Nature and species conservation often conflict with intensive natural resource or land use. Many protected areas are too small for long-term conservation of viable vertebrate populations, especially in Madagascar, and forests are subject to exploitation for a variety of natural resources. Trying to exclude people from the use of these resources has not been successful during economic, natural, or political crises or when human population growth outruns any development effort. People need economic and other benefits, and conservation measures have to account for these needs. We compiled native and introduced tree, shrub, and herbaceous species used by both people and native vertebrates for three regions, covering the domains of the dry, transitional, and humid forest of Madagascar. We carried out semistructured interviews and group discussions in 12 different villages in each study region in November 2017. People listed 139 utilitarian plant taxa. Our literature search revealed that 72 of these plant species and 13 genera used by people, were also used by 208 different terrestrial vertebrates including 58 lemur species. Application of the Forest Landscape Restoration approach with a combination of exotic and native plant species used by both people and animals could increase the economic value of restored forest habitats for people, thus providing incentives for forest conservation. Plantations of mixed utilitarian trees and shrubs could be integrated into agricultural landscapes. Among land-living vertebrates, lemurs seem to benefit most from this approach. These measures might contribute to a successful array of biodiversity conservation in anthropogenic landscapes.
The United Nations declared 2021–2030 the “Decade of Ecosystem Restoration,” aiming to reverse degradation in ecosystems worldwide (Gann et al. 2019). This serves the achievement of international development targets as stated in the Sustainable Development Goals and more specifically in the New York Declaration on Forests and the Global Bonn Challenge concerning the protection and maintenance of forests across Africa. This political support is needed urgently to foster restoration in the world’s biodiversity hotspots that have suffered from excessive habitat destruction, such as the native forests of Madagascar (Brinkmann et al. 2014; Harper et al. 2007; Waeber et al. 2015, 2016; Zinner et al. 2014). The African Forest Landscape Restoration Initiative (AFR100), a country-driven and African-led effort, aims to bring 100 million ha of forests and degraded forest landscape under restoration by 2030. As part of this Initiative, Madagascar has pledged to restore 4 million ha of degraded forest landscapes via the Forest Landscape Restoration approach by 2030.
Slash-and-burn agriculture remains the primary economic activity for many households, as opportunities for agricultural intensification are limited, and forested land is openly accessible in Madagascar (Gardner et al. 2016a, b; Hume 2006; Raharimalala et al. 2010; Styger et al. 2007). Over the past century, fallow periods became too short to ensure recovery of vegetation and soil conditions, resulting in increasing pressure on natural resources and declining agricultural productivity. The speed of fallow vegetation recovery and the changes in soil fertility of slash-and-burn cultivation sites has been well documented for a variety of sites (De Wilde et al. 2012; Gay-des-Combes et al. 2017; Klanderud et al. 2010; Leprun et al. 2009; Raharimalala et al. 2010; Styger et al. 2007; Zwartendijk et al. 2017). The restoration and transformation of fallow land to more productive permanent agricultural fields often failed, due to the high work load associated with sustainable cultivation techniques (manure and compost management) and further constraints such as limited resources for external inputs and marketing opportunities for agricultural products (Hume 2006).
At least in the eastern moist forests, natural forest gaps can regenerate well with native pioneer trees such as Harungana madagascariensis or Dombeya spp. (e.g., Martinez and Razafindratsima 2014). However, when the loss of tree cover is followed by landslides, mimicking slash-and-burn practices and fallow land, there are many cases in which the open land has been colonized by genera such as Rubus or Aframomum that form monospecific covers that seem to prevent the natural forest from regenerating (C. Welch, pers. comm.; Goodman et al. 2018). In the domain of the dry forest, regeneration after total clearance seems to follow three trajectories: natural forest regeneration (very slow), mostly monospecific stands of Ziziphus spp., or savannah covered by various grasses of limited value for livestock (Genini 1996). Thus, the species initiating a succession seem to be crucial for its further development.
