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Comparison of sizes of fi ve-whorled P. planorbis shells from different habitats in Western Siberia (see Fig. 1). A conventional names and geographic latitude of habitats are given. Five largest shells at 5.0 whorls from a given sample are illustrated. Scale bar 2 mm.
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Citations
... Littorinoidea Children, 1834Pomatiidae Newton, 1891(1828 Pomatias Studer, 1789 Pomatias elegans (Müller, 1774) ( Fig. 1. L-N Quaternary fossils (Giusti et al., 1995;Fenech et al., 2020) indicate that this conchologically variable species (see Vinarski & Karimov, 2008) was originally autochthonous, while archaeological evidence (Baldacchino, 1937) and a 19th century presence in anthropogenic habitats (in Caruana et al., 1867, Issel, 1868bFeilden, 1879) imply that it may have been reintroduced to the islands a number of times. No extant populations are known (Schembri, 1992;Mienis, 1993 Paropeas Pilsbry, 1906 Paropeas achatinaceum (L. ...
The first record in Malta, and the second record in Europe, of the tropical terrestrial gastropod Paropeas achatinaceum (L. Pfeiffer, 1846) is presented, with an annotated bibliography of the allochthonous (and non-marine) gastropod fauna hitherto recorded from the Maltese archipelago.
... Planorbis planorbis, with its wide distribution, is, probably, the most eurythermic species of all discussed in this paper. Its collection from northern latitudes of Europe and Western Siberia are known [54][55][56] and, thus, the performance of this snail as a climate change indicator is very low. We can assume that Monodacna and Planorbis lived in the Upper Amur River Basin, probably during the Karginsky and Kazantsevsky interglacials of the late Pleistocene and were extirpated there during the Murukta or Sartan glaciation. ...
Data on the historical change of the Transbaikalian malacofauna in the Neopleistocene and Holocene is presented. Aquatic mollusc shells from archaeological excavations of the ancient settlements dating from the Neolithic period to Medieval and also from a drill hole of the Neopleistocene alluvial deposits were collected. In total eight species of bivalve molluscs from the families Margaritiferidae, Unionidae, Lymnocardiidae, Glycymerididae [marine], and two gastropod species from families Viviparidae and Planorbidae were identified. These species were aged using radiocarbon dating. It was found that the species ranged in age from more than 50.000 to 2.080-1.210 years BP. Five species inhabited the Transbaikal region which are locally extirpated today. Their disjunctive ranges in the past included southern Europe and Western and Eastern Siberia to Transbaikalia and in the east to Far East and Primorye Territory of Russia. A remarkable finding is that of the bivalve genus Monodacna, which was found very far from its native range, the Ponto-Caspian region. The time of existence and extirpation of the thermophilic species of genera Mono-dacna, Planorbis, Lanceolaria and Amuropaludina corresponds to cycles of the warming and cooling in Pleistocene and Holocene according to regional climate chronological scales. These species can be used as palaeoclimate indicators. Change of the regional malacofau-nal species composition is connected with the natural climatochron cycles in the Pleistocene and Holocene resulting in evidence for succession. In the course of this succession, these stenothermal species became extirpated on a regional level, decreasing their global ranges.
... An individual P. corneus with shell diameter of 20.3mm was observed with a predicted body weight of 1.5 gm. The shell features bear similar correlations as observed for other planorbid [29,30,26] and non-planorbid gastropods [24,31,25]. The fecundity of P. corneus vary with the temperature with numbers of eggs per egg capsule varying between 8 and 14.8 and the maximum number of eggs per egg capsule between 27 and 48 [19,20]. ...
