Assessment of the Impacts of Livestock Grazing on Endangered Red Panda ( Ailurus fulgens ) Habitat in Eastern Nepal

Disturbances caused by livestock grazing are considered as a key attributable factor for the habitat loss of red panda. The present study was carried out in Eastern Nepal mainly focusing on the habitat preferences of red panda and impacts of livestock grazing on it. In total, 15 linear transects were delineated at an elevation interval of 100 m assessing indirect signs of red panda and livestock. Habitat preferences of red panda, vegetation abundance, coverage percentage of vegetation layers (canopy and shrub layer) and distance to water source were recorded using randomly plotted 58 quadrats of 10 m × 10 m. Questionnaire survey and Key Informant Interviews were carried out to evaluate the perception of local community on conservation threats and importance of red panda conservation. Jaccard’s similarity index was used to determine the spatial habitat overlap of livestock and red panda. Litsea elongata, Lithocarpus pachyphylla and Rhododendron falconeri were the most com-mon species in the study area. Grazing signs were observed from 51% of red panda habitats in the study area. Livestock herding has induced negative impacts on the habitat of red panda inside the community forests. The study findings will extend the existing body of knowledge regarding the status of red panda in Eastern Himalayas. In addition, this research will help in the formulation of effective legal and strategic framework of sustainable grazing management.


Introduction
Recognizing environmental and anthropogenic factors which affect distribution and survival of species is a key pursuit of ecology [1] [2]. Information related to habitat characteristics and potential threats is very crucial in formulating an effective conservation-dependent species' management strategy [3] [4]. Red panda (Endangered-IUCN Red List, Appendix I-CITES), inhabits eastern Himalayan temperate broadleaf forests with bamboo in the understory within a preferred altitudinal range of 2400 -3900 m [5] [6]. Red panda is a flagship species of the Eastern Himalayan eco-region with its distribution limited in five countries: China, Myanmar, India, Bhutan and Nepal [5] [7]. It prefers forests dominated by Betula utilis, Rhododendron spp, Abies spp and bamboo species in the understory [8]. Glaston et al. [9] have estimated the global population of red panda to be around 10,000 individuals. The report on Population and Habitat Viability Assessment (PHVA) estimated the total population of red panda ranging from 237 to 1061 individuals in Nepal [10]. However, adequate information about the habitat preferences, ecology and conservation threats to red panda is limited [11] [12].
Although red panda is protected by national laws in all the range countries, their numbers in the wild continue to decline due to habitat loss, fragmentation and poaching [13] [14] [15]. Traditional transhumance grazing method is the major cause of habitat loss and fragmentation in Nepal [6]. Livestock grazing causes abrupt diminution of understory/bamboo species [16]. Increase in the livestock grazing activities has negative impacts on the populations of red panda [17] [18]. In central Nepal, grazing has deteriorated red panda habitat and declined its population [6]. Similarly, Sharma et al. [19] recorded the adverse effects of livestock presence in red panda habitat in Western Nepal. However, Bartolome et al. [20] and Barry et al. [21] suggested that regulated livestock grazing can be an alternative conservation tool in managing the grasslands from invasive plant species and minimizing catastrophic wildland fires.
The current study determines the effects of livestock grazing on red panda habitat suitability in Eastern Nepal and provides some robust information on the habitat preferences of this species. The study aims to offer a scientific basis to promote the endorsement of effective conservation strategies necessary for prolonged conservation of such endangered species.

Study Area
This study was conducted in two community forests of Eastern Nepal: Singhadevi Community forest and Chipchipe Community forest, which lies in the crit-  community forests ranges from 2100 m to 2800 m. The study area has a temperate broad-leaf ecosystem with high dominance of plant species like Rhododendron spp., Lithocarpus pachyphylla, Persea odoratissima, Dryopteris sparsa, and Arundinaria graminifolia [23].
The community forests are surrounded by two rural municipalities. Sherpas, the mountain-dwelling ethnic group are the subsistence farmers who practice conventional and unsustainable farming techniques and depend profoundly on the natural resources.

