1,721,186 research outputs found
Earthworms in natural grasslands and agropastoral systems in the Brazilian Pampa
No full textGillanders, Stephen M.G., Podgaiski, Luciana R., Overbeck, Gerhard E., Santos, Alessandra, Winck, Bruna, Brown, George G., Bartz, Marie L.C. (2023): Earthworms in natural grasslands and agropastoral systems in the Brazilian Pampa. Zootaxa 5255 (1): 377-388, DOI: 10.11646/zootaxa.5255.1.30, URL: http://dx.doi.org/10.11646/zootaxa.5255.1.3
Late-Holocene fire history in a forest-grassland mosaic in southern Brasil: Implications for conservation
No full textQuestion: Is the diverse mosaic of forest/grassland (Campos) vegetation on the hills in the Porto Alegre region natural or of anthropogenic origin? What are the best approaches to management and conservation of forest/grassland mosaics in southern Brazil? Location: 280 m a.s.l., Rio Grande do Sul State (30 degrees 04'32"S; 51 degrees 06'05"W, southern Brazil. Methods: A 50-cm long radiocarbon dated sediment core from a swamp on Morro Santana was analysed for pollen and charcoal, and multivariate data analysis was used to reconstruct past vegetation and fire dynamics. Results: The formation of swamp deposits is related to a change to wetter climatic conditions since 1230 cal yr BP. The diverse forest/grassland mosaic existed already at that time and can be seen as natural in origin as it has been also shown from other studies n southern Brazil. Since 580 cal yr BP, forests expanded continuously. The marked higher occurrence of the pioneer Myrsine during the last 70 years, indicates a change in the disturbance regime. In the past, vegetation has been influenced by mostly anthropogenic fire, set first by Amerindians and later by European settlers. Conclusions: Management for conservation of forest/grassland mosaics should take into account, first, that grasslands are remnants of earlier drier Holocene periods and not a result of deforestation and, second, the history of disturbance by grazing and ire. Suppression of grazing and burning has likely resulted in a trend towards more woody vegetation under modern wet climatic conditions. If management for conservation excludes fire, the present grassland patches will tend to disappear due to forest expansion under the modern humid climate. Maintaining or reintroducing cattle grazing in conservation areas could be an alternative to fire
Amynthas corticis
No full textAmynthas corticis (Kinberg) BRRS0361 (4 individuals), in soil 0-20 cm depth in riparian forest with native grassland at Vinícola Almadén, Santana do Livramento /RS (-30.806795350534102 -55.38431376675352, 186 masl); 15 January 2021, M.L.C. Bartz, A.A. Cuesta, colls.Published as part of Gillanders, Stephen M. G., Podgaiski, Luciana R., Overbeck, Gerhard E., Santos, Alessandra, Winck, Bruna, Brown, George G. & Bartz, Marie L. C., 2023, Earthworms in natural grasslands and agropastoral systems in the Brazilian Pampa, pp. 377-388 in Zootaxa 5255 (1) on page 381, DOI: 10.11646/zootaxa.5255.1.30, http://zenodo.org/record/774505
Glossoscolex riograndensis subsp. nativus Bartz & James
No full textGlossoscolex riograndensis nativus Bartz & James BRRS0277 (3 individuals), in soil 0-20 cm depth in riparian forest with native grassland at Vinícola Almadén, Santana do Livramento /RS (-30.806795350534102 -55.38431376675352, 186 masl); 14 January 2021, M.L.C. Bartz, A.A. Cuesta Hermira, colls.Published as part of Gillanders, Stephen M. G., Podgaiski, Luciana R., Overbeck, Gerhard E., Santos, Alessandra, Winck, Bruna, Brown, George G. & Bartz, Marie L. C., 2023, Earthworms in natural grasslands and agropastoral systems in the Brazilian Pampa, pp. 377-388 in Zootaxa 5255 (1) on page 380, DOI: 10.11646/zootaxa.5255.1.30, http://zenodo.org/record/774505
Urobenus brasiliensis Benham 1886
No full textUrobenus brasiliensis Benham BRRS0278 (4 individuals), in soil 0-20 cm depth in riparian forest with native grassland at Vinícola Almadén, Santana do Livramento /RS (-30.806795350534102 -55.38431376675352, 186 masl); 14 January 2021, M.L.C. Bartz, A.A. Cuesta Hermira, colls. Glossoscolecidae - juveniles BRRS0273 (1 individual), in soil 0-20 cm depth in agropastoral farming system, Alegrete/RS (ICL5, -29.7872222 -55.35611111, 161 masl); 18 January 2021; M.L.C. Bartz, S.M.G. Gillanders, A.A. Cuesta Hermira, A. de Miranda, D.M. Marques, L. Hammes Dadalt, colls.Published as part of Gillanders, Stephen M. G., Podgaiski, Luciana R., Overbeck, Gerhard E., Santos, Alessandra, Winck, Bruna, Brown, George G. & Bartz, Marie L. C., 2023, Earthworms in natural grasslands and agropastoral systems in the Brazilian Pampa, pp. 377-388 in Zootaxa 5255 (1) on page 380, DOI: 10.11646/zootaxa.5255.1.30, http://zenodo.org/record/774505
Glossoscolex undetermined
No full textGlossoscolex sp. 51 BRRS0266 (1 individual), in soil 0-20 cm depth in agropastoral farming system, Alegrete – RS (ICL4, -29.7788889 -55.36444444, 170 masl); 16 January 2021; M.L.C. Bartz, S.M.G. Gillanders, A.A. Cuesta Hermira, A. de Miranda, D.M. Marques, L. Hammes Dadalt, colls. BRRS0272 (3 individuals), in soil 0-20 cm depth in native grass pasture, Alegrete/RS (NGP4, -29.7777778 -55.36305556, 205 masl); 16 January 2021; M.L.C. Bartz, S.M.G. Gillanders, A.A. Cuesta Hermira, A. de Miranda, D.M. Marques, L. Hammes Dadalt, colls.Published as part of Gillanders, Stephen M. G., Podgaiski, Luciana R., Overbeck, Gerhard E., Santos, Alessandra, Winck, Bruna, Brown, George G. & Bartz, Marie L. C., 2023, Earthworms in natural grasslands and agropastoral systems in the Brazilian Pampa, pp. 377-388 in Zootaxa 5255 (1) on page 379, DOI: 10.11646/zootaxa.5255.1.30, http://zenodo.org/record/774505
Metaphire californica
No full text<i>Metaphire californica</i> (Kinberg) <p>BRRS0276 (9 individuals) in soil 0-20 cm depth in a garden lawn of the main house of the Estância e Cabanha Cinco Salsos, Aceguá/RS (-31,643100 -54,193178, 176 masl); 14 January 2021, M.Bartz, coll.</p>Published as part of <i>Gillanders, Stephen M. G., Podgaiski, Luciana R., Overbeck, Gerhard E., Santos, Alessandra, Winck, Bruna, Brown, George G. & Bartz, Marie L. C., 2023, Earthworms in natural grasslands and agropastoral systems in the Brazilian Pampa, pp. 377-388 in Zootaxa 5255 (1)</i> on page 381, DOI: 10.11646/zootaxa.5255.1.30, <a href="http://zenodo.org/record/7745051">http://zenodo.org/record/7745051</a>
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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