Starting from degraded land that is no longer used by people, successions could be initiated with plants of possible use for people and the native fauna. To support the unique flora and fauna of biodiversity hotspots, forest restoration should favor native tree species. Yet, the profound local knowledge of indigenous plant species is still underexplored (e.g., Andriamparany et al. 2014) and from what is known scientifically, forest restoration with native trees is challenging due to higher costs, slower growth, and a lack of scientific species-specific knowledge of growth conditions (Birkinshaw et al. 2009; Lavialle et al. 2015). Also, given the high dependency of people on ecosystem services from forests and the pressure on forest resources by the rapidly growing human population, reforestation ‘just for animals’ may neither be acceptable for people nor sustainable (Gardner et al. 2016a, b). In contrast, reforestation using a handful of fast-growing tree species, such as various Eucalyptus and Acacia spp., has conservation value by providing the physical substrate for corridors and taking the pressure off the remaining forests (Andriamandimbiarisoa et al. 2015; De Wilde et al. 2012; Gérard et al. 2015; Irwin et al. 2010). However, these plantations do not contribute much to restoring functional habitats that can provide multiple ecosystem services. Thus, we are left with the inconsistency that, on the one hand, ecological forest restoration is good for the native fauna, but it provides too few ecosystem services for local people. On the other hand, plantations with exotic species provide financial revenues and some ecosystem services to local people, but too few benefits for animals. In response to this, many decision-makers have embraced the approach of Forest Landscape Restoration (FLR) in recent years, which seeks to reconcile biodiversity conservation and provision of ecosystem services for local people (Holloway 2003; Mansourian et al. 2017).
Our objective was to make better use of the local knowledge of the Malagasy inhabitants on the importance and usage of native plants and identify plant species of local importance that are also valuable for the native fauna. For this, we summarize the results of village surveys that could be relevant for forest restoration in three different regions of Madagascar, covering dry deciduous forest of the west, humid forest of the east, and a transition zone in the north of Madagascar. The goal of the study was to combine the human needs for forest resources and services with the objectives of nature and species conservation.
We conducted the study in the regions of Menabe (Kirindy, western dry deciduous forest), Diana (transitional forest in the north of Madagascar), and Alaotra-Mangoro (Andasibe, eastern humid forest). Kirindy and Andasibe are villages associated with long-term biodiversity studies in these areas. We use these names in this publication as they are best known to people. Names of all villages and their coordinates are listed in the Electronic Supplementary Material [ESM] Table SI. All three study regions have experienced forest loss and forest fragmentation, making them important candidates for restoration (Figs. 1 and 2).
Menabe/Kirindy The Menabe region is part of the dry deciduous forest of coastal western Madagascar. The climate is characterized by pronounced seasonality with little or no rain from April to November, followed by a rainy season from December to March. Annual precipitation averages ca. 950 mm and has increased by about 0.5% per year since 1981. Mean annual temperature in Morondava is 24.7°C (Goodman et al. 2018; Sorg and Rohner 1996). The region suffers from one of the highest deforestation rates of the country (Zinner et al. 2014). Main crops are maize, cassava, groundnuts, and different bean varieties. Agriculture is based on slash and burn cultivation. Fallow land is colonized rapidly by secondary grassland or by Ziziphus spp., forming monospecific thickets (Genini 1996).
Diana The Diana region is located in northern Madagascar and represents a very heterogeneous region with annual rainfall ranging from 1000 to 2000 mm. The study villages are situated in the drier parts of the region dominated by deciduous forest with annual rainfall of about 1200 mm, falling mostly between November and April. Daily mean temperature fluctuates between 20° and 31°C (Goodman et al. 2018). The main crop is rice. Some villages generate income through community-based eucalyptus tree plantations, installed in 1996 to supply the regional capital with charcoal (GIZ/GREEN-Mad 2007).
