Category Archives: Video

Solmissus marshalli –The Race Rocks Taxonomy

Posted on by
solmissus

Solmissus sp. taken from the video linked below.

Solmissus marshalli lives in the midwater zone of seas. It feeds by swimming slowly with its tentacles stretched out. When animals bump into the tentacles, stinging cells fire and hold on. Depending on the size of the prey, it can take a jellyfish up to two hours to move food from its tentacles to its stomach. The jellyfish feeds on gelatinous animal plankton, other jellies and copepods. It is a secondary consumer.

In this video you can see two different species of jellyfish, Solimissus marshalli and Mitrocoma cellularia. These invertebrates are part of the phylum Cnidaria which include hydroids, scyphozoan jellyfishes, sea anemones, sea pens and corals. They are constructed of 2 layers of cells-the outer covering and the inner covering of the digestive cavity. Between is a jellylike layer (mesoglea). Some cells are specialized for digesting or stinging. The jellyfish is the sexual ‘medusa stage’ of a hydroid. The hydroid medusa has a membrane (velum) that grows inward from margin of the bell. Most of the 60 or so local jellyfishes are medusaes of hydrozoans; surprisingly very attractive, but usually very small and they often go unnoticed. These specimens were videoed by Jean-Olivier Dalphond and Damien Guihen on a sunny day of June 2001. Identification was by Dr. Anita Brinckmann-Voss. Anita regularly samples the waters of Race Rocks as well as nearby Eemdyck passage, Beecher Bay , Pedder Bay and Sooke harbour where the upwelling water from the Strait of Juan de Fuca often brings numerous medusae.

Species recognized by World Register of Marine Species (WoRMS) Biota Animalia

Cnidaria

Hydrozoa , Owen

Narcomedusae Haeckel 1879

Cuninidae Bigelow 1913

Solmissus

Solmissus marshalli Agassiz & Mayer, 1902

See this link for other hydroids:  https://www.racerocks.ca/tag/hydroid/
Other Members of the Phylum Cnidaria 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. 

Lester B. Pearson College:
2005 Debra Quek PC Yr 31

 

 

Mitrocoma cellularia : jellyfish – Race Rocks Taxonomy

Posted on by

mitrocoma

Mitrocoma cellularia


In this video you can see two different species of jellyfish, Solimissus marshalli and Mitrocoma cellularia. These invertebrates are part of the phylum Cnidaria which include hydroids, scyphozoan jellyfishes, sea anemones, sea pens and corals. They are constructed of 2 layers of cells-the outer covering and the inner covering of the digestive cavity. Between is a jellylike layer (mesoglea). Some cells are specialized for digesting or stinging. The jellyfish is the sexual ‘medusa stage’ of a hydroid. The hydroid medusa has a membrane (velum) that grows inward from the margin of the bell. Most of the 60 or so local jellyfishes are medusaes of hydrozoans; surprisingly very attractive, but usually very small and they often go unnoticed. These specimens were videoed by Jean-Olivier Dalphond and Damien Guihen on a sunny day of June 2001. Identification was by Dr. Anita Brinckmann-Voss. Anita regularly samples the waters of Race Rocks as well as nearby Eemdyck passage, Beecher Bay , Pedder Bay and Sooke harbour where the upwelling water from the Strait of Juan de Fuca often brings numerous hydroid medusae. 

From NCBI taxonomy

See this link for other hydroids:  https://www.racerocks.ca/tag/hydroid/ Link to the Race Rocks Taxonomy index

This file is provided as part of a collaborative effort by the students, faculty, staff and volunteers  of 
 Date:
2005		 Garry Fletcher

Installation of Succession plates for the Tidal Energy project

Posted on by

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

Deploy and Retrieve ADCP Instrument 2005

Posted on by

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

Air Temperature Effects on organisms at Race Rocks

Posted on by

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.

 

Rostanga pulchra :The Race Rocks Taxonomy

Posted on by

It is almost always found in association with the red encrusting sponge Ophlitaspongia

Physical Description:
The red sea slug is oval and commonly recognized by its bright color either red, orangish, or scarlet. But it is not uncommon to find some lighter colored species. It matches the texture and color of the sponge that it feeds on. Its body usually measures from 10 to 30 millimeters long. The back of some of the specimens can be covered with sprinkling black specks that stand out more in lighter colors. Their dorsum is covered with caryophilletic tubercules, which gives it a velvety texture. Their unique feature is their rhinophores (organs of the smell) that have vertical perfoliations.
Global Distribution: The red sea slug is dispersed all throughout the Pacific coast of North America from Alaska south to Argentina and Chile. Concentrated especially in Vancouver Island (British Columbia) and Puertecitos (Baja California)
Habitat: They are usually found on the colored red siliceous sponges they feed on, that are encrusted under rocky edges.

