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22 May 2018 A contribution to the knowledge of epiphyllous bryophytes in Tianmushan National Nature Reserve (Zhejiang, China), with remarks on climate warming and nature conservation
Xia Tang, S. Robbert Gradstein, Li-Wei Sun, Mao-Jie Zhu, Rui-Ping Shi, Qian-Qian Wei, Yu-Qi Chen, Xiao-Xu Zhou, Jian Wang
Author Affiliations +
Five epiphyllous liverwort species, all members of the family Lejeuneaceae, are newly reported from Tianmushan National Nature Reserve, Zhejiang Province, China. The locality constitutes the northernmost occurrence of epiphyllous bryophytes in eastern China. It is proposed that the establishment of the epiphyllous species in the reserve was the result of a recent dispersal event influenced by climate warming. The site where the species occur is increasingly impacted by ecotourism and forest ecology teaching. Limitation of teaching at the site, reduction of the number of trails and stricter conservation is recommended in order to protect the fragile local epiphyllous community.

Epiphyllous bryophytes mainly occur on leaves of vascular plants, in the understory of moist tropical and subtropical forests (Richards 1984, Jiang et al. 2014), and more than 95% of the species are members of the liverwort family Lejeuneaceae (Pócs 1996, Gradstein 1997). They occur in 21 floristic regions of Asia, Australia, Africa, America and Europe, with Asia having the highest diversity with more than 500 known species of epiphylls (Pócs 1996). Outside the tropics and subtropics, epiphyllous bryophytes are rare (Duckett 2008). In China, the distributional ranges of epiphyllous liverworts are restricted to south of 31° N, including 11 provinces (Anhui, Fujian, Guangdong, Guizhou, Hainan, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan and Zhejiang) as well as the regions of Guangxi, Xizang and Hong Kong, at elevations ranging from sea level to 3000 m (Zhu and So 2001, p. 27). Highest species numbers are found in cloud forests of Yunnan, Hainan and Taiwan between 700 – 1600 m (Zhu and So 2001).

Being negatively affected by direct sunlight and reduction of air humidity, epiphyllous bryophytes are very sensitive to climate change and forest modification, and hence are potential indicators of forest health (Alvarenga et al. 2009, Frego 2007, Pócs 1996, Zartman 2003). Negative impacts on the structure of the canopy or other layers of the forest may result in impoverishment or loss of the epiphyllous communities. The invasion of weedy angiosperm species unsuitable as hosts for epiphylls may also negatively influence the epiphyllous bryophyte flora (Pócs 1996).

Over the past 30 years, China has experienced rapid economic development, accompanied by increased emission of greenhouse gases, ozone precursors and aerosols, and made a contribution to global radiative forcing (Li et al. 2016). The rapid economic growth as well as the increased tourism activities had a significant impact on the environment (Jiang and Shao 2016).

Tianmushan National Nature Reserve (TNNR) in the province of Zhejiang (119°23′47″–119°28′27″E, 30°18′30″–30°24′55″N), lies at the northern limit of mid-subtropical zone and covers a total area of 4284 hm2. The reserve is part of the International Biosphere Reserve (MAB) network and is located in the Yangtze River Delta region, which is the most populous and fastest growing area in China. The area has a damp monsoon climate with an annual precipitation of 1390–1870 mm and an annual temperature of 8.8–14.8°C. The reserve is one of the sites with the richest subtropical higher plant flora in China. More than 2000 species of plants have been recorded from the reserve, including the last surviving wild population of Ginkgo trees. Animal resources of the reserve are also very rich, including 341 vertebrate and 4209 insect species according to current knowledge (Chen 2006). In addition, the reserve has been a famous mountain for Tao religion since the West Han dynasty (around 2000 years ago).

The scenery, rich biodiversity and religious constitution have made TNNR a famous ecotourism destiny in east China (Li 2004). The number of annual visitors has increased from 40 000 to 210 000 in the last 30 years (Wang et al. 2013). In addition, the reserve serves as an important field practice base for more than seventy universities in east China. These activities have had negative influences on the environment of TNNR and its biodiversity (Yan et al. 2009, Zhu et al. 2006). For example, bird song in the reserve has become reduced (Li 2004) and bryophyte diversity, especially liverwort diversity, has declined since 1977 (Li et al. 2006, Wang et al. 2012, 2013).

Figure 1.

The locality of epiphyllous bryophytes in TNNR (green dot).


