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Artikel: Changes in structure and composition of evergreen forests on an altitudinal gradient in the Venezuelan Guayana shield.

Hernández, Lionel / Dezzeo, Nelda / Sanoja, Elio / Salazar, Leandro / Castellanos, Hernán

2012 Band 60, Heft 1, Seite(n) 11–33

Abstract: There have been several ecological studies in forests of the Guayana Shield, but so far none had examined the changes in structure and composition of evergreen forests with altitude. This study describes and analyzes the structure, species composition ... ...

Abstract	There have been several ecological studies in forests of the Guayana Shield, but so far none had examined the changes in structure and composition of evergreen forests with altitude. This study describes and analyzes the structure, species composition and soil characteristics of forest stands at different altitudinal zones in Southeastern Venezuelan Guayana, in order to explain the patterns and the main factors that determine the structure and composition of evergreen forests along the altitudinal gradient. Inventories of 3 948 big (>10cm DBH) and 1 328 small (5-10cm DBH) woody stems were carried out in eleven plots, ranging from 0.1 to 1.0ha, along a 188km long transect with elevations between 290 and 1 395masl. It has been found that 1) hemiepihytes become more dominant and lianas reduce their dominance with increasing altitude and 2) the forest structure in the study area is size-dependent. Five families and 12 genera represented only 9% of the total number of families and genera, respectively, recorded troughout the gradient, but the two groups of taxa comprised more than 50% of the Importance Value (the sum of the relative density and the relative dominance) of all measured stems. Moreover, the results suggest that low species richness seems to be associated with the dominance of one or few species. Stand-level wood density (WD) of trees decreased significantly with increasing elevation. WD is an indicator of trees'life history strategy. Its decline suggests a change in the functional composition of the forest with increasing altitude. The Canonical Correspondence Analysis (CCA) indicated a distinction of the studied forests on the basis of their altitudinal levels and geographic location, and revealed different ecological responses by the forests, to environmental variables along the altitudinal gradient. The variation in species composition, in terms of basal area among stands, was controlled primarily by elevation and secondarily by rainfall and soil conditions. There are other interacting factors not considered in this study like disturbance regime, biological interactions, productivity, and dispersal history, which could affect the structure and composition of the forests in the altitudinal gradient. In conclusion, it appears that the structural and floristic variability observed in the studied transect is produced by a combination of different climates and randomly expressed local processes interacting across a complex physical landscape.
Mesh-Begriff(e)	Altitude ; Biodiversity ; Biomass ; Soil/analysis ; Trees/anatomy & histology ; Trees/classification ; Venezuela
Chemische Substanzen	Soil
Sprache	Englisch
Erscheinungsdatum	2012-03-27
Erscheinungsland	Costa Rica
Dokumenttyp	Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2020929-0
ISSN	2215-2075 ; 0034-7744
ISSN (online)	2215-2075
ISSN	0034-7744
DOI	10.15517/rbt.v60i1.2360
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel: Changes in soil properties and vegetation characteristics along a forest-savanna gradient in southern Venezuela

Dezzeo, N / Chacon, N / Sanoja, E / Picon, G

Forest ecology and management. 2004 Oct. 25, v. 200, issue 1-3

2004

Schlagwörter	forests ; savannas ; ecotones ; vegetation ; botanical composition ; forest soils ; savanna soils ; soil depth ; soil texture ; soil chemistry ; soil organic matter ; forest litter ; forest fires ; charcoal ; forest succession ; Venezuela
Sprache	Englisch
Erscheinungsverlauf	2004-1025
Umfang	p. 183-193.
Dokumenttyp	Artikel
ZDB-ID	751138-3
ISSN	0378-1127
ISSN	0378-1127
Datenquelle	NAL Katalog (AGRICOLA)

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Artikel ; Online: Taking the pulse of Earth's tropical forests using networks of highly distributed plots

ForestPlots.net / Blundo Canto, Genowefa M. / Carilla, J. / Grau, R. / Malizia, A. / Malizia, L. / Osinaga-Acosta, O. / Bird, M. / Bradford, M. / Catchpole, D. / Ford, A. / Graham, A. / Hilbert, D. / Kemp, J. / Laurance, S.G.W. / Laurance, W. / Ishida, F.Y. / Marshall, A. / Waite, C. /

