Occurrence and morphological variability of Gyraulus crista (Gastropoda: Pulmonata: Planorbidae) on different types of substratum in woodland ponds

Spyra, Aneta; Strzelec, Małgorzata

doi:10.2478/s11756-013-0197-z

Cited by 7 publications

(5 citation statements)

References 24 publications

(23 reference statements)

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“…Gyraulus convexiusculus was found in all seasons in the upper reaches of Ichamati. A similar observation was reported on macroinvertebrates communities by Fisher & Williams (2006) and Spyra & Strzelec (2013) where Gyraulus sp. was found in all seasons.…”

Section: Discussionsupporting

confidence: 88%

<b>Community structure of benthic macroinvertebrate fauna of river Ichamati, India</b>

Basu¹,

Sarkar²,

Datta³

et al. 2018

J. Threat. Taxa

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Benthic macroinvertebrate communities are frequently applied as indicators of aquatic ecosystem health as many species are responsive to pollution and abrupt changes in their surroundings. The qualities of benthic invertebrate communities greatly depend on habitat conditions. Thus the diversity in benthic community varies with different habitat conditions. This investigation on the structure of the benthic invertebrate communities was conducted on river Ichamati, a trans-boundary river between India and Bangladesh to assess the cumulative effects of water quality on the aquatic biota. The study period extended from February 2011 to January 2014 at three sites from Majdiah to Hasanabad (in West Bengal, India) a stretch of 124km. A total of 23 macrobenthic species belonging to three phyla, five classes and nine orders were identified. Fifteen species of benthic invertebrates belonging to Mollusca, three species under Annelida and five species under Arthropoda were found. The highest abundance density (3633.33 indiv.m-2) and species richness (18 species) were recorded up-stream (Majdiah) where marginal habitats covered by macrophytes were significantly higher than at other sites. Both the organic carbon (4.41±1.11) and organic matter (7.48±1.56) of soil at this site were the maximum thus influencing the richness of benthic macroinvertebrate communities. Hydrological variables, viz, dissolved oxygen, pH, alkalinity; hardness, salinity, nutrients, calcium, and magnesium were studied to determine their influences on the benthic community in the upper, middle- and down-streams of the river, respectively. Shannon’s diversity index (0.95–2.07; 0.00–0.72; 0.00–0.64), dominance index (0.57–0.86; 0.00–0.44; 0.00–0.44), evenness index (0.72–0.95; 0.61–1.00; 0.00–1.00), Margalef index (0.72–2.23; 0.00–1.32; 0.00-0.28) of the upper, middle- and down-streams were calculated. Benthic macroinvertebrate density was correlated with hydrological variables which indicated that the abiotic factors had either direct or inverse influence on the richness and abundance; however, the abiotic factors did not correlate identically in all three sites.

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Section: Discussionsupporting

confidence: 88%

<b>Community structure of benthic macroinvertebrate fauna of river Ichamati, India</b>

Basu¹,

Sarkar²,

Datta³

et al. 2018

J. Threat. Taxa

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“…There are data on morphological differentiation of Radix auricularia (L., 1758) depending on wave-exposed habitats in open Baikal littoral or conventional habitats for this palaearctic snail (Stift et al 2004). Spyra and Strzelec (2013) showed a highly significant association of two subspecies of pulmonate Armiger crista (L., 1753) differing in shell sculpture with leaf deposits and Typha remains, while associations with different physicochemical properties of water were not revealed. Two ecotypes of marine Nucella lapillus living on different sites of Galician Atlantic shores (Spain) differ in some phenotypic characteristics; the shells of the exposed morph that lives outside estuaries are devoid of spiral cords, whereas the sheltered ecotype typically living inside estuaries has spiral cords on the shell (Rolán et al 2004).…”

Section: Shell Morphotypes and Habitatsmentioning

confidence: 82%

On morphological and ecological evidence of adaptive differentiation among stony cliff littoral Baikal gastropods