In order to better understand the impact of rapid economic development and tourism activities on the environment and the declining biodiversity, we are conducting surveys of bryophyte diversity in TNNR and other mountain areas in east China with support of the Ministry of Science and Technology, China. Bryophytes have been inventoried in TNNR on a regular basis since 1981 (Hu and Wang 1981). In the course of the field investigation in TNNR in the spring of 2017, we found five epiphyllous species, all belonging to Lejeuneaceae (Fig. 1, 2). This is the first observation of epiphylls in TNNR and the northernmost known occurrence of epiphyllous bryophytes in eastern China. Previously, the northernmost location of epiphyllous bryophytes in eastern China was in Qimen County (29°39′N, 117°31′E), Anhui Province, about 200 km south of TNNR (Fig. 3, 4). In view of the declining bryophyte diversity in TNNR, the discovery of epiphyllous bryophytes in this reserve was unexpected.

Figure 2.

The locality of epiphyllous bryophytes in TNNR where the habitat has become a forest ecology teaching point.


The five epiphyllous species detected in TNNR are listed below together with details on locality, elevation, habitat and voucher number. The importance of the new records is discussed with reference to climate warming and nature conservation.

List of epiphyllous bryophyte species found in TNNR

Cololejeunea japonica (Schiffn.) Mizut.

Near the protection bureau, 30°19′03.3″N, 119°26′90.0″E, 333 m, on Trachycarpus fortune, 26 Apr 2017, J. Wang et al. 20170426-10B (HSNU); 30°18′60.0″N, 119°26′65.5″E, 320 m, on T. fortune, 26 Apr 2017, J. Wang et al. 20170426-20, 20170426-22, 20170426-23, 27 Apr 2017, 20170427-6A, 20170427-8B, 20170427-9, 20170427-10, 20170427-11, 20170427-12, 20170427-13, 20170427-14 (HSNU).

Cololejeunea japonica often occurs near human habitation. The species is easily confused with C. magnistyla but differs in its 1–2-celled stylus (Mizutani 1961, Zhu and So 2001).

Range: China (Fujian, Jiangsu, Shanghai and Zhejiang), Japan and Korea (Jia and He 2013, Zhu and So 2001).

Cololejeunea longifolia (Mitt.) Mizut.

Near the protection bureau, 30°19′03.3″N, 119°26′90.0″E, 333 m, on Camellia sinensis, 26 Apr 2017, J. Wang et al. 20170426-7, 20170426-8, 20170426-9, 27 Apr. 2017, 20170427-3 (HSNU).

Range: Bhutan, China (Anhui, Chongqing, Fujian, Guizhou, Guangdong, Guangxi, Hainan, Hubei, Hunan, Jiangxi, Shandong, Sichuan, Taiwan, Xizang, Yunnan and Zhejiang), India, Japan and Korea (Jia and He 2013, Zhu and So 2001).

Cololejeunea raduliloba Steph.

Near the protection bureau, 30°19′03.3″N, 119°26′90.0″E, 333 m, on T. fortune and Lithocarpus harlandii, 27 Apr 2017, J. Wang et al. 20170427-6D, 20170427-8A (HSNU).

Range: Africa (east African islands), Australia (Thiers 1988), China (Fujian, Guangxi, Guizhou, Hainan, Hong Kong, Hubei (nov.), Hunan, Jiangxi, Shanghai, Taiwan, Yunnan and Zhejiang), Fiji (Pócs et al. 2011), India (Assam), Indonesia, Japan, Korea, Micronesia, Nepal, New Caledonia (Hürlimann 1987), and Vietnam (Jia and He 2013, Zhu and So 2001).

Cololejeunea spinosa (Horik.) Pandé & Misra.

Near the protection bureau, 30°19′03.3″N, 119°26′90.0″E, 333 m, on T. fortune, 26 Apr 2017, J. Wang et al. 20170426-10C (HSNU), on T. fortune and L. harlandii, 27 Apr 2017, J. Wang et al. 20170427-4, 20170427-6C (HSNU).

Cololejeunea spinosa is a very common species in several provinces of China. The species is characterized by its narrowly ovate leaves, spinose dorsal protrusions of leaf cells, more or less reduced leaf lobule, erect-spreading first tooth and smooth ventral surface of leaf lobule (Zhu and So 2001).

Range: China (Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hong Kong, Hunan, Jiangxi, Sichuan, Taiwan, Xizang, Yunnan and Zhejiang), India, Japan, Korea, Nepal and Philippines (Jia and He 2013, Zhu and So 2001).