An assessment of the shell morphology and the fecundity of the 'great ramshorn snail', Planorbarius corneus (Linnaeus, 1758) (Gastropoda: Planorbidae) obtained from pet market in Kolkata, India was carried out. Using various dimensions of the shell, including shell diameter, and body weight of the living specimens (n=204) and shell weight for dead specimens (n= 306), the correlations and regression equations were framed to portray the shell shape of P. corneus. A relationship between fecundity with the shell diameter was also deduced to highlight the reproductive potential of P. corneus. In the living specimens, the shell diameter (x) and the body weight (y) fitted with a power regression y = 0.396x 2.74 , R² = 0.987. Similar observation was made for the dead specimens, where the shell diameter (x) and the shell weight (y) were related as: y = 0.067x 2.99 , R² = 0.973. All the dimensions of the shell were highly correlated (P < 0.0001) and could be related through regression equations. A positive correlation was observed between fecundity and shell diameter but with a low fit to a linear regression equation, indicating sufficient variability in the fecundity for a particular size of P. corneus. In continuation with these observations, further studies on P. corneus are required to deduce its possible effects as an invasive freshwater species in Indian context.
... Многообразие форм и аспектов изменчивости пресноводных Pulmonata определило структуру монографии, в которой обобщены как данные многочисленных литературных источников, посвященных проблеме изменчивости Lymnaeiformes, так и результаты собственных исследований автора, которые частью уже опубликованы (Винарский, Андреев, 2003;Винарский и др., 2007;Vinarski, Karimov, 2008;Vinarski, Vodyanitskaja, 2008;Vinarski, 2009Vinarski, , 2012Винарский, 2012; и др.), а частью впервые публикуются здесь. В большинстве случаев мате- риалом для работы послужили выборки легочных моллюсков, взятые автором из природных популяций, населяющих водоемы Урала и Запад- ной Сибири. ...
The book is devoted to the complex analysis of variability in taxonomically
significant characters of freshwater pulmonate snails (Mollusca:
Gastropoda: Pulmonata). Variability of shell, genital organs, genetic and
chromosome characters is discussed on the original author’s data accompanied
by an extensive review of the malacological literature. The variability
of freshwater Pulmonata is studied in different aspects relevant to taxonomy:
ontogenic, ecophenotypic, geographic, and teratologic. Some metodological
problems of using of data on variability in the practical molluscan taxonomy
are discussed. A brief historical outline of development of the concept of
variability in the zoological systematics is given alongside with an essay on
the history of studies of variability in freshwater molluscs.
The monograph is addressed to zoologists, hydrobiologists, taxonomists,
university lecturers, undergraduate and post-graduate students.
Bibliography – 652 entries, 65 figures and 39 tables in text
... In general, shell size decreases in mollusks that inhabit northern areas comm pared to southern populations, and this parameter decreases gradually in the northern direction, as was first found by Wilhelm Kobelt (1871) more than 140 years ago while studying the great pond snail Lym naea stagnalis, even though no statistics was applied. Statistically, the decrease in shell size with regard to the geographical latitude was later found for both bivalves (Alimov, 1981) and gastropods (Vinarski et al., 2007; Vinarski and Karimov, 2008). In particular, the average shell size in three pulmonate gastropod moll lusk species that inhabit western Siberia significantly decreases for populations found in northern areas (Fig. 1;Table 1). ...
... Turgai Omsk Laskino Taksika Vylposl shells of the mollusks sampled in southern water bodd ies, but northern shells are significantly smaller (Vinarski and Karimov, 2008). The coefficients of variation of the shell morpholl ogy of L. stagnalis decrease from the south to north (Terent'ev, 1970a). ...
A tremendous number of publications concern the ecological and biogeographical studies of geographical variability of the animal species. The phenomenon of geographical variability is found in nearly all large taxa. The study of this ecological issue is important in devell oping a theory of evolution, systematics, ecology, and population genetics (Lukin, 1940; Mayr, 1968; Gall and Popov, 1998; Gaston and Blackburn, 2000). The geoo graphical variability is observed for the morphological parameters and includes physiological and behavioral features, such as fecundity, mortality, growth rate, and maturation rate (Lukin, 1940; Mina and Klevezal, 1976; Lonsdale and Jonasdottir, 1990; Derocher and Stirling, 1998; Parmentier et al., 2005; Morley et al., 2009). Terrestrial vertebrates, especially birds and mamm mals, are the most studied group in regard to the probb lem of geographical variability. The empirical rules for geographical variability were articulated in the first part of the 19th century. These rules include soocalled ecogeographical rules, such as Gloger's rule and Bergg mann's rule (Lukin, 1940). However, the amount of data on the geographical variability in invertebrates, including mollusks, is insignificant compared to the data set that exists for vertebrates. Moreover, the numm bers from studies performed for different groups of mollusks are highly variable. Terrestrial gastropods are probably the most studied of all mollusks, since the ecogeographical rules for this group were articulated in
... Размеры и пропорции раковин пресноводных легочных моллюсков подвер жены также географической изменчивости. Так, размеры раковин всех изучен ных в этом отношении видов в Западной Сибири уменьшаются в направлении с юга на север (Винарский и др., 2007;Vinarski, Karimov, 2008). В том же на правлении изменяются и значения большинства диагностически значимых конхологических индексов (Винарский, 2003). ...
