Muizenberg and Kalk Bay collections

Eric leaving the sea.
Eric the Bond girl leaving the sea.

Muizenberg

Three sites were scouted on 9 April 2015 via snorkel at Muizenberg but no kelps were sampled and only Ecklonia was seen.

GPS coordinates site 1: Syy.yyyyy° Exx.xxxxx°

Swam out from Bailey’s Cottage along flat rock shelf. Ecklonia found as sparse individuals growing on the flat shelf at a depth of ~ 1-2 m. Snorkel from ~9:00 – 9:20 (Robert S, Robert W and Eric surface swimmers).

Flat rock mostly bare with some crustose coralline algae. Sparse boulders populated with anemones and some other organisms. Wave action was too large to be able to clearly identify the population structure.

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Robert, Eric and Robert.

 

GPS coordinates site 2: Syy.yyyyy° Exx.xxxxx°

Swam out from coast ~100 m South from site 1. Sandy beach with boulders in intertidal range. Ecklonia found in small but dense groups growing on or next to boulders at a depth of ~ 1-2 m. These plants looked very sad. Snorkel from ~9:30 – 9:50 (Robert S, Robert W and Eric surface swimmers).

Bare sandy  bottom with sparse boulders populated with crustose coralline and some other organisms. Wave action was too large to be able to clearly identify the population structure.

GPS coordinates site 3: Syy.yyyyy° Exx.xxxxx°

Swam out from coast ~100m North from site 1. Ecklonia found as sparse groups growing on the flat rock shelf and around boulders at a depth of ~ 1 m. Snorkel from from ~10:00 – 10:20 (Robert S and Robert W surface swimmers).

Shallow intertidal pool with large boulders protruding from water. Area around boulders mostly covered in sand. Boulders and smaller rocks covered in many different types of algae.

Kalk Bay

Tevya Lotriet collecting specimens for spore release experiments.
Tevya Lotriet collecting specimens for spore release experiments.

Two beds directly next to each other were sampled in Kalk Bay:

GPS coordinates: Syy.yyyyy° Exx.xxxxx°

Divers visited this site on 9 April 2015, and the dive for kelp collections was from 11:13 to 11:24 (Robert S, Robert W: Eric as surface swimmer). The two reefs  visited are situated at a depth of 6.5 and 5.5 m. Only Ecklonia was collected as Laminaria were not present. The bottom topography is a flat rock shelf slowly sloping down with protruding reefs covered in biomass. The reefs have sparse beds of Ecklonia (~20 individuals per bed). The deeper reef was covered in anemones and red bait and had very little to no grazers. The health of the kelp at this reef was poor. Twenty metres closer to shore, the shallower reef was covered with urchins and smaller algae with little to no red bait or anemones. The health of the kelp at this reef was markedly better. Dense populations of brittle stars could be found between reefs.

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