Size-mass relationships of Melanoides tuberculatus (Thiaridae: Gastropoda) in a eutrophic reservoir

Neto, Eduardo Carvalho da Silva; Molozzi, Joseline; Callisto, Marcos

doi:10.1590/s1984-46702010000500004

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…La metodología de recolección de los moluscos se efectuó mediante el tubo de Penchaszadeh, el cual tiene una longitud de 1 m con un diámetro de 15 cm, la profundidad de incorporación en el sustrato fue hasta los 20 cm (0,32 m 2 ), obteniendo un volumen de 0,003 m³ (Penchaszadeh, 1971;Bijoy, 2016), posteriormente la muestra fue tamizada en una malla de 1000 um (Iannacone et al, 2003). El esfuerzo de muestreo fue uniforme, representado por tres réplicas en cada estación (Lindenmayer & Likens, 2010;Silva et al, 2010;Vizcardo & Gil-Kodaka, 2015), procurando abarcar diversos microhábitats (Vivar et al, 1996;Maltchik et al, 2010) y zonas establecidas para el humedal (Pulido & Bermudez, 2018).…”

Section: Materials Y Métodosunclassified

Drástica Disminución De La Comunidad De Gasterópodos en El Refugio De Vida Silvestre Los Pantanos De Villa, Lima, Perú

Torres-Zevallos¹,

Llontop

Alvariño

et al. 2020

Biotempo

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Más de la mitad de gasterópodos dulceacuícolas se encuentran en alguna categoría de conservación a nivel mundial. El objetivo del presente estudio fue evaluar la drástica disminución de la comunidad de gasterópodos del Refugio de Vida Silvestre Los Pantanos de Villa (RVSPV), Lima, Perú entre los años 2005 al 2010. Se recolectaron 8640 gasterópodos procedentes de ocho estaciones de muestreo próximas a la laguna “Marvilla” del RVSPV. Se obtuvieron las abundancias relativas por especie, familias y año de estudio. La densidad poblacional de gasterópodos (ind·m-²) entre años de estudio por familias fue analizada, además se agrupó entre especies nativas y exóticas. Se evaluó el efecto de la calidad del agua, establecida por factores fisicoquímicos, en la densidad de gasterópodos según familia y año de estudio. La diversidad alfa para la comunidad de gasterópodos abarcó los índices de diversidad alfa: S (Riqueza), H' (Shannon-Wiener), D (Simpson), DMn (Menhinick) por año de estudio. La fauna malacológica registró ocho especies de gasterópodos entre los años 2005-2010: Heleobia cumingii (d'Orbigny, 1835), Melanoides tuberculata (O. F. Müller, 1774), Pectinidens diaphanus (King, 1832), Physella venustula (Gould, 1847), Mexinauta peruvianus (Gray, 1828), Drepanotrema kermatoides (d'Orbigny, 1835), Helisoma peruvianum Broderip, 1832) y Planorbella trivolvis (Say, 1817). H. cumingii (2005: 73%; 2010: 57%) y M. tuberculata (2005: 19%; 2010: 37%) presentaron las mayores abundancias relativas, sus densidades iniciaron en 845,8 y 217,2 ind·m-2 finalizando en 9,22 y 6,06 ind·m-2 al año 2010. Las densidades por familia y especie fueron diferentes entre los años de estudio, con una fuerte tendencia a la reducción. No se hallaron especímenes vivos de P. diaphanus, P. venustula y H. peruvianum para el año 2010. La reducción de la comunidad de gasterópodos en el periodo estudiado implica que los gasterópodos dulceacuícolas representan uno de los grupos taxonómicos más amenazados y vulnerables del RVSPV.

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Section: Materials Y Métodosunclassified

Drástica Disminución De La Comunidad De Gasterópodos en El Refugio De Vida Silvestre Los Pantanos De Villa, Lima, Perú

Torres-Zevallos¹,

Llontop

Alvariño

et al. 2020

Biotempo

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“…The most commonly used method deals with the quantification of a shell’s linear dimensions such as shell length, shell width or number of whorl increments, which are then plotted against time (e.g., Kobayashi & Hadfield, 1996 ; Sulikowska-Drozd, 2011 ). Although these measurements are good estimators of the overall growth of the animal’s soft body (measured in weight; Oosterhoff, 1977 ; Chow, 1987 ; Elkarmi & Ismail, 2007 ; Silva, Molozzi & Callisto, 2010 ), they can hardly be linked with the accretionary growth process and spiral geometry of the shell. In addition, shell growth may be episodic because of different seasons, diurnal rhythms, or periods of activity and inactivity ( Linsley & Javidpour, 1980 ).…”