Microlejeunea punctiformis (Taylor) Steph.

Near the protection bureau, 30°19′03.3″N, 119°26′90.0″E, 333 m, on T. fortune, 26 Apr 2017, J. Wang et al. 20170426-10D (HSNU), on L. harlandii, 27 Apr 2017, J. Wang et al. 20170427-6B (HSNU).

Figure 3.

Distribution of Cololejeunea japonica (green dot), C. longifolia (red dots) and C. raduliloba (purple dots) in eastern China.


Range: Bhutan, China (Anhui, Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hong Kong, Hubei, Hunan, Jiangxi, Sichuan, Taiwan, Xizang, Yunnan and Zhejiang), India, Japan, Nepal, Thailand, Sri Lanka and Vietnam (Jia and He 2013, Zhu and So 2001).


Not surprisingly, all five epiphyllous species found in this study are members of Lejeuneaceae. The taxonomic diversity of epiphyllous bryophytes is highly restricted and contains members of mainly three families — the liverwort families Lejeuneaceae (containing more than 95% of the species) and Radulaceae, and the moss family Hookeriaceae s.l. (Gradstein 1997). All epiphyllous species found in this study, with exception of Microlejeunea punctiformis, are members of the genus Cololejeunea. With almost 500 accepted species worldwide, Cololejeunea is the largest genus of the Lejeuneaceae and the third-largest genus of the liverworts, after Plagiochila and Frullania (Söderström et al. 2016). The species of this genus frequently grow epiphyllous and may freely produce spores and gemmae, enhancing dispersal and survival of these taxa in the ephemeral epiphyllous habitat. The common occurrence of neotenic evolution in the genus, including primary neoteny and protonemal neoteny (Gradstein et al. 2003, 2006, Yu et al. 2013), are unique evolutionary adaptations of Cololejeunea species to their ephemeral habitat (Gradstein 1997).

Figure 4.

Distribution of Cololejeunea spinosa (red dots) and Microlejeunea punctiformis (green dots) in eastern China.


Of the four Cololejeunea species found in TNNR, three were found with sporophytes and gemmae, only Cololejeunea raduliloba was found just with gemmae. Bryophytes are easily dispersed by diaspores of spores or gemmae (Vanderpoorten and Goffinet 2010). We postulate that the colonization of leaves in TNNR by these Cololejeunea species was the result of a recent dispersal event by spores or gemmae, while Microlejeunea punctiformis, a species in which sporophytes and gemmae are unknown, could have arrived by means of caducous stem fragments. We also suggest that the establishment of the epiphyllous liverworts detected in TNNR may have been a recent event influenced by climate warming. This prediction is based on the assumption that species distributional patterns are strongly influenced by temperature changes and that the distribution area of epiphyllous bryophytes is hence expected to shift northward in the Northern Hemisphere caused by climate warming (Alsos et al. 2007, Guralnick 2007). Mean annual temperatures in eastern China have risen by 1.5°C between 1980 and 2016 (data from NOAA's National Climatic Data Center, calculated from 23 selected grid). Shifts of species towards higher latitudes due to climate warming have been shown in many species of animals and plants (Colwell et al. 2008), including bryophytes of Europe (Frahm and Klaus 2001, Póes 2011, Bates and Preston 2011), but have rarely been shown for epiphyllous liverworts. A first possible case of northwards shift of epiphyllous bryophytes in Europe distribution was reported by Duckett (2008) who recorded extensive patches of three liverwort species on living leaves in a nature reserve in the vicinity of the city of London, UK at 51 °N.

Of the five epiphyllous species found in TNNR, four have been collected sporadically over the past 30 years in eastern China except for Cololejeunea japonica which was found only once in the past and no more until recently (Fig. 3, 4). Cololejeunea longifolia and C. spinosa have been collected since 1984 in Qimen County, Anhui Province. Cololejeunea raduliloba and Microlejeunea punctiformis have been collected since 1993 in Fengyangshan Nature Reserve, Zhejiang Province. Cololejeunea japonica has been collected since 1999 in Wuyishan Nature Reserve, Fujian Province. These sites were the northernmost occurrences of the five epiphyllous species in eastern China before. It is improbable that they had in the past been overlooked in TNNR, as Chinese epiphyllous liverworts have been intensively collected and studied by Zhu and So (2001), and bryophytes had already been inventoried in the reserve on a regular basis since 1981. We are very well-informed about the bryoflora of TNNR, where bryologists have collected and published their results for more than 30 years. Recent distribution data on epiphyllous bryophytes from elsewhere in China, such as Guan County in Sichuan Province (31°N) and Houhe Nature Reserve in Hubei Province (30.08°N) (Luo 1990, Peng et al. 2002), also suggest that the ranges of epiphyllous bryophytes in China may have shifted northwards there since 1964 (Chen and Wu 1964).