Woell, H. / Bastin, J.F. / Bauters, M. / Beeckman, H. / Boeckx, P. / Bogaert, J. / Cannière, C. de / Haulleville, T. de / Doucet, J.-L. / Hardy, O. / Hubau, W. / Kearsley, E. / Verbeeck, H. / Vleminckx, J. / Brewer, S.W. / Alarcón, A. / Araujo-Murakami, A. / Arets, E. / Arroyo, L. / Chavez, E. / Fredericksen, T. / Villaroel, R.G. / Sibauty, G.G. / Killeen, T. / Licona, J.C. / Lleigue, J. / Mendoza, C. / Murakami, S. / Gutiérrez, A.P. / Pardo, G. / Peña-Claros, M. / Poorter, L. / Toledo, M. / Cayo, J.V. / Viscarra, L.J. / Vos, V. / Ahumada, J. / Almeida, E. / Almeida, J. / Oliveira, E.A. de / Cruz, W.A. da / Oliveira, A.A. de / Carvalho, F.A. / Obermuller, F.A. / Andrade, A. / Vieira, S.A. / Aquino, A.C. / Aragão, L. / Araújo, A.C. / Assis, M.A. / Gomes, J.A.M.A. / Baccaro, F. / Camargo, P.B. de / Barni, P. / Barroso, J. / Bernacci, L.C. / Bordin, K. / Medeiros, M.B. de / Broggio, I. / Camargo, J.L. / Cardoso, D. / Carniello, M.A. / Rochelle, A.L.C. / Castilho, C. / Castro, A.A.J.F. / Castro, W. / Ribeiro, S.C. / Costa, F. / Oliveira, R.C. de / Coutinho, I. / Cunha, J. / Costa, L. da / Costa Ferreira, L. da / Costa Silva, R. da / Graça Zacarias Simbine, M. da / Andrade Kamimura, V. de / Lima, H.C. de / Oliveira Melo, L. de / de Queiroz, L. / Sousa Lima, J.R. de / do Espírito Santo, M. / Domingues, T. / dos Santos Prestes, N.C. / Carneiro, S.E.S. / Elias, F. / Eliseu, G. / Emilio, T. / Farrapo, C.L. / Fernandes, L. / Ferreira, G. / Ferreira, J. / Ferreira, L. / Ferreira, S. / Simon, M.F. / Freitas, M.A. / García, Q.S. / Manzatto, A.G. / Graça, P. / Guilherme, F. / Hase, E. / Higuchi, N. / Iguatemy, M. / Barbosa, R.I. / Jaramillo, M. / Joly, C. / Klipel, J. / do Amaral, I.L. / Levis, C. / Lima, A.S. / Dan, M.L. / Lopes, A. / Madeiros, H. / Magnusson, W.E. / dos Santos, R.M. / Marimon, B. / Junior, B.H.M. / Grillo, R.M.M. / Martinelli, L. / Reis, S.M. / Medeiros, S. / Meira-Junior, M. / Metzker, T. / Morandi, P. / do Nascimento, N.M. / Moura, M. / Müller, S.C. / Nagy, L. / Nascimento, H. / Nascimento, M. / Lima, A.N. / Araújo, R.N.O. de / Silva, J.O. / Pansonato, M. / Sabino, G.P. / Abreu, K.M.P. de / Rodrigues, P.J.F.P. / Piedade, M. / Rodrigues, D. / Rodrigues Pinto, J.R. / Quesada, C. / Ramos, E. / Ramos, R. / Rodrigues, P. / Sousa, T.R. de / Salomão, R. / Santana, F. / Scaranello, M. / Bergamin, R.S. / Schietti, J. / Schöngart, J. / Schwartz, G. / Silva, N. / Silveira, M. / Seixas, C.S. / Simbine, M. / Souza, A.C. / Souza, P. / Souza, R. / Sposito, T. / Junior, E.S. / do