey-RG-Bump-JPO2799.pdf

Canadian Geographic Kids Program

The CBC TV crew accompanied us on a dive to Race Rocks in order to video a sequence that later was used on the nationally televised Canadian Geographic Kids program.

Installation of Succession plates for the Tidal Energy project

This video shows the installation process for the tidal energy generator research project. This was carried out by Chris Blondeau and the Pearson College Divers in order to determine which surfaces discouraged growth in the waters at Race Rocks. As a result, Titanium was used in the construction of some parts of the generator as it was one of the metals most resistant to fouling.

See other archived video with Pearson College Divers

Link to the Integrated Energy Project

Caprella laeviuscula: Caprellid shrimp– The Race Rocks Taxonomy

We found these Caprellids at a depth of 20 metres attached to hydroids on a Balanus nubilus. They frequently dwell amongst hydroids. The size of this individual was 3mm. These individuals were photographed using a Motic Digital Microscope at 10X magnification. Note the response to stimulation by a dull probe.

In the picture below , the current meter float which was in the water for a year, came up covered with Caprellids. See this file on the Current meter:

Look closely to see these tiny skeleton shrimp clinging to bryozoans, hydroids or algae. Their body shape and color help the shrimp to blend into their background. Their bodies are long, cylindrical and range from pale brown and green to rose. Some species can quickly change color to blend into their backgrounds.

Skeleton shrimp look like, and sometimes are called, “praying mantises of the sea.” They have two pairs of legs attached to the front end of their bodies, with three pairs of legs at the back end. The front legs form powerful “claws” for defense, grooming and capturing food. The rear legs have strong claws that grasp and hold on to algae or other surfaces. They use their antennae for filter feeding and swimming.

Diet
diatoms (microscopic plants), detritus, filtered food particles, amphipods 
Size
to 1.5 inches (4 cm) long 
Range
low intertidal zone and subtidal waters in bays,

Conservation Notes

Skeleton shrimp are abundant and live in many habitats, including the deep sea. They play an important role in the ecosystem by eating up detritus and other food particles. 

Cool Facts

Shrimp, sea anemones and surf perch prey on skeleton shrimp. The females of some skeleton shrimp species kill the male after mating. 

Skeleton shrimp use their front legs for locomotion. To move, they grasp first with those front legs and then with their back legs, in inchworm fashion. They swim by rapidly bending and straightening their bodies. 

To grow, skeleton shrimp shed their old exoskeletons and form new, larger ones. They can mate only when the female is between new, hardened exoskeletons. After mating, the female deposits her eggs in a brood pouch formed from leaflike projections on the middle part of her body. Skeleton shrimp hatch directly into juvenile adults.

Source: Monterey Bay Aquarium:
Online Field Guide http://www.mbayaq.org/efc/living_species/default.asp?hOri=1&inhab=521

Other Members of the Phylum Arthropoda at Race Rocks.

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. This file was originally started by Kevin Mwenda PC Yr 31

Deploy and Retrieve ADCP Instrument 2005

In order to predict the best location for the installation of the tidal power generator, an ADCP ( Acoustic Doppler Current Profiler) supplied by ASL Environmental Sciences was deployed. This instrument will collect current regime information for a period of one month. Rita Santos did the video and Angie Karlsen helped Chris Blondeau lift and position the concrete weights used to secure the device on the sea floor..

See other archived video with Pearson College Divers

Hinnites giganteus: The purple-hinged rock scallop

scallopnumbered

Hinnites giganteus, the purple hinged rock scallop with associated organisms,  (sponges, barnacles, hydroids etc.)

hinge

This is the “purple hinge” on an open shell of a rock scallop. It is almost obscured by the growth of other invertebrates. The yellow spots are from a parasite, the boring sponge, Cliona sp.. The white anemone is Metridium sp .The snail is Calliostoma sp.

Other Members of the Phylum Mollusca at Race Rocks.

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.   G.Fletcher 2005

 

Air Temperature Effects on organisms at Race Rocks

The abiotic effects of air temperature
on the distribution of organisms at Race Rocks.

In this video we discuss the effects on diatom growth from the increasing temperature which results from the increasing levels of solar energy in the early spring in the upper intertidal zone on Great Race Rocks.

 

Preliminary Screening: BC Parks Impact Assessment

                                                                                                               File No:   85700-35/0210206

BC Parks Impact Assessment Process

Level 1, Preliminary Screen Report

(See Users Guide, pp. 9 to 12)

Name of Action:       Expand generator shed for battery storage for Current Turbine Project  

Proponent:               Lester B Pearson College

Review Date(s):         March 17,05                                                                Page:  1of 3

A. Issues and Environmental Components

  1. List any issues of concern that have been or may be raised by BC Parks, other government agencies, First Nations, or the public.

Impacts of expanding sidewalk footprint. Impact on nesting birds.

ie: Construction should take place when birds aren’t nesting.

No habitat loss should take place.

Impacts that could potentially be damaging to other wildlife and plant communities as a result of  demolition/construction activities.

