Feeding Ecology of Astrohippus stockii from the Late Hemphillian of Central Mexico: Stable Carbon Isotopes Analysis and Dental Wear Patterns (original) (raw)
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The First 30 Years of the Journal of Crustacean Biology – A Bibliometric Study
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This review examines some of the characteristics and highlights some notable articles of the Journal of Crustacean Biology (JCB) in its first 30 years of existence. A total of 2052 articles appeared in JCB from the first issue in February 1981 to the end of 2009. The number of articles by volume increased from 50 in 1981 to 93 in 2002 and then declined to around 70. From 1981 to 2009, article size varied around a mean of 11 pages (pre-2005 format) but mean number of authors and references by article increased by a factor of 1.87 and 2.20, respectively. JCB content is predominated numerically by taxonomy and systematics (36% of all articles), but other research areas (anatomy, physiology, development, growth-reproduction, life history, behavior, ecology, conservation) were also represented from the outset. JCB's 2-year impact factor increased significantly from 1991 to 2009. Longer-term impact of JCB is evident in the fact that almost half of all JCB articles were cited in 2009 and that the mean age of those cited articles was only slightly less than the mean age of all JCB articles (12.6 vs 13.3 years). However, citations to JCB differ widely across research areas, with articles in taxonomy cited on average at less than half the rate of articles in the areas of ecology or conservation. The most cited JCB articles by combination of research area and decade of publication deal primarily with higher crustaceans (malacostracans) and are reviews or original research articles with cross-disciplinary appeal.
Northwestern Naturalist, 2011
BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research.
Revista Mexicana de Ciencias Geológicas
Stable carbon and oxygen isotopes were determined in molar enamel from fossil Pliocene equids from Rancho El Ocote in the San Miguel Allende basin, Guanajuato, and from Santa María, Tecolotlán basin, Jalisco. At each locality, the source was one molar from an individual Dinohippus mexicanus and one molar from an individual Neohipparion eurystyle. Results indicated that the N. eurystyle individuals from both localities had been C3/C4 mixed feeders, and had lived in open-zone vegetation (δ13C: -3.1‰ to -1.3‰; δ18O: -4.9‰ to -6.4‰). On the other hand, the D. mexicanus from Rancho El Ocote had fed upon C4 plants and lived in open zones (δ13C: -1.3‰; δ18O: -4.9‰), whereas the D. mexicanus from Santa María was a C3/C4 mixed feeder with considerable consumption of C3 plants (δ13C: -7.7‰; δ18O: -6.4‰). These results could be contrast to suggestions from previous isotopic work that D. mexicanus in Mexico predominantly fed on C4 plants and further samples analyses are warranted. This study co...
Marine mammal research in South America: 30 years of publication efforts and collaborative networks
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A notable diversity of marine mammals inhabits the Atlantic and Pacific waters of South America. For decades, South American countries have been producing scientific research focused on these species. However, still, there is no systematic assessment of the magnitude and main subjects on which this research has been focused. This study analyzes the trends and patterns in scientific research on marine mammals in South America, evaluating a pool of bibliometric indicators and mapping collaborative relationships among countries, authors, and research areas. Academic documents were retrieved from two bibliographic databases: SCOPUS and SciELO, from 1990 to 2020. Results showed a gradual increase in publications along the three study decades. Brazil played a central role in the number of publications in both databases, followed by Argentina and Chile. The South American publications on marine mammals were centralized in a small number of journals, and few authors were responsible for a large proportion of contributions. The authors showed a moderate level of collaboration, mainly reflecting stronger links among neighbor countries, including co-authorships with North American and European countries. The most frequent keywords reflected three clusters centered in taxonomic groups (Cetacea, Odontoceti, and Pinnipedia) and two centered in research subjects (pollution and phylogenetics). The scope of the contributions differed among collections. Nevertheless, both databases were complementary and contributed to show marine mammals' research in South America.
Challenges and Perspectives for Studies on Home Range of Lizards from South America
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