American Malacological Bulletin (AM MALACOL BULL)

Publisher: American Malacological Union

Journal description

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.

Current impact factor: 0.94

Impact Factor Rankings

2016 Impact Factor Available summer 2017
2014 / 2015 Impact Factor 0.939
2013 Impact Factor 0.843
2012 Impact Factor 1
2011 Impact Factor 1.219
2010 Impact Factor 0.948
2009 Impact Factor 0.551
2008 Impact Factor 0.375
2007 Impact Factor 0.441
2006 Impact Factor 0.804
2005 Impact Factor 0.29
2004 Impact Factor 0.538
2003 Impact Factor 0.257
2002 Impact Factor 0.467
2001 Impact Factor 1.176
2000 Impact Factor 0.417
1999 Impact Factor 0.32
1998 Impact Factor 0.375
1997 Impact Factor 0.22
1996 Impact Factor 0.4
1995 Impact Factor 0.367
1994 Impact Factor 0.424
1993 Impact Factor 0.355
1992 Impact Factor 0.263

Impact factor over time

Impact factor

Additional details

5-year impact 1.10
Cited half-life 10.00
Immediacy index 0.07
Eigenfactor 0.00
Article influence 0.36
Website American Malacological Bulletin website
Other titles American malacological bulletin
ISSN 0740-2783
OCLC 9753438
Material type Periodical
Document type Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Many marine invertebrate clades exhibit diverse developmental modes, including planktotrophic, lecithotrophic and direct development. Evolutionary transitions among the developmental modes can be common and may have macroevolutionay consequences. The marine bivalve genus Lasaea (Brown, 1827) is composed of almost exclusively direct developing species, except for one planktotrophic species - Lasaea australis (Lamarck, 1818). To test whether L. australis represents an independent evolution of planktotrophic development or the retention of an ancestral trait, we estimated the ancestral developmental mode for Lasaea using phylogenetic comparative approaches. Our results show that the ancestral developmental mode of Lasaea is likely planktotrophic and multiple independent evolution of direct development has occurred in this genus. The repeated loss of planktotrophic development may be linked to the unusual asexual reproductive mode in Lasaea, but this hypothesis needs to be further corroborated. Our analyses also highlight the importance of using biologically realistic models for ancestral state reconstructions.
    No preview · Article · May 2015 · American Malacological Bulletin
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    ABSTRACT: Around the year 2000, populations of inconspicuous, 5-mm hydrobiid snails were discovered at several semi-isolated marshes around San Francisco Bay, California, where freshwater meets salt water. Coring indicated these are native species, including Tryonia porrecta (Mighels, 1845). The present, long-term monitoring at some of these sites with and without these small snails suggested that these abundances tend to be quite stable, through present 2014 sampling. But the recent, record drought since 2012 risked high salinities in these vulnerable brackish areas, including a site with the normally rare California Brackish Water Snail, Tryonia imitator (Pilsbry, 1899). Sites in presently 100% seawater at Elkhorn Slough on nearby Monterey Bay, once with frequent T. imitator brackish water snails yielded only dead shells during this past 15 years, among large, introduced predatory snails. Yet a more isolated site nearby at 50% seawater yielded small (3 mm) T. imitator brackish water snails observed (live) on green algae among pickleweed, at warm (30 °C) water temperatures, with no other gastropod species, soon after rare rains during the drought, in April, 2014. Isolated marshes may have advantages in slowing colonization of invasive species. Despite vulnerability of semi-isolated brackish-water sites to elevated salt during drought, some sites maintained these native snails (without invasive snails) even after drought.
    No preview · Article · May 2015 · American Malacological Bulletin
  • [Show abstract] [Hide abstract]
    ABSTRACT: Bivalves are one of the most abundant groups of invertebrates in many benthic communities. From 1817 to date, numerous contributions have dealt with the Argentine fauna of marine bivalves. Despite this, at present, there is no a text summarizing the currently available information on this group in Argentine waters. The present contribution aims to provide a synthesis of the current state of knowledge of systematics, geographic distribution, biology, and ecology of the living marine and estuarine species of bivalves from the Argentine coast and its shelf and, based on this information, to analyze the species diversity of these areas. For that, 225 publications, including results of scientific expeditions, systematic revisions, description of new species, new distributional records, checklists, compilations on the diversity for particular areas, and contributions dealing with biological and ecological information, were surveyed. As part of this study, 277 nominal species of bivalves were found reported for the study area, although only 169 of them are currently regarded as valid. The analysis of the available bibliography makes evident that the Argentine bivalves have been overlooked throughout the years. This fact results in several limitations and gaps in the current knowledge of this fauna, which are highlighted in the present revision.
