The American Midland Naturalist Journal Impact Factor & Information

Publisher: University of Notre Dame

Journal description

Current impact factor: 0.62

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 0.621
2012 Impact Factor 0.667
2011 Impact Factor 0.619
2010 Impact Factor 0.526
2009 Impact Factor 0.665
2008 Impact Factor 0.755
2007 Impact Factor 0.722
2006 Impact Factor 0.667
2005 Impact Factor 0.768
2004 Impact Factor 0.677
2003 Impact Factor 0.701
2002 Impact Factor 0.585
2001 Impact Factor 0.494
2000 Impact Factor 0.452
1999 Impact Factor 0.5
1998 Impact Factor 0.544
1997 Impact Factor 0.485
1996 Impact Factor 0.564
1995 Impact Factor 0.531
1994 Impact Factor 0.404
1993 Impact Factor 0.5
1992 Impact Factor 0.453

Impact factor over time

Impact factor

Additional details

5-year impact 0.00
Cited half-life 0.00
Immediacy index 0.00
Eigenfactor 0.00
Article influence 0.00
Other titles American midland naturalist (Online), The American midland naturalist
ISSN 1938-4238
OCLC 45446837
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Habitat fragmentation can intensify consumer attack on plants if herbivores stay longer, eat more extensively, or exhibit higher density at low resource availability; it may also reduce attack if consumers are dispersal limited and therefore fail to forage on smaller or more distant patches. Here we test these alternatives with a large-scale grassland fragmentation experiment, comparing vertebrate and invertebrate herbivory on seedlings of an oak species of central North America (Quercus ellipsoidalis) experiencing recruitment difficulties across its range. All seedlings suffered significant herbivore-based defoliation regardless of experimental context, confirming the influence of consumer pressure on recruiting oaks on contemporary landscapes. However, vertebrates and insects responded differently to fragmentation. Vertebrate grazing was unaffected by patch size or isolation – remnants were either periodically visited by foraging deer or colonized by small mammals that occasionally attacked seedlings. In contrast invertebrate consumers significantly reduced seedling growth via the effects of defoliation, but these effects decreased on smaller and more isolated patches. This was associated with a negative influence of patch size on the diversity of herbaceous vegetation, with reduced plant diversity correlated with the reduced abundance and diversity of several generalist insect herbivore groups. Our results demonstrate fragmentation has the potential to affect the identity and intensity of herbivore attack on oaks, although whether the reduced insect attack we observed in isolated remnants is sufficient to increase juvenile survivorship remains to be tested.
    The American Midland Naturalist 04/2015; 173(2):218-228. DOI:10.1674/amid-173-02-218-228.1
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    ABSTRACT: ABSTRACT.–––To determine if manipulation of milkweed’s natural phenology would increase monarch reproduction, strips were mowed in fields in upstate New York in early Jul, late Jul, and mid Aug, 2006, for comparison to an unmowed control. Common milkweed (Asclepias syriaca) was then monitored from Jul 29 through Sep 24 for plant height, vegetative stage, level of herbivory, condition, monarch eggs and larvae, and the position of eggs on leaves and stems. We found that mowing on Jul 1 and 24 spurred the regrowth of milkweed and sustained a more continuously suitable habitat for monarch oviposition and larval development than the control. Mowing on Aug 17 proved too late for recovery of the milkweeds. Significantly more eggs were laid on the fresh resprouted milkweeds than on the older and taller control plants. In the strips mowed on Jul 1, peak egg densities occurred in late Jul; in the strips mowed in late Jul, peak egg densities occurred in early to mid Aug. Depending on the timing of mowing, the milkweed plant height, developmental stage, and condition differed. As predicted, the mowing of fields with Asclepias syriaca extended the monarchs' breeding season and increased overall monarch reproduction. However, timing of mowing was critical and must be determined empirically for different milkweed species and in different locations. This mitigation procedure could be fostered along roadsides, along edges of fields and pastures, in USDA conservation reserve program lands, and along power lines and other rights of way.
    The American Midland Naturalist 01/2015; 173:229-240.
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    ABSTRACT: Celastrus orbiculatus Thunb. (Oriental bittersweet) is an invasive exotic liana introduced to western North Carolina in the late 1800s that has established in forests across the southern Appalachian region. The twining habit of bittersweet is recognized to have negative impacts on tree growth by constricting trunks, overtopping canopies, and increasing the probability of wind and ice damage. Our study was designed to quantify effects of invasion by C. orbiculatus on Liriodendron tulipifera (tulip poplar) growth. We cored trees on invaded sites with both twined and untwined trees to test for above and below ground competition effects of C. orbiculatus and compared growth to nearby uninvaded sites. Contrary to our expectations, we found radial growth increased after invasion. This increase is likely a release response from a disturbance that allowed C. orbiculatus to become establised. There were many historical ice storms that occured in our region during the time of C. orbiculatus invasion that may have helped it to become established in these stands. Liriodendron tulipifera are known to respond positively after ice storm thinning and this release may mask any initial negative effects of liana competition. The short duration of our study may not have been long enough to capture the transition from the effect of canopy release due to disturbance to competition with C. orbiculatus.