Vale, J.D. / Vieira, I.C.G. / Villela, D. / Vital, M. / Xaud, H. / Zanini, K. / Zartman, C.E. / Ideris, N.K.H. / Metali, F.b.H. / Salim, K.A. / Saparudin, M.S. / Serudin, R.M. / Sukri, R.S. / Begne, S. / Chuyong, G. / Djuikouo, M.N. / Gonmadje, C. / Simo-Droissart, M. / Sonké, B. / Taedoumg, H.E. / Zemagho, L. / Thomas, S. / Baya, F. / Saiz, Gustavo / Espejo, J.S. / Chen, D. / Hamilton, A. / Li, Y. / Luo, T. / Niu, S. / Xu, H. / Zhou, Z. / Álvarez-Dávila, E. / Escobar, J.C.A. / Arellano-Peña, H. / Duarte, J.C. / Calderón, J. / Bravo, L.M.C. / Cuadrado, B. / Cuadros, H. / Duque, A. / Duque, L.F. / Espinosa, S.M. / Franke-Ante, R. / García, H. / Gómez, A. / González M., R. / Idárraga-Piedrahíta, Á. / Jiménez, E. / Jurado, R. / Oviedo, W.L. / López Camacho, R. / Cruz, O.A.M. / Polo, I.M. / Paky, E. / Pérez, K. / Pijachi, A. / Pizano, C. / Prieto, A. / Ramos, L. / Correa, Z.R. / Richardson, J. / Rodríguez, E. / Rodríguez M., G.M. / Rudas, A. / Stevenson, P. / Chudomelová, M. / Dancak, M. / Hédl, R. / Lhota, S. / Svatek, M. / Mukinzi, J. / Ewango, C. / Hart, T. / Yakusu, E.K. / Lisingo, J. / Makana, J.-R. / Mbayu, F. / Toirambe, B. / Mukendi, J.T. / Kvist, L. / Nebel, G. / Báez, S. / Céron, C. / Griffith, D.M. / Andino, J.E.G. / Neill, D. / Palacios, W. / Peñuela-Mora, M.C. / Rivas-Torres, G. / Villa, G. / Demissie, S. / Gole, T. / Gonfa, T. / Ruokolainen, K. / Baisie, M. / Bénédet, F. / Betian, W. / Bezard, V. / Bonal, D. / Chave, J. / Droissart, V. / Gourlet-Fleury, S. / Hladik, A. / Labrière, N. / Naisso, P. / Réjou-Méchain, M. / Sist, P. / Blanc, L. / Burban, B. / Derroire, G. / Dourdain, A. / Stahl, C. / Bengone, N.N. / Chezeaux, E. / Ondo, F.E. / Medjibe, V. / Mihindou, V. / White, L. / Culmsee, H. / Rangel, C.D. / Horna, V. / Wittmann, F. / Adu-Bredu, S. / Affum-Baffoe, K. / Foli, E. / Balinga, M. / Roopsind, A. / Singh, J. / Thomas, R. / Zagt, R. / Murthy, I.K. / Kartawinata, K. / Mirmanto, E. / Priyadi, H. / Samsoedin, I. / Sunderland, T. / Yassir, I. / Rovero, F. / Vinceti, B. / Hérault, B. / Aiba, S.-I. / Kitayama, K. / Daniels, A. / Tuagben, D. / Woods, J.T. / Fitriadi, M. / Karolus, A. / Khoon, K.L. / Majalap, N. / Maycock, C. / Nilus, R. / Tan, S. / Sitoe, A. / Coronado G, I. / Ojo, L. / Assis, R. de / Poulsen, A.D. / Sheil, D. / Pezo, K.A. / Verde, H.B. / Moscoso, V.C. / Oroche, J.C.C. / Valverde, F.C. / Medina, M.C. / Cardozo, N.D. / Rutte Corzo, J. de / Águila Pasquel, J. del / Llampazo, G.F. / Freitas, L. / Cabrera, D.G. / Villacorta, R.G. / Cabrera, K.G. / Soria, D.G. / Saboya, L.G. / Ríos, J.M.G. / Pizango, G.H. / Coronado, E.H. / Huamantupa-Chuquimaco, I. / Huasco, W.H. / Aedo, Y.T.H. / Peña, J.L.M. / Mendoza, A.M. / Rodríguez, V.M. / Vargas, P.N. / Ramos, S.C.P. / Camacho, N.P. / Cruz, A.P. / Arevalo, F.R. / Huaymacari, J.R. / Rodríguez, C.R. / Paredes, M.A.R. / Bayona, L.R. / Pilar Rojas Gonzales, R. del / Peña, M.E.R. / Revilla, N.S. / Shareva, Y.C.S. / Trujillo, R.T. / Gamarra, L.V. / Martínez, R.V. / Arenas, J.V. / Amani, C. / Ifo, S.A. / Bocko, Y. / Boundja, P. / Ekoungoulou, R. / Hockemba, M. / Nzala, D. / Fofanah, A. / Taylor, D. / Bañares-de Dios, G. / Cayuela, L. / La Cerda, Í.G.