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Molluscan associations with the Clausiliid Alinda biplicata (Montagu, 1803) (Gastropoda: Pulmonata: Clausiliidae) in floodplain forests at the north-eastern edge of its range

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Sulikowska-Drozd A., Kappes H.

Folia Malacologica

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2014

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tom 22

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nr 1

We quantified the mollusc assemblage composition in eight riverine forests inhabited by the door snail Alinda biplicata (Montagu) in Central Poland where it occurs at the north-eastern border of its distribution range. In each location, eight random 0.25 m2 plots were quantitatively sampled from a 400 m2 core area that was searched for additional species. A total of 54 species were found, composed of 46 terrestrial snails and slugs, six freshwater gastropod and two clam species. Abundances ranged from 220 to 4,400 ind.m–2 per location, with a maximum of 2,200 individuals per plot. The number of taxa ranged from 17 to 34 per location and from 3 to 23 per plot. A. biplicata occurred in each randomly sampled plot. The highest number of co-occurrences with Alinda was found for Carychium tridentatum and Nesovitrea hammonis. Additionally, forest-specific, wetland-specific and even dry habitat-specific snails can use the same patch of microhabitat. The lack of narrow ecological specialisation in A. biplicata may favour its presence in man-made habitats where it is sometimes considered an invasive native gastropod. The species list included invasive Arion vulgaris and some other species with a mainly West European distribution, such as Oxychilus draparnaudi, O. alliarius, Arion rufus, Cepaea nemoralis and C. hortensis. The eastern borders of the native ranges of these species reach into the western part of Poland but in the sampled region they seem to be recent arrivals. Our results indicate that “western” (Atlantic) faunal elements benefit from more balanced microclimate in wet floodplain forests, which possibly reduces macroclimatic constraints at their distribution border.

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Heterogeneity of mollusc communities between and within forest fragments in a much modified floodplain landscape

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Kappes H., Sulikowska-Drozd A.

Folia Malacologica

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2016

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tom 24

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nr 1

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Influence of habitat structure and conditions in floodplain forests on mollusc assemblages

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Kappes H., Kopec D., Sulikowska-Drozd A.

Polish Journal of Ecology

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2014

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tom 62

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nr 4

Alder floodplain forests are a rare and threatened forest type in Europe. These forests can be very rich in mollusc species. The intermediate disturbance hypothesis predicts that species richness should peak at intermediate inundation frequency, that is, at intermediate elevation above the river level. We additionally hypothesized that constantly high soil moisture can distort the usually positive correlation between the amounts of downed deadwood and snail richness, and that tree stems might be more favourable than deadwood because their vertical structure provides a better refuge during inundation events. To this end, we sampled molluscs from a core area of 20 × 20 m from eight alluvial forests with black alder in the surroundings of Łódź, Central Poland. In each core area, substrate was collected from eight random plots (0.25 m² each). We also recorded soil pH, vascular plant species and mosses diversity, along with other structural variables. Plant indicator values were calculated according to Ellenberg. Soil quality (amongst others: soil pH, reactivity value, nutrient and moisture availability) decreased with increasing elevation above the river level. In the plot samples, we found a total of 18,497 individuals from 52 species. Mollusc species richness dropped stronger than densities with an increasing elevation above the river level. Main influences on mollusc richness and abundance originated from positive correlations with soil pH and moisture. An additional hand sampling campaign on tree stems and deadwood items in the core area revealed that coarse woody debris items on average carried twice as many individuals as did tree stems. Deadwood and tree stems supported similar numbers of snail species per item, but beta-diversity was higher on deadwood. Consequently, Jackknife 2 predicted that deadwood is utilized by about 46 species, whereas tree stems only support about 39 species. Our results indicate (1) that mollusc richness peaks at low elevations above normal water level in this type of forest, (2) that intact hydrological regimes are associated with high soil quality and mollusc biodiversity, and (3) suggest that coarse woody debris adds resources, refuges and a dispersal agent for the alder forest floor fauna.

Ograniczanie wyników

2 Folia Malacologica

1 Polish Journal of Ecology

3 Kappes H.

3 Sulikowska-Drozd A.

1 Kopec D.

1 2016

2 2014

Molluscan associations with the Clausiliid Alinda biplicata (Montagu, 1803) (Gastropoda: Pulmonata: Clausiliidae) in floodplain forests at the north-eastern edge of its range

Heterogeneity of mollusc communities between and within forest fragments in a much modified floodplain landscape

Influence of habitat structure and conditions in floodplain forests on mollusc assemblages