Alaotra-Mangoro/Andasibe The study villages are located in the Andasibe region. Natural forest belongs to moist evergreen forest with around 1700 mm of rain per year, mostly falling between November and April. Daily mean temperature varies 14.5–23.6°C (Goodman et al. 2018). Rice is the most important crop.
Data Collection and Analysis
Based on recommendations of organizations working in the different areas (Diana: PAGE GIZ; Andasibe: Mitsinjo; Kirindy: Centre National de Formation, d’Education et de Recherche en Environnement et Forestière [CNFEREF]), we carried out surveys in 12 different villages in each study region in November 2017 (ESM Table SI). The mean (± standard deviation) number of inhabitants per village was 805 (± 494, N = 10) in Diana, 636 (± 450, N = 12) in Andasibe, and 1452 (± 875, N = 12) in Kirindy. The “village” survey was based on semistructured interviews and group discussions at the village level (Bernard 2011). We informed the president and village elders about the pending surveys prior to the actual meetings. The Malagasy authors of this study ran the meetings, supported by local staff. All communication was in Malagasy. Meetings were open to all villagers interested in participating, but we assured that at least half of the participants were not older than 50 years. We considered age important to avoid samples biased toward age groups with specific economic or management experiences (e.g., older people no longer involved in everyday activities). We did not consider gender. Both men and women participated in the surveys but participation was biased toward males. Separate discussions with men and women would have been desirable but could not be organized within the scope of the study. Questions concerned the use of natural resources, historical developments, socioeconomic, health, and cultural issues. We report only the use of natural resources here. For this, we asked people to name plants of local importance according to predefined categories that either contribute to ecosystem services (crops, cash-crops, medicinal plants, wood resources, nonwood products of the forest) or are unwanted invasive plants (weeds). In each category, we formulated questions without further specification, translated as follows: Which plant products do you sell in the market? Which wild growing plants do people collect for food? Which medicinal plants do you use? What are the most important species used for charcoal? Are there plants (weeds) that you would like to get rid of? Which plants do you grow?
We translated local Malagasy plant species names into scientific names using personal knowledge and published lists (e.g., Schatz 2001; Sorg 1996). Plant vernacular names can vary between villages and even people from the same village. We did not consider plants for which a vernacular name resulted in more than two possible plant species, and species that could not be identified at least to the genus level.
We took information on plant use from the literature. We used the most up-to-date compilation of lemur food plants (Steffens 2020) to check whether lemurs consume any given plant species. We supplemented the data with data for other vertebrate taxa by searches in Web of Science, Google Scholar, books, and journals of regional relevance.
Prior to the surveys, the president and village elders were informed about the intended surveys and asked for approval. The survey was carried out only with their consent. The identities of participants were not noted and therefore will not be disclosed. Participants were not pressured or forced to answer any question if they were not willing to.
The datasets analyzed during the current study are available from the corresponding author on reasonable request.
People named 240 different plant species of interest to them. Of these, we could identify 118 to species level. We identified a further 21 to the level of genera that were characteristic enough to be used for further analyses, such as Adansonia spp. (containing only endemic baobabs of Madagascar), Dalbergia spp. (also containing mostly endemic species of precious wood), or Dioscorea spp. (yam varieties found in native forests).
Of the 139 plant taxa mentioned in the village surveys that we could identify precisely enough to search the literature for their use by animals, 72 plant species and 13 genera were used by a total of 208 different terrestrial vertebrate species (Tables I and II). Apart from goats, cattle, introduced rats (Rattus sp.) and mice (Mus sp.) and the introduced myna (Acridotheres tristis) all other species are native to Madagascar. The literature database is most comprehensive for lemurs. It includes 58 lemur species associated with the plant species reported by the villagers. Most of the vertebrate species (131 out of 208) included were not in the “threatened” IUCN Red list categories (Vulnerable, Endangered, Critically Endangered), but 50 of the 58 lemur species included fell into one of the threatened categories.
