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: 0.84

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 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
Year

Additional details

5-year impact 0.87
Cited half-life 0.00
Immediacy index 0.38
Eigenfactor 0.00
Article influence 0.27
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: This report provides information on 28 specimens of the giant squid, Architeuthis dux (Steenstrup 1857), discovered in the western North Atlantic Ocean between Newfoundland and the Gulf of Mexico. Some specimens have been reported in the press or popular literature, but others are recorded herein for the first time. Nominal architeuthid species are provided as well as tables listing repositories of types of nominal species, and repositories of non-type specimens from the study area. An extensive list of references of pertinent regional literature is provided, and recommendations for fixation and preservation are described.
    American Malacological Bulletin 03/2015; 33(1):78-88.
  • [Show abstract] [Hide abstract]
    ABSTRACT: This report provides information on 28 specimens of the giant squid, Architeuthis dux (Steenstrup 1857), discovered in the western North Atlantic Ocean between Newfoundland and the Gulf of Mexico. Some specimens have been reported in the press or popular literature, but others are recorded herein for the first time. Nominal architeuthid species are provided as well as tables listing repositories of types of nominal species, and repositories of non-type specimens from the study area. An extensive list of references of pertinent regional literature is provided, and recommendations for fixation and preservation are described.
    American Malacological Bulletin 03/2015; 33(1):78-88. DOI:10.4003/006.033.0116
  • [Show abstract] [Hide abstract]
    ABSTRACT: The anatomies of two species of Neoleptonidae are described. Clearly heterodont with cardinal and lateral hinge teeth, the shell also has an internal, parivincular ligament. Shell form suggests a shallow burrowing mode of life in coarse gravels in coastal waters. The labial palps are small and the intestine short further suggesting deposit feeding in well-sorted gravels. A pronounced prodissoconch (II) with a marginal ridge argues for lecithotrophic development further facilitating re-colonization of a narrow niche. In most anatomical respects, the two species are simplified with conjoined inhalant and pedal apertures and few posterior sensory mantle papillae. The ctenidia comprise subequal demibranchs with the outer reduced and the inner modified for internally fertilized embryo brooding. The attachment of each embryo chord to the demibranch filaments is probably from secretions produced by basal glands developed on their abrofrontal surfaces. There may also be secondary external pallial brooding, accounting for the ridged prodissoconch II with attachment achieved via secretions from oil glands in the mantle margin. Comparisons are made with representatives of the earliest-considered affiliates of the Cyamioidea, that is, the Arcticoidea [now rejected], the confamilial Gaimardiidae and Cyamiidae, and the recently suggested Ungulinidae. It is considered that although neoteny has been proposed for the Turtoniidae, Sportellidae, and Neleptonidae to explain cyamioidean small size, anatomical features of the studied species of the latter family herein investigated suggest, rather, that they are simply ‘small’ there being, contrary to the conclusions of others, little evidence of paedomorphosis. In this scenario, smallness is not a reflection of neoteny. It is the evolutionary selection of a life history trait and opted recipe for success. Notwithstanding, earlier suggestions of an affiliation with the Veneroidea are considered plausible, although no reason is seen for not retaining the superfamily Cyamioidea nor its, as contemporaneously recognized, families, including the Neoleptonidae.
    American Malacological Bulletin 03/2015; 33(1):1-21. DOI:10.4003/006.033.0106
  • [Show abstract] [Hide abstract]
    ABSTRACT: Here I present notes on two new species recently found in the upper freshwater portion of the Hudson River, Floridobia winkleyi (Pilsbry, 1912) and Valvata lewisi (Currier, 1868) collected during a study in 2008 (Coote and Strayer 2009, Strayer et al. in prep). Floridobia winkleyi is not only a new record for the river but its presence represents a significant expansion of its limited range from Connecticut to Maine (Smith 1994) and brings into question previously identified specimens attributed to Marstonia lustrica (Pilsbry, 1890) in the river. The other new record is the New York state listed species Valvata lewisi. All species found during the 2008 survey are reported here as well.
    American Malacological Bulletin 03/2015; 33(1):114-117. DOI:10.4003/006.033.0104
  • American Malacological Bulletin 03/2015; 33(1):43-51. DOI:10.4003/006.033.0102
