Distribution, threats and conservation status ofthe Wayanad Mahseer, Neolissochilus wynaadensis (Day, 1873) (Teleostei:
Cyprinidae): an endemic large barb of the Western Ghats, India
Anvar Ali 1, Neelesh Dahanukar 2, Siby Philip3, K. Krishnakumar 4 & Rajeev Raghavan 5
1,3,4,5 Conservation Research Group (CRG), St.
Albert’s College, Kochi, Kerala 682018, India
2 Indian Institute of Science Education and
Research (IISER), Dr. Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
2,5 Systematics, Ecology & Conservation
Laboratory, Zoo Outreach Organization (ZOO), 96 Kumudham Nagar, Vilankurichi
Road, Coimbatore, Tamil Nadu 641035, India
3 Department of Zoology, Nirmalagiri College, Koothuparambu, Kannur, Kerala 670701,
India
5 MahseerTrust, c/o The Freshwater Biological Association, East Stoke River Laboratory,
Wareham, Dorset, BH20 6BB, United Kingdom
1 anvaraliif@gmail.com, 2 n.dahanukar@iiserpune.ac.in,3 philipsiby@gmail.com, 4 kkaqua@gmail.com, 5 rajeevraq@hotmail.com (corresponding author)
Abstract: The Wayanad Mahseer Neolissochilus
wynaadensis (Day, 1873) is an endemic cyprinid fish that occurs in the
upland streams and rivers of the southern region of the Western Ghats. This species has been listed as
‘Critically Endangered’ on the IUCN Red List of Threatened Species due to its
restricted distribution and heavy declines in populations. Like many large cyprinids of the Western
Ghats, N. wynaadensis is poorly known and documented, with very few
verified records and voucher specimens. Based on specimens recently collected from Wayanad, Kerala, the type
locality, as well as two additional locations in the Kodagu District of
Karnataka; we provide information on the current distribution, phylogenetic
position, threats and conservation. An updated conservation assessment of this species following the IUCN
Red List categories and criteria is also provided.
Keywords: Barbodes, Coorg, freshwater
fish, Vulnerable.
Abbreviations: BMNH - Natural History Museum, London;
CRG-SAC - Conservation Research Group, St. Albert’s College, Kochi; FMNH -
Field Museum, Chicago.
doi: http://dx.doi.org/10.11609/JoTT.o3901.5686-99 | ZooBank: urn:lsid:zoobank.org:pub:DB1F3C62-C246-4F9A-86E0-A1A863E4009E
Editor: Anjana Silva, Rajarata University of Sri Lanka, Saliyapura, Sri Lanka. Date
of publication: 26 May 2014 (online & print)
Manuscript details: Ms # o3901 | Received 02
January 2014 | Final received 19 April 2014 | Finally accepted 15 May 2014
Citation: Ali, A., N. Dahanukar,
S. Philip, K. Krishnakumar & R. Raghavan (2014). Distribution,
threats and conservation status of the Wayanad Mahseer, Neolissochilus
wynaadensis (Day, 1873) (Teleostei: Cyprinidae): an endemic large barb of
the Western Ghats, India. Journal of Threatened Taxa 6(5): 5686–5699; http://dx.doi.org/10.11609/JoTT.o3901.5686-99
Copyright: © Ali et al. 2014. Creative
Commons Attribution 4.0 International License. JoTT allows unrestricted
use of this article in any medium, reproduction and distribution by providing
adequate credit to the authors and the source of publication.
Funding: Rajeev Raghavan thanks the Mohammed Bin Zayed
Species Conservation Fund (MBZSCF; Project 1225670) and the North of England
Zoological Society (NEZS), Chester Zoo for funding the project on ‘Lost fishes
of the Western Ghats’. Neelesh Dahanukar is supported by the
Inspire Faculty Fellowship of the Department of Science and Technology (DST),
Government of India.
Competing Interest: The authors declare no competing
interests. Funders had no role in study design, collection, analysis and
interpretation of data and manuscript writing.
Author Contribution: AA, ND, SP, KK & RR carried out the field work and collected the
specimens; RR studied museum specimens; AA performed morphometry, ND carried
out the extraction of DNA and related molecular laboratory work; SP carried out
the phylogenetic analysis; AA, SP, ND & RR wrote the manuscript.
