Why they eat, what they eat: patterns of wild edible plants consumption in a tribal area of Western Himalaya

Background From time immemorial, wild plants have been used for edible purposes. They still continue to be a major source of nutrition for tribal people. However, unfortunately, their use is now declining. This has implications in food security, narrowing genetic base, and future leads. The present study was, therefore, carried out in Chhota Bhangal region of Western Himalaya to analyze uses of wild edible plants (WEP) and the motivations behind their use or abandonment. Methods Field surveys were conducted to the study area from January 2016 to March 2017. Household surveys, group discussions, free listing, and structured questionnaires were used to elicit information on WEP. WEP use was categorized into six categories (vegetables, fruits, chutney, flavoring food, raw food, and local brew). Trends of use (continuing, decreasing, increasing, and not used) and motivations (environmental, economic, sociocultural, agriculture and land use practices, and human-wildlife conflict) behind their use were analyzed. Results Fifty plant species were used by the local people for edible purposes under six WEP categories. Mean and median of WEP used per respondent was 22.3 and 21, respectively. Highest number of these were used as vegetable (mean 8.9) while lowest were used as brew (mean 0.4). Out of the 50 WEP used, 20 were prioritized for motivation analyses. Though plant use is still maintained in the area, changes are evident. Almost 50% of the respondents revealed that they still continue the use of WEP while 36% reported trends of declining use as compared to 5–10 years back. Close to 10% respondents have stopped consuming WEP now and ~ 3% reported an increase in the use of WEP. Among the WEP categories, use of chutney showed an increasing trend. Sociocultural motivations were found to play a prime role, both, in limiting and promoting WEP use. Taste and aroma were the major sociocultural reasons behind using WEP while modernization and changing lifestyle were the main reasons behind declining use of WEP. Conclusions The study concludes that though use of WEP is still maintained in the area, changes in consumption trends are evident. Sociocultural motivations guided use of WEP in the area.


Background
Wild edible plants (WEP) represent species that are collected from the surrounding ecosystems for human consumption but are not cultivated [1]. Surrounding ecosystems include forests, pastures, and fields. FAO defines them as "plants that grow spontaneously in self maintaining populations in natural or semi-natural ecosystems and can exist independently of direct human actions" [2]. Thus, WEP are locally available, low input options for nutrition. Prior to coming up of agriculture, some 10,000 years ago, they formed a prime component of human food [3]. Throughout history, WEP have enabled humans to tide over times of wars and natural calamities [4,5]. Thus, uses of WEP have been widely studied, both, in developed and developing countries [6][7][8]. It has been revealed that the number and frequency of species used varies with culture and location [9][10][11]. At the individual country level, 300-800 different species have been reported to be used for edible purposes [12,13]. Another study reports that humans have used more than 7000 WEP during some stage in their history [14]. Still today, WEP complement diet of 1 million people of the world [15] and continue to be a major source of food for tribal and rural communities [16,17]. Their importance in poverty reduction, ensuring food security, agricultural diversification, income generation, and nutrition has been specially emphasized [18][19][20]. It is now being argued that WEP are a rich source of vitamins and nutrients [5,[21][22][23][24] and can significantly contribute towards alleviating malnutrition [15].
On the one hand, importance of WEP is being recognized globally, on the other, a decline in their consumption as well as the knowledge associated with them is evident [25][26][27]. Developmental activities, socio-cultural transformations, environmental changes, lack of interest among young generation, and declining resources are cited to be the major reasons for this [21,[28][29][30][31]. Therefore, studies on WEP consumption are contemporary areas of research [32]. Such studies, especially in interior areas where dependency on natural resources is still very high and at the same time they are undergoing rapid transformations, have been emphasized [33][34][35][36].
Recognizing this, the present study was carried out in Chhota Bhangal-an interior tribal area in the Himalayan state of Himachal Pradesh. The objectives framed for the study include 1: documentation of WEP consumed in the area, and 2: identification of motivations and trends associated with their consumption.

