Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor?
The length-weight relationship and condition factor have been broadly investigated in snails to obtain the index of physical condition of populations and evaluate habitat quality. Herein, our goal was to describe the best predictors that explain Achatina fulica biometrical parameters and well being...
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| Format: | Article |
| Language: | English |
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Instituto Internacional de Ecologia
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| Series: | Brazilian Journal of Biology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842009000400016&lng=en&tlng=en |
| _version_ | 1828355835681570816 |
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| author | FS. Albuquerque MC. Peso-Aguiar MJT. Assunção-Albuquerque L. Gálvez |
| author_facet | FS. Albuquerque MC. Peso-Aguiar MJT. Assunção-Albuquerque L. Gálvez |
| author_sort | FS. Albuquerque |
| collection | DOAJ |
| description | The length-weight relationship and condition factor have been broadly investigated in snails to obtain the index of physical condition of populations and evaluate habitat quality. Herein, our goal was to describe the best predictors that explain Achatina fulica biometrical parameters and well being in a recently introduced population. From November 2001 to November 2002, monthly snail samples were collected in Lauro de Freitas City, Bahia, Brazil. Shell length and total weight were measured in the laboratory and the potential curve and condition factor were calculated. Five environmental variables were considered: temperature range, mean temperature, humidity, precipitation and human density. Multiple regressions were used to generate models including multiple predictors, via model selection approach, and then ranked with AIC criteria. Partial regressions were used to obtain the separated coefficients of determination of climate and human density models. A total of 1.460 individuals were collected, presenting a shell length range between 4.8 to 102.5 mm (mean: 42.18 mm). The relationship between total length and total weight revealed that Achatina fulica presented a negative allometric growth. Simple regression indicated that humidity has a significant influence on A. fulica total length and weight. Temperature range was the main variable that influenced the condition factor. Multiple regressions showed that climatic and human variables explain a small proportion of the variance in shell length and total weight, but may explain up to 55.7% of the condition factor variance. Consequently, we believe that the well being and biometric parameters of A. fulica can be influenced by climatic and human density factors. |
| first_indexed | 2024-04-14T02:49:34Z |
| format | Article |
| id | doaj.art-d1208b805ca045b3a29ab6a928ae6ae3 |
| institution | Directory Open Access Journal |
| issn | 1678-4375 |
| language | English |
| last_indexed | 2024-04-14T02:49:34Z |
| publisher | Instituto Internacional de Ecologia |
| record_format | Article |
| series | Brazilian Journal of Biology |
| spelling | doaj.art-d1208b805ca045b3a29ab6a928ae6ae32022-12-22T02:16:21ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1678-437569387988510.1590/S1519-69842009000400016S1519-69842009000400016Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor?FS. Albuquerque0MC. Peso-Aguiar1MJT. Assunção-Albuquerque2L. Gálvez3Universidad de AlcaláUniversidade Federal da BahiaUniversidad de AlcaláUniversidad de AlcaláThe length-weight relationship and condition factor have been broadly investigated in snails to obtain the index of physical condition of populations and evaluate habitat quality. Herein, our goal was to describe the best predictors that explain Achatina fulica biometrical parameters and well being in a recently introduced population. From November 2001 to November 2002, monthly snail samples were collected in Lauro de Freitas City, Bahia, Brazