1,720,983 research outputs found
Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna
No full textFreire, Rodrigo M., Montero, Guillermo A., Vesprini, José L., Barberis, Ignacio M. (2021): Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna. Journal of Natural History 55 (5-6): 283-303, DOI: 10.1080/00222933.2021.1902010, URL: http://dx.doi.org/10.1080/00222933.2021.190201
Figure 1 in Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna
No full textFigure 1. Aechmea distichantha has (a) terrestrial and (b) epiphytic habits. (c) Its leaf axils are inhabited by vertebrates. (d) Pollinators visit their inflorescences and (e) some animal species construct their nests and lay their eggs protected beneath the spiny leaves in the inter-ramet space.Published as part of Freire, Rodrigo M., Montero, Guillermo A., Vesprini, José L. & Barberis, Ignacio M., 2021, Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna, pp. 283-303 in Journal of Natural History 55 (5-6) on page 286, DOI: 10.1080/00222933.2021.1902010, http://zenodo.org/record/547388
Figure 2 in Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna
No full textFigure 2. Evolution of the number of publications from the 1960s to the present grouped in 10-year periods about interactions of Aechmea distichantha with animals in the mid-latitudes of South America.Published as part of Freire, Rodrigo M., Montero, Guillermo A., Vesprini, José L. & Barberis, Ignacio M., 2021, Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna, pp. 283-303 in Journal of Natural History 55 (5-6) on page 289, DOI: 10.1080/00222933.2021.1902010, http://zenodo.org/record/547388
Figure 3 in Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna
No full textFigure 3. (a) Number of animal species associated with, and (b) number of interactions established with A. distichantha. In both graphs, the records are ordered taxonomically according to Hyman (1940).Published as part of Freire, Rodrigo M., Montero, Guillermo A., Vesprini, José L. & Barberis, Ignacio M., 2021, Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna, pp. 283-303 in Journal of Natural History 55 (5-6) on page 290, DOI: 10.1080/00222933.2021.1902010, http://zenodo.org/record/547388
Figure 1 in Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna
No full textFigure 1. Aechmea distichantha has (a) terrestrial and (b) epiphytic habits. (c) Its leaf axils are inhabited by vertebrates. (d) Pollinators visit their inflorescences and (e) some animal species construct their nests and lay their eggs protected beneath the spiny leaves in the inter-ramet space.Published as part of Freire, Rodrigo M., Montero, Guillermo A., Vesprini, José L. & Barberis, Ignacio M., 2021, Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna, pp. 283-303 in Journal of Natural History 55 (5-6) on page 286, DOI: 10.1080/00222933.2021.1902010, http://zenodo.org/record/547388
Figure 4 in Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna
No full textFigure 4. Bipartite nets showing the relative proportion of interactions of Aechmea distichantha with animals registered for the different taxonomic groups classified according to the (a) use of the plant, (b) trophic level and (c) type (resource involved) of herbivory and ordered following the 'as few crossings of interactions as possible' criteria. Boxes represent the number of morphospecies, and categories and paths represent the number of interactions.Published as part of Freire, Rodrigo M., Montero, Guillermo A., Vesprini, José L. & Barberis, Ignacio M., 2021, Review of the interactions of an ecological keystone species, Aechmea distichantha Lem. (Bromeliaceae), with the associated fauna, pp. 283-303 in Journal of Natural History 55 (5-6) on page 291, DOI: 10.1080/00222933.2021.1902010, http://zenodo.org/record/547388
Relationship between degradation and the structural-functional complexity of subtropical xerophytic forests in the Argentine Wet Chaco
No full textGlobally, forests are severely compromised by land use change and anthropogenic degradation. Forests’ struc tural and biotic homogenization leads to the loss of ecosystem processes that sustain their functionality and determine their contributions to people. Resilience is a key property that expresses the capacity of an ecosystem to tolerate, recover, and/or adapt to disturbances without drastically changing its structure or ecological func tions. Once this capacity is exceeded beyond the threshold limit, resilience is lost, and degradation occurs. The Structural – Functional of State and Transition Models (SFSTM) provide a conceptual framework to address ecosystem resilience and the identification of degradation thresholds. In this work, we sought to describe and quantify structural degradation and its relationship between vegetation structural complexity, proxies of ecological processes, and species composition of the quebrachales, a threatened xerophytic subtropical forest of great environmental and socio-economic value in the Wet Chaco of Argentina. For this purpose, a set of forest sites were selected to represent the different histories of uses, where vegetation and soil samplings were carried out. A Structural Degradation Index (SDI) was constructed based on a set of structural variables using multi variate techniques, and the sites were ordered and classified into two structural groups. Linear (generalized) and
segmented models were performed to analyze the responses of vegetation heterogeneity and proxies of ecosystem process to structural degradation and to identify thresholds. In addition, species composition was analyzed based on comparing the coefficients of beta diversity, nestedness, and concordance between sites. The structural degradation of the quebracho forest was negatively related to vegetation complexity and ecological processes, and there were breakpoints or non-linear responses between structural groups. Biological diversity was nega tively related to anthropogenic degradation due to an increase in beta diversity between structural groups, as well as a process of species divergence between degraded sites. This work shows a clear approach to studying the resilience of subtropical xerophytic forests with concrete results on structural homogenization, loss or decrease of ecological processes, and biotic simplification due to anthropogenic degradation of these ecosystems. In the context of global climate change and rapid human-induced alterations, addressing forest ecosystem resilience from a structural and functional perspective could be a novel approach to its medium- and long-term management.EEA ManfrediFil: Alvarez Arnesi, Eugenio. Universidad Nacional de Rosario. Instituto de Investigaciones en Ciencias Agrarias de Rosario; ArgentinaFil: Alvarez Arnesi, Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones en Ciencias Agrarias de Rosario; Argentina.Fil: López, Dardo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi. Agencia de Extensión Rural Villa Dolores; ArgentinaFil: Barberis, Ignacio M. Universidad Nacional de Rosario. Instituto de Investigaciones en Ciencias Agrarias de Rosario; ArgentinaFil: Barberis, Ignacio M. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe. Instituto de Investigaciones en Ciencias Agrarias de Rosario; Argentina
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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