-d. / Macía, M. / Stropp, J. / Playfair, M. / Wortel, V. / Gardner, T. / Muscarella, R. / Rutishauser, E. / Chao, K.-J. / Munishi, P. / Bánki, O. / Bongers, F. / Boot, R. / Fredriksson, G. / Reitsma, J. / Ter Steege, H. / Andel, T. van / Meer, P. van de / Hout, P. van der / Nieuwstadt, M. van / Ulft, B. van / Veenendaal, E. / Vernimmen, R. / Zuidema, P. / Zwerts, J. / Akite, P. / Bitariho, R. / Chapman, C. / Gerald, E. / Leal, M.E. / Mucunguzi, P. / Abernethy, K. / Alexiades, M. / Baker, T.R. / Banda, K. / Banin, L. / Barlow, J. / Bennett, A. / Berenguer, E. / Berry, N. / Bird, N.M. / Blackburn, G.A. / Brearley, F. / Brienen, R. / Burslem, D. / Carvalho, L. / Cho, P. / Coelho, F. / Collins, M. / Coomes, D. / Cuní-Sanchez, A. / Dargie, G. / Dexter, K. / Disney, M. / Draper, F. / Duan, M. / Esquivel-Muelbert, A. / Ewers, R. / Fadrique, B. / Fauset, S. / Feldpausch, T.R. / França, F. / Galbraith, D. / Gilpin, M. / Gloor, E. / Grace, J. / Hamer, K. / Harris, D. / Jeffery, K. / Jucker, T. / Kalamandeen, M. / Klitgaard, B. / Levesley, A. / Lewis, S.L. / Lindsell, J. / López Gonzalez, G. / Lovett, J. / Malhi, Y. / Marthews, T. / McIntosh, E. / Melgaço, K. / Milliken, W. / Mitchard, E. / Moonlight, P. / Moore, S. / Morel, A. / Peacock, J. / Peh, K.S.H. / Pendry, C. / Pennington, R.T. / Oliveira Pereira, L. de / Peres, C. / Phillips, O.L. / Pickavance, G. / Pugh, T. / Qie, L. / Riutta, T. / Roucoux, K. / Ryan, C. / Sarkinen, T. / Valeria, C.S. / Spracklen, D. / Stas, S. / Sullivan, M. / Swaine, M. / Talbot, J. / Taplin, J. / Heijden, G. van der / Vedovato, L. / Willcock, S. / Williams, M. / Alves, L. / Loayza, P.A. / Arellano, G. / Asa, C. / Ashton, P. / Asner, G. / Brncic, T. / Brown, F. / Burnham, R. / Clark, C. / Comiskey, J. / Damasco, G. / Davies, S. / Di Fiore, T. / Erwin, T. / Farfan-Rios, W. / Hall, J. / Kenfack, D. / Lovejoy, Thomas E. / Martin, R. / Montiel, O.M. / Pipoly, J. / Pitman, N. / Poulsen, J. / Primack, R. / Silman, M. / Steininger, M. / Swamy, V. / Terborgh, J. / Thomas, D. / Umunay, P.M. / Uriarte, M. / Torre, E.V. / Wang, O. / Young, K. / Aymard C, G.A. / Hernández, L. / Fernández, R.H. / Ramírez-Angulo, H. / Salcedo, P. / Sanoja, E. / Serrano, J. / Torres Lezama, A. / Le, T.C. / Le, T.T. / Tran, H.D.

