Dear Harry
Thanks for your detailed reply to my query.
It is clear that (probably all) Olivella are carnivores and that is
reasonably well documented as you indicate. However, there are several
accounts that suggest mucus trap feeding occurs in both east and west coast
species. For example Ruppert & Fox Seashore animals of the SE Atlantic Coast
mention O mutica making mucus nets from the foot to collect food and that
these are periodically ingested. There are also other reports that indicate
that O. semistriata feeds in this way too. It seems likely that if this
mode of feeding is used it is probably supplementing carnivorous feeding.
In another departure from the norm, Hickman & Lipps reported selective foram
ingestion by an Olivella species (J Foraminiferal Res 13: 108-114).
Thanks again for your help
Best wishes
Winston Ponder
From: Conchologists List [mailto:[log in to unmask]] On Behalf Of
Harry G. Lee
Sent: Sunday, 19 April 2009 8:14 AM
To: [log in to unmask]
Subject: Re: [CONCH-L] feeding in Olivella
Dear Dr. Ponder,
I've not read of mucous net feeding in Olivella in our part of the world,
and it appears not to be principal in some species/ecosystems.
The Marcuses (1959: 104) described the rather voracious feeding on Donax
hanleyanus Philippi, 1842 [= D hilairea Guerin, 1832] by Olivella verreauxii
(Duclos, 1835) [not = O. minuta (Link, 1807)] and discuss stomach contents
of the predator, in which the former bivalve was principal and which
included forams, copepods, amphipods, and scaphopods. The presence of
diatoms in the feces was attributed to the gut contents of prey rather than
direct consumption. They cite similar observations by Ankel "(1938, p.
276)," but there is no such reference in their bibliography.
Dall (1889: 134) attested to the appetite of O. mutica (Say, 1822): "It is
very voracious, and will swallow whole a young mussel one third its own
length."
Perhaps other species do it differently and/or feeding strategies change
when prey is less available.
Harry
Dall, W. H., 1889. Reports on the results of dredging, under the supervision
of Alexander Agassiz, in the Gulf of Mexico (1877-78) and in the Caribbean
Sea (1879-80), by the by the U. S. Coast Survey Steamer “Blake,”
Lieut.-Commander C. D. Sigsbee, U. S. N., and Commander J. R. Bartlett, U.
S. N., commanding. XXIX. Report on the Mollusca. Part 2, Gastropoda and
Scaphopoda. Bull. Mus. Comp. Zool. 18: 1-492 + pls. 10-40.
Duclos, P.L., 1835. Genre Olive. Histoire Naturelle Générale et Particulière
de tous les Genres de Coquilles Univalves Marines Institut de France: Paris.
[vi] + pls. 1-33, 4 bis, 18 bis.
Link, H. F., 1807. Beschreibung der Naturalien-Sammlung der Universitat zu
Rostock 2. Rostock, Germany. [ii] + 51-100.
Marcus, Ev. and Er. Marcus, 1959. Studies on Olividae. Universidade de Sao
Paulo Faculdade de Filosofia, Ciencias e Letras. 232 Zoologica 23: 99-187.
At 05:06 PM 4/18/2009, you wrote:
There are several references to mucous net feeding in various species of
Olivella spp in the literature but I have not been able to find a detailed
account of this feeding mechanism, nor any illustrations. Can anyone suggest
a useful reference?
Many thanks
Winston Ponder
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