Section: Introductionmentioning

confidence: 99%

On growth and form of irregular coiled-shell of a terrestrial snail:Plectostoma concinnum(Fulton, 1901) (Mollusca: Caenogastropoda: Diplommatinidae)

Liew

Kok

Urdy

2014

PeerJ

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The molluscan shell can be viewed as a petrified representation of the organism’s ontogeny and thus can be used as a record of changes in form during growth. However, little empirical data is available on the actual growth and form of shells, as these are hard to quantify and examine simultaneously. To address these issues, we studied the growth and form of a land snail that has an irregularly coiled and heavily ornamented shell–Plectostoma concinnum. The growth data were collected in a natural growth experiment and the actual form changes of the aperture during shell ontogeny were quantified. We used an ontogeny axis that allows data of growth and form to be analysed simultaneously. Then, we examined the association between the growth and the form during three different whorl growing phases, namely, the regular coiled spire phase, the transitional constriction phase, and the distortedly-coiled tuba phase. In addition, we also explored the association between growth rate and the switching between whorl growing mode and rib growing mode. As a result, we show how the changes in the aperture ontogeny profiles in terms of aperture shape, size and growth trajectory, and the changes in growth rates, are associated with the different shell forms at different parts of the shell ontogeny. These associations suggest plausible constraints that underlie the three different shell ontogeny phases and the two different growth modes. We found that the mechanism behind the irregularly coiled-shell is the rotational changes of the animal’s body and mantle edge with respect to the previously secreted shell. Overall, we propose that future study should focus on the role of the mantle and the columellar muscular system in the determination of shell form.

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“…Kobayashi & Hadfield, 1996;Sulikowska-Drozd, 2011). Although these measurements are good estimators of the overall growth of the animal's soft body (measured in weight; Oosterhoff, 1977;Chow, 1987;Elkarmi & Ismail, 2007;Silva, Molozzi & Callisto, 2010), they can hardly be linked with the accretionary growth process and spiral geometry of the shell. In addition, shell growth may be episodic because of different seasons, diurnal rhythms, or periods of activity and inactivity (Linsley & Javidpour 1980).…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "On growth and form of irregular coiled-shell of a terrestrial snail: Plectostoma concinnum (Fulton, 1901) (Mollusca: Caenogastropoda: Diplommatinidae) (v0.1)"

Baets¹

2014

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The molluscan shell can be viewed as a petrified representation of the organism's ontogeny and thus can be used as a record of changes in form during growth. However, little empirical data is available on the actual growth and form of shells, as these are hard to quantify and examine simultaneously. To address these issues, we studied the growth and form of a land snail that has a irregularly coiled and heavily ornamented shell-Plectostoma concinnum. The growth data were collected in a natural growth experiment and the actual form changes of the aperture during shell ontogeny were quantified. We used an ontogeny axis that allows data of growth and form to be analysed simultaneously. Then, we examined the association between the growth and the form during three different whorl growing phases, namely, the regular coiled spire phase, the transitional constriction phase, and the distortedly-coiled tuba phase. In addition, we also explored the association between growth rate and the switching between whorl growing mode and rib growing mode. As a result, we show how the changes in the aperture ontogeny profiles in terms of aperture shape, size and growth trajectory, and the changes in growth rates, are associated with the different shell forms at different parts of the shell ontogeny. These associations suggest plausible constraints that underlie the three different shell ontogeny phases and the two different growth modes. We found that the mechanism behind the irregularly coiled-shell is the rotational changes of the animal's body and mantle edge with respect to the previously secreted shell. Overall, we propose that future study should focus on the role of the mantle and the columellar muscular system in the determination of shell form.

show abstract

Size-mass relationships of Melanoides tuberculatus (Thiaridae: Gastropoda) in a eutrophic reservoir

Cited by 4 publications

References 14 publications

Drástica Disminución De La Comunidad De Gasterópodos en El Refugio De Vida Silvestre Los Pantanos De Villa, Lima, Perú

Drástica Disminución De La Comunidad De Gasterópodos en El Refugio De Vida Silvestre Los Pantanos De Villa, Lima, Perú

On growth and form of irregular coiled-shell of a terrestrial snail:Plectostoma concinnum(Fulton, 1901) (Mollusca: Caenogastropoda: Diplommatinidae)

Peer Review #1 of "On growth and form of irregular coiled-shell of a terrestrial snail: Plectostoma concinnum (Fulton, 1901) (Mollusca: Caenogastropoda: Diplommatinidae) (v0.1)"

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