Acknowledgements: The
authors thank the president and members of the Coorg Wildlife Society (CWS),
Madikeri, especially P. Aiyappa (Shyam), for their excellent hospitality,
support and assistance during the field work in Kodagu; Jörg Freyhof, Toplitzin
Contreras MacBeath, Nikhil Sood, Roy Boppana, Baby Ganapathy, Naushad, Fibin
Baby, Keerthi Krutha and Sahila Kudalkar were excellent companions during various
phases of field work. Rajeev Raghavan thanks Ralf Britz for useful discussions,
and his help during visits to Natural History Museum (NHM), London; Leo Smith
and Kevin Swagel for images of the syntypes from Field Museum (FMNH), Chicago;
Steven Lockett and Mark Everard for helpful insights on the collection sites
and for sharing their images; Kevin Conway for relevant literature, and Rohan
Pethiyagoda and J.D. Marcus Knight for sharing information on the genus Neolissochilus.
For figures, images, tables -- click here
Introduction
The cyprinid genus, Neolissochilus Rainboth, 1985, comprises of 25
species of medium to large sized barbs, of which 22 are known to occur in
Southeast Asia (see Kottelat 2013) and seven in the Indian subcontinent (Table
1). They are important game fishes
in parts of South and Southeast Asia (Jhingran 1977; Khaironizam 2010) and are
also known to occur in the aquarium pet trade (Khaironizam 2010). Sixteen species of Neolissochilus have
been assessed for their conservation status, of which, two species have been
assessed as ‘Critically Endangered’, two as ‘Vulnerable’, three as ‘Near
Threatened’, four as ‘Least Concern’ and five as ‘Data Deficient’ (see Table 1;
and also species specific accounts on IUCN Red List of Threatened Species at
www.iucnredlist.org).
The Wayanad Mahseer, Neolissochilus wynaadensis (Day, 1873) is
one of two species within the genus that occurs in peninsular India; the other
being N. bovanicus, found in the Bhavani River. Day (1873; p528) described Barbus (Barbodes)wynaadensis, from Vythiri, Wayanad and reported it to be a common species
in the larger streams of the region, growing up to a length of 200 mm (also see
Day 1878, p 568; 1889, p 313). The
species was considered to be endemic to the streams in the Wayanad region of
Kerala, until Manimekalan (1998) and subsequently, Yazdani et al. (2001)
recorded it from Mudumalai, Tamil Nadu and Arunachalam et al. (2005) recorded
it from Abbey Falls near Madikeri, Kodagu, Karnataka.
Neolissochilus wynaadensis has been considered to
be a rare species with several surveys in and around the type locality, failing
to collect this species, and very few records available in the recent
ichthyological literature which are backed by voucher
specimens (see Abraham 2011). Due
to its restricted distribution and severe population declines (up to 80%) in
the last decade, N. wynaadensis has been listed as ‘Critically
Endangered’ in the IUCN Red List of Threatened Species (Abraham 2011).
As part of the on-going project on the ‘Lost fishes of Western Ghats’,
which aims to document the status and distribution of the region’s rarest
species (see Ali et al. 2013 a,b,c) we obtained
specimens of N. wynaadensis (Image 1 a,b,c) from its type locality
(Wayanad) as well as several locations in Kodagu District, Karnataka. This paper serves to document these
records, and discuss the current distribution, threats and conservation status
of this species. In the wake of
this new information, we also propose a revised Red List status for N.
wynaadensis.
Materials and Methods
Materials examined
Neolissochilus wynaadensis, CRG-SAC.2013.109-110,
07.x.2013, 2 ex., 126.45–139.83 mm SL, off the
road from Mukkodlu to Surlabi, Kodagu, 12.5010N & 75.7570E,
Cauvery River, Karnataka, India, coll. Raghavan et al.; Neolissochilus
wynaadensis, 08.x.2013, CRG-SAC.2013.111-112, 2 ex., 114.85–130.03 mm
SL, off the road from Bhagamandala to Napoklu, 12.3290N & 75.6590E,
Cauvery River, Karnataka, India, coll. R. Raghavan et al.; Neolissochilus
wynaadensis, CRG-SAC.2013.113-114, 11.x.2013, 2 ex., 83.97–84.48 mm
SL, Thirunelli, 11.9020N & 75.9980E, Kalindi Stream
of Kabini River, Wayanad, Kerala, India, coll. A. Ali & K. Krishnakumar.
