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Armina Californica An Independent Dive Club Newsletter Date April 2003 Inside this issue: This Months Meeting This Months, Last 1 Months Meeting. 6 PM Dinner and Social Hour 7:50 PM Blackbeard’s Locker Announcements. 1 7 PM Guest Speaker This months Blackbeards will be a Dacor Classic regulator . For our April meeting, our guest 8 PM General Meeting The Sands of speaker will be Bottom Bunch 2-7 La Jolla. members Jeff Hannigan and Faith Meeting followed by door prizes. Ortins. They will be sharing with Club Officers, 8 us some of their dive stories and Buddy List. photographs from their trip to the Red Sea. Join us for an entertaining Door prizes generously donated evening with some of Faiths won- By Aqua Tech Dive Center derful stories and Jeff’s incredible 619-237-1800 photography. And the Hydrodiver 1-800-493-7634 Dates To Remember Last Months Meeting and Announcements Last Months Meeting the diver when conducting on the salinity levels. Thank you Bottom Bunch night dive and For our March meeting our guest strenuous activity and facilitate Sergio for an informative evening. picnic at La Jolla Shores. speaker was Sergio Angelini easier breathing of the thicker air April 25th, 7 PM. PhD, the chief design engineer at of deeper depths, particularly Announcements Scubapro. He gave us an informa- those depths beyond the current For those going on the Bottom Northern Channel Islands. tive and technical talk on the test- recreational dive limits. Thus Bunches annual trip to Catalina May 24, 25, 26th, 2003. ing and performance characteris- reducing the possibility of over and San Clemente Islands, June tics of regulators. Sergio’s pri- breathing the regulator, which 7th, 8th, 2003, your payment is Catalina and San Clemente mary discussion centered on the could lead to carbon dioxide due in full by the April meeting. Islands. current industries standards and buildup in the blood stream, re- Available spots will be open for June 7th and 8th, 2003. beliefs on the maximum allow- sulting in fatigue, panic, uncon- sale to the public after the April able pressure of the air flow com- sciousness and beyond. meeting. Santa Barbara, San Nicholas ing from the primary regulator and San Clemente Islands. through the secondary regulator Other interesting data Sergio re- September 26,27,28 2003 and into the lungs, (that feeling ported was the internal operating Contact our Dive Coordinator, of being fed air from the regula- temperature of the primary regu- Wayne Austin, for further infor- tor during inhalation.) Current air lator. During usage, the primary mation. 619-524-5323. flow maximums are set at a level regulators temperature is ap- Reminder that is believed necessary to pre- proximately fifty degrees below Bottom Bunch night dive and Please check your mailing vent lung over expansion. How- the surrounding waters tempera- BBQ at La Jolla Shores, April label for your Bottom Bunch ever, the data Sergio has been ture. 70 degrees F becomes 20 25th, 7 PM. Bring a dish and join membership renewal date. collecting, indicates that this degrees F, 50 degrees F becomes your fellow club members for a pressure level maybe allowable at 0 degrees F, 30 degrees F be- wonderful evening around the fire The Bottom Bunch Website twice the current maximum lev- comes –20 degrees F. The freez- on the beach at beautiful La Jolla www.bottombunchdiveclub. els. This would allow a higher ing point of salt water is approxi- Shores. The Club will provide the com volume of air to be supplied to mately 28 degrees F depending soft drinks, hotdogs and buns. By Dr. Hans Bertsch College of Oceaneering THE SANDS OF LA JOLLA Kearny Mesa, CA 92123 n last month’s newsletter, I discussed various You’ve been there and tried to wriggle into your I principles swimming suit inside the car of taxonomy, so no one can see your white what alcyonari- fenders exposed to the Gawk- ans are ing and then complaining (gorgonians Prudery Republic of the and their rela- Beach Control. Well, I tives), and the probably shouldn’t exaggerate arminid nudi- too much, because I have seen branch Histio- both the inconsiderate and the mena convol- considerate. Bottom Bunch vula, which oc- members know the difference, curs in the and I am proud of that. northern Sea of Cortés and eats So, the Sands of La Jolla— gorgonians. this is where many people This month have taken their check out let’s use all that dives, only to vow, information and “Nevermore, quoth the Certi- illustrate the Figure 1. The snail Hypermastus on the sand dollar Dendraster. fied.” But here is where one life habits of a can use all the kinds of skills I southern Californian nudi- talked about last branch Armina californica. month