Excluding weeds and crops, at least 56 plant taxa are of interest to people. These include native and introduced herbaceous and woody species. People listed only five herbaceous plants of value to them, which they do not plant on purpose. Woody species represent the majority of utilitarian plants, not planted specifically, but used opportunistically over the year (Fig. 3).
Given the lack of investment options in Madagascar, fallow land taken out of the agricultural production could be used for conservation measures by initiating succession toward the restoration of native forests, including utilitarian plants at all successional stages. This would reduce the threat of succession being arrested at a certain stage. As it is unlikely that people will give up productive land for forest restoration our suggestion of using plants of dual use (usable by people and native animals) aims to restore fallow, unproductive land.
Once deforested, the first objective of restoration is likely to control soil erosion, maintain soil fertility, and grow pioneer plants that will provide the environment for seedlings of trees (Diemont et al. 2006; Klanderud et al. 2010). Herbs usually represent the first stages of natural succession (Raharimalala et al. 2010; Styger et al. 2007). Since herbaceous species are poorly represented in the data we compiled (Table II), we cannot speculate on the first steps of restoring fallow land. However, we are confident that local people have suggestions that can be followed. Later on, legume trees might be good candidates, as they fix nitrogen from the air. The multipurpose Tamarindus indica provides food and shelter for many native animal species and is a prime option for the drier parts of the country, although growth rates seem to be low (Ranaivoson et al. 2015). For humid forests, mango and litchi provide fruit for people and animals and Harungana madagascariensis is fast growing and can quickly cover degraded areas, providing food for birds and lemurs while serving medicinal purposes for humans (Birkinshaw et al. 2009; Rakotoarivelo et al. 2015; Steffens 2020). Adding plants with cultural and traditional values, such as tamarinds or baobabs, could further diversify the restoration and might add a “sense of place” component that protects forests beyond economic interests. In any case, it is crucial to come to a better understanding of the successional stages in regenerating Malagasy ecosystems by considering local knowledge (De Wilde et al. 2012; Ehrensperger et al. 2013; Gay-des-Combes et al. 2017; Klanderud et al. 2010; Leprun et al. 2009; Rabenantoandro et al. 2007; Raharimalala et al. 2010; Styger et al. 2007; Zwartendijk et al. 2017).
Adding native trees to reforestation projects has the potential to increase ecological complexity and ecosystem services (Brown et al. 2013; Ganzhorn 1987; Gérard et al. 2017; Holloway 2003; Lavialle et al. 2015; Martin et al. 2009, 2012; Rafidison et al. 2020; Zemp et al. 2019). However, they provide fewer direct financial benefits and risk adding disservices, such as antagonists to pollinators or increased herbivory (Wielgoss et al. 2014). Combining the various issues, we argue that forest rehabilitation using a mix of native and exotic species can be a good balance between benefits for people and benefits for the native fauna. By adding more native utilitarian plants or plants of cultural value, rehabilitated forests might be valued more by people and thus might have a higher chance of surviving and possibly developing into substitutes for the original forest (Fritz-Vietta et al. 2011). However, for such a balanced selection of rehabilitation species, we need to integrate scientific and local (practical) knowledge of the growth conditions and usage of native plants.
According to the present study, lemurs seem to be the group of vertebrates that would benefit most from this type of forest rehabilitation. Lemurs used almost all plant species we identified unambiguously and represented more than half of all vertebrates associated with utilitarian trees. More than 80% of these lemur species fall into one of the “threatened” IUCN Red List categories. This matches the general classification of lemurs as one of the most threatened taxa on earth (Schwitzer et al. 2014). The other vertebrate groups are poorly represented and mostly with species that are not considered threatened. This may be a sampling artefact, as few studies on nonlemur vertebrates have been completed in nonnative forests in these regions (Gardner et al. 2016a, b; Irwin et al. 2010; Martin et al. 2009, 2012; Ndriantsoa et al. 2017; Wilmé 2014).