Study area
The study area lies in the lap of Dhauladhar Mountain range at co-ordinates 32°04′32.83″ N and 76°51′30.45″ E in the West Himalayan state of Himachal Pradesh. Owing to its location, Chhota Bhangal receives heavy rainfall from July to September with annual rainfall close to 1500 mm. Winters are chilly, with January being the coldest month and often reporting sub-zero temperatures. Summers are usually pleasant with maximum temperature going up to 34°C in the month of June [37]. Geologically, quartzite rocks of Saluni formation characterize the area while the soils are fertile loam to clayey loam. Uhl and Lambadug rivulets drain the area [38]. Oaks and conifer dominate the forests with birch and rhododendron forming the tree line. The area is rich in medicinal plants that are heavily traded from the region [39].
The residents of the area (referred as Bhangalis) are mainly agropastoralists and depend on the surrounding resources for livelihood including plants for edible purposes. Their knowledge on plants is exhibited in their local sayings and uses [40]. Natural landscape, trout farms, and adventure tourism such as paragliding are transforming the place into an important tourist destination. The 2015 world paragliding championship took place in the vicinity of the study area (http://www.pwca.org/node/24227). Therefore, the area is undergoing many developmental activities that have resulted in the movement of heavy machinery and coming up of roads [37,38]. This has resulted in socio-economic changes and modernization in the area.

Surveys
The work involved field surveys, interactions with Bhangalis, recording of data, analyses, and interpretation of the collated information. Field surveys to the study area were conducted from January 2016 to March 2017. In the initial reconnaissance surveys seven villages were identified for intensive interviews and fieldwork (Table 1). These villages are representative of the area and are located on both the banks of river Lambadug. These were selected following our earlier work in the area [39][40][41]. Door-todoor surveys in these villages were conducted and information on age, gender, literacy, and use of WEP was collected using structured interviews [42]. Besides, focus group discussions were also held in each village. This involved free listing of WEP and detailed notes on their methods of preparation [43]. For this, prior informed consent was taken from the people and they were informed about the purpose and nature of the study. An oral agreement to participate in the study was received from them.
Based on household surveys (n = 423), an inventory of WEP used by the local people was prepared (Table 2). Based on the purpose of use, these WEP were then categorized into six categories, namely, vegetables, fruits, chutney, flavoring food, raw food, and local brew (Table 3) [27,44]. Top three to five most referred WEP in each of the category were identified for detailed analyses and documentation [31]. Thus, 20 plant species that includes a fungus were prioritized for analyzing trends and motivations behind their use [45]. Considering that local people classify fungi as a plant, the same was analyzed along with plants. For trend analyses, 176 villagers including men and women of different ages were randomly selected [30,31]. Personal interactions using structured questionnaires were then conducted with these identified villagers (n = 176). Information on consumption of WEP in the past and present times was recorded. Additionally, motivations   Occasionally behind using WEP and reasons for their abandonment were also noted. Data so collected were analyzed for species richness, taxonomic diversity, and plant part used for edible purposes. Analyses of trends of WEP use were also done. These trends/patterns were categorized into continuing use, declining use, increasing use, and not used ( Table 4). The motivations/reasons behind these trends were then identified. These motivations encompass explanations pertaining to environment, economy, sociocultural, agriculture and land use changes, and human-wildlife conflict (Table 5). Voucher specimens were collected and have been deposited in the herbarium of CSIR-Institute of Himalayan Bioresource Technology, Palampur (Acronym PLP).
Overall, mean number of species listed and used per respondent was 23.7 (median − 21) and 22.3 (median − 21), respectively. Most of these were used as vegetable (mean − 8.9, median − 9) followed by fruits (mean − 6.3, median − 6). An average of 3.2 species (median − 3) were   Increasing use Species that were consumed in lesser amount in the past but now more used Not used Species that were used earlier but are not used now used as chutney whereas the mean number of species used as flavoring foods was 2.2 (median − 2). The average number of species per respondent in case of raw food and local brew was 1.4 (median − 1) and 0.4, respectively.