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    ABSTRACT: The green-lipped mussel (Perna canaliculus Gmelin, 1791) is an economically and ecologically important marine species within New Zealand, yet the ability of adult mussels to cope with acute temperature change remains unknown. To address this, we sought to characterize the thermotolerance capacity of P. canaliculus adults and, using metabolomics, identify any metabolic biomarkers of thermal stress in this species. To achieve this, mussels were exposed to a 3 h acute temperature challenge using temperatures of 20 °C (Ambient), 25 °C, 29 °C, 31 °C, 33 °C, and 35 °C. No mortality was observed in mussels exposed to 31 °C or less, even after 30 days recovery. However, mussels exposed to 33 and 35 °C exhibited 100% mortality within 48 h of the challenge. Gill tissues were harvested from mussels for metabolomic analysis of thermal stress biomarkers via Gas Chromatography-Mass Spectrometry (GC-MS). Discriminant Function Analysis (DFA) of 52 metabolites identified eight key biomarkers indicative of thermal stress in this species (i.e., cis-11-Eicosenoic acid, Palmitic acid, Proline, GABA, Aspartic acid, Fumaric acid, beta-Alanine and Asparagine). These metabolites were entirely consistent in their ability to classify the exposure temperature that mussels experienced, indicating that the discriminatory capacity of these biomarkers was strong. Therefore, our results reveal that mortality in thermally-stressed adult P. canaliculus seems assured once temperatures reach 33 °C. Additionally, metabolite biomarkers can discriminate those mussels exhibiting varying levels of thermal stress; thus, metabolomics offers a new tool for physiologists seeking to gain greater mechanistic understanding of the effects of acute thermal stresses on invertebrate species.
    American Malacological Bulletin 03/2015; 33(1):127-135. DOI:10.4003/006.033.0110
  • American Malacological Bulletin 03/2015; 33(1):121-126. DOI:10.4003/006.033.0114
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    ABSTRACT: Dosidicus gigas (d'Orbigny, 1835) is a large, active squid that undergoes a diel vertical migration in the Eastern Tropical and Temperate Pacific. It is a voracious predator on zooplankton and micronekton and supports a large fishery. It is further preyed upon by large vertebrate predators, including whales. Its horizontal distribution is closely tied to productive upwelling regions that are characterized by strong oxygen minimum zones (OMZs). The apparent association with extreme hypoxia is surprising given its large size and high oxygen demand. As part of its daily vertical migration, D. gigas experiences daily temperature changes of 15-20°C, oxygen partial pressures ranging from near anoxia (< 0.8 kPa) to air-saturation (21 kPa) and pH changes from ∼8.1 to < 7.6 at depth. Oxygen minimum zones are believed to be expanding due to climate change, with minimum oxygen levels in the core of the OMZ declining and the low oxygen horizon shoaling. Simultaneously, surface waters are becoming more acidic and temperatures are rising. Here I review the extensive studies of this species that have been conducted over the past decade. D. gigas has a high affinity respiratory protein in the blood that supports a low critical oxygen partial pressure (3.8 kPa at 20 °C) and aerobic survival at night in the upper 200 meters of the water column. A pronounced pH- and temperature sensitivity of oxygen binding promotes oxygen transport across a depth range and in support of high rates of oxygen utilization but may impose constraints on high-temperature and CO2 tolerance. At its deeper, colder daytime habitat depth, D. gigas undergoes a pronounced metabolic suppression. Reduced activity levels and an apparent suspension of transcription and translation contribute to a ∼80% reduction in oxygen demand under 1% oxygen (0.8 kPa at 10 °C). Anaerobic metabolic pathways contribute some energy under these conditions. This metabolic suppression likely limits feeding at depth. Sub-critical oxygen levels, rather than temperature, predator avoidance or prey availability, appear to set the daytime depth distribution. Thus, expanding oxygen minimum zones will alter the daytime depth of peak abundance for these squids while ocean acidification and warming may impose a shallow ceiling above which squid performance is limited. The role of climate change in setting the vertical and horizontal distribution of the species is discussed.
    American Malacological Bulletin 03/2015; 33(1):161-173. DOI:10.4003/006.033.0113
  • [Show abstract] [Hide abstract]
    ABSTRACT: Clione limacina (Phipps, 1774) was attained from a broad bipolar distribution in latitudes of 40°N and 40°S. So far southern populations have been described as a subspecies and even a separate species based on morphological and physiological characters. In this study we found a 23.17% (± 0.59%) difference in cytochrome c oxidase subunit I (COI) gene sequences between C. limacina collected from the Arctic and Antarctic oceans. Our work indicates that Clione limacina from the Southern and Northern Hemisphere are not genetically similar enough to represent a single bipolar species and confirms their separate taxonomic status on molecular level.
    American Malacological Bulletin 02/2015; 33(1):118-120. DOI:10.4003/006.033.0108