Perspectives of Tribal Communities on NTFP Resource Use in a Global Hotspot: Implications for Adaptive Management

Tribal communities depend on a large variety of Non-timber forest products (NTFPs) for their diverse needs, which has attracted high interest in recent years in view of increasing rural incomes and stimulating the forest management. This study investigates forest dependent (NTFPs based) livelihood in an ethnically diverse area in Northeast India, a global hotspot. We addressed two research questions: (1) what is the diversity of NTFPs resources that communities extract from the forest reserves to supplement their home needs? and (2) what are the perceptions of communities about sustainable development of NTFPs resources? We recorded 343 plant species that were used to fulfill varied needs of five tribal communities. Of them, 32% species harvested for their leaves and 27% for fruits. Dependence on NTFPs was more at high mountains. The seasonal use of NTFPs revealed that 79% species collected during lean period. Community perception on use of NTFPs revealed that 11% species consumed most frequently and 53% commonly. It was interesting to note that community residents sell as many as 76 species in the local markets to earn cash. All households collect NTFPs for sustenance while 31-41% households involved in commercial collection of species, viz. Taxus wallichiana, Aconitum fletcherianum, Ophiocordyceps sinensis, Swertia chirayita, Illicium griffithii, and Thalictrum foliolosum. There was a gradual decrease in use of NTFPs with young age because of high labour and availability of other options. The communities perceived that unscientific and excessive harvesting may threatened these species in near future. For adaptive management of NTFPs, communities suggested that capacity building on maximum allowable harvests and yield regulation measures, tenure improvement, domestication and plantations of selected species along with access to markets for NTFPs products will create better economic gains for communities at the same time it will lead to sustainable management of NTFPs.   Keywords: Northeast India; global hotspot; NTFPs; sustainable use; consumption pattern; enterprises; livelihoods; adaptive managemen

Perspectives of Tribal Communities on NTFP Resource Use in a Global Hotspot: Implications for Adaptive Management

Tribal communities depend on a large variety of Non-timber forest products (NTFPs) for their diverse needs, which has attracted high interest in recent years in view of increasing rural incomes and stimulating the forest management. This study investigates forest dependent (NTFPs based) livelihood in an ethnically diverse area in Northeast India, a global hotspot. We addressed two research questions: (1) what is the diversity of NTFPs resources that communities extract from the forest reserves to supplement their home needs? and (2) what are the perceptions of communities about sustainable development of NTFPs resources? We recorded 343 plant species that were used to fulfill varied needs of five tribal communities. Of them, 32% species harvested for their leaves and 27% for fruits. Dependence on NTFPs was more at high mountains. The seasonal use of NTFPs revealed that 79% species collected during lean period. Community perception on use of NTFPs revealed that 11% species consumed most frequently and 53% commonly. It was interesting to note that community residents sell as many as 76 species in the local markets to earn cash. All households collect NTFPs for sustenance while 31-41% households involved in commercial collection of species, viz. Taxus wallichiana, Aconitum fletcherianum, Ophiocordyceps sinensis, Swertia chirayita, Illicium griffithii, and Thalictrum foliolosum. There was a gradual decrease in use of NTFPs with young age because of high labour and availability of other options. The communities perceived that unscientific and excessive harvesting may threatened these species in near future. For adaptive management of NTFPs, communities suggested that capacity building on maximum allowable harvests and yield regulation measures, tenure improvement, domestication and plantations of selected species along with access to markets for NTFPs products will create better economic gains for communities at the same time it will lead to sustainable management of NTFPs.   Keywords: Northeast India; global hotspot; NTFPs; sustainable use; consumption pattern; enterprises; livelihoods; adaptive managemen

Nonlinear Spinor Fields and its role in Cosmology

Different characteristic of matter influencing the evolution of the Universe has been simulated by means of a nonlinear spinor field. Exploiting the spinor description of perfect fluid and dark energy evolution of the Universe given by an anisotropic Bianchi type-VI, VI$_0$, V, III, I or isotropic Friedmann-Robertson-Walker (FRW) one has been studied. It is shown that due to some restrictions on metric functions, initial anisotropy in the models Bianchi type-VI, VI$_0$, V and III does not die away, while the anisotropic Bianchi type-I models evolves into the isotropic one.Comment: 22 pages, 12 Figure

