Reproductive cycles and fecundities of two species of siphonaria (Mollusca: Pulmonata) in South-Eastern Australia

R. G. Creese

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The reproductive cycles of Siphonaria denticulata and S. virgulata were determined by measuring the length or weight of the spawn of each species. S. denticulara lays a typical. coiled, gelatinous egg ribbon, cemented to the rocky substratum. S. virgulata lays a globular egg mass which is released directly into the water. This latter form of spawning is apparently unique amongst pulmonate molluscs. S. denticulata has a long breeding season, extending from November-December to the following April-May. Spawning usually occurs every 2 weeks for large adults, but smaller (i.e. younger) limpets spawn less frequently. Periods of spawning correspond to periods of full or new moons. The exact length of the breeding season of S. virgulata is unknown. Estimates of fecundity were obtained from counts of eggs within egg masses. There were differences in the fecundity of S. denticulata between localities, but S. denticulata and S. virgulata from the same locality had similar fecundities for similar-sized animals. Egg ribbons of S. denticulata experimentally placed high on the shore were found to suffer higher mortality from desiccation than those lower on the shore. This may explain why S. virgulata, which generally lives higher on the shore than its congener, has pelagic egg masses.

LanguageEnglish
Pages37-47
Number of pages11
JournalMarine and Freshwater Research
Volume31
Issue number1
DOIs
Publication statusPublished - 1980
Externally publishedYes

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reproductive cycle
Mollusca
egg masses
fecundity
spawning
egg
breeding season
molluscs
desiccation
mollusc
Moon
animals
water
mortality
animal

Cite this

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abstract = "The reproductive cycles of Siphonaria denticulata and S. virgulata were determined by measuring the length or weight of the spawn of each species. S. denticulara lays a typical. coiled, gelatinous egg ribbon, cemented to the rocky substratum. S. virgulata lays a globular egg mass which is released directly into the water. This latter form of spawning is apparently unique amongst pulmonate molluscs. S. denticulata has a long breeding season, extending from November-December to the following April-May. Spawning usually occurs every 2 weeks for large adults, but smaller (i.e. younger) limpets spawn less frequently. Periods of spawning correspond to periods of full or new moons. The exact length of the breeding season of S. virgulata is unknown. Estimates of fecundity were obtained from counts of eggs within egg masses. There were differences in the fecundity of S. denticulata between localities, but S. denticulata and S. virgulata from the same locality had similar fecundities for similar-sized animals. Egg ribbons of S. denticulata experimentally placed high on the shore were found to suffer higher mortality from desiccation than those lower on the shore. This may explain why S. virgulata, which generally lives higher on the shore than its congener, has pelagic egg masses.",
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Reproductive cycles and fecundities of two species of siphonaria (Mollusca : Pulmonata) in South-Eastern Australia. / Creese, R. G.

In: Marine and Freshwater Research, Vol. 31, No. 1, 1980, p. 37-47.

Research output: Contribution to journalArticleResearchpeer-review

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