Feeding:
Rostanga pulchra feeds on red sponges. Ophlitaspongia pennata, Esperiopsis originalis, Plocamia karykina, and also on Acarnus erithacus and Isociona lithophoenix. It can locate the food from distance by scent. It first removes the top part of the sponge to leave a shallow groove.

Predators:
The predaceous cephalaspidean Navanax intermis can be reppelled by the Rostanga by non-acid secretions.

Reproduction:
The red sea slug is oviparous. The color of the eggs is similar to the color of the slug as well as the one of the sponge. It breads year round. The cylindrical eggs strands (2,000 to 13,000 egg capsules) are laid in a spiral pattern on the sponge they feed upon. The egg development is influenced by temperature: the warmer the shorter the development is. The eggs then develop into a larvae called veliger and drifts as plankton in the sea. The larvae will then settle and metamorphose in a suitable environment.
One interesting Fact: Like all nutribranchs, the Rostanga pulchra is hermaphrodite, which means that it has both female and male sex organs, thus their chances of meeting a potential mating partner increase. But self fertilization remains very rare.

References:
<oceanlink.island.net/oinfo/nudibranch/nudibranch.html>
<http://www.seaslugforum.net/display.cfm?id=9337>
<slugsite.us/bow/nudwk379.htm >
<www.calacademy.org/research/ izg/SFBay2K/Rostanga%20pulchra.htm>
<people.wwc.edu/…/Mollusca/GastropodaOpisthobranchia/Nudibranchia/Doridacea/Rostanga_pulchra.htm>
<www.racerocks.com/racerock/ eco/taxalab/2005/rostangap/rostangap.htm>
<www.metridium.com/monterey/nudibranchs/rostanga

<em><strong>Other<a href=”https://www.racerocks.ca/category/species/class-mollusca/”> Members of thePhylum Mollusca</a> at Race Rocks.</strong></em>

<table>

<tbody>

<tr>

<td><a href=”https://www.racerocks.ca/race-rocks-animals-plants/taxonomy-image-gallery/”><img class=” wp-image-17530 alignleft” src=”https://www.racerocks.ca/wp-content/uploads/2014/11/taxonomyicon-300×91.jpg” alt=”taxonomyicon” width=”201″ height=”68″></a><a href=”https://www.racerocks.ca/race-rocks-animals-plants/taxonomy-image-gallery/”><strong>Return to the Race Rocks Taxonomy

and Image File</strong></a></td>

</tr>

<tr>

<td><a href=”http://pearsoncollege.ca/” target=”_blank”><img class=”alignleft wp-image-5251″ src=”https://www.racerocks.ca/wp-content/uploads/2013/05/pearsonlogo2_f2.jpg” alt=”pearsonlogo2_f2″ width=”121″ height=”73″></a><strong>The Race Rocks taxonomy is a collaborative venture originally started with the Biology and Environmental Systems students of <a href=”http://pearsoncollege.ca/” target=”_blank”>Lester Pearson College UWC</a>. </strong><strong>It now also has contributions added by Faculty, Staff, Volunteers and<a href=”https://www.racerocks.ca/category/ecoguardians-log/visitor-observations/”> Observers </a>on the<a href=”https://www.racerocks.ca/video-cameras/” target=”_blank”> remote control</a> <a href=”https://www.racerocks.ca/video-cameras/”>webcams. </a></strong>

<strong><a href=”https://www.racerocks.ca/video-cameras/”>This file was originally started by

Rachel de Silva PC yr32

, Dec. 2005.</a></strong></td>

</tr>

</tbody>

</table>

&nbsp;

Dendronotus subramosus : Race Rocks Taxonomy

Posted on by

An 8mm long nudibranch

Thanks to Karin Fletcher on iNaturalist for identifying this for us.  She indicated that D. subramosus lack lateral papillae on their rhinophore sheaths and can have brown lines along from their rhinophores along their dorsolateral processes

https://www.inaturalist.org/observations/68751217

Domain Eukarya
Kingdom Animalia
Phylum
Order 		 Mollusca
Nudibranchia
Class Gastropoda
Clade Dendronotida?
Suborder Dendronotacea?
Family Dendronotidae?
Genus Dendronotus
Species subramosus
Common Name:Stubby-fronted Dendronotus
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.

 October 2004-  (PC) Garry Fletcher

Unidentified “Clear” Shrimp? The Race Rocks Taxonomy

Posted on by

 

 

Domain Eukarya
Kingdom Animalia
Phylum Arthropoda
Class Malacostraca
Order Decapoda
Family
Genus
Species
Common Name: Clear Shrimp
Unidentified
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.