Corolla spectabilis: Pteropod–The Race Rocks Taxonomy

 

Pteropods are occasionally found in the plankton that passes by Race Rocks and are found distributed throughout the Atlantic and Pacific Oceans..They have a transparent body with no external shell. An internal gelatinous pseudoconch provides protection and skeletal support. A continuous plate is formed by the oval wings which are marked by indentations.A long proboscis partially fused with the wing plate.The pteropod has a wingspan of up to 8cm. It lacks radula and jaws and it has a distinctive dark gut nucleus.Because it is planktonic, its biotic associations include predation by anything that eats jellyfish.

REFERENCE: ”Pacific Coast Pelagic Invertebrates” by David Wrobel and Claudia Mills—Note: This source had an error which was pointed out to us by Moira Galbraith of DFO:—-“I think that your video in the Race Rocks portion of the website is actually of Corolla spectabilis. The 12 mucous glands on the anterior lateral borders of the wing plate are a species characteristic; C.calceola will have 18. Also according to Carol Lalli, only Corolla spectabilis occurs in the eastern Pacific.
See http://faculty.washington.edu/cemills/ActaErrata.html for an update.

Domain: Eukarya
Kingdom: Animalia
Phylum: Mollusca
Subclass: Opisthobranchia
Order: Thecosomata
(Suborder)(Pseudothecosomata)
Family: Cymbuliidae
Genus: Corolla
Species: spectabilis
Common Name: Pteropod
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.

 

Visitors and volunteers!

Weather

  • Visibility: 15 Miles
  • Wind: 5-10 knts W
  • Sky: Partly cloudy
  • Water: Ripply

Boats/Visitors/Sightings

  • Quite a few ecotour boats today
  • One of the whale watching boats entered the channel on the East side of the main island. I was busy trying to get them to reverse out and couldn’t run to get a picture unfortunately. I’ll be on the lookout for the same boat again.
  • Guy brought several volunteers and visitors to the island today! The volunteers helped Guy place some of the old batteries on the upper shelves of the battery room. Guy was also able to help me with the desalination and power washer issues. We were also able to test the YSI meter to confirm that it is giving inaccurate readings and needs to be fixed.

Marine Mammals

  • There were 3 female and 1 male Elephant Seals on the island today. The second male from yesterday was nowhere in sight.

Very windy day

Weather

  • Visibility: 15 Miles
  • Wind: 20-30 knts W
  • Sky: Partly cloudy
  • Water: White caps, 1-2 meters
  • Some light showers during the afternoon

Boats/Visitors

  • Just a couple of ecotour boats today due to the strong wind.
  • Not much private boat traffic either

Birds

  • The seagulls have gotten noticeably more aggressive but still no signs of offspring

Marine Animals

  • There were four Elephant seals on the main island today – one male and three female. The male and one female seemed to occasionally get aggressive with each other, but no harm was done to either.
  • One of the females still seems to be undergoing the molting process.
  • Elephant Seal tagged B198 is still on the island and has been in the same spot over the last few days.

Overall, quite an uneventful day.

Census Day!

Weather

  • Visibility: 15 Miles
  • Wind: 15-30 NW
  • Sky: Mostly clear
  • Water: Waves 1-2 metres

Boats/Visitors

  • one or two scattered ecotour boats
  • Guy brought 3 tour groups, only one of which docked. The tides and currents were uncooperative for the other two groups. The group that came ashore spent about 30 mins visiting the student residence and lighthouse.

Census

  • stellar sea lions – 16
  • california sea lions – 8
  • elephant seals – 3 female, 1 male
  • gulls – 200
  • pigeon guillemots – 105
  • oyster catchers – 12
  • geese – 4
  • eagles – 4

 

Christmas Bird Count at Race Rocks- Dec 28, 2017

This year is our 20th year in assisting the local birders with the Rocky Point Bird Observatory in doing a count at Race Rocks. Given the time of year this has to occur, it is often thwarted by bad weather, but in the past counts, some very interesting species and population numbers have shown up.  See this index of past years Bird Counts. https://www.racerocks.ca/race-rocks-animals-plants/bird-observations-at-race-rocks-3/christmas-bird-counts-starting-in-1997/

Kim Beardmore same along to record the birds for the 2017 Christmas bird count. Here Kim on the left and the Ecoguardian Mikey Muscat check on one of the 5 male elephant seals.

Although we went to count birds, I found that the most impressive thing was that there were 5 large male elephant seals on the island and two juvenile females. When compared with other years this was quite unusual, and it could be interesting when the females come back in January to have pups. I predict there will be a lot of male aggression going on in mid-January.

