Blogging slowed down a bit recently due to (variously or simultaniously) bad weather, work, bugs or unavailability of dive buddies. I entered one of the better photos I made this year (from this post) in the BBC Wildlife Magazine competition for fun and managed to get it published in the May issue, which was nice. I think I only went out once, which was a pontoon excursion in Mylor marina, the first time with the Canon G16. I tried some shots from above lying on the pontoon; I need to actually get in the water to get a better view of all the sponges, tunicates, peacock worms, mussels, oysters, anemones and seaweeds encrusting it. This shot of the Light bulb sea squirt Clavelina lepadiformis turned out best, but I believe there is a lot of room for improvement. I have bought a light which I will bring next time. I also ordered a strobe, so hopefully some proper dive photos very soon!
A quick snorkel this Tuesday to check out my favourite rock pools at Castle Beach here in Falmouth. The tide was low, the water still and the sun was shining, creating beautiful shimmers of light. The Wireweed, Thong weed, Sea lettuce and also the Bushy rainbow wrack are in full swing, but most of the other species are in decline, with for instance the Harpoon weed and False Eyelash weed bleaching. Still, it is very pretty! The most common fish encountered so far this year have been Two-spot Gobies, with the occasional wrasse or dragonet. Now, loads of juvenile Pollack Pollachius pollachius have appeared (ID thanks to the excellent folk at the Seasearch Cornwall facebook page). The following photos are all variations on the same theme; I could not decide which ones were best so I just posted the whole lot: In the photo above you can make out some Snakelocks anemones on the right; compare with the last two photos of this post from six weeks ago to see how the same scene has changed. The stalked jellyfish seem to have largely disappeared along with the decline of seaweeds. However, you can still spot the odd interesting animal. The photo below is of the small gastropod Mangelia costata. Probably not very rare, but small (<15 mm) and well-hidden and so not that often seen:
Just a photo to show the beauty of Cornwall in spring! The snorkeling at the beach in Porthcurno (next to the marvellous Minack Theatre) was very pleasant this weekend, although there was not a lot to see: mainly white sand and wave-battered rocks covered in barnacles. I have simplified the “An Bollenessor” domain name and updated the Links page btw.
Above an illustration of the decline of seaweeds: Juicy whorl weed Chylocladia verticillata all white and fuzzy (see for a more healthy looking plant this post from 2.5 months ago) on a bed of the common and pretty Discoid fork weed Polyides rotundus. There seem to be around 25 or so (larger) species that are common in these pools. Many of them can be seen in the two photos below (including a stray Bladder wrack, a species that dominates the shore just a meter higher): Below, a whole bunch of individual species. First, Sea beech Delesseria sanguinea, which must have washed up from under the kelp beds (too bad I did not get the entire plant in frame…). Second, a photo of Ulva with Chipolata weed Scytosiphon lomentaria. Third, the brown Divided net weed Dictyota dichotoma. Fourth, Slender wart weed Gracilaria gracilis. Fifth, False eyelash weed Calliblepharis jubata; this plant has grown quite large and has turned from dark red/brown to a much lighter brown. Sixth, the Falkenbergia stage of Harpoon weed Asparagopsis armata (see the third photo) on the right. Seventh, Red grape weed Gastroclonium ovatum. Finally, two photos of my favourite species the blue Bushy rainbow wrack Cystoseira tamariscifolia.
Less than 12 hours back in Cornwall and I managed to slide into the rock pools at Castle Beach in Falmouth this Saturday to see what the seaweeds looked like. There was a noticeable difference with only a week ago. The speed at which seaweeds grow, and decline, still amazes me. I managed to take my best photo yet, of Red rags Dilsea carnosa (surrounded by a whole bunch of other species), above. I made so many photos that I will split them over two posts, with some general ‘seaweeds scapes’ here and with individual species in the next post. The Sea lettuce Ulva has been taking over parts of the pools, turning it a bright green. The reds of the Juicy whorl weed and Berry wart cress and pink of Harpoon weed are less bright, and the Red grape weed and Fern weeds are turning ‘fuzzy’. Still, the seaweeds are much bigger and cover most of the seabed and it looks very exuberant. The Wire weed and the Thong weed (or ‘spaghetti weed’) Himanthalia elongata have been rapidly growing; the latter consisted of ‘buttons’ in January and are now a meter long, so must grow around a centimetre a day. The fronds are covered in flakes (which must be reproductive structures) that come off when you swim through them, clouding the water and so ruining the shot if you do not take it straight away. The sun came out more in the last photos, hence the different light (I have edited most (not all) photos slightly using standard Windows Photos, mainly by decreasing the highlights). More photos very soon!
