Here's what the snail looks like with the bright red body mantle retracted.
who suggested that these look like Cypraea saulae and Cypraea gracilis!
Miliaris cowrie (Cypraea miliaris) and fewer Onyx cowries (Cypraea onyx) than in the past.
Pulau Sekudu has many interesting nudibranchs. But some are hard to spot. Can you spot the Sponge nudibranch (Ategema spongiosa) in this photo? It's quite large and looks just like a boring sponge or dead coral rubble in texture and shape, complete with holes and bumps all over the body.
Jorunna funebris, Dendrodoris fumata, Thordisa villosa and Ategema intecta.
Fine-lined flatworms that seem to only be common in Chek Jawa and Pulau Sekudu. They were huge!
Knobbly sea stars (Protoreaster nodusus). But no young ones.
Biscuit star (Goniodiscaster scaber) and one Eight-armed sand star (Luidia maculata), as well as as many Plain sand stars (Astropecten sp.). But I didn't see any other kinds of sea stars.
Long spined black sea urchins (Diadema sp.) were still there! I saw one large pink Thorny sea urchin (Prionocidaris sp.) and a few Black sea urchins (Temnopleurus sp.). There were lots and lots of White sea urchins (Salmacis sp.). And I saw two Blue feather stars. Kok Sheng and Ivan saw special sand dollars: the Pink sand dollar (Peronella lesueuri) and but I only found the common Cake sand dollar (Arachnoides placenta).
Candelabra sea fans and Gnarled sea fans.I looked and didn't find any ovulid snails or other commensals like brittle stars and clams. I also saw one short sea whip. I didn't see any Skinny sea fans.
Pink flowery soft corals (Dendronephthya sp.). But couldn't find any of the snails that often live and feed on them.
ball flowery soft corals (Family Nephtheidae) and they had commensals. Tiny porcelain crabs and white snapping shrimps. But I didn't come across any False coweries in them.
sponges growing on the coral rubble, but not a wide variety and they didn't encrust the rubble densely.
Pore corals (Porites sp.). But I didn't come across the other kinds of hard corals that I saw during our trip last year.
Mud crab (Scylla sp.) has just moulted! See how much larger the crab is compared to its 'old skin'! Mud crabs are those that we eat in Singapore's famous chilli crabs.
octopus I saw on the trip, a tiny little one.
Haddon's carpet anemones (Stichodactyla haddoni) on Pulau Sekudu! There were also many Swimming anemones (Boloceroides mcmurrichi), the rubbly area was carpeted with Posy anemones. There were also some flowery sea pens (Family Veretillidae), lots of Common sea pens (Pteroides sp.) and some Common peacock anemones (Order Ceriantharia). Also abundant on the shore were Broad zoanthids (Palythoa mutuki) that looked much larger than the usual kind that I see elsewhere.
Tape seagrass (Enhalus acoroides). But the most abundant species are Spoon seagrasses (Halophila ovalis) . There are also lots of healthy looking Fern seagrass (Halophila spinulosa). I didn't manage to see the Serrated ribbon seagrass (Cymodocea serrulata) that I saw on in 2011. There were many Fan shell clams (Family Pinnidae) in the seagrass areas, with many dead ones in the now very sandy lagoon.
GIS map done and shared by Dr Raju, Kok Sheng and I checked out the 'arm' on the eastern side. I noticed what seems to be a boat strike in one part of the island, while the entire lagoon and the outer 'arm' seems a lot sandier than on our previous trips. With large areas of bare sand and signs of immobile animals being buried. Where is the sand coming from?
Another disturbing sight, the Mangrove cannon-ball tree (Xylocarpus grantum) that grows in the middle of the island was almost completely leafless.
Perepat (Sonneratia alba) were also in the process of being denuded by the caterpillars.
the 2007 mass deaths, the marine life from Pulau Sekudu will help to 're-seed' Chek Jawa. Pulau Sekudu is indeed an important part of the ecosystems not only at Chek Jawa, but also other northern shores like Changi.
Pulau Sekudu (and Chek Jawa) may be affected by the 2030 landuse plan by the Ministry of National Development. The plan includes plans for a road link (black line) from the mainland jumping off at Punggol, crossing to Pulau Ubin through Chek Jawa to jump off to Pulau Tekong before circling back to the mainland on Changi East. Proposed reclamation (in yellow) will bury Pasir Ris shores, Pulau Sekudu and Chek Jawa as well as a large amount of shore at Changi Beach.
|Click on images for larger view.|
Pulau Sekudu is off limits since 2007 and requires special permission from NParks. Thanks to NParks for permission and support to do these predawn low spring tide surveys of Pulau Sekudu. Our last survey was in May 2012. Thanks to Alan at NParks for permission to visit and to Chay Hoon for organising the trip! And for the rest of the volunteers for helping to thoroughly survey this small but very rich island.
Posts by others on this trip