Trends in WEP consumption
As mentioned in methods, of the total 50 WEP, 20 species were prioritized for trend analyses. These include four used as vegetables, five as fruits, and four each as chutney and flavoring food, three as raw food, and one species as local brew (Table 6). Oxalis latifolia was used both as raw food and chutney. Species falling under the head fruits and raw food were consumed as such by the people. These include Berberis aristata, Juglans regia, Oxalis corniculata, Oxalis latifolia, Prunus armeniaca, Prunus cornuta, Rubus ellipticus, and Rumex dentatus. Plants collected for other purposes were consumed after processing. The study revealed that more than 50% of the respondents had ever consumed the prioritized WEP in the area during their lifetime. Among the six WEP categories, most of the respondents (68.75%) favored continuing use of chutney and only 5.68% respondents favored continuing use of WEP for local brewing. With respect to vegetables, 64.77% of the respondents reported a continuing use trend while 35.23% revealed its declining use (Table 7). On comparing continuing and declining use, highest number of respondents in all the WEP categories were for continuing use barring flavoring food and local brew, where the percentage of respondents was highest for declining use, i.e., 54.55 and 50.57%, respectively (Table 7). In case of chutney, an increasing use trend was observed. Close to 23 % of the respondents who were not consuming it earlier are now consuming it. This was the only WEP category in which an increasing use trend was recorded (Table 7). It was found that few respondents had not used the prioritized plant species during the past 5 years. This includes 1.14% of the respondents for chutney category, 7.95% for flavoring food, 9.66% for raw food, and 43.75% for the local brew.
None of the respondents reported of having not used the prioritized vegetables and fruits during the past 5 years.
Overall, irrespective of the WEP category, 49.24% of respondents continue use of WEP while 10.42% reported not using them now. Declining use of WEP was reported by 36% of the respondents (Table 7).

Motivations for WEP consumption
There were a total of 1341 responses offered by the 176 respondents for motivations that inspire or limit WEP consumption. A similar response given by two different respondents has been counted as two individual responses. As detailed in the methods, all these responses have been clubbed under five different motivation categories, namely, environmental, economy, sociocultural, agriculture and land use changes, and human-wildlife conflict.
Of the total 1341 responses, 743 (55.41%) were for motivations leading to the continuing use of WEP, while 529 (39.45%) were for their declining use (Table 8). Highest number of responses (82.55%) fall under the sociocultural motivation category and lowest under the agriculture and land use changes category. Environmental motivations accounted only for 11.48% of the total responses, while only 2.83% cited the economic motivations (Table 8).

Motivation explanations
It was observed that WEP consumption was guided by 25 motivation explanations under the five motivation categories (Table 9). Sociocultural category accounted for largest number of the explanations (n = 17) followed by environmental (n = 3), economic and human-wildlife conflict (n = 2 each), and   (Table 9). With respect to consumption trends, out of 25 motivation explanations, 9 explanations were for continuing use, while 12 were for declining use, and the remaining for increasing use. As pointed earlier, only WEP chutney category had an increasing use trend.
Here-in four explanations were given for increasing use by 41 respondents. Of the 17 explanations that represented sociocultural motivation category, 7 were for continuing use, 6 for decreasing use, and 4 for increasing use of WEP (Table 9). In general, it was observed that out of the total responses, highest (36.54%) were related to taste and were instrumental in continuing consumption of WEP. Close to 17% of the responses were related to changing lifestyle that accounted for declining use of WEP ( Table 9). Both of these represent the sociocultural motivation category. Lack of knowledge regarding the specific use of plants species (5.29%), and reduced availability of species due to changing environmental conditions (5.22%) were the other common responses behind the declining use of WEP (Table 9). Local interest and preference for taste were the two main reasons (2.91 and 1.86%, respectively) for the increasing use of WEP (Table 9). Free availability (2.31%) also had a role to play in continuing use. Changes in land use practices (0.37%), and human-wildlife conflicts such as forest degradation, attacks on humans, and crop depredation by wild animals also resulted in the declining use of WEP (2.76%) ( Table 9).

