The character of the New Zealand land snail fauna and communities: some evolutionary and ecological perspectives

Barker, G. M.

doi:10.18195/issn.0313-122x.68.2005.053-102

Cited by 24 publications

(37 citation statements)

References 146 publications

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“…Cameron & Pokryszko, 2005). Inclusion of data from additional quantitative sampling at some sites, using litter from eight circular 0.086-m 2 frames, yielded estimates of plotlevel richness that did not differ (P > 0.05) from those obtained using the present sampling regime (Barker, 2005). Specimens were identified to species and the number of individuals of each species recorded.…”

Section: Community Samplingmentioning

confidence: 95%

“…In our results, snail local richness did show significant relationships with climatic, edaphic and vegetation factors, but this variation was not particularly strong. It is likely that local land snail richness would have been better explained if more site-specific measures of vegetation and disturbance had been available to the model, as demonstrated on a more local scale in New Zealand by Barker & Mayhill (1999), Wardle et al (2001) and Barker (2005Barker ( , 2006. 2).…”

Section: Patterns Of Diversitymentioning

confidence: 97%

“…Of the 80 or more land snail families known globally, only 11 are represented in New Zealand (Barker, 2005). The main islands span a range of latitudes from 35°to 47°S, and have a temperate to warm temperate climate with strong maritime, elevational and orographical influences.…”

Section: Study Area and Faunamentioning

confidence: 99%

“…The sampling methods (described by Barker, 2005) used a strategy developed from many years of experience in New Zealand land snail communities that are dominated by small litter-dwelling snails, and were similar to the widely accepted best practice for quantitative estimation of snail richness and composition (e.g. The sampling methods (described by Barker, 2005) used a strategy developed from many years of experience in New Zealand land snail communities that are dominated by small litter-dwelling snails, and were similar to the widely accepted best practice for quantitative estimation of snail richness and composition (e.g.…”

Section: Community Samplingmentioning

confidence: 99%

“…While diverse and often difficult to observe and identify to species, land snails have the advantage of being reasonably well described (Nekola, 2005) and thus form a useful invertebrate case study. The New Zealand land snail fauna is distinctive -exhibiting high endemism, high regional and local diversity, and a dominance of inconspicuous, detritivore species (Barker, 2005). The New Zealand land snail fauna is distinctive -exhibiting high endemism, high regional and local diversity, and a dominance of inconspicuous, detritivore species (Barker, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Estimating and conserving patterns of invertebrate diversity: a test case of New Zealand land snails

Overton¹,

Barker

Price

2009

Diversity and Distributions

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Aim Using New Zealand land snails as a case study, we evaluated recent spatial modelling approaches for the analysis of diversity in species-rich invertebrate groups. Applications and prospects for improved conservation assessment were investigated.Location New Zealand.Methods The study used a spatially extensive and taxonomically comprehensive, plot-based dataset on community structure in New Zealand land snails. Generalized regression analysis and spatial prediction (GRASP) was used to model and predict species richness as a function of environmental variables (including aspects of climate, soils and vegetation). Generalized dissimilarity modelling (GDM) was used to model turnover in species composition in relation to environmental and geographical distances, and to assess community similarity and the representativeness of the reserve network.Results Observed land snail richness in 20 · 20 m plots ranged from 1 to 74 (mean 17.5). The GRASP model explained a modest 27% of the variation in richness. The GDM model explained 57% of the variation in species turnover and indicated approximately equal amounts related to environmental (Cody's beta diversity) and geographical distance (Cody's gamma diversity). Temperature and moisture were the most important environmental variables. Results indicate that snail distributions are not only sorted by environment but are also strongly influenced by historical effects consistent with those expected of poorly dispersing taxa that have persisted in refugia during past climatic change. The GDM model enabled spatial classifications of snail communities, highlighting diverse communities in heterogeneous regions, such as the South Island mountains, and also enabled continuous depictions of community similarity and adequacy of New Zealand's protected natural areas network.Main conclusions The GRASP and GDM analyses allowed us to model and depict spatial patterns of diversity in land snail communities involving 845 species, and produce community classifications and estimates of community similarity. These tools advance conservation assessment in species-rich groups, but require further conceptual and methodological development.