    No preview · Article · May 2015 · American Malacological Bulletin
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    ABSTRACT: Morphological phylogenetic analysis of the mactrid subfamilies Mactrinae and Kymatoxinae, plus the mactroidean family, Anatinellidae, indicate that the Kymatoxinae shares closer common ancestry with the Anatinellidae than with the Mactridae. Kymatoxinae is, therefore, reassigned from Mactridae to subfamily rank within Anatinellidae. The lack of a pallial sinus in Anatinella G. B. Sowerby I, 1833 suggests that its family was derived from anatomically plesiomophic members of Mactroidea with at best only weakly developed siphons.
    No preview · Article · May 2015 · American Malacological Bulletin
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    ABSTRACT: Much is still unknown about why freshwater mussels (Unionidae) are particularly sensitive to environmental change. A better understanding of freshwater mussel metabolism is needed, and the field of environmental metabolomics holds the promise to inform these questions. A number of protocols exist for the extraction of metabolites for identification from animal tissues. As a first step in the application of environmental metabolomics to the study of freshwater mussels, we compared extraction protocols using an inorganic oxidizing acid (perchloric acid), an organic nitrile (acetonitrile), and a salt/water solution (Ringer's solution) to establish an uncomplicated, robust, repeatable and inexpensive tissue extraction protocol for freshwater mussel tissue. Perchloric acid resulted in notable extraction of energy-related nucleotides (AMP/ADP/ATP), yet had the lowest peak count of the three extraction methods and showed poor repeatability. Acetonitrile and Ringer's solution yielded metabolite extraction results similar to each other with Ringer's solution having the greatest number of peaks particularly in the 3.0-4.5 ppm sugar/amino acid range. Ringer's solution is simple to use, safe and consistent and bears consideration when selecting an extraction protocol for 1H nuclear magnetic resonance experiments.
    No preview · Article · May 2015 · American Malacological Bulletin
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    ABSTRACT: Mollusks are among the most diverse and abundant animal groups, inhabiting many aquatic and terrestrial environments. They are important ecosystem engineers, helping to structure aquatic bottom environments and providing habitat, protection, and food to a wide array of other taxa. Mollusks have been historically important to humans in many ways, and are today an economically important group worldwide. As major calcareous organisms with an extensive fossil record, they can provide important information on past climate events and oceanic changes, thus, increasing our understanding of predicted future changes. This paper presents an overview of the use of mollusks in environmental and impact studies, to provide a baseline towards a wider use of this diverse group ( and the valuable collections housed in many museums) as proxies in environmental reconstruction, climate change, ocean warming, and acidification research.
    No preview · Article · May 2015 · American Malacological Bulletin
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    ABSTRACT: In this work, the toxicity of 11 products (three brands of mouthwash, three toothpastes, three detergents and two analgesics) was evaluated in relation to juvenile snails Physa acuta (Draparnaud, 1805). Bioassays of toxicity were conducted and the organisms exposed to six concentrations of each product, along with a control group, to determine the 96-hour LC50 (Lethal Concentration 50). The sensitivity of the gastropods to the different products was determined by comparing their LC50 values to that of acute toxicity values. In addition, the degree of lipoperoxidation in the gastropod tissue was evaluated by measuring the concentration of MDA (malondialdehyde) in sublethal tests (LC10) for chronic toxicity (during 30-day exposure). The toxicity of the products tested varied from highly toxic and harmful (mouthwashes) through harmful (detergents), potentially harmful (analgesics), and non-toxic (toothpastes). The degree of lipoperoxidation observed in the sublethal tests was (from most to least toxic): Analgesics > Mouthwashes > Detergents > Toothpastes. These results indicate that a certain risk exists resulting from the presence in wastewater dumped into aquatic systems of components of these products which may cause adverse effects on populations of P. acuta and other aquatic organisms.
    No preview · Article · May 2015 · American Malacological Bulletin

  • No preview · Article · May 2015 · American Malacological Bulletin