Growth rate fitting using the von Bertalanffy model: Analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae)

The genus Drepanotrema includes six species in Argentina. The life cycle in natural systems of Drepanotrema depressissimum, and D. lucidum has been little studied, except for some casual observations. The aim of this study is to analyze main population trends (age structures, recruitment periods, li...

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Autores principales: Rumi Macchi Zubiaurre, Alejandra, Gutiérrez Gregoric, Diego Eduardo, Roche, María Andrea de las Mercedes
Formato: Articulo
Lenguaje:Inglés
Publicado: 2007
Materias:
Ciencias Naturales
Zoología
Argentina
Drepanotrema spp.
Great Plata Basin
Growth-rates
Planorbidae
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83041
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83041
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Zoología
Argentina
Drepanotrema spp.
Great Plata Basin
Growth-rates
Planorbidae
spellingShingle Ciencias Naturales
Zoología
Argentina
Drepanotrema spp.
Great Plata Basin
Growth-rates
Planorbidae
Rumi Macchi Zubiaurre, Alejandra
Gutiérrez Gregoric, Diego Eduardo
Roche, María Andrea de las Mercedes
Growth rate fitting using the von Bertalanffy model: Analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae)
topic_facet Ciencias Naturales
Zoología
Argentina
Drepanotrema spp.
Great Plata Basin
Growth-rates
Planorbidae
description The genus Drepanotrema includes six species in Argentina. The life cycle in natural systems of Drepanotrema depressissimum, and D. lucidum has been little studied, except for some casual observations. The aim of this study is to analyze main population trends (age structures, recruitment periods, life span and curves of individual growth) in Paiva pond, Argentina. We explored growth model fitting and comparison methodologies between species and environments in Paiva pond and Isla Martín García (IMG), to determine interspecific patterns. Theoretical curves of von Bertalanffy's model for each population were contrasted with samplings using the χ2 test. Expected sizes were transformed into a percentage of maximum size and cohorts started from zero time, which allowed them to be independent of the real or estimated starting date and a comparison was possible. A similar time scale was used, because the k values proved to be sensitive to time scale. Maximum size reached by D. lucidum was 6.9 mm and by D. depressissimum 9.38 mm. Growth rates (k) fluctuated from 1.302 to 1.368 in the first and 1.339 to 1.509 in the second species. No statistically significant differences were found in growth curves among species inhabiting the Paiva pond and in the different IMG water bodies independent of the beginning of each cohort and maximum size. In general, no winter cohorts were observed, except in one population of D. kermatoides (IMG). Comparing circannual and biannual growth rhythms most of the species reached 60 % of their development during their first year, and 85 % or more during their second year.
format Articulo
Articulo
author Rumi Macchi Zubiaurre, Alejandra
Gutiérrez Gregoric, Diego Eduardo
Roche, María Andrea de las Mercedes
author_facet Rumi Macchi Zubiaurre, Alejandra
Gutiérrez Gregoric, Diego Eduardo
Roche, María Andrea de las Mercedes
author_sort Rumi Macchi Zubiaurre, Alejandra
title Growth rate fitting using the von Bertalanffy model: Analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae)
title_short Growth rate fitting using the von Bertalanffy model: Analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae)
title_full Growth rate fitting using the von Bertalanffy model: Analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae)
title_fullStr Growth rate fitting using the von Bertalanffy model: Analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae)
title_full_unstemmed Growth rate fitting using the von Bertalanffy model: Analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae)
title_sort growth rate fitting using the von bertalanffy model: analysis of natural populations of drepanotrema spp. snails (gastropoda: planorbidae)
publishDate 2007
url http://sedici.unlp.edu.ar/handle/10915/83041
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