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Section: Community Samplingmentioning

confidence: 95%

Section: Patterns Of Diversitymentioning

confidence: 97%

Section: Study Area and Faunamentioning

confidence: 99%

Section: Community Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Estimating and conserving patterns of invertebrate diversity: a test case of New Zealand land snails

Overton¹,

Barker

Price

2009

Diversity and Distributions

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Preliminary re-survey of the land snail fauna of Rotuma: conservation and biosecurity implications.

Brodie¹,

Barker²,

Stevens³

et al. 2014

Pac. Conserv. Biol.

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In May 2012 Rotuma Island, the main island of the remote Rotuma Group (Fiji), was surveyed to document the composition of the non-native land snail fauna and to investigate if populations of previously recorded native land snail species persist. From sampling at nine locations, twenty-one land snail species from eleven gastropod families were found. Of these, eight species are non-native and two of these Parmarion martensi Simroth, 1893 and Quantula striata (Gray, 1834) (Ariophantidae) are new records for the Rotuma Group. Ten of the 13 species of native land snails found — including the endemic partulid Partula leefi E. A. Smith, 1897 and the rhytidid Delos gardineri (E. A. Smith, 1897) — were detected only as empty shells. The native Ouagapia perryi (E. A. Smith, 1897) and the endemic Succinea rotumana E. A. Smith, 1897 and Sinployea rotumana (E. A. Smith, 1897) remain undetected on Rotuma Island since their first collection in 1897. The non-native, invasive predatory flatworm, Platydemus manokwari, was also found and represents a major threat to the island’s land snail fauna. This non-native species appears to be absent in many other parts of the Fiji Island archipelago and thus a re-evaluation of existing quarantine measures is required to address its potential spread to non-invaded areas. Comparisons with earlier surveys indicate a shift in the structure of the Rotuman land snail fauna over a 115-year period, with declining native components and increasing prevalence of non-native species. Further sampling, focusing on residual native habitat in less accessible areas such as coastal cliffs and offshore islets, is urgently needed to establish the conservation status of Rotuman native land snails and determine the threat posed by both, non-native snails and P. manokwari.

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Diversity and current conservation status of Melanesian–New Zealand placostyline land snails (Gastropoda : Bothriembryontidae), with discussion of conservation imperatives, priorities and methodology issues

Barker

Brodie

Bogitini

et al. 2016

Pac. Conserv. Biol.

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We review the diversity and conservation status of Placostylinae, land snails endemic to the western Pacific. Their narrow-range endemism, large size and associated vulnerability, consumptive exploitation by people, and habitat loss and degradation (inclusive of invasive predators) threaten their survival. There has been considerable attention from conservation biologists in New Caledonia, Lord Howe Island and New Zealand aimed at species recovery. Nonetheless, only on uninhabited, pest-free islands do these native snails persist in high numbers, and these remaining ‘sanctuaries’ are dependent on biosecurity vigilance. For other populations in New Caledonia, Lord Howe Island and New Zealand, the benefits of control of invasive mesopredators have been demonstrated, but it remains unclear if long-term persistence of Placostylinae can be achieved in degraded landscapes that continue to be subject to anthropogenic pressures. For species in Fiji, Vanuatu, and the Solomon Islands – the centre of Placostylinae diversity – their conservation status is not known with any certainty due to lack of basic data on range and population trends. Recent IUCN Red List assessments indicate a high level of extinction risk among Fijian species due to narrow geographic range coupled with decline in habitat extent and quality. Further inventory and ecological work is urgently needed in the Solomon Islands and Vanuatu to enable assessment of extinction risk and identify threatening processes. We identify four priority areas for advancing the conservation of Placostylinae, especially in Melanesia, and discuss the most pressing methodological issues. Molecular phylogenetic analyses are needed to provide an evolutionary framework for taxonomic revision and to underpin development of both conservation policy and species recovery plans.

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The character of the New Zealand land snail fauna and communities: some evolutionary and ecological perspectives

Cited by 24 publications

References 146 publications

Estimating and conserving patterns of invertebrate diversity: a test case of New Zealand land snails

Estimating and conserving patterns of invertebrate diversity: a test case of New Zealand land snails

Preliminary re-survey of the land snail fauna of Rotuma: conservation and biosecurity implications.

Diversity and current conservation status of Melanesian–New Zealand placostyline land snails (Gastropoda : Bothriembryontidae), with discussion of conservation imperatives, priorities and methodology issues

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