Land-Snail Diversity in a Square Kilometre of Cretan Maquis: Modest
Species Richness, High Density and Local Homogeneity

Cameron, R. A.; Mylonas, M.; Triantis, Kostas A.; Parmakelis, A.; Vardinoyannis, K.

doi:10.1093/mollus/69.2.93

Cited by 30 publications

(27 citation statements)

References 8 publications

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“…Sampling of wetland prairie terrestrial molluscs was limited to in situ hand searches, which can be inconsistent between multiple observers and may lead to the bias of conspicuous taxa depending on past experience with mollusc searching (Ward-Booth & Dussart, 2001). Instead of performing a timed one-time or periodic search on different patches of ground within a defined habitat common to mollusc diversity studies (Ports, 1996;Barker & Mayhill, 1999;Nekola, 1999;Schilthuizen & Rutjes, 2001, Cameron et al, 2003Kiss & Magnin, 2003), I used traps to repeatedly and frequently sample the same patch of ground within the study area over multiple years. Coverboards, 0.6 £ 0.6 m pieces of 1-cm thick plywood, were placed on the ground in the study site as traps to sample different regions of the prairie.…”

Section: Sampling the Mollusc Communitymentioning

confidence: 99%

Response Of A Terrestrial Mollusc Community To An Autumn Prescribed Burn In A Rare Wetland Prairie Of Western Oregon, USA

Severns

2005

Journal of Molluscan Studies

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Conservation and management of grasslands may involve the use of prescribed fire to reinstate a historical disturbance regime recently suppressed by humans. I used traps to describe the terrestrial mollusc community in a rare wetland prairie ecosystem of western Oregon, USA over a 3-year period in an adjacent burned and unburned wetland prairie parcel beginning 1 year following an autumn prescribed fire. Species richness was lower throughout the burned area for the duration of the study period and mollusc abundance was lower in the first postburn year, but steadily increased over time, surpassing the adjacent burned area by the third postburn year. According to Multi-response Permutation Procedure, the mollusc community in the adjacent burned area differed significantly from the unburned prairie each year since the burn, suggesting that fire history may structure the wetland prairie mollusc community. Indicator species analysis identified that Deroceras reticulatum and Monadenia fidelis were indicator species for unburned wetland prairie, while Catinella rhederi and Vertigo modesta were indicator species for burned habitat at the study site. Since fire appears to decrease wetland prairie mollusc diversity and abundance, prescribed burns should be conducted in accordance with refuges, to provide a source population for colonizing molluscs and for other animals with unknown responses to fire.

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Section: Sampling the Mollusc Communitymentioning

confidence: 99%

Response Of A Terrestrial Mollusc Community To An Autumn Prescribed Burn In A Rare Wetland Prairie Of Western Oregon, USA

Severns

2005

Journal of Molluscan Studies

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“…Generally, Mediterranean land snail communities are greatly diversified even within a province (Cameron et al. , 2000; Cameron et al. , 2003).…”

Section: Persistent Biogeographical Patternsmentioning

confidence: 99%

The role of landscape history and persistent biogeographical patterns in shaping the responses of Mediterranean land snail communities to recent fire disturbances

Kiss¹,

Magnin

Torre

2003

Journal of Biogeography

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Aims To assess the impact of various fire regimes over the past 30 years on land snail communities and to analyse the role of recent landscape history and the influence of biogeography in shaping the response patterns of gastropod communities following disturbances by fire. Location South‐eastern France (Provence) and Mediterranean region. Methods Stratified sampling within 12 sites was undertaken with regard to fire regime (i.e. number of fires, fire intervals and age of the last fire) occurring over the past 30 years. The study was complemented by a historical analysis using aerial photographs, old maps of vegetation cover and an analysis of the biogeographical composition of malacofaunas. Data were investigated using Correspondence Analysis and Sørensen coefficient of similarity. Results When a disturbance regime (land use or fire disturbances) has been maintained over decades or centuries, land snail communities appear highly modified and tend to be composed of only Mediterranean and xerophilous species. However, low fire regimes, since the 1970s, do not seem to greatly affect the composition of gastropod communities. Indeed, shade‐loving, mesophilous and European range species persist even after successive fires within some sites. In addition, the malacofaunas have a higher component of European range species with increasing distance from the Mediterranean sea. Main conclusions Analysis of the response patterns of gastropod communities to fire shows a response to numerous different factors. The composition of current land snail communities is not only the result of (more or less) recent patterns of fire regimes but also of anthropogenic disturbances, of landscape changes over the last centuries and of subsequent structure of the pre‐fire habitat, as well as of the influence of a biogeographical gradient. However, the response patterns observed and the persistence of pre‐fire communities imply the presence of cryptic refuges located within burned areas.