Biological Conservation

2021

Abstract: Tropical forests are the most diverse and productive ecosystems on Earth. While better understanding of these forests is critical for our collective future, until quite recently efforts to measure and monitor them have been largely disconnected. ... ...

Abstract	Tropical forests are the most diverse and productive ecosystems on Earth. While better understanding of these forests is critical for our collective future, until quite recently efforts to measure and monitor them have been largely disconnected. Networking is essential to discover the answers to questions that transcend borders and the horizons of funding agencies. Here we show how a global community is responding to the challenges of tropical ecosystem research with diverse teams measuring forests tree-by-tree in thousands of long-term plots. We review the major scientific discoveries of this work and show how this process is changing tropical forest science. Our core approach involves linking long-term grassroots initiatives with standardized protocols and data management to generate robust scaled-up results. By connecting tropical researchers and elevating their status, our Social Research Network model recognises the key role of the data originator in scientific discovery. Conceived in 1999 with RAINFOR (South America), our permanent plot networks have been adapted to Africa (AfriTRON) and Southeast Asia (T-FORCES) and widely emulated worldwide. Now these multiple initiatives are integrated via ForestPlots.net cyber-infrastructure, linking colleagues from 54 countries across 24 plot networks. Collectively these are transforming understanding of tropical forests and their biospheric role. Together we have discovered how, where and why forest carbon and biodiversity are responding to climate change, and how they feedback on it. This long-term pan-tropical collaboration has revealed a large long-term carbon sink and its trends, as well as making clear which drivers are most important, which forest processes are affected, where they are changing, what the lags are, and the likely future responses of tropical forests as the climate continues to change. By leveraging a remarkably old technology, plot networks are sparking a very modern revolution in tropical forest science. In the future, humanity can benefit ...
Schlagwörter	biodiversity conservation
Sprache	Englisch
Erscheinungsdatum	2021-06-22T03:05:09Z
Verlag	Elsevier
Erscheinungsland	fr
Dokumenttyp	Artikel ; Online
Datenquelle	BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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Artikel: New Species of Ormosia (Leguminosae: Papilionoideae, Sophoreae) from the Guayana Shield, Bolivar State, Venezuela

Aymard C., Gerardo A. / Sanoja, Elio

Harvard papers in botany

Band v. 17,, Heft no. 2

Abstract: Ormosia mataridek (Leguminosae, Papilionoideae, Sophoreae s.l., Genistoid clade) from Sierra de Lema, Bolivar state, Venezuela, is described, illustrated, and its relationships with allied species in Ormosia section Ormosia are discussed. The new species ...

Abstract	Ormosia mataridek (Leguminosae, Papilionoideae, Sophoreae s.l., Genistoid clade) from Sierra de Lema, Bolivar state, Venezuela, is described, illustrated, and its relationships with allied species in Ormosia section Ormosia are discussed. The new species is similar to the Amazonian and Guayana Shield close species O. bolivarensis and O. nobilis; however, it differs in its smaller leaflets, flowers and fruit, calyx lobes 1.5–3 mm long, the standard 8–9 mm long, and the 1–2-seeded, entire, suborbicular to ovate fruit.
Schlagwörter	new species ; Ormosia ; Lema ; calyx
Sprache	Englisch
Dokumenttyp	Artikel
ISSN	1043-4534
Datenquelle	AGRIS - International Information System for the Agricultural Sciences and Technology

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Artikel: Changes in structure and composition of evergreen forests on an altitudinal gradient in the Venezuelan Guayana shield.

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Artikel: Changes in soil properties and vegetation characteristics along a forest-savanna gradient in southern Venezuela

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Artikel ; Online: Taking the pulse of Earth's tropical forests using networks of highly distributed plots

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Artikel: New Species of Ormosia (Leguminosae: Papilionoideae, Sophoreae) from the Guayana Shield, Bolivar State, Venezuela

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