Materials and Methods
In total, 15 linear transects of an average length of 800 m were delineated in the study area (10 in Chipchipe CF and 5 in Singhadevi CF). Every linear transect was set at an altitudinal interval of approximately 100 m following the methodology provided by [24] and practiced by [8]. The linear transects in Singhadevi CF ranged from 2310 m to 2732 m whereas transects established in Chipchipe CF covered the elevation of 2318 m to 2754 m respectively. While traversing the linear transects, 10 m × 10 m plots were outlined where livestock droppings and the indirect signs especially pellets of red panda were recorded. Besides, two plots were drawn in both initial and finishing points of every linear transect. Altogether, 58 plots were demarcated in the study area. Every plot in the linear transects was categorised according to the indirect signs. The plots containing only red panda evidences were marked as "red panda only plot" whereas plot containing livestock presence signs were noted as "livestock only plot". Addi-Open Journal of Ecology tionally, some plots were distinguished as habitat overlap plots where both red panda and livestock indirect marks were observed [17]. In some unexceptional cases, "non-sign" plots were also delineated predominantly in starting and terminating points of linear transects.
Geographic information such as latitudinal and longitudinal coordinates, elevation and slope was recorded from every plot by using the Global Positioning System (etrex 10). Estimated coverage percentage of different vegetation layers such as shrub layer, canopy and bamboo cover were noted from the surveyed plots. As red panda consume water quickly after eating, distance to nearest water source from the centre of plots was also measured [8] [25].
Altogether, 32 herders were interviewed regarding the socio-economic status, type and number of domesticated animals they rear, their involvement in red panda conservation actions, red panda importance and the possible hazards.
Apart from, Key Informant Interviews (KII) was conducted where 4 forest guardians and 13 executive members of community forest user groups (CFUG) were surveyed to extract in-depth knowledge about the specific issues. Door to door survey was performed to obtain quality data from respondents.
In this study, tree species diversity of respective community forests was calculated by using Shannon-wiener diversity index ( ) where n i indicates the abundance of the i-th species of a given area whereas N resembles total number of species present in the same area [26]. Jaccard's similarity index and Jaccard's distance was employed to measure the extent of resemblance and divergence in the habitats used by red panda and livestock.
Jaccard's similarity coefficient was determined by using the given formula: [28] where, A = number of plots showing red panda presence B = number of plots showing livestock presence C = number of plots showing both the presence of red panda and livestock Likewise, Jaccard's distance was determined by subtracting the Jaccard similarity coefficient by 100% [29].

Habitat Availability and Preferences
In In total, 20 different tree species were recorded from the red panda potential habitat range in Chipchipe CF ( Figure 2) suggesting Persea odoraissima, Lithocarpus pachyphylla, Rhodendrom falconeri, Schefflera impressa and Quercus spp as their favourable plant species.
Likewise, in Singhadevi CF, 11 different tree species were recorded from habitat overlap plots of livestock and red panda. Lithocarpus pachyphylla (24%) had the highest abundance in red panda habitat range followed by Litsea elongata, Schefflera impressa and Rhododendron falconeri ( Figure 3).
In Chipchipe CF, red panda only plot and habitat overlap plot presented a higher diversity index for tree species (Figure 4).    Specifically, in red panda only plot and habitat overlap plot/mutual plot of Chipchipe CF, faecal pellets groups were spotted within 160 m distance from the nearest water source ( Figure 5). Grazing animals were found to prefer distance of <425 m from the water source. Distance to the water source was the highest in non-sign plots i.e. 500 m.
Canopy coverage was found widespread particularly in habitat overlap plots.
Average shrub layer in livestock only plot of Singhadevi CF was higher. Lower abundance of bamboo species was detected from those plots which were shared both by red panda and livestock (  Figure 5. Distance from plot centre to water source in Chipchipe CF. Open Journal of Ecology gives us a basis to interpret red panda distribution and livestock interferences in the study area ( Figure 6). 69.7% of the surveyed plots which show livestock presence substantially overlaps with the potential habitat of red panda.

