Neves A.C.,Federal University of Minas Gerais |
Nogueira F.B.,Federal University of Minas Gerais |
de Assis L.R.,Federal University of Minas Gerais |
Paglia A.P.,Federal University of Minas Gerais |
And 2 more authors.
Plant Ecology | Year: 2014
Pseudoviviparous species are considered to rely almost entirely on vegetative propagation, because flowers are replaced by sprouts, and seedling recruitment is rare. We compared reproductive allocation (inflorescence and seed production) in three propagation modes presented by sympatric species of Leiothrix (Eriocaulaceae): rhizomatous and seminiferous (RS-L. crassifolia); rhizomatous, seminiferous, and pseudoviviparous (RSP-L. spiralis); and seminiferous and pseudoviviparous, in which seed production is considered rare due to reduced inflorescence size and small number of pistillate flowers (SP-L. arrecta and L. propinqua). We hypothesize that such propagation modes constitute a continuum of reproductive investment, that is: RS > RSP > SP. We harvested 154 Leiothrix spp. individuals at the Serra do Cipó, SE Brazil, from which we recorded the number of capitula and seeds, mean seed weight, and dry biomass allocated to plant structures. We then compared distinct propagation modes in relation to reproductive allocation, inflorescence-based and seed-based reproductive effort, and biomass partitioning. Contrary to expectations, the reproductive investment hierarchy found was SP ≥ RS > RSP. Our results do not fully concur with the current view that pseudoviviparous plants allocate few resources to reproduction. We suggest that the larger reproductive investment observed in SP helps to wait for better recruitment conditions in crowded and highly competitive mature populations (temporal escape), and to cope with destructive disturbances such as fire, since SP species lacks rhizomes. © 2014 Springer Science+Business Media Dordrecht. Source
Machado A.B.M.,Federal University of Minas Gerais |
Bede L.C.,Instituto Terra Brasilis
International Journal of Odonatology | Year: 2015
Two new genera, Franciscobasis and Franciscagrion, and seven new species, i.e. Acanthagrion franciscoi, Franciscobasis franciscoi, Franciscobasis sonia, Franciscagrion franciscoi, Franciscagrion longispinum, Minagrion franciscoi and Oxyagrion franciscoi, are described and illustrated. In addition, two new species of Peristicta are reported and will be described elsewhere. All these species have been collected along a 600 m stretch of the headwaters of the São Francisco River, within the Serra da Canastra National Park, in the state of Minas Gerais, Brazil. The significance of this finding in such a small area is discussed. http://zoobank.org/urn:lsid:zoobank.org:act:B7390427-0D9D-4464-AA67-5664B0688DA5; http://zoobank.org/urn:lsid:zoobank.org:act:48F0C894-1847-4594-A5EF-B71A0F57583D; http://zoobank.org/urn:lsid:zoobank.org:act:E4D73BF2-2E2A-4D55-9252-931CABBC2A0B; http://zoobank.org/urn:lsid:zoobank.org:act:D844B3F6-0D38-4C3E-B842-FD1A83073F9F; http://zoobank.org/urn:lsid:zoobank.org:act:29D2C471-8882-4C36-9764-84C7EBA893C6; http://zoobank.org/urn:lsid:zoobank.org:act:DDAF4E8C-69DD-41C2-AEFA-EC42186F6E5E; http://zoobank.org/urn:lsid:zoobank.org:act:725CC35B-749F-498D-B3F0-1D29193E1538; http://zoobank.org/urn:lsid:zoobank.org:act:6BCC759F-83DA-43ED-A700-B28CE3CA24BB; http://zoobank.org/urn:lsid:zoobank.org:act:3CC24F54-773D-4B0B-9C70-DE32F351D4BD © 2016 Taylor & Francis. Source
Bede L.C.,Instituto Terra Brasilis |
Marini-Filho O.J.,Cecat Instituto Chico Mendes Of Conservacao Da Biodiversidade |
Neto F.C.C.,Rua Joao Afonso Moreira |
Ribeiro F.,Instituto Terra Brasilis |
And 3 more authors.
Check List | Year: 2015
We herein report new records of Parides burchellanus (Westwood, 1872) in southwestern Minas Gerais state, Brazil, in areas of the upper São Francisco and Araguari river systems, including the buffer zone of the Parque Nacional da Serra da Canastra. Until recently, the only known colonies of P. burchellanus were located in the municipalities of Brumadinho, in Minas Gerais state, and Planaltina, in the Distrito Federal, some 640 km apart from each other. The implications of these new records to the conservation status of this species are discussed. © 2015 Check List and Authors. Source
Schroth G.,C.P. 513 |
Bede L.C.,Instituto Terra Brasilis |
Paiva A.O.,WWF Brazil |
Cassano C.R.,State University of Santa Cruz |
And 7 more authors.
Mitigation and Adaptation Strategies for Global Change | Year: 2015
While many studies have measured the carbon (C) stocks of traditional agroforests at the plot level, their contribution to overall landscape C storage has rarely been quantified. Here we demonstrate the significant contribution that traditional agroforests with shaded tree crops can make to landscape C storage, and thus climate change mitigation, focusing on the cocoa (Theobroma cacao) agroforests (locally known as cabrucas) of southern Bahia, Brazil. Using published allometric relationships and tree inventories of 55 shaded cocoa farms, 6 mature forests, 8 disturbed forests and 7 fallows, we calculate average aboveground C stocks of 87 and 46 Mg ha−1 in traditional and intensified cocoa agroforests, respectively, 183 Mg ha−1 in old-growth forests, 102 Mg ha−1 in disturbed forests and 33 Mg ha−1 in fallows. Based on the most recent land cover data available, we estimate that cocoa agroforests hold 59 % of the total aboveground C stocks of the tree dominated vegetation in this landscape, while forests hold 32 % and fallows hold 9 %. Carbon stocks of intensified cocoa agroforestry systems were only little over one-half of those of traditional agroforests, indicating a threat to landscape C stocks from current land use trends. We show that in agroforests as in natural forests, C stocks are highly concentrated in the largest trees. This suggests that the intensification of traditional agroforests, which generally involves increasing the density of cocoa and other tree crops and reducing the density of shade trees, is possible without greatly affecting their C storage if large trees are conserved. In order to conserve the climate stabilizing effect of traditional agroforests and steer necessary intensification measures towards climate-friendly solutions, we suggest that biodiversity and C-rich traditional agroforests should be included in current discussions about Reducing Emissions from Deforestation and Forest Degradation (REDD+) and/or their owners be rewarded for their environmental services through other incentive mechanisms. © 2013, Springer Science+Business Media Dordrecht. Source
Vilaca S.T.,Federal University of Minas Gerais |
Vilaca S.T.,University of Ferrara |
Redondo R.A.F.,Federal University of Minas Gerais |
Redondo R.A.F.,Institute of Science and Technology |
And 2 more authors.
Conservation Genetics | Year: 2012
The Brazilian Merganser is a very rare and threatened species that nowadays inhabits only a few protected areas and their surroundings in the Brazilian territory. In order to estimate the remaining genetic diversity and population structure in this species, two mitochondrial genes were sequenced in 39 individuals belonging to two populations and in one individual collected in Argentina in 1950. We found a highly significant divergence between two major remaining populations of Mergus octosetaceus, which suggests a historical population structure in this species. Furthermore, two deeply divergent lineages were found in a single location, which could due to current or historical secondary contact. Based on the available genetic data, we point out future directions which would contribute to design strategies for conservation and management of this threatened species. © 2011 Springer Science+Business Media B.V. Source