One of the nice things about Cornwall is that there are so many coves and beaches, that even after seven years of living here, there are still plenty left to discover. This weekend we visited Kennack Sands on the Lizard peninsula. Two fine sandy beaches separated by a small hill and a rocky outcrop in the sea. What I also like about Cornwall is that every rock has a name. The rocks we explored are called Caerverracks. The tide was pretty good, the weather as well (except for a brief shower). The viz however was quite bad, and so I hope to go back one time when the sea is flat to retake some of these pictures. The rocks did offer some shelter though and it was great to be in the water. I focused (no pun intended) on a type of kelp called Furbellows (Saccorhiza polyschides). It is called that way because of the ruffles on the stipe (in dress-making, furbelow is another word for ruffle). These wavey frills help to dissipate wave energy, which of course can be very intense on Atlantic shores. This seaweed is much more prone to epiphytic groth than the surrounding Laminaria kelp. This must be the reason why it is always covered with grazing Grey topshells Steromphala cineraria. As with other kelps, it is home to the Blue-rayed limpet Patella pelucida. As the conditions were bad, I was forced to limit myself to a large, abundant and non-moving subject, but it was actually quite nice to work within such constraints. One of my favourite seaweeds and when conditions are better (and when I am by myself, with more time and a weight belt so I can dive down instead of holding the camera down and shooting ‘blind’), I definitely want to try again!
Last week when I was chasing whitebait off Castle Beach, I also took some photos of seaweeds. I have been taking photos of seaweeds at this same same spot every month this year (I have made a new tag 2017 Falmouth seaweeds, if you click that, you can easily track the changes back in time). Many species are dying off, so it is definitely not looking as pretty as in March or in April. Below some evidence of the decay: first Furbellows Saccorhiza polyschides covered in grazing Grey topshells Gibbula cineraria and second, discoloured Berry wart cress Sphaerococcus coronopifolius and Red rags Dilsea carnosa. Below some species that still look healthy: Bushy rainbow wrack Cystoseira tamariscifolia, Hairy sand weed Cladostephus spongiosus, Chipolataweed Scytosiphon lomentaria (not 100% sure!), Polysiphonia and Codium.
It was too cold and windy to spend a lot of time on the beach, so I took a closer look at my seaweed catch back home. I was amazed at the diversity of organisms growing amidst the weeds. A lot of them are easily overlooked when rock pooling as you need some time (and preferably a comfortable seat) to find them. Below Bushy rainbow wrack with epiphytic False eyelash weed and Pink plates Mesophyllum lichenoides (I will not give the Latin names of species described in preceding posts for brevity). Some bright green sea lettuce Ulva, a grey topshell Gibbula cineraria, a snakelocks anemone Anemonia viridis and in the middle a bright orange colony of the tunicate Botrylloides leachi: I found many large Breadcrumb sponges Halichondria panicea but the picture I took did not turn out to be in focus. I do not know what the organism below is, perhaps a bryozoan (please feel free to comment!). I am not sure what this is either! Dog whelk Nucella lapillus eggs (I now also notice a tiny brittle star in the middle): Egg cases of the thick-lipped dog whelk Hinia incrassata: A small snakelocks anemone; interestingly enough all of these were the green variant (with purple tips) and there were none of the pinkish ones. I have read some interesting notes about aggressive behaviors between the two types, something to look into for a future post. A Marbled Crenella Modiolarca tumida, a tiny bivalve typical of seaweed holdfasts: A tiny White tortoiseshell limpet Tectura virginea: I saw something creeping out of the seaweeds on the floor out of the corner of my eye: a small Long-legged spider crab Macropodia rostrata. This species adorns itself with seaweeds for camouflage: