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Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1925 1
1932 1
1936 1
1938 1
1939 1
1942 3
1944 12
1945 242
1946 1289
1947 1393
1948 1153
1949 952
1950 1330
1951 1779
1952 1686
1953 1664
1954 1295
1955 1412
1956 1296
1957 1323
1958 1328
1959 1253
1960 1229
1961 1178
1962 1149
1963 2563
1964 5182
1965 5258
1966 5998
1967 6912
1968 7873
1969 8589
1970 8501
1971 9355
1972 10137
1973 11794
1974 12629
1975 13970
1976 14008
1977 13999
1978 16573
1979 18407
1980 16181
1981 14470
1982 15695
1983 17746
1984 18448
1985 18658
1986 19330
1987 20382
1988 22318
1989 23354
1990 24336
1991 26184
1992 27239
1993 28326
1994 29179
1995 29856
1996 28546
1997 30406
1998 32963
1999 32800
2000 32663
2001 35308
2002 37434
2003 39286
2004 42100
2005 43208
2006 44069
2007 45482
2008 45558
2009 45742
2010 49418
2011 52052
2012 53271
2013 54136
2014 55118
2015 55939
2016 55382
2017 53699
2018 49435
2019 21121
2020 502
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1,511,822 results
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Page 1
Genus Camptocercus (Cladocera: Anomopoda: Chydoridae) in North America.
Sinev AY. Zootaxa 2018. PMID 30314128
Genus Camptocercus is represented in North America by four species. Camptocercus rotundus Herrick, 1882 is proved to be a valid species and is redescribed here. ...C. rotundus is distributed in South Canada and North USA from Pacific to Atlantic coast, whereas C. dadayi is found in Mexico and South-East USA. ...
Genus Camptocercus is represented in North America by four species. Camptocercus rotundus Herrick, 1882 is proved to be a vali …
Decreasing Vanadium Footprint of Bunker Fuel Emissions
Spada NJ, et al. Environ Sci Technol 2018. PMID 30203968 Free article.
Multiple regulations on the fuel used by marine vessels were implemented in North America since 2010, and the most sweeping regulation was implemented at the start of 2015. The 2015 regulations reduced the allowable fuel oil sulfur concentrations within the North America Emissions Control Area from 1.0% to 0.1% to reduce the environmental and human health impacts of sulfates. ...
Multiple regulations on the fuel used by marine vessels were implemented in North America since 2010, and the most sweeping re …
Limited contributions of released animals from zoos to North American conservation translocations.
Brichieri-Colombi TA, et al. Conserv Biol 2019 - Review. PMID 29923231
We searched for mention of captive breeding and zoo involvement in all 1863 articles included in the North American Conservation Translocations database, which comprises journal articles and grey literature published before 2014 on conservation translocations in Canada, the United States, Mexico, the Caribbean, and Central America before 2014 as identified by a comprehensive literature review. ...The 40 species of animals bred for release by zoos represented only 14% of all animal species for which conservation translocations were published and only 25% of all animal species that were bred for releases occurring in North America. ...
We searched for mention of captive breeding and zoo involvement in all 1863 articles included in the North American Conservation Tran …
Comprehensive taxonomic, faunistic, biological, and geographic inventory and analysis of the Sciomyzidae (Diptera: Acalyptratae) of the Delmarva region and nearby states in eastern North America.
Murphy WL, et al. Zootaxa 2018. PMID 30313251
Euthycera flavescens (Loew) is resurrected; Renocera cressoni Mathis and Knutson sp. nov. is described from eastern North America; R. amanda Cresson is given new status as a junior synonym of R. longipes (Loew); and Chaetomacera brevis Cresson, R. cyathiformis Melander, R. pacifica Curran, and R. bergi Steyskal are given new status as junior synonyms of R. striata (Meigen). ...Provided for each genus and species are annotated taxonomic/nomenclatorial catalogs of all North American references to all species, with generic combinations noted, with previously unrecorded synonymies as well as North American literature references, illustrations, and information on natural history and morphology of immature stages. ...
Euthycera flavescens (Loew) is resurrected; Renocera cressoni Mathis and Knutson sp. nov. is described from eastern North America
400-Year Record of Atmospheric Mercury from Tree-Rings in Northwestern Canada
Clackett SP, et al. Environ Sci Technol 2018. PMID 30070840
This study provides a novel long-term Hg(0) reconstruction in the Western subarctic from one of the most widely distributed boreal tree species in North America and, therefore this proxy may also hold potential for investigating broader spatial patterns in Hg(0) cycling across the subarctic and northern boreal forest....
This study provides a novel long-term Hg(0) reconstruction in the Western subarctic from one of the most widely distributed boreal tree spec …
Delineating and identifying long-term changes in the whooping crane (Grus americana) migration corridor
Pearse AT, et al. PLoS One 2018. PMID 29447213 Free PMC article.
Historic sightings of migrating whooping cranes (Grus americana) have served as sole source of information to define a migration corridor in the Great Plains of North America (i.e., Canadian Prairies and United States Great Plains) for this endangered species. ...
Historic sightings of migrating whooping cranes (Grus americana) have served as sole source of information to define a migration corridor in …
Review of the Nearctic (north of Mexico) species of Elacatis Pascoe (Coleoptera: Salpingidae: Othniinae).
Pollock DA. Zootaxa 2018. PMID 30313530
The North American (north of Mexico) species of Elacatis were revised, based on external and genitalic structures of adults. ...The following new synonym is proposed: Othnius umbrosus LeConte 1861 = Othnius lugubris Horn 1868; therefore, only E. umbrosus (LeConte) is associated with dead/dying conifers in western North America. ...
The North American (north of Mexico) species of Elacatis were revised, based on external and genitalic structures of adults. . …
Local vs. Regional Groundwater Flow Delineation from Stable Isotopes at Western North America Springs.
Springer AE, et al. Ground Water 2017. PMID 27439144
We tested this local vs. regional flow derived hypothesis with data from a new, large springs isotopic database from studies across Western North America in Arizona, Nevada, and Alberta. ...
We tested this local vs. regional flow derived hypothesis with data from a new, large springs isotopic database from studies across Western …
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