Sitnikova

Maximova

2015

Journal of Natural History

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Three morpho-or ecotypes ('ribbed', 'middle' or 'ribless' shell and 'smooth') of lithophilous Maackia herderiana (Lindholm, 1909) (Caenogastropoda: Baicaliidae) were investigated along the hydrodynamic zones of four locations on the southwestern littoral of Lake Baikal in southeast Siberia. We found a prevalence of the ribbedshell morphotype inhabiting stones at a depth of 1.2-2.0 m, corresponding to the hydrodynamic zone of strong wave activity, and a predominance of the smooth-shell morphotype living on cliffy canyons at 21-31 m depth in the hydrodynamic zone where wave action is very weak or totally absent. Mixed groups of snails with ribbed, ribless and/or smooth shells were present on stonyboulder substrates at 3 to 15-19 m depth of the wave-cut and wave-weakening hydrodynamic zones. Ribbed-morphotype snails living in inshore and wave-cut hydrodynamic zones had a smaller shell size than did smooth-morphotype snails inhabiting zones where wave activity was weak or totally absent. The thickness of ribbed shells in the non-ribbed areas was equal to the thickness of smooth shells; ribs enhance the thickness of the shell by 3-4 times, thereby increasing the strength of ribbed shells against destructive wave action. On the basis of the different correlation coefficients of shell weight, soft body mass and total mass with increasing shell height, we assumed a growth differentiation between the ribbed and smooth morphotypes. We compared our results with data on ecotypes of some freshwater and marine gastropods. ARTICLE HISTORY

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“…In some cases, however, the differences among them are being restricted to, for example, distinct patterns of the shell surface sculpture as it is observed in the planorbid snail Armiger crista (L., 1758) (Spyra and Strzelec 2013). In our case, we must deal with much greater external difference between morphotypes that corresponds to phenotypical distance observed between some 'true' species of lymnaeid snails or even exceeds it.…”

Section: Taxonomic Implications Of Obtained Resultsmentioning

confidence: 99%

“…Intraspecific morphotypes were discovered in diverse families of pulmonate snails, both aquatic (Plam et al 2008;Spyra and Strzelec 2013) and terrestrial (Gould 1968;Weigand et al 2012). In some cases, however, the differences among them are being restricted to, for example, distinct patterns of the shell surface sculpture as it is observed in the planorbid snail Armiger crista (L., 1758) (Spyra and Strzelec 2013).…”

Section: Taxonomic Implications Of Obtained Resultsmentioning

confidence: 99%

A comparative study of shell variation in two morphotypes of Lymnaea stagnalis (Mollusca: Gastropoda: Pulmonata)

Vinarski

2014

Zool. Stud.

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Background: Lymnaea stagnalis (L., 1758), the great pond snail, is among the most common and ubiquitous species of aquatic pulmonate gastropods of Palearctic. It is notorious for its enormous conchological variation, and many students tried to separate varieties, subspecies and even distinct species within the L. stagnalis s. l. Recent molecular studies have revealed that there are at least two genetically indistinguishable morphotypes of L. stagnalis in Palearctic that earlier were accepted by some authors as biological species under the binomial names L. stagnalis s. str. and L. fragilis (L., 1758). In this article, the comparative analysis of their conchological variation in a large physical geographical region (Western Siberia, Asiatic Russia) is provided.Results: The two morphotypes proved to be rather similar in their ecological preferences, but the patterns of their ontogenic, ecological, and geographical variation look rather distinct as well as the areas of their distribution in Western Siberia. U-shaped body size clines are reported in both morphotypes with the largest individuals tending to occur in the middle (forest-steppe) belt of Western Siberia. The causal analysis of the patterns of geographical variation in conchological traits of the great pond snail has identified the annual precipitation and the length of the growth season as the two main factors to shape the spatial clines in shell size and proportions. Among hydrological parameters, the water flow characteristics (lotic vs. lentic habitats) may influence shell morphology in the great pond snails though ecologically induced variation proved to be rather weak. The differences between populations living under different hydrological regimes may be captured by statistical techniques but are not enough to warrant separation of 'ecological' subspecies or other subspecific categories of ecophenotypic origin. Conclusions: Though there is no doubtless evidence of their specific independence, the two morphotypes, in a sense, 'behave' as two distinct entities with no identical ranges worthwhile to be recognized taxonomically. Their proper position in practical taxonomy should be discussed elsewhere.

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Occurrence and morphological variability of Gyraulus crista (Gastropoda: Pulmonata: Planorbidae) on different types of substratum in woodland ponds

Cited by 7 publications

References 24 publications

<b>Community structure of benthic macroinvertebrate fauna of river Ichamati, India</b>

<b>Community structure of benthic macroinvertebrate fauna of river Ichamati, India</b>

On morphological and ecological evidence of adaptive differentiation among stony cliff littoral Baikal gastropods

A comparative study of shell variation in two morphotypes of Lymnaea stagnalis (Mollusca: Gastropoda: Pulmonata)

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