Since most epiphyllous liverworts are dependent on the environment created by vascular plants of moist, tropical and subtropical forests, the conservation of epiphyllous bryophytes is dependent on the strict protection of these forests (Zhu and So 2001). The Tianmushan National Nature Reserve was established in 1956 for protecting its forest ecosystem and is one of the first forest areas where logging was forbidden in China. The strict management conditions of TNNR are presumably beneficial to the establishment and growth of epiphyllous liverworts, but may also degrade the natural resources at the same time. By monitoring the native moso bamboo population dynamics in native Chinese fir and evergreen broadleaved forest bordering moso bamboo in TNNR for ten years, Bai et al. (2016) found that native moso bamboo may encroach adjacent natural forest gradually without human intervention and lead to the drastic disturbance of the surrounding natural forest. Such vegetation changes may alter forest floor microclimate with respect to light, temperature, and moisture (Liu et al. 2011). Microclimate factors, including temperature, relative humidity and light, are very important for epiphyllous distribution and growth. Slight changes in the local microclimate may alter the composition of the epiphyllous communities and result in the disappearance of species (Zhu and So 2001). The invasion by exotics or the replacement of the original canopy by planted trees often leads to the total loss of the epiphyllous flora and invasion of alien species in the understory of the rainforest can have a negative impact on the epiphyllous bryophyte communities.

In TNNR, the epiphyllous liverworts occur along the banks of a little shaded brook in the experimental area of the reserve (Fig. 1). In spite of intensive, repeated field searches, epiphyllous bryophytes were not found in the buffer zone and core zone of the reserve even though the latter area has been regarded as a key area for bryophyte diversity protection in TNNR (Wang et al. 2013). In a study of soil properties along the elevation gradient in TNNR, Yang et al. (2009) found that soil PH value decreases with increase in altitude, leading to the decline of the ancient Cryptomeria japonica var. sinensis trees. Presumably, the absence of epiphyllous bryophytes in the buffer zone and core zone of TNNR is due to the lack of microhabitats suitable for the growth of epiphyllous liverworts affected by acid deposition.

The future occurrence of the epiphyllous species detected in TNNR may not be guaranteed. As mentioned in the introduction, ecotourism in TNNR has strongly expanded in the past 20 years and has resulted in vegetation loss and shortage of water supply (Li 2004). Moreover, the epiphyllous liverworts occur exclusively in the experimental area of TNNR, which is less strictly protected than the buffer zone and core zone and is intensively used for forest ecology teaching (Fig. 2). These activities may threaten the continued occurrence of the epiphyllous species in TNNR. It is therefore recommended that measurements are taken for limitation of teaching, reduction of the number of trails and stricter conservation of the area where the species occur. The establishment in the area of a system for regular monitoring of water and air quality as well as quality of the environment, is also recommended.


We are grateful to the Tianmushan National Nature Reserve of Zhejiang, China. Special thanks are due to YanBin Jiang (Hubei) and Hong-Qing Li (Shanghai) for their valuable comments and suggestions in the earlier stage of the manuscript.

Funding — This research was supported by the National Natural Science Foundation of China (no. 31770371, 31300171) and the Special Program for the National Basic Work of the Ministry of Science and Technology, China (no. 2015FY110200).

Author contributions — X. Tang, X.-X. Zhou and S. R. Gradstein contributed equally to this article.



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© 2018 The Authors. This is an Open Access article This work is licensed under the terms of a Creative Commons Attribution 4.0 International License (CC-BY) < >. The license permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Xia Tang, S. Robbert Gradstein, Li-Wei Sun, Mao-Jie Zhu, Rui-Ping Shi, Qian-Qian Wei, Yu-Qi Chen, Xiao-Xu Zhou, and Jian Wang "A contribution to the knowledge of epiphyllous bryophytes in Tianmushan National Nature Reserve (Zhejiang, China), with remarks on climate warming and nature conservation," Lindbergia 41(1), (22 May 2018).
Accepted: 16 February 2018; Published: 22 May 2018
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