Conservation Awareness Survey
Livestock herding is a key source of income for these marginal communities.
Approximately 37.5% of the herders rely only on livestock farming for their daily livelihoods whilst remaining 62.5% of their population's subsidiary income source includes agricultural production and business.
The income chart illustrates the gross annual earning of livestock herders.
12.5% of livestock herders earn 20,000 NPR (Nepalese Rupee) per annum whereas 37.5% of herder's income is estimated to range from 20,000 -40,000 NPR per annum (Figure 7). Remaining, 50% of the livestock herders acquire 40,000 -60,000 NPR and above 60,000 NPR by selling livestock commodities.

Discussion
Red panda mostly prefers Persea odoraissima, Lithocarpus pachyphylla, Schefflera impressa, Rhodendrom falconeri, Quercus spp. and Litsea elongata. A corresponding study carried out in Jamuna and Mabu Village Development Committee of Ilam district showed Schefflera impressa as one of the most-favoured tree species by red panda [7]. However, [17] detected contradictory results for a similar type of study where red panda preferred tree species like Betula Utilis and Abies spectabilis and Acer spp. The reason behind disparate findings is that the study area (Dhorpatan Hunting Reserve) lies in Western Nepal, which has comparatively different topographical features and forest ecosystem. The diversity indices for the plots comprising red panda signs varied from 1.54 to 1.60.
The value range shows moderate plant richness in red panda habitat. Kong et al. [30] found similar increment in the vegetation diversity of wild red panda habitat (Shannon Index, H = 1.3 to 2.9).
Bamboo presence in 93% of red panda signs plot portrays about the significance of bamboo as one of the key factors affecting their distribution. Similarly, in Jigme Singye Wangchuk National Park, red panda scats were mostly detected in those areas where bamboo species like Arundinaria racemose and Borindina grossa were abundant [31]. Panthi et al. [32] explored the nutritional composition of red panda pellets and found Arundinaria spp. as frequently consumed plant species. However, in contrast to red panda only plots, bamboo abundance was found to be minimal in habitat overlap plots of both community forests.
This might be due to livestock grazing and the trampling effect that might had caused die-off of bamboo species. Grazing practices decrease bamboo accessibility and prevent it to grow at adequate height requisite for red pandas to forage [6] [33] Red panda presence signs were detected from the sites with denser canopy cover (44% -57%). Williams [7] quantified that red panda prefers forests with Open Journal of Ecology more than 30% of canopy cover. Additionally, red panda might use canopy cover as their defence mechanism to circumvent their predators. However, canopy coverage had less influence on grazing animals. The shrub layer was found comparatively higher in livestock plots of both community forests. The reason behind the larger occupancy of the shrub layer probably signifies the positive response of livestock towards the available shrubs in the surveyed plots. Red panda pellets in the community forests were present at a minimal distance (100 m) from the water sources. Water source accessibility is one of the main factors that determine habitat utilization either by wildlife species or grazing animals [12].  [16]. Also, livestock has been recognized as a potential source for the transmission of zoonotic parasites [8]. Lama et al. [35] found that parasites such as Trichuris spp reported from livestock is the underlying cause of bloody colitis, anaemia and sometimes even death in red pandas. Observed rates of livestock use in the study area clearly portrays about the profound impacts on red panda habitat. Acharya et al. [18] also concluded that the non-protected areas such as community forests showed higher abundance of livestock droppings than protected areas (PA) as there are some restrictions of carrying out grazing within core PAs habitat.
Though, livestock herding is considered as a principal economic occupation of these indigenous people, the total revenue attainable is inadequate. The significance level obtained from the conservation awareness survey demonstrates that livestock grazing possesses impacts on red pandas. Furthermore, the key informant interviewees claimed that rivalry for the same food, depletion of vegetation cover and degradation of forest are the main challenges to red panda provoked by grazing pressures.

Conclusions
The research provides a vivid overview of grazing impacts on red panda. Unsustainable grazing has negatively impacted the occurrence and habitat of red panda in the study zone. The absence of effective strategies related to livestock