An example of a reforestation project focusing not solely on the protection of species but also considering the needs of local people in southeast Madagascar was reported by Manjaribe et al. (2013). They planted a corridor consisting of three types of plants. The main part of the corridor consisted of plant species consumed by black-and-white ruffed lemurs (Varecia variegata), the remaining parts were divided into a timber and a nontimber tier, including plant species most frequently used by the local community for fuel production or construction, as well as a source of food or other products of commercial value. While there are plenty of examples of native animals using crop and forest plantations (e.g., Chapman et al. in press; Gardner et al. 2010; Irwin et al. 2010; Schwitzer et al. 2011), we are unaware of any example that explicitly uses plants of interest for people and animals alike and thus avoids the issue of the two “parties” competing for limited space. The plantation of utilitarian trees around the forestry station of Ampijoroa in northwestern Madagascar at colonial times, comes closest to the concept of multiuse plantations (fruit, timber, and other economic value trees) for people, but also designed to extend suitable habitat for lemurs (Ganzhorn and Abraham 1991).
Though utilitarian plants and crops offer a large, yet unexploited potential for restoration, care must be taken to avoid conflicts of interest. Though systematic surveys are lacking, anecdotal reports indicate that people in Madagascar do not tolerate animals eating their crops, such as Hapalemur spp. eating rice plants in the humid forests (Martinez 2008; T. Eppley, pers. comm.) or parrots and finches eating crops in the western part of Madagascar. Fruit trees seem to be less of a problem as long as people do not embark on industrial fruit production for the national or international market. In this context, mixed or fully utilitarian forests such as plantations or agroforestry systems could benefit local communities and function as habitat extensions or corridors for vertebrates including lemurs. For example, lemurs use vanilla and cocoa plantations in northern Madagascar (Hending et al. 2018; Webber et al. 2020). However, when animals such as birds, flying foxes, or lemurs feed on fruits of trees also used by humans, they can transmit zoonotic diseases through contamination of fruits by feces. Diseases can range from salmonellosis to more dangerous viral diseases (Iehlé et al. 2007; Joffrin et al. 2020). This problem may not be as pronounced in plants used by people for medicinal purposes or charcoal production. Species targeted for wood or charcoal production or for the international furniture market may be good candidates to be used by many vertebrate species as well as by humans. These can include many species of precious wood, such as Dalbergia spp. that not only have suffered from illegal exploitation (the “rosewood crisis”; Wilmé et al. 2020) over the last few years, but have also traditionally been the most appreciated wood for cooking (Razafintsalama et al. 2014).
Apart from direct, unwanted, interactions with humans, vertebrates can contribute substantially to the dispersal of seeds and thus accelerate the invasion of species that may be of value to people and animals but are not wanted from a conservation point of view. These include neem trees (Azadirachta indica), guava (Psidium guajava), Ziziphus spp., or Morus spp. (Carrière et al. 2008; DeSisto et al. 2020; Kull et al. 2012). Moreover, many of the more than 20 plant taxa people listed as “weeds” (e.g., Clidemia hirta, Lantana camara, and Rubus spp.) are dispersed by frugivores. However, the perception of “weed” depends on context and might change over time (Kull et al. 2012; McConnell et al. 2015; Tassin and Kull 2015). For example, Sorghum bicolor (L.) Moench was planted as a crop well adapted to dry conditions in the west, but the harvests were compromised by birds and thus the cultivation was abandoned. Whatever was left in the region is now considered a “weed.” Clidemia hirta is known as an invasive species that colonizes open areas quickly and park authorities make great efforts to remove it. Yet, Clidemia hirta allowed the frugivorous black-and-white ruffed lemur (Varecia variegata) to survive in forest fragments after a cyclone had blown down their fruit trees (Ratsimbazafy et al. 2002) and plays a major role in restoring rainforest in northern Madagascar (Martinez and Razafindratsima 2014). Similarly, guava (Psidium guajava) is invasive in parts of Madagascar, but this exotic plant was observed to