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“…, 2004; Hausdorf, 2006) make them excellent subjects for addressing how spatial patterns of species richness and diversity are produced (Cowie, 1995; Cowie et al. , 1995; Emberton, 1995; de Winter & Gittenberger, 1998; Barker & Mayhill, 1999; Cameron et al. , 2000, 2003; Schilthuizen & Rutjes, 2001).…”

Section: Introductionmentioning

confidence: 99%

Effects of habitat history and extinction selectivity on species‐richness patterns of an island land snail fauna

Chiba

Okochi

Ohbayashi

et al. 2009

Journal of Biogeography

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Aim Local-scale diversity patterns are not necessarily regulated by contemporary processes, but may be the result of historical events such as habitat changes and selective extinctions that occurred in the past. We test this hypothesis by examining species-richness patterns of the land snail fauna on an oceanic island where forest was once destroyed but subsequently recovered.Location Hahajima Island of the Ogasawara Islands in the western Pacific.Methods Species richness of land snails was examined in 217 0.25 · 0.25 km squares during 1990-91 and 2005-07. Associations of species richness with elevation, current habitat quality (proportion of habitat composed of indigenous trees and uncultivated areas), number of alien snail species, and proportion of forest loss before 1945 in each area were examined using a randomization test and simultaneous autoregressive (SAR) models. Extinctions in each area and on the entire island were detected by comparing 2005-07 records with 1990-91 records and previously published records from surveys in 1987-91 and 1901-07. The association of species extinction with snail ecotype and the above environmental factors was examined using a spatial generalized linear mixed model (GLMM). ResultsThe level of habitat loss before 1945 explained the greatest proportion of variation in the geographical patterns of species richness. Current species richness was positively correlated with elevation in the arboreal species, whereas it was negatively correlated with elevation in the ground-dwelling species. However, no or a positive correlation was found between elevation and richness of the grounddwelling species in 1987-91. The change of the association with elevation in the ground-dwelling species was caused by greater recent extinction at higher elevation, possibly as a result of predation by malacophagous flatworms. In contrast, very minor extinction levels have occurred in arboreal species since 1987-91, and their original patterns have remained unaltered, mainly because flatworms do not climb trees. Main conclusionsThe species-richness patterns of the land snails on Hahajima Island are mosaics shaped by extinction resulting from habitat loss more than 60 years ago, recent selective extinction, and original faunal patterns. The effects of habitat destruction have remained long after habitat recovery. Different factors have operated during different periods and at different time-scales. These findings suggest that historical processes should be taken into account when considering local-scale diversity patterns.

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Land-Snail Diversity in a Square Kilometre of Cretan Maquis: Modest Species Richness, High Density and Local Homogeneity

Cited by 30 publications

References 8 publications

Response Of A Terrestrial Mollusc Community To An Autumn Prescribed Burn In A Rare Wetland Prairie Of Western Oregon, USA

Response Of A Terrestrial Mollusc Community To An Autumn Prescribed Burn In A Rare Wetland Prairie Of Western Oregon, USA

The role of landscape history and persistent biogeographical patterns in shaping the responses of Mediterranean land snail communities to recent fire disturbances

Effects of habitat history and extinction selectivity on species‐richness patterns of an island land snail fauna

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