to discover We will also make a lei- and record new surely perambulation with and exciting infor- fins among the other crea- mation. I have ture features at La Jolla published 2 scien- Shores! tific articles about snail and slug life It was a typical day at the that I found here. Shores. Parking was ob- noxious, the local residents One of my articles were surly, divers had gear (1994) reported spread on the sidewalks, the on the natural his- showers were non- tory and ecology functioning, and the change of an unnamed room was closed at “prime species of eulimid time” (8:30-9:30 am) for snail. This snail is cleaning and maintenance tentatively named by a rubber-booted team Hypermastus sp. from SD park maintenance. The genus is Suddenly, the term La Jolla Figure 2. The sea star Astropecten. known, but the took on a new perspective. Page 2 Photography by Hans Bertsch April 2003 species is still to be determined and scientifically the mouth side) surface of the common spiny sand sea named. Its shell is small (4-8 mm in total length), tur- star Astropecten armatus (see Figure 2 which illus- ret-like, and glossy white. The animal is an ectopara- trates this beast). site on our local sand dollar Dendraster excentricus (see My other sci- Figure 1) entific article about animals Living Dendraster are set up from La Jolla like vertical poker chips in Shores was subtidal regions. They are co-authored usually present in large with Tom “beds,” their flattened bodies Smith (Figure oriented with the primary 3 shows him currents (opposite the posi- behind a gor- tion of gorgonians that face gonian at Ba- across the currents). Both hía de los feed on nutrients that the Ángeles). currents supply. Groups of We reported Dendraster. Beds. Perhaps new distribu- we need a new word here. Figure 3. Diving buddy Tom Smith, behind a gorgonian. tional rec- Lots of species of animal ords for groups are so distinguished, like a “covey of quail.” three species of nudibranchs, including Flabellina pri- So maybe a large bed of Dendraster should be called cei. an “economy of sand dol- More recently, in 1998, lars”! Ángel Valdés and David Behrens described the The Hyper- nudibranch species Dori- mastus snail I opsilla spaldingi (with un- have discussed derwater color photo- lives attached graphs provided by Mi- to the exposed chael Miller). This species portion of is known from La Jolla Dendraster ex- Submarine Canyon, San centricus, and Miguel Island (of the sticking its Santa Barbara Channel Is- proboscis into lands) and south the fleshy parts Coronado Island, Mexico. of its host, sucks out Of special significance lunch. I have while describing the opis- counted any- thobranch fauna of La where from 1 Figure 4. A portrait of the sea pansy, Renilla koellikeri. Jolla Shores is the under- to 7 Hypermas- water photography of tus sp. snails on Steve Gardner, who as a a single Dendraster excentricus. I have also seen this mild-mannered member of the Bottom Bunch turns echinoderm-sucking snail on the aboral (that is, not on himself on weekend mornings into UW Bumblebee— The Bottom Bunch Page 3 and returns from La Jolla Shores with exquisite pho- Flabellina pricei, Doriopsilla spaldingi, and the ani- tographs of nudibranchs and other invertebrates. You mal I am now going to discuss: Armina californica. may appreciate Steve’s work on a link through The Slug Site Sand. Sand. Sand. Flat ex- (under the panses of sand that eventu- site- ally drop off into mudstone mastership cliff faces and canyons. I am of Mike gently swimming above the Miller). Call economies of sand dollars so up the URL that I do not disturb their of www. feeding positions by the hy- slugsite. draulic force of my fins, nor tierranet. touch them with my hands com or or other body parts. Once www. past them, I return to my slugsite.us . reptant behavior, crawling Once there, over the sandy benthos. click gently Slowly. Over the sand. on the Flag Dozens of animals become on the left Fig. 5. The sands of time: the nudibranch-eating slug Navanax inermis apparent to me, but I am fo- hand side to and the alcyonarian-eating nudibranch Armina californica. cused on the alcyonarians begin scroll- (remember our taxonomy ing down the list of multiple links. When you reach lesson in last month’s Bottom Bunch Newsletter?). DIVE LA JOLLA SHORES WITH STEVE There, I see it, below me, is the circular purplish form GARDNER you can access his photographs. Within of a Renilla koellikeri sea pansy (Figure 4). I don’t his site is another link to an touch it. hourly updated image of La I look. A Jolla Shores—honest, a real gentle photograph of what the surf layer of looks like there! What a fan- sand tastic gift to us.
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