Discussion
Wild edible plants continue to satiate human diet especially in interior areas such as the Himalaya [24]. Out of    [47]. In the present study, though total number of WEP species reported was comparatively low (50), mean of WEP used was higher (22.3). On the other hand, in Poljica and Krk islands, Croatia total number of wild edible species used was higher [48]. However, mean species used per interview was low [47,48]. It reveals that local people individually use more species in the present study area. In Imereti region of Western Georgia, 53 wild species with a mean of 10.4 species per interview have been reported to be used for edible purposes [49]. Similar results have also been presented from the Gongba Valley of China [11].  Alike other studies, vegetables formed a prime component of WEP in the area. In the present area, mean number of species used as vegetables per respondent (8.8) was higher than mean number of species used in any other WEP category. Here, alike other Himalayan regions, people dry the seasonally available vegetables for use during periods of snowfall [11]. This shows the importance of plants for sustenance and nutrition in the interior areas. A mean of 7.5 species per interview has been reported to be used as vegetables in the Gansu province of China [47], while 8.7 species of green vegetables per interview has been reported to be used in Gongba valley of China [11]. At the same time, similar mean number of species as in the present area (6.3) have been reported to be used as fruits in the Gansu province of China (6.3). In Gongba valley of China and Imereti region of Western Georgia, mean number of species used as fruits is 6.9, each [11,47,49].
Trends in changing WEP use patterns are evident in the area as has been reported from across the globe [8,32,50]. Declining use of WEP has severe implications for future prospections and leads to narrowing of genetic base [9,30,31]. In the present study, people reported increasing use of WEP as chutney (23.30%), more than 50% reported a declining use of WEP as flavoring food (54.55%) and also as local brew (50.57%). The reasons for this could be low populations of flavoring food species and the extra effort required for their collection. Findings from Saaremaa, Estonia show similar patterns where people would not like to go to distant places and search for WEP now [51]. In Patagonia, South America also targeted efforts for collecting wild foods has limited their gathering and use [52]. At times, regulations also have a role to play in declining use of WEP. In the present area, local alcohol brewing requires permission, otherwise it is illegal. In Catalan Pyrenees and Balearic Islands also restrictions were pointed as a reason leading to declining use of WEP [31]. Increasing use trend of chutney may be because WEP used for making chutney are often found around villages and are required in low quantity. Few workers have also reported such an increase in consumption of specialized plant species where the volume required is low [30]. In the present area, Aesculus indica is used as a specialized food for expecting mothers. The fruits of this plant are thoroughly washed, dried, and ground. The flour so obtained is used for making the recipe-seek. Use and preparation of the recipe has been provided in a separate publication by the authors [40]. Studies on WEP that require specialized processing are now receiving much attention. This has been discussed in detail for the comfrey and buttercup eaters of the Imereti region, Western Georgia [49].
Irrespective of the WEP category, sociocultural motivations were found to play an important role in defining continuing, declining, and increasing use of WEP in the present study. Elsewhere also, studies have highlighted sociocultural factors to play a major role in WEP use [23,25,30,53]. In the Catalan Pyrenees and Balearic Islands, taste was reported to be a prime motivation for continuing consumption of WEP while lifestyle changes led to abandonment of WEP consumption [31]. In Saaremaa, Estonia also use of WEP have been related to taste [51] while the disappearance of familiar taxa from surrounding areas has been linked to their declining use [51]. Similarly, while taste and aroma were the major sociocultural motivations for continuing use of WEP in the present study, changing lifestyle pattern was the prime reason for their declining use. Many studies have noted the importance of traditional culture in maintenance of WEP consumption [54,55]. In Iberian Peninsula, despite an overall decreasing trend, uses of WEP of high cultural appreciation and recreation was found to be still maintained [30]. On the other hand, modern lifestyle and market availability of resources have limited the use of WEP [21,28,29,[56][57][58]. In some areas, collection of WEP is now seen as something that is old fashioned [59]. Interestingly, we found, people prefer to sell WEP in the market and earn hard cash rather than consume WEP themselves (Figs. 3 and 4). As reported, market forces and changes in agriculture and land use practices affect traditional lifestyle and WEP use [60,61]. In the present area, cash crops are replacing traditional crops and thus land use changes are also responsible for declining use of WEP. Conversion of forest land and degradation of resources leads to human-wildlife conflict, which in turn also limits WEP use. In Saaremaa, Estonia, though in minor proportions, the fear of poisonous snakes and insects has limited the use of WEP [51]. This has also been noted in Catalan Pyrenees and the Balearic Islands [31], and in Rio Grande do Sul, south Brazil [62]. In the present study, close to 3% of the responses point to easy access and large population as prime reasons behind consumption of WEP. This clearly indicates that people do not like to wander into the interiors for searching WEP. They would rather prefer using plants that are available in their vicinity. It has been pointed out that free and easy availability of resources motivates its use by the local inhabitants [59]. Further, WEP with multiple utility such as associated health benefits are preferred for consumption [26,51]. In Patagonia, changing environmental conditions are documented to have negatively affected WEP consumption [63]. Interestingly, in the present area also people cited that shortfall in rains has resulted in a decline in availability of some species (especially ferns). This consequently, has limited their use.

Conclusion
The study concludes that though use of wild edible plants is still maintained in the area, a change in consumption trends is evident. Sociocultural motivations were found to play a prime role in, both, limiting and promoting WEP consumption. While taste and aroma were the major sociocultural reasons behind using WEP, modernization, and changing lifestyle were the main reasons behind declining use of WEP.