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Erinna newcombi Adams & Adams (Mollusca: Lymnaeidae): a Rediscovered Population in Hanakoa, Kaua'i, Hawai'i

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  • The National Tropical Botanical Garden

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Note: The front cover photograph and Figure 1 on page 53 of Volume No. 96 (in Records of the Hawaii Biological Survey for 2006—Part 2: Notes) represents the Hawaiian endemic Lymnaea aulacospira Ancey (Lymnaeidae) and not Erinna newcombi Adams & Adams (R.H. Cowie pers. comm. 2008; Hubendick 1952; Boynton & Wood 2007). The correct image representing the Hanakoa, Kaua‘i population of E. newcombi is included in an erratum published in 2008 (i.e., Erratum and further notes on Erinna newcombi [Mollusca: Lymnaeidae] in Hanakoa, Kaua`i, Hawai`i. Bishop Museum Occasional Papers 100: 54–55).
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Erinna newcombi Adams & Adams (Mollusca:Lymnaeidae):a
Rediscovered Population in Hanakoa,Kaua‘i,Hawai‘i
D. BOYNTON(Department of Education, P.O. Box 651, Waimea, Kaua‘i, Hawai‘i 96796, USA) &
K.R. WOOD (National Tropical Botanical Garden, 3530 Papalina Road, Kalaheo, Kaua‘i, Hawai‘i
96741, USA; email: kwood@ntbg.org)
Erinna newcombi Adams & Adams (Newcomb’ssnail) is endemic to the island of Kaua‘i
and is currently federally listed as threatened by the U.S. Fish and Wildlife Service
(USFWS). It occurs around freshwater springs where it apparently feeds on algae that
grow on submerged rocks. Recent field research indicates that the habitat preferences for
E. newcombi include fast-flowing perennial streams and their nearby springs, seeps, and
waterfalls (U.S. Fish and Wildlife Service 2004). At the time of publication of the draft
recovery plan for Newcomb’s snail (2004), its known range included very small riparian
sites found in Kalalau Stream, Lumaha‘i River, Hanalei River (4 subpopulations),
Waipahe‘e tributary of Keälia Stream, Makaleha Stream (2 subpopulations), and the north
fork of the Wailua River.
The USFWS Draft Recovery Plan for Erinna newcombi includes the primary goal of
establishing baseline population numbers for the species. In addition, the plan calls for
field research specifically within the historical ranges of Hanakoa, Wainiha, and Hana-
Records of the Hawaii Biological Survey for 2006—Part 2: Notes 61
BISHOP MUSEUM OCCASIONAL PAPERS: No. 96, 2007
62
Figure 1.Erinna newcombi in Hanakoa (Photo by D. Boynton).
Figure 2.Rediscovered population of Erinna newcombi in Hanakoa, Kaua‘i.
käpï‘ai to confirm if the snails are present or not. In order to help facilitate the USFWS in
its recovery efforts, we present the following data on our observations of E. newcombi,
which was historically recorded around the falls of Hanakoa on 16 Jul 1907 (Hawai‘i
Biodiversity & Mapping Program 2006) and most recently observed there by the authors
on 25 September 2006.
Lymnaeidae
Erinna newcombi Adams & Adams Rediscovered population
Seven individuals of E. newcombi were observed in Hanakoa Valley at the base of a water-
fall seep after turning only a few small algae-covered rocks, and they most likely occur in
much higher numbers. The site is on the margin of the falls and plunge pool, near the base
of the cliff face under wet rocks, fed by a continuous flow of spring water. Currently, the
falls are dominated by nonnative vegetation, including Ageratina riparia, Melinus minuti-
flora, Sacciolepis, Blechnum, Setaria palmifolia, Cyperus meyenianus, Bryophyllum pinna-
tum, and Pluchea carolinensis;native riparian elements include Kadua cookiana, K. elatior,
Plantago princeps var. longibracteata, Deparia cataracticola, Isachne pallens, Asplenium
unilaterale, Lipochaeta connata, Selaginella, Eragrostis variabilis, Carex meyenii, Mach-
aerina angustifolia, and Sphenomeris.The ecological components just below the falls are
dominated by nonnative invasive plant species of varying densities along the Hanakoa Falls
stream trail, including an overstory of kukui and mango, and an understory of common
guava, shampoo ginger, basketgrass, Christella dentata, and Arabian coffee. Other threats to
native species in this region include recent pig signs, abundant goats, Euglandina rosea,
marsh flies, and the American bullfrog (Rana catesbiana).