Photographs: Barbus wynaadensis, F. Day, BMNH 1889.2.1.571, 1 ex, Vythiri, Wayanad, India; Barbus
wynaadensis, F. Day, FMNH 2318, 1 ex, Vythiri, Wayanad, India (both
paralectotypes) (Image 2 a,b).
Biometrics
Counts and measurements follow Pethiyagoda et al. (2008, 2012). Measurements were taken using a digital
calliper to the nearest 0.1mm. Subunits of body are presented as percent of standard length (SL) and
subunits of head are provided as percent of head length (HL) (see Table 2).
DNA isolation and molecular phylogeny
Fin clips were extracted from fresh specimens collected from three
different locations (one of which was from the type locality) in the Cauvery
drainage (see Table 3) and was preserved in absolute ethanol. Laboratory protocols for DNA isolation,
PCR amplification of co1 and cytb genes, and molecular phylogeny are similar to
those detailed in Ali et al. (2013a,c).
Results and Discussion
Taxonomy and generic status
Neolissochilus wynaadensis has been placed in
different genera, viz.: Barbus (Barbodes) (Day 1873, 1878, 1889), Barbus(Puntius) (Hora & Law 1941), Puntius (Tonapi & Mulherkar 1963;
Jayaram 1981; Manimekalan 1998), Neolissochilus (Rainboth 1985; Talwar
& Jhingran 1991; Devi et al. 1996; Pethiyagoda et al. 2012), and Barbodes(Wu 1977; Zhu 1995; Chen et al. 1999).
Our study shows that the correct generic allocation of the species is Neolissochilus(see Fig. 1) and not Barbodes s.s. (afterKottelat 2013) as mentioned in public databases like Catalog of Fishes
(Eschemeyer 2014) and FishBase (Froese & Pauly 2014). The N. wynaadensis sequences (co1
and cytb) formed a distinct clade closely related to other Neolissochilus species
such as N. hexagonolepis, N. hexastichus and N. stracheyi. The closest genus related to Neolissochilusis Tor (Fig. 1a,b). Endemic
large barbs of the Western Ghats (Hypselobarbus and Lepidopygopsis)
also formed a monophyletic group along with Tor and Neolissochilus.
Rainboth (1985) suggested the possibility of the presence of more than
one species of Neolissochilus per drainage based on the information
available from the eastern part (i.e., Southeast Asia) of its distribution.
However, our results on the biometrics as well as mitochondrial co1 and cytb
gene sequences of N. wynaadensis collected from Wayanad (type locality)
and two locations in Kodagu (=Coorg) are similar (see Table 2, 4 and Fig 1a,b)
and suggest that there is only one species within the upper Cauvery drainage
(Wayanad and Kodagu). The
morphometric characters of the fish analysed in the present paper, are also
consistent with those recorded by Arunachalam et al. (2005) from Abbey Falls. It is to be noted here that, similar to
other large barbs of Western Ghats (see Knight et al. 2013 a,b;
Ali et al. 2013 a,b), N. wynaadensis also has a wide range of lateral
line scale counts (26–29).
Currently, only two species of Neolissochilus are
known from peninsular India and the Western Ghats, N. bovanicus and N. wynaadensis. The following names, viz., Neolissochilus
tamiraparaniensis, N. acutirostris, N. microphthalmus, N. capudelphinus, N.
minimus and N. anamalaiensis, which are mentioned in some scientific
and non-scientific literature, are unavailable and represent ‘nomina nuda’ (for
details see Raghavan et al. 2013).
Distribution
Neolissochilus wynaadensis is endemic to the
Western Ghats of India (Dahanukar & Raghavan 2013). The species has a restricted
distribution (an area of occupancy of 1000km2) occurring in the east
flowing streams and rivers part of the larger Cauvery drainage, i.e., Kalindi
Stream of Kabini River in Thirunelli; Noolpuzha Stream of Kabini River inside
the Wayanad Wildlife Sanctuary, Kakkanhalla and Moyar tributaries inside the
Mudumalai Wildlife Sanctuary, as well as streams near Vythiri in Wayanad, and
Muvathoklu, Mukkodlu, Surlabi, Bhagamandala and Abbey falls in Kodagu (see
Image 3; Table 5). In Kodagu, N.
wynaadensis has also been recorded in Hamyala (Images 4, 5) and Kakkehole
(Steven Lockett, pers. comm. 2013). However, no voucher specimens are
available. The species is currently
known between the altitudinal range 400–1100 m.