The book is devoted to description of the fauna of freshwater snails of the family
Lymnaeidae Rafinesque, 1815 inhabiting water bodies of the Ural mountains and
adjacent regions. Species of this family have a broad geographic distribution and are
of great medical significance playing an important role in transmission of trematode
larvae.
Though malacological investigations in the Ural region have a long history (from
the middle of XIX century up to now), complete taxonomic and faunistic survey of
the Uralian lymnaeids has never been published. This edition is a first attempt to
realize such a survey. The aim of our research team is threefold: 1) to review all
known by now literature sources on Uralian lymnaeids along with the examination
of largest malacological collections of Russia, where lymnaeids of Uralian region are
kept; 2) to provide all persons interested in Uralian malacofauna (parasitologists,
hybrobiologists, paleontologists and non�professional nature watchers) with a
comprehensive and complete handbook dealing with Lymnaeidae that is known to
be one of the most diverse and abundant families of freshwater pulmonates; 3) to
investigate geographical distribution of each lymnaeids species in the Uralian
region and to chart all known by now localities of all species. The present part of the
edition is devoted to the systematic survey of the Uralian Lymnaeidae.
The primary material for the study was collected in the Uralian waterbodies
during 1954–2009 by the authors. It is housed in the Zoological Institute RAS
(Sankt�Petersburg), Zoological Museum of the Institute of Plant & Animal Ecology
Ural Branch RAS (Ekaterinburg) and the Museum of Siberian Aquatic Mollusks
(Omsk State Pedagogical University). Besides, the largest of Russian malacological
collections — that of the Zoological Institute of RAS was used. The samples of
Uralian freshwater snails of the latter have been accumulated since 1840s, when
A.Th. von Middendorff executed his famous research trip to Siberia (Middendorff,
1851). The taxonomical basis of the study is the system of Lymnaeidae developed
by N.D. Kruglov & Ya.I. Starobogatov (1993a, 6; Kruglov, 2005) with certain
corrections and additions according to most recent papers by both Russian and
Western European taxonomists.
Those species were included only in the final list, which existence in the Uralian
waterbodies was confirmed by examination of available museum collections. All
literature sources dealing with distribution of lymnaeids in the Uralian region were exposed to critical examination, especially those that contain neither shell
descriptions nor shell pictures.
Totally, we have examined more than 18 000 specimens of lymnaeids and
revealed in sum 32 species of the family inhabiting the region under consideration.
These species belong to two genera: Lymnaea Lamarck, 1799 (29 species) and
Aenigmomphiscola Kruglov et Starobogatov, 1981 (3 species). Another three species
(Lymnaea jacutica, L. juribeica, L. obensis) are recorded in waterbodies of the Gydan
Peninsula or Lower Ob’ Basin and, thus, will likely be found in future within the
boundaries of the Uralian region.
The book comprises two parts. In the general part, an information on external
and internal morphology of lymnaeids is given along with the data on materials and
methods used in this study.
In sum, 35 lymnaeid species are described in the special part of our book
following to the same scheme: Latin and Russian (if exist) names, list of main
synonyms, data on the type locality, description of the shell and diagnostic features
of reproductive system, data on general (at worldwide scale) and regional
distribution, bionomics and – last but not least — diagnostic and nomenclature
remarks. Dichotomous keys for determination of genera, subgenera and species of
Lymnaeidae of the Urals are given.
The second part of the book will contain data and maps of lymnaeid species’
distribution in the Urals and adjacent region as well as an outline of the history of
study of the Uralian lymnaeid snails.