    The American Midland Naturalist 07/2014; 172(1):25-36. DOI:10.1674/0003-0031-172.1.25
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    ABSTRACT: In Wisconsin white-footed mice (Peromyscus leucopus noveboracensis) and woodland deer mice (P. maniculatus gracilis) are difficult to distinguish. Recent climatic trends have facilitated encroachment of P. leucopus north into the range of P. maniculatus, necessitating unambiguous species identification as researchers begin to untangle the ecological implications of such community changes. Cranial and external measurements have been used by previous investigators to differentiate these species in other regions. However, because large geographic morphological variation occurs and most previous studies used measurements from dead specimens, definitive morphological characteristics need to be identified that can quickly and effectively classify live Wisconsin Peromyscus in the field. During the summer of 2010, we collected tissue samples and measured ear length, tail length, hindfoot length, and body weight of 84 P. maniculatus and 293 P. leucopus live-trapped in six Wisconsin counties. We used mDNA analysis to identify species. We developed discriminate function analysis (DFA) equations to identify characteristics that best distinguished species. Ear length correctly classified 97.9% of the samples with all but one P. leucopus <17 mm and all but seven P. maniculatus ≥17 mm. By adding body weight to the function, we were able to achieve 99.2% classification accuracy and with the addition of tail length were able to achieve 99.5% accuracy.
    The American Midland Naturalist 01/2014; 171(1):139-146.
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    ABSTRACT: Carnivorous plants inhabit nutrient-poor soils and capture insects to supplement the nutrients that can be acquired from the soil. However, most carnivorous plants also utilize insect pollinators, potentially leading to a “pollinator-prey conflict.” The phenology of pitcher and flower development in Sarracenia alata was examined in order to determine whether this species might avoid pollinator-prey conflict by phenological differences in the production and activity of flowers and traps. In two sites examined in different years, the phenological patterns of flower and pitcher development were significantly different. Less than one percent of plants had flowers and pitchers active at the same time. These phenological differences in activity patterns of flowers and pitchers result in little opportunity for pollinator-prey conflict in this species but may have evolved for other reasons.
    The American Midland Naturalist 01/2014; 171(1):153-156. DOI:10.1674/0003-0031-171.1.153
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    ABSTRACT: Describing fish habitat associations and their relevance to conservation remains a central challenge in stream fish ecology. Unfortunately, there are limited opportunities to investigate these associations in unaltered systems and identify critical habitats used by native fishes. Investigation of fish habitat associations in tallgrass prairie is especially vital, owing to their widespread destruction. Our study aim was to identify habitat factors associated with the distribution and density of fishes in two protected tallgrass prairie stream watersheds in eastern Kansas: Kings Creek on the Konza Prairie Biological Station (KPBS) and Fox Creek on the Tallgrass Prairie National Preserve (TPNP). We sampled fishes and measured eight habitat variables at three sites on KPBS (2006-2011) and four sites on TPNP (2008-2011). Multiple regression suggested that species richness was positively associated with pool area (partial r = 0.70) and discharge (partial r = 0.50) in Fox Creek (df = 15, Adj. R-2 = 0.60, P < 0.001). In Kings Creek, species richness was only associated with pool area (df = 17, R-2 = 0.44, P < 0.001). Redundancy analyses showed common prairie fish species exhibit ontogenetic habitat associations, partitioning adults in deep and juveniles in shallow pools. Strong species area relationships in these minimally altered systems indicates large volume habitats have greater species richness, suggesting water diversions or extractions that reduce habitat are likely to cause declines in native biodiversity.
    The American Midland Naturalist 07/2013; 170(1):39-51. DOI:10.1674/0003-0031-170.1.39
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    ABSTRACT: We examined nest success and nest site selection of red-headed woodpeckers (Melanerpes erythrocephalus) in east-central Illinois. Overall nest success, estimated from a constant survival logistic-exposure model, was 56%. Cavities at greater height had greater success and daily survival rates increased with nest age. We also compared habitat variables at nest and random sites. Red-headed woodpeckers nested more frequently in snags than expected and habitat surrounding nest cavity trees had more cavities than habitat surrounding random trees, which were generally taller than nest cavity trees. Thus, the immediate preservation or creation of large diameter snags and snags high above the ground will likely improve nesting habitat and nest success of red-headed woodpeckers.
    The American Midland Naturalist 07/2013; 170(1):86-90. DOI:10.1674/0003-0031-170.1.86