A whole bunch of photos from last Friday, starting out with the prettiest ones depicting a whole range of species, most strikingly the crimson Gracilaria and blue Cystoseira. I was so pleased with it I shared it on the Seaweeds of the NE Atlantic facebook page and Frances Bunker, one of the writers of the highly recommended Seasearch Guide to Seaweeds of Britain and Ireland, kindly uploaded a photo with all scientific names. This is a great idea and I should do the same for future posts (I have not done so yet as I am back home and did not bring the guide). As good as it is to be back in the Low Countries, I am missing out on being able to snorkel in some very good weather and likely better visibility than for the photos in this post. The rock pools have changed markedly since the last post a couple of weeks back, with hardly any patches left without seaweed growth. The colours have changed too, with much more of the green Ulva, and more brown (e.g. Calliblepharis) relative to reds. Some seaweeds seem to be in decline already (e.g. Gastroclonium) while some are more prominent (e.g. Palmaria). Below I have posted a range of photos, some are pretty good, others not so much, but they give a good impression of the diversity (most photos have at least ten species in them but I have not gone through the trouble of typing all the names): I have no clue what the brown, thin, frilly species is above. Below some individual species, first Dulse Palmaria palmata and Sea flax weed Stypocaulon scoparium. Not 100% sure about the next three: Dumontia, Lomentaria and either Laethisia or Colpomenia (I should know this…). Finally, some photos taken under the cover of Thongweed Himanthalia. More photos next week I hope!
David Fenwick (Aphotomarine), Matt Slater (Shoresearch Cornwall) and Thomas Daguerre (HydroMotion Media) had all tipped me off about the elusive ‘Cave of Dreams’ at Pentire/Fistral Beach in Newquay. Recent posts by Cornish Rock Pools and The Marine Enthusiast reminded me of the stunning Scarlet and gold star coral Balanophyllia regia that live there and made me decide to drive all the way (well, it is a good 45 minutes) to the North Coast. I did not find the cave on two earlier visits (see this post from almost exactly one year ago), but today Thomas showed me exactly where it was. Cave is a big word, it is more of an overhang, and I don’t think I would have ever managed to discover it myself (you can find a photo of it behind the aphotomarine link). The corals are tiny, 5-10 mm in diameter, but there are many of them, in the low hundreds. Unlike most corals, this species relies solely on catching food with its tentacles, and it does not have algal symbionts (zooxanthellae) to provide energy from photosynthesis. Dark ‘caves’ with lots of waterflow are thus a good habitat for them. They look a bit like the tropical sun corals, who I was lucky to see in Hong Kong last year, and which are quite popular in the reef aquarium hobby. I had to carefully position myself on the rocks, dipping my camera in the water. It was too shallow to stick my head in, and I did not want to enter the water anyway, to prevent disturbing this widespread, but uncommon species. There were some interesting sponges and red seaweeds, but I decided to only focus (no pun intended) on the corals. I was quite excited, this is definitely one of the most interesting species I have seen so far in Cornwall and I am sure that many people would be amazed to learn that corals live on our shores. I played around with my wide-angle lens, my new macro lens and took shots without the wet lenses. The light was low and I had to contort myself a bit but some of the shots turned out nice. The macro is still difficult, but maybe I might be expecting too much from the setup I have (without strobes). I hope to go back soon and try to get more photos, I would love to try an underwater panorama shot!
