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.
OK, it was the plan to post a general Falmouth seaweed/rock pool photo post every month but I am faltering the second month in… It is not for lack of trying, because I have been sneaking out of the office quite a bit, but the weather has been pretty awful. Lots of wind, choppy waves, rain, cold and bad viz. I had one good day this week and I am posting some of the better pics from that session. Again a photo of Nursehound mermaid’s purses attached to Bushy rainbow wrack, pretty much the only seaweed species these sharks use to attach their egg cases to. This must be because this seaweed species is very sturdy, and especially because it is a perennial: the eggs can take up to twelve months to hatch! Below three more Bushy rainbow wrack Cystoseira tamariscifolia photos. The first photo shows a short plant with few epiphytes but the following photo shows that this species is an especially great substrate for all kinds of other seaweeds, including Harpoon weed, Fern weeds and Juicy whorl weed. The plant in the third photo (unfortunately out of focus) is completely covered by a beautiful flat red species: Above a general impression of the scene before the sun reappeared. Btw, most of the photo’s have not been post-processed but some I have tweaked a little using the standard photo editor that comes with Windows 10, which is actually really good. The seaweeds have been growing quite a bit since January. A few have become more prominent, such as Slender wart weed Gracilaria gracilis (first two photos) and (I am not 100% sure) Purple claw weed Cystoclonium purpureum in the two photos after that. I have a bunch more photos that show different seaweed species, but I hope that I can take better pictures of these later this month for a follow-up post (I am trying to find a balance between showing what I have seen and posting ‘good’ photo’s, which is a bit tricky!). I have a macro lens now as well, which I will mainly use for animals but also can be used for the smaller seaweeds; the last photo is a first attempt.
Coralline algae, pink and purple, feathery or encrusting, are a conspicuous part of the local rock pools. When viewed close up, even the crusts are not boring, as they reveal little stalks and holes forming reproductive structures. The above species could be Common pale paint weed Lithophyllum incrustans or Common purple paint weed Phytamoliton purpureum; it is hard to tell species apart and there are likely more species than the few described on websites or in books. In the third photo, the thinner crusts are probably Phymatolithon lenormandii. Only when looking at close-up photos it becomes apparent that juvenile limpets (Patella spp) and White tortoise shell limpets Tectura virginea are very common. Coralline algae are desirable in tropical reef aquariums, as they cover the brownish live rock in pretty colors. There are even special supplements for sale to promote their growth. They need low phosphates and sufficent calcium (as well as magnesium) to grow well, just as hard corals do. Good light helps, although there are also species that thrive under low light. I have a bit of coralline algae in my tank, but only in spots with high flow, so that seems important too. It might be a nice experiment to take a small tank, with a good light source and a decent pump (with rowaphos to keep phosphates down), and add some coralline algae-covered rocks to see what happens. Doing frequent 100% water changes will replenish calcium and magnesium, and not adding animals and food will keep nutrient levels minimal. With some interesting rock formations, it could develop into something pretty.The species Titanoderma pustulatum grows on other seaweeds, such as Irish moss Chondrus crispus on the photo above. Pink plates Mesophyllum lichenoides are coralline algae that are very common on the mid- and lower shore here in Falmouth. They look a bit like a miniature version of Montipora corals. At the moment, some individuals are covered in knobbly reproductive structures housing spores. Pink plates grows epiphytically on Common coral weed Corallina officinalis, the species that makes up the bulk of the coralline algae in the rock pools (see second photo of this post, on the right). Slender-beaded coral weed Jania rubens is also quite common at the moment. Corallina and Jania can be seen growing side by side in the second-last photo. Jania here grows epiphytically on Hairy sand weed Cladostephus spongiosus (this species is normally fuzzy but in winter the branches are bare and slender). I hope to go diving soon and take more photos of the most ‘spectacular’ coralline algae: maerl.
It is my plan to post photos of seaweeds from one large rock pool in Falmouth every month. As I am making good on my new year’s resolution of going out to the beach, I have some more photos to post before it is February though. I am slowly learning to take better photos, but will also post ones that are not that great to cover more species. Below, Club bead- or Feathery tube weed Lomentaria clavellosa, the small epiphyte Little fat sausage weed Champia parvula (heavily cropped, I need a macro lens!) and Juicy whorl weed Chylocladia verticillata (with some of the edible Dulse Palmaria palmata on the left of it).I found quite a few more species but the photos ended up a bit meh, so I will have to go back and try harder. Below, two that ended up quite nice. Serrated wrack Fucus serratus covered with a variety of red epiphytes and a piece of washed up Sea oak Halidrys siliquosa.
As I noticed that the rock pools have started to look really pretty, I have gone out snorkelling four times the last week to photograph seaweeds. Bitterly cold (around 10°C) but worth it! It is my aim to post photo’s taken at the same spot every month this year, let’s see. The first three days the tide was very low, making it more of a lying on the sand rather than actual snorkelling. The sun was out and my main challenge was to get to grips with overexposure, checking histograms and decreasing image brightness. The other main challenge is to not stir the sand up and create ‘marine snow’. It makes a world of difference to actually stick your head underwater and look through the viewfinder instead of lazily only submerging the camera. For now, I have only cropped and adjusted contrast of jpegs using Picasa, but I have also shot in raw format and hope to get more out of the shots in the near future. With help from the excellent Seasearch Guide to Seaweeds of Britain and Ireland and the Seaweeds of the NE Atlantic facebook page some of the species could be identified. Above, Osmundea osmunda (probably), which has a very nice blueish (‘glaucus’) tinge (I need to take some close-ups of that next time). In the following photo, a whole tangle of species, mainly Hairy sand weed Cladostephus spongiosus, with Osmundea, Asparagopsis, Bonnemaisonia and Leathesia. Next, another picture of a whole variety of species, I would like to find out what the red epiphyte is. Below some photos of individual species of red seaweeds (mostly not great but it gives an idea of the diversity). First, Leafy rose weed Rhodophyllis divaricata, next Falkenbergia (which is actually not a species but a distinct phase in the life cycle of Harpoonweed Asparagopsis Armata), Berry wart cress Sphaerococcus coronopifolius, Irish moss Chondrus crispus, Beautiful fan weed Callophyllis laciniata, Under tongue weed Hypoglossum hypoglossoides, Chondrus with Falkenbergia and Hypoglossum and Plocamium on top and a small unknown species. You can see that most photos suffer from overexposure (and notice my crude upped contrasts). The last time I went snorkelling, it was overcast and the tide was higher. I tried a bunch of shots a greater distance away to capture more of an overall impression, but with more water between the subject and the lens the shots become ‘milky’. The next shot of a whole variety of red, green and brown species (with Clawed fork weed Furcellaria lumbricalis in the middle) could have been really nice with clearer water, better framing and correct exposure! The next shot shows Cladostephus and Thong weed Himanthalia elongata on top of a rock covered with Red grape weed Gastroclonium ovatum (also on the last photo).