play a key role in the survival of collared brown lemurs (Eulemur collaris) in the Mandena Conservation Zone, southeast Madagascar (Donati et al. 2020; Kull et al. 2012). Though not covered by the present study, the introduced Opuntia spp. is an example of repeated changes in its appreciation. Currently, this plant is considered an invasive weed in the dry parts of Madagascar but is used by lemurs and guaranteed the survival of people and their livestock during droughts in the past (Jolly 2004). It has recently been identified as a possible source of substantial economic income through the production of essential oils (Hänke et al. 2018), so may yet become desirable. Acacia spp. may include invasive species that are hard to control or remove once they have invaded natural systems, but not all species are invasive and as fast-growing legumes, that are fire resistant and retardant, they have a high potential to restore soil fertility and provide firewood from denuded areas. In many areas largely void of vegetation cover and with an exhausted seed bank, these “weeds,” which are valuable to people, might be a first step to stop erosion, restore soil fertility (especially legumes), and thus provide the basis for the development of more complex ecosystems (Gay-des-Combes et al. 2017; Randriamalala et al. 2015; Zwartendijk et al. 2017).
To our knowledge, the concept of designing restoration projects focusing on plants to be used by humans and animals alike is lacking for Madagascar and other parts of the world. Although a thorough ecological and economic cost–benefit analysis must be made before applying the concept, the present study illustrates that there is a treasure of options and knowledge in the local human communities that should be paid more thorough attention.
The village surveys led to two major insights: First, there are many plant species of interest to people and native vertebrates alike, which could be used for restoration and that could provide economic income at various temporal scales, ranging from years (native yams) to decades and even centuries (native precious wood). The known diversity of possible plants is rarely used in restoration projects. Second, the surveys did not provide a complete list of plants that could be or were used by people. The whole aspect of honey production has not been considered (Eco-Services Consulting 2017; Fohavelo and Gulley 2000), and the medicinal plants mentioned in the surveys comprise only a fraction of the plants that people actually use (e.g., apart from their crops, people from Menabe listed 22 plants of value in the present compilation, while a previous study in the region described 151 species collected and used for many more different purposes [Favre 1990, 1996]). Similarly, an ethnobotanical study in 13 villages close to Andasibé reported 209 medicinal plants used by people (Rakotoarivelo et al. 2015) while our survey revealed only 34 species for the 12 villages we visited. Apart from the obviously incomplete sampling of information, we had to discard about a third of the data provided by the villagers because we could not link their names to our system. This exemplifies how little we know about the possibilities available. It also illustrates a huge, yet unexploited, knowledge that could be used for restoration without additional costs, except that of listening to local people (Marie et al. 2009).
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We thank Giuseppe Donati, Kate Hill, and Aimee Oxley for having invited us to the symposium in Oxford and to write this contribution. The ideas were developed over many years of most fruitful collaboration between the universities of Antananarivo and Hamburg with support by Madagascar National Parks and WWF. PAGE GIZ, Mitsinjo, and the Centre National de Formation, d'Education et de Recherche en Environnement et Forestière (CNFEREF) helped greatly in completion of the village surveys. We thank Giuseppe Donati, Joanna Setchell, and the reviewers for valuable comments to improve the manuscript. The work was supported by the German Ministry for Education and Research (BMBF 01LC1708) and the Center for a Sustainable University (KNU), University of Hamburg.
Open Access funding enabled and organized by Projekt DEAL.
Handling Editor: Joanna Setchell.
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Konersmann, C., Noromiarilanto, F., Ratovonamana, Y.R. et al. Using Utilitarian Plants for Lemur Conservation. Int J Primatol 43, 1026–1045 (2022). https://doi.org/10.1007/s10764-021-00200-y
- Forest landscape restoration
- Forest restoration
- Tree plantations