I recently posted my first photos taken with the nauticam CMC macro wetlens using stalked jellyfish as a subject. I since lost my lens, which I in large part blame on the bad fit of the adapter with which it is attached to the housing. The best thing in these cases is not to agonize over it too much, order a new one straight away and keep going, so that is what I did (also I am now a bit more careful of course). Here some more photos of macro subjects. Above a very easy subject as it is very common this time of year and also it does not move….Paddle worm egg capsules (probably Eulalia viridis). The individual eggs can be just made out in the gelatinous blob. Below, one of the more common nudibranch species Polycera quadrilineata. Nudibranchs come in all kinds of stunning colour variations and are very species rich and so are a favourite of macro photographers (see this old post hunting for them with David Fenwick in Newlyn, and check out the NE Atlantic Nudibranch facebook page for lots of eye candy). Tricky with the narrow depth of field to get the whole animal in focus. Mysid shrimp are quite common and beautiful little animals hovering about in small groups. They need dissection to determine which species it is, but this might be Leptomysis lingvura (around 10 mm). Finally, the colonial star Ascidian Botryllus schlosseri; these form colonies (‘systems’) where zooids have individual inhalant openings and a shared exhalant opening. They are common, sessile, flat, and come in a range of colours so they make ideal subjects for a beginning macro photographer. Not only that, apart from fish they are our closest relatives in rock pools, which is most obvious in the tadpole-like larvae which have a dorsal notochord (a cartilage rod functioning as a backbone). I hope to devote a post to them later in the year.
More seaweed photos, taken a couple of days after the ones in the previous post, when it was overcast and the water was less clear. The photos are not as good, but there are still a lot of interesting species to see. Below some photos showing the diversity of species next and on top of each other. In the last two months, most species have been growing quite a lot. There are quite large patches of Slender-beaded coral weed Jania rubens. Bushy rainbow wrack Cystoseira tamariscifolia plants are completely overgrown with all kinds of epiphytes, seaweeds, sponges and colonial tunicates, and often have a Nursehound egg case attached. Next, photos of individual species. First some flat reds: Leafy rose weed Rhodophyllis divaricata, Beautiful fan weed Callophyllis laciniata, Branched hidden ribs Cryptopleura ramosa (probably), the invasive species Devil’s tongue weed Grateloupia turuturu and Under tongue weed Hypoglossum hypoglossoides. After that, two species that look a bit similar: left the reddish Discoid fork weed Polyides rotundus and right Clawed fork weed Furcellaria lumbricalis. The former is one of the most common species (also on the photo above it) but difficult to photograph as it usually sits on the white sand. After that, Juicy whorl weed Chylocladia verticillata. Last, two quite unassuming species: Black scour weed Ahnfeltia plicata and Sea flax weed Stypocaulon scoparium. Identifications made possible using the must-have Seasearch Guide to Seaweeds of Britain and Ireland, David Fenwick’s excellent aphotomarine website (and personal communication) and the good people of the Seaweeds of the NE Atlantic facebook group (any mistakes are my own).
Time for some more seaweed photos. These were all taken during a snorkel when the sun was shining and the water was very clear, and as a result they are some of the best I’ve yet managed to take. Often it is overcast this time of year which means that the colours are not vivid and the water can be turbid too, so I was very lucky. Above a ‘bouquet’ consisting of many species, including Chondrus, Dictyota, Corallina, Ulva, Cystoseira, Mesophyllum, Asparagopsis, Calliblepharis, Himanthalia and (probably) Rhodophyllis. I might look slightly ridiculous snorkelling in 50 centimeters of water but as long as I can look at this I don’t care! I really like the clarity of the next photo of Plocamium surrounded by Asparagopsis and Sargassum. The photo after shows the red Berry wart cress Sphaerococcus coronopifolius with some bright green Ulva, kelp and the brown red species False eyelash weed Calliblepharis jubata. More Berry wart cress in the photo after.In the first seaweed post of the year, I posted a photo of a tangle of species, mainly Hairy sand weed Cladostephus spongiosus, with Osmundea, Asparagopsis, Bonnemaisonia and Leathesia (here, third photo). Next, a photo of exactly the same tangle, which is now completely overgrown with the dark red Bonnemaisonia (an invasive species, just as the Sargassum and Asparagopsis also in the photo). I plan to take more photos over the months to track this succession. In the photo after that Bushy berry wrack Cystoseira baccata (still quite spindly after the winter) covered with a couple of red epiphytes and the brown Dictyota dichotoma. The last photo shows a beautiful red species covered in reproductive structures, I hope someone can tell me which species it is! Update: Spotted scarf weed Nitophyllum punctatum.