The fact that the species has a very restricted distribution, and is
confined to only a few tributaries/streams in its range is additionally evident
from the studies of Johnson & Arunachalam (2009) (studies conducted in
2001–2002) where they did not record N. wynaadensis from two
tributaries (Thalipuzha and Bavalipuzha) of the east flowing Cauvery in Wayanad
District.
Abraham (2011), mentions that the fish also
occurs in the Chooralmala and Kanthampara areas in Wayanad (part of the west
flowing Chaliyar River system), without providing any reference. The author also mentions (a personal
communication; see http://www.iucnredlist.org/details/172429/0) that the species
occurs in the Periya Forest Range near Mananthavady, Wyanad. It is to be noted that, in a
comprehensive study of the fishes of Nilgiri Biosphere Reserve including parts
of Wayanad and upper reaches of Chaliyar (Easa & Basha 1995; Easa & Shaji
1997), not a single specimen of N. wynaadensis was collected from
Chooralmala and Kanthampara (see Easa & Basha 1995; Table 10; p 29),
suggesting that the species could be restricted to only the east flowing
drainages (Easa & Shaji 1997). Therefore, in the absence of any references to the records, and actual
voucher specimens, it is premature to conclude that N. wynaadensisoccurs in the west flowing drainages as suggested by Abraham (2011).
Arunachalam et al. (2005) mentioned that N. wynaadensis occurs in
Vattapoil in Wayanad District by citing Gopi (2000). This record may however be based on the
personal examination of voucher specimens (ZSI/WRS Calicut 6868) collected from
this location, rather than as mentioned by Gopi (2000). This is because, Gopi (2000), in his
review on the fishes of Kerala, does not mention such a location and only
records this species from Thirunelli and Vythiri (see p 62 and 71).
Abraham (2011) mentions about a record of N. wynaadensis from
Bhadra River, citing Shahnawaz et al. (2009 sic) (note that the correct
year should have been 2010). However a perusal of the original paper by Shahnawaz et al. (2010)
reveals no such record. Similarly, although Pillai (1929) and Hora & Law
(1941) recorded Barbus wynaadensis from Travancore in southern Kerala,
it is highly unlikely that the species occurs in the region. The record by Pillai
(1929) from Tenmalai was also doubted by Menon (2004). In all probability, the specimen
misidentified as Barbus wynaadensis from Travancore could be the fish
currently known as ‘Barbodes’ carnaticus.
Neolissochilus wynaadensis was reported from Mula-Mutha River of Pune by Tonapi & Mulherkar (1963). However,
this record was doubted by Kharat et al. (2001, p 47). Similarly, the records of N. wynaadensisfrom China (Wu 1964, cited in Talwar & Jhingran 1991), especially from the
Yunnan region (Wu 1977, cited in Chen et al. 1999; Yang & Chen 1994; Jing
et al. 2013; also see cytb sequence KC696524 in GenBank) are ‘at best’
misidentifications, and may in all probability be N. hexagonolepis, N.
stracheyi (see Fig 1) or an undescribed species similar to it. The examination of the specimen,
KIZ8110101 (see Yang & Chen 1994) at the Kunming Institute of Zoology,
China will help clear the exact identity of the ‘Barbodes wynaadensis’recorded from the rivers in Yunnan.
Further studies are, however, required to understand the diversity of
this genus especially from the southern regions of the Western Ghats from where
many ‘nomina nuda’ under the genus Neolissochilus (see Raghavan et al.
2013) as well as previous records (Pillai 1929; Hora & Law 1941) of N.
wynaadensis are available. There is specifically a need to examine
specimens identified and catalogued in various museums, as Torspecies/Mahseer from various regions south of the Palakkad Gap.
Population status
Neolissochilus wynaadensis has been considered to
be a very rare species (Gopi 2000; Easa & Shaji 1997), as it was not
recorded in many collections from Wayanad during 1999–2004 and in 2008
(Abraham 2011). Although not backed
by any scientific data, global populations of this species were considered to
have reduced by 80% during 2000–2010, and are still declining (See
Abraham 2011).
Our field surveys in Thirunelli in April 2004 (Unpublished), and recently
in October 2013 (vouchers mentioned in the present paper) led to the collection
of only three specimens, while those in Vythiri in April 2004 did not yield
any. Nevertheless, there are fairly good populations in Kodagu District of Karnataka State
as evident from large shoals inhabiting the streams and rivers where
they were occur. A large group
(probably in hundreds) of N. wynaadensis were seen in a single splash
pool near Muvathoklu where they are protected in a sacred grove (Devarkaadu).
Habitat and Ecology
Neolissochilus wynaadensis prefers fast flowing
upland streams and rivers where they occur in both rocky pools (Abraham 2011)
as well as riffles (Kurup et al. 2004). The pool-riffle habitats have a moderate flow velocity and provide good
hiding places for the species. These habitats are also frequented by riffle beetles and
chironomids that form the major food for N. wynaadensis (Manojkumar
& Kurup 2002). Kurup et al.
(2004) provides information on several microhabitat variables in the locations
frequented by N. wynaadensis. Habitats in the sites from where N. wynaadensis was recorded in
the present study are shown in Images 6, 7 and 8. It has also been suggested that N.
wynaadensis are long range migrants that travel to
the upper reaches of rivers for spawning (Menon 2004).
Phylogenetic position
The Neolissochilus from peninsular India (N. wynaadensis)
forms a monophyletic grouping with other Neolissochilus species from
northeastern India and Southeast Asia (Fig 1a,b). Also, the specimens of Neolissochilusfound in various locations in Kodagu (=Coorg, in Bhagamandala and Mukkodlu),
were genetically similar to those that occur in the type locality of the
species (i.e., Wayanad) (also see Table 4). The discontinuous distribution of the
genus Neolissochilus (Sundaland, Indo Burma, Eastern Himalaya and
Western Ghats) could also form the basis for interesting biogeographic
hypothesis testing; for instance, to check the
scenario of ‘true disjuncts’ (see Dahanukar et al. 2013 and references therein). On the other hand, detailed anatomical
and morphological analysis is needed to ascertain if the Western Ghats
representatives of the genus are ‘false disjuncts’ and need a separate generic
allocation. Such biogeographic and
evolutionary questions should however be validated with larger multi-locus
datasets.
Threats and conservation
Anthropogenic threats including habitat destruction as well as pollution
caused by the discharge of fertilizers, pesticides and other chemical effluents
from surrounding plantations and sand mining have been reported from the
habitats frequented by the species (Abraham 2011). There is no data to show that this
species is being exploited as a food fish (Abraham 2011), but given its size,
it is likely to be harvested by local communities. Overall, there is a need for greater
understanding of the specific threats, their intensity and the impacts they
have on the survival of the species.
Much of the known range of N. wynaadensis is outside protected
areas. Currently, Wayanad Wildlife
Sanctuary in Kerala and Mudumalai Wildlife Sanctuary in Tamil Nadu are the only
protected areas where the species occur. However, an alternate protected area system in the form of sacred groves, (Devarkaadu) exists in Kodagu, Karnataka. Streams flowing
through these sacred groves harbour good populations of N. wynaadensis whichare protected (for e.g., in Mukkodlu, Muvathoklu and Surlabi regions) by the
local communities.
Currently, N. wynaadensis has been listed as ‘Critically
Endangered’ (Abraham 2011) in the IUCN Red List of Threatened Species. Additional information on distribution
and threats as documented in the present paper has led to a scenario where the
conservation status of the species needs to be revised. The proposed Red List
Status of the species has been provided in Appendix 1.
Conclusions
Large cyprinids of the genus Tor, Neolissochilus, Hypselobarbusand ‘Barbodes’ comprise one of the most poorly known freshwater fishes
of the Western Ghats, with very little information available on their diversity
(both generic and specific) and distribution. Recent studies have helped to improve
our knowledge on some genera (for e.g., Hypselobarbus) (see Ali et al.
2013a,b; Knight et al. 2013a,b,c), while others (Tor,
Neolissochilus and Barbodes) remain understudied. Future research should be directed on
these large barbs to understand in detail their taxonomy, diversity,
distribution, population dynamics and stock structure and conservation. There is particularly a need to
understand the identity of the barb described by Day (1877) as Barbus
bovanicus, from the Bhavani River in the southern Western Ghats, which is
currently considered to be a species of Neolissochilus (see Pethiyagoda
et al. 2012).
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