Clear Lake (CLM) is similar to Ongeim'l Tketau (OTM) in depth, size, and
its compliment of most obvious metazoans (sponges, mussels, anemones,
golden jellyfish, gobies, and apogonids). Clear Lake, however, is oriented
north-south rather than east-west, the vertical structure of its water
column differs from that of OTM, and the bacterial plate is much more
diffuse. Although it remains to be demonstrated, circumstantial evidence
suggests these differences influence the population dynamics of the golden
jellyfish which, in contrast to the perennial population in OTM, have
been recorded only sporadically in CLM since the lake was first studied.
In turn, the sporadic appearance of the jellyfish may have influenced
the behavior of the anemone Entamaea medusivora which, in CLM,
can regularly be seen consuming mussels rather than medusae.
Profiles show mean ± one standard error
(4 profiles, Oct. 1979 to Oct. 1998 )
Arrow indicates Secchi disk depth
(mean ± one standard error)
Horizontal shading indicates the approximate position of
the diffuse population of purple-sulphur bacteria.
Crustacea - Oithona sp., Acrocalanus sp.
Teleostei - Acentrogobius janthinopterus, Sphaeramia orbicularis,
Anthozoa - Entacmaea medusivora
Scyphozoa - Mastigias
Bivalvia - Brachidontes sp.
Sources: CRRF unpubl. data; Fautin & Fitt 1991; Hamner & Hamner
1998; Lipps & Langer 1999; G. Paulay pers. comm.; K. Tilbrook pers.