... I am inclined to consider a latitudinal cline in the sizes of stagnicoline copulative organs as a by-product of geographical variability in the body size of molluscs. In Siberia, solute body sizes of most pulmonates decline signifi cantly in the north direction (VINARSKI et al. 2007; VINARSKI & KARIMOV 2008), and it is probable to suggest that size of male genitalia may reduce proportionally to the body size reduction. The correlation analyses revealed a weak but signifi cant positive relationship between sizes of shells and copulative organs in both L. saridalensis and L. terebra (Figs. ...
... 3–4). The possible causes of latitudinal variability in body sizes of pulmonates are discussed elsewhere (VINARSKI et al. 2007; VINARSKI & KARIMOV 2008). The " lock-and-key " hypothesis predicts that size of genitals ought not to be correlated with body size and therefore it should be ruled out here as not corresponding to the facts. ...
The geographical variability of the genital structure in freshwater pulmonates is still very poorly studied though the anatomical characters are of great importance for taxonomy. The spatial changes in the size and proportions of the copulative apparatuses in two lymnaeid species, Lymnaea (Stagnicola) saridalensis Mozley, 1934 and L. (S.) terebra (Westerlund, 1885), living in Siberia, were investigated. The two species studied demonstrate fair distinct patterns of the geographical variation of their male genitals. There is a signifi cant negative correlation between the total length of the copulative organ and geographical latitude in L. terebra that is resulted in alteration of the so-called ‘index of the copulative apparatus’ (ICA) in the north direction. The length of the penis sheath in L. saridalensis is negatively correlated with latitude as well, although a signifi cant geographical variation of the ICA values is not detected. Most probably, a signifi cant diminution of the copulative apparatus size in the north direction is mere a by-product of the body size decline of molluscs in the same direction uncovered previously (VINARSKI et al. 2007; VINARSKI & KARIMOV 2008)
In reservoirs and watercourses of the Upper Ob basin (south of Western Siberia) two representatives of the family Valvatidae (Valvatidae) of the subgenus Sibirovalvata, having a planispiral shell, have been noted. It is shown that two species of planispiral mollusks from this subgenus live in the region: Valvata (Sibirovalvata) frigida and V. (S.) sibirica. On the material from the Upper Ob basin, significant conchological differences between V. (S.) frigida and V. (S.) sibirica by key morphometric indices. According to the results of comparison with the material from the north of Western Siberia, it was found that the shells of the northern (basin of the Taz River) and southern (basin of the Upper Ob) populations of V. (S.) frigida and V. (S.) sibirica differ very slightly in morphometric indices, which indicates a slight variability of these traits within the range. At the same time, the detected significant differences between the northern and southern populations in the absolute size of the shell can presumably be explained by the conditions of specific habitats. At the same time, a more favorable temperature regime in the south may be offset by a lack of oxygen, including during the summer-autumn low water period.
Ecological monitoring was carried out in Kossou Lake, one of largest and most important in Côte d’Ivoire, in particular in its low section more vulnerable because functioning as a receptacle of all anthropogenic pollutions. In this perspective, by means of four sampling points defining a linear transect was explored eight times from November 2017 to September 2018, we investigated the macroinvertebrate community so as to characterize the environmental factor governing their spatial distribution. This aquatic fauna was sampled with both hand-net (mesh size: 250 mm) and Van Venn grab. The environmental variables were also recorded. A total of 4500 organisms belonging to 135 taxa, 71 families, 12 orders and seven classes were collected. The indices diversity declined progressively from littoral to sublittoral zones. Numerically, the samples were dominated by Chironomidae (Insects) and Thiaridae (Gastropods). Multivariate analysis provided evidence firstly that indicator taxa were only identified in the littoral zone through the indicator value (IndVal) index. After all that, the generalized additive model based on constant taxa shows that the environmental parameters such as depth, pH, temperature, conductivity and dissolved oxygen have contributed to the occurrence of these taxa. Apparently, some species would appear to have acquired some coping methods against of the numerous anthropogenic pressures. Therefore, it would be necessary to control the occupation style of the watershed to preserve the littoral zones of this lake, which is an asset to the expansion of aquatic biodiversity.