These four species other than several gull species and bald eagles were part of the count  which we will add below .

Other observations around the island:

Romanzoffia tracyi

I took advantage of the few hours there to check on other aspects of the island from the ecological reserve warden point of view.  Especially noticeable this year were the massive fields of mud over most parts of the island where the california sea lions hauled out over the past few months. I was concerned about the erosion and rock disturbance that this has caused.   Most of the plants in many parts of the island have been obliterated. I did however find this one healthy patch of Romanzoffia tracyi behind the boathouse. Protected because of its location among  the rocks. I checked some of the other known locations of this rare plant but didn’t see any.

Black oystercatcher midden

 

One feature that was very evident with the lack of vegetation was the extensive beds of chiton shells which are evidence of black oystercatcher middens from last season.

 

 

 

Two immature or juvenile female elephant seals were on the island, one tagged ..green C887

The five males:

I have been watching the vegetation cover made up of the introduced species of Sedum or stonecrop which was on the top of the reservoir.. In my September photo the bed was quite dried and cracked. Now it  has partially recovered.. This is one place the sealions seem to avoid.

 

Because Pearson College could not provide boat transportation this year, and because I was determined to continue the 20 year tradition of this valuable baseline collection of bird population data, we rented a boat from Pedder Bay marina for the trip to Race Rocks.  A list of the birds observed by Kim Beardmore is  attached here.

 

Race Rocks,
Dec 28, 2017 9:05 AM – 11:37 AM
Protocol: Traveling
7.5 kilometer(s)
Comments:     CBC, Race Rocks
16 species (+1 other taxa)Harlequin Duck  10  (North and west Race Rocks)
Surf Scoter  55  (outer pedder bay)
Red-breasted Merganser  18 (mostly outer Pedder bay)
Common Loon  2
Horned Grebe  1
Brandt’s Cormorant  14
Pelagic Cormorant  18
Double-crested Cormorant  10
Bald Eagle  4
Black Oystercatcher  42
Black Turnstone  59
Common Murre  1  ( in outer Pedder bay)
Pigeon Guillemot  10
Mew Gull  14
Iceland Gull (Thayer’s)  8
Glaucous-winged Gull  69
Western x Glaucous-winged Gull (hybrid)  2

First Week as Ecoguardian

Weather

  • Visibility: Very foggy early morning but cleared right up by 8:30am
  • Wind: 11-16 NE throughout the day
  • Sky: sunny with cloudy periods
  • Water: mostly calm, a bit choppy

Boats/Visitors

  • Had about 7 boats cruise by in the last week
  • had a small tour come ashore last saturday morning of pearson college students

Ecological

  • had a young harbour seal that was on the island for a few days but is gone now
  • there are a pair of eagles hanging around for the last week
  • large male elephant seal was here for 6 days and left last night
  • caught a quick glimpse of what looked like a small sea otter running by the jetty yesterday morning

Other

  • had a very large blast go off from Rocky Point that shook the house and startled birds.

Notes

  • enjoyed my first week here at Race Rocks!

Warden’s report Race Rocks September 2017

I was able to get out to Race Rocks Ecological reserve with Guy today and went with former student Joao Luis de Castro and Yan Corriveau. I  wanted to check on what changes have occurred on Great Race Rock Island  since my last visit. Since it was an exceptionally dry summer, the effect on vegetation was evident. The spread of hauled out sealions into parts of the island traditionally not invaded also has left a significant impact on vegetation. It will be important to  follow up on vegetation recovery once the rains start.

This year the sea lions have hauled out and inhabited many parts of the island formerly not used as a haulout . I am concerned that erosion because of obliteration of most of the plants in the area of the First Nations burial cairns could be detrimental to the cairns. It will be inprtant to check on this once the sealions have left again.

The lack of precipitation since May has resulted in a shrinking of the stonecrop that covers the top of the Reservoir. I had never seen it quite this dry before.

 

The sealion haulouts at Race Rocks do not segregate by species as they do in some other parts of the coast. Note the cookie-cutter shark bites on the California Sealion on the right hand picture.

 

Garry Fletcher, Sept 25, 2017

Long term record for harbour seal at Race Rocks

Pam Birley sent this picture today that she took with the remote camera of Six-spot, a harbour seal she has photographed over a several year period. see previous post at https://www.racerocks.ca/6-spot-the-harbour-seal-observed-at-rr-since-2008/