Scalar field in cosmology: Potential for isotropization and inflation

The important role of scalar field in cosmology was noticed by a number of authors. Due to the fact that the scalar field possesses zero spin, it was basically considered in isotropic cosmological models. If considered in an anisotropic model, the linear scalar field does not lead to isotropization of expansion process. One needs to introduce scalar field with nonlinear potential for the isotropization process to take place. In this paper the general form of scalar field potentials leading to the asymptotic isotropization in case of Bianchi type-I cosmological model, and inflationary regime in case of isotropic space-time is obtained. In doing so we solved both direct and inverse problem, where by direct problem we mean to find metric functions and scalar field for the given potential, whereas, the inverse problem means to find the potential and scalar field for the given metric function. The scalar field potentials leading to the inflation and isotropization were found both for harmonic and proper synchronic time.Comment: 10 page

Spinor model of a perfect fluid and their applications in Bianchi type-I and FRW models

Different characteristic of matter influencing the evolution of the Universe has been simulated by means of a nonlinear spinor field. Exploiting the spinor description of perfect fluid and dark energy evolution of the Universe given by an anisotropic Bianchi type-I (BI) or isotropic Friedmann-Robertson-Walker (FRW) one has been studied.Comment: 10 pages, 8 Figure

Ultra Long Period Cepheids: a primary standard candle out to the Hubble flow

The cosmological distance ladder crucially depends on classical Cepheids (with P=3-80 days), which are primary distance indicators up to 33 Mpc. Within this volume, very few SNe Ia have been calibrated through classical Cepheids, with uncertainty related to the non-linearity and the metallicity dependence of their period-luminosity (PL) relation. Although a general consensus on these effects is still not achieved, classical Cepheids remain the most used primary distance indicators. A possible extension of these standard candles to further distances would be important. In this context, a very promising new tool is represented by the ultra-long period (ULP) Cepheids (P \geq 80 days), recently identified in star-forming galaxies. Only a small number of ULP Cepheids have been discovered so far. Here we present and analyse the properties of an updated sample of 37 ULP Cepheids observed in galaxies within a very large metallicity range of 12+log(O/H) from ~7.2 to 9.2 dex. We find that their location in the colour(V-I)-magnitude diagram as well as their Wesenheit (V-I) index-period (WP) relation suggests that they are the counterparts at high luminosity of the shorter-period (P \leq 80 days) classical Cepheids. However, a complete pulsation and evolutionary theoretical scenario is needed to properly interpret the true nature of these objects. We do not confirm the flattening in the studied WP relation suggested by Bird et al. (2009). Using the whole sample, we find that ULP Cepheids lie around a relation similar to that of the LMC, although with a large spread (~0.4 mag).Comment: 8 pages, 4 figures, accepted for publication in Astrophysics & Space Scienc

Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set

We report a measurement of the bottom-strange meson mixing phase \beta_s using the time evolution of B0_s -> J/\psi (->\mu+\mu-) \phi (-> K+ K-) decays in which the quark-flavor content of the bottom-strange meson is identified at production. This measurement uses the full data set of proton-antiproton collisions at sqrt(s)= 1.96 TeV collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9.6 fb-1 of integrated luminosity. We report confidence regions in the two-dimensional space of \beta_s and the B0_s decay-width difference \Delta\Gamma_s, and measure \beta_s in [-\pi/2, -1.51] U [-0.06, 0.30] U [1.26, \pi/2] at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of \beta_s, we also determine \Delta\Gamma_s = 0.068 +- 0.026 (stat) +- 0.009 (syst) ps-1 and the mean B0_s lifetime, \tau_s = 1.528 +- 0.019 (stat) +- 0.009 (syst) ps, which are consistent and competitive with determinations by other experiments.Comment: 8 pages, 2 figures, Phys. Rev. Lett 109, 171802 (2012