  1. Identify any geographic “hotspots” at or close to the proposed action (e.g., areas of high use, concentrations of facilities, wilderness conservation zones, unique landscape features).

The proposed footprint of the engine room expansion is represented below. Note the sidewalk extension is made more clear in following diagrams.

This would accommodate the floor plan represented following:
The outside wall with the double door in the technical diagram is the part that would occupy the small white square above.

This would accommodate the floor plan represented following:
The outside wall with the double door in the technicall diagram is the part that
would occupy the small white square above.

  1. Identify any important environmental, recreational, social or economic values in the area of the proposed action and/or the area surrounding the proposed action (e.g., rare or endangered species, hiking experience, midden site). Include a rationale as to why the value is considered important.

Ensure no endangered or rare plant species or other habitat is lost as a result of expansion of sidewalk. Reduce size to minimum needs.

This area has been surveyed on April 6 /05 by Pam Thuringer of Archipelago Marine and she has indicated there are no endangered plant species therein. Most of the grasses are introduced species, with a few invasive species. None of the rock outcrop up the slope is impacted by this extension.

“I have recommended that the sod that is lifted, should be transplanted to another area of the island, for instance to a corner of the top of the concrete covered cistern, which could support a grass community if  adequate soil depth was restored, or other areas which currently have concrete which could be moved such as the “sidewalk to nowhere!” below, located by the boat shed.   I think that restoration of this 17 by 4 foot area would be a suitable mitigation for the impacted area by the engine room, as it adds habitat in an area more suitable for nesting. ”
(Garry Fletcher)

Preliminary Screen Checklist Page:  2of 3

Complete the following based on information available and/or the experience of BC Parks staff at the time of the review.

  1. BC Parks has a responsibility to comply with the following Acts and regulations. Indicate that the proposed action complies with the following: Done ( or N/A)
    Park Act, Park Amendment Acts Yes
    Ecological Reserve Act Yes
    An order issued under the Environmental Land Use Act n/a
    BC Environmental Assessment Act n/a
    Waste Management Act n/aHeritage Conservation Act (i.e., Archaeological Impact Assessment Guidelines) n/a
    Federal Fisheries Act (Department of Fisheries and Oceans) n/a
    Other (specify):
    Comments:
    BC Parks should ensure that all actions comply with BC Parks policies. Indicate that the proposed action complies with the following: Done
    Approved management plan or management direction statement (MDS)Yes
    BC Protected Areas Strategy: Resource and Recreation Use Guidelines for Protected AreasYes BC Parks Policy including conservation and recreation goals (Striking the Balance) Yes
    BC Parks Policies (specify):Eco reserves set aside for protection and research Yes
    BC Parks ConservationProgramPolicies yes
    BCParksAnnualManagementPlan (i.e.,valuesandtargets)n/a
    Other (specify):
    Comments:
    Page:3 of 3 3.
    Document which agencies /stakeholders that have been or should be notified and/or contacted: yes” Done ( or N/A)
    Conservation Data Centre n/a Ministry of SRM (specify branch):
    Ministry of Forests (i.e., Range Act) n/a

Ministry of Energy and Mines (Mineral Tenure Act) n/a
Ministry of Health Services n/a>
First Nations Yes
Agencies responsible for broader level plans (i.e., Regional District, LRMP) n/a
Other (specify):
Comments (include name and title of contact):
The proposed action is likely to result in the following impacts (check all that apply) Done
(U or N/A)

Adverse and permanent effects on the important conservation, recreation and/or cultural heritage values n/a

Adverse and permanent effects on the character and aesthetics of the protected area n/a

Adverse effects to endangered, threatened or vulnerable or regionally significant species, populations and  habitats (i.e., red/blue-listed species/habitats, biogeoclimatic representation) U

Adverse effects to critical or geographically unique characteristics U

Adverse effects to public health and safety n/a

Adverse effects to traditional use of the area by First Nations n/a

Adverse effects to local communities n/a

Adverse effects to the recreational use or enjoyment of the park (regardless of the intended benefits of the proposed action) n/a

Economic implications, such as operating costs, that cannot be maintained over time n/a

 A high level of controversy or public concern regarding the action n/a

Effects of the action, which when combined with the effects of other actions in the region, may result in cumulative impacts n/a

Implications which may be precedent-setting and should therefore be considered in the context of similar future actions n/a

Comments (use corresponding letters to refer to specific impacts listed above):

  1. Level 1 report should recommend appropriate times and methods for construction to ensure birds /wildlife impacts are kept to a minimum.

The window of work for the sidewalk construction will be in the next few weeks. It is scheduled to start on April 18, well before the onset of nesting in late May. We have given the end of April as a deadline for the sidewalk extension and any other on land work that may compromise the bird nesting habitat to be completed.

Concrete will be made on site from materials transported to the island.

  Garry Fletcher and /or Chris Blondeau will be on site to oversee the environmental concerns and Brian Emmett and Pam Thuringer and staff of Archipelago Marine have been contracted to do an ongoing environmental assessment for the duration of the construction phase of the project during the next year.

  1. An on ground review of proposed sidewalk location and reduced sidewalk footprint recommended.

See photos above.