American Malacological Bulletin (AM MALACOL BULL )

Publisher: American Malacological Union


The American Malacological Bulletin (AMB), published twice each year, contains peer-reviewed contributed articles and symposium papers. Special Editions of the Bulletin, containing topics of exceptional interest, are published as supplements.

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Publications in this journal

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    ABSTRACT: The population structure of three endemic land snail species of the genus Discula (Lowe,1831) on the archipelago of Madeira were studied. Ten allozyme loci were screened in 13 populations (11 from Madeira Island and two from the adjacent Desertas Islands) of D. polymorpha (Lowe, 1831), two populations of D. attrita (Lowe, 1831) and one population of D. calcigena (Lowe, 1831) from Porto Santo Island. All populations, except those from the Desertas, showed high levels of genetic variability. Deviation from Hardy-Weinberg equilibrium due to heterozygote defi ciency was detected in all D. polymorpha populations from Madeira and populations of D. attrita. This defi ciency was mainly attributed to inbreeding within the populations. No heterozygote defi ciency was found in D. calcigena, probably due to the larger population size of this species in the recent past. The FST values were signifi cant in many pairwise comparisons between the populations of D. polymorpha, with the highest values occurring between populations from Deserta Grande and the peninsula of Madeira. All interspecifi c FST values were highly signifi cant. FST values between populations of D. polymorpha from Deserta Grande and the Madeiran peninsula were comparable to observed interspecifi c values. Based on the factorial analysis all Madeiran populations grouped together, the populations from Deserta Grande formed a separate group, while the two populations of D. attrita show clear structuring.
    American Malacological Bulletin 01/2014; 1(32):52 - 61.
  • American Malacological Bulletin 01/2013; 31(2):289-296.
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    ABSTRACT: Zidona dufresnei Donovan, 1823 is an endemic snail of the southwestern Atlantic Ocean. In San Antonio Bay, Río Negro Province, it is commonly found in the intertidal zone all year round and from October to April the females deposit planoconvex egg capsules attached to hard substrates. The population of Z. dufresnei studied is an exception because it is unique in that inhabits shallow waters. The main goal of this study was to determine the duration of the direct intracapsular development of Z. dufresnei in the fi eld. Results show that the intracapsular development takes 34.5 ± 3.8 days. In late developmental stages, a mean of three embryos per capsule was observed. Developmental duration under natural conditions was shorter than in lab conditions previously studied. The shorter developmental period than that reported for other temperate neogastropods may be related to the high summer water temperatures and high salinity at the location studied. Shorter embryonic duration would be important for this population of Z. dufresnei which inhabits an environment of high predation pressure on egg capsules.
    American Malacological Bulletin 01/2013; 31(1):85-89.

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