Material examined. KAUA‘I:Hä‘ena Distr, Hanakoa Valley west falls, end of main trail, seep-
ing vertical basalt with waterfall and plunge-pool, 340º aspect by east side of main running fall, 366
m[1,200 ft], 25 Sep 2006, K.R. Wood & D. Boynton 12171 (Photo voucher).
Literature Cited
Hawai‘i Biodiversity & Mapping Program.2006. Hawai‘i Biodiversity and Mapping
Program, Natural Diversity Database, Honolulu.
U.S.Fish & Wildlife Service.2004. Draft recovery plan for the Newcomb’s snail (Erinna
newcombi). U.S. Fish and Wildlife Service, Portland. 39 pp.
New records of alien Mollusca in the Hawaiian Islands:nonmarine snails
and slugs (Gastropoda) associated with the horticultural trade
KENNETH A. HAYES, CHUONG T. TRAN & ROBERT H. COWIE1(Center for Conservation Research and
Training, University of Hawai‘i, 3050 Maile Way, Gilmore 408, Honolulu, Hawai‘i 96822, USA;
email: khayes@hawaii.edu, cowie@hawaii.edu)
The nonmarine snails of the Hawaiian Islands have been cataloged by Cowie (1997),
reviewed by Cowie (1998a), and subsequent new records reported by Cowie (1998b, 1999,
2000). The horticultural industry has been implicated in the transport and introduction of
snails and slugs in various parts of the world (e.g., Robinson 1999; Barrientos 2000; Cowie
Records of the Hawaii Biological Survey for 2006—Part 2: Notes 63
1. Research Associate, Hawaii Biological Survey, Bishop Museum, 1525 Bernice Street, Honolulu, Hawai‘i 96817,
USA.
... Data for plant specimen vouchers are entered into the NTBG herbarium database. Plant names and authors follow Wagner et al. (1999)Boynton & Wood 2007; Wood 2008). Site 1 is found at the end of the main Hanakoa valley trail which follows Hanakoa streams northeastern branch, terminating at the western of the two falls at 328 m (1000 ft) elevation. ...
Technical Report
Full-text available
Erinna newcombi Adams & Adams (Newcomb’s snail) is a monotypic genus endemic to the island of Kaua`i and currently federally listed as threatened by the U. S. Fish and Wildlife Service (USFWS 2006; USFWS 2009). Populations occur around fresh water springs where they apparently feed on algae that grow on submerged rocks. Type collections were historically made in 1840 at Hanapepe falls, southwest Kaua`i (Hubendick 1952; HBMP 2011). Recent field research indicates that the habitat preferences for E. newcombi include fast-flowing mid-elevation perennial streams and their near-by springs, seeps and waterfalls (USFWS 2006; Boynton & Wood 2007; Wood 2008). At the time of publication for the USFWS recovery plan for Newcomb’s snail (2006), its known range included small riparian sites found in Kalalau Stream; Lumaha`i River; Hanalei River (four sub-populations); Waipahe`e tributary of Kealia Stream; Makaleha Stream (two sub-populations); and the north fork of the Wailua River, yet little quantitative data is available for these sites. According to the USFWS (2009), the Lumahai and lower Hanalei populations lack any documentation (i.e., no field notes, photographs or GPS locations), making continued studies of these reported sites improbable. Revisits to the north fork of the Wailua River and the upper Hanalei populations have also been disappointing, as no E. newcombi have been relocated (USFWS 2009). The Erinna newcombi recovery plan (USFWS 2006) notes that the only populations that have been observed in recent years have been the Kealia, Makaleha, and Kalalau stream sites, and there is significant uncertainty concerning the numbers of snails present at these sites. This paper presents biological data for nine recently monitored sub-populations of Erinna newcombi, seven of which were recently discovered and not included in the USFWS recovery plan (USFWS 2006). These sites occur within two separate valleys along Kaua`i’s northwestern Na Pali coast, namely Hanakoa [4 sub-populations] and Kalalau [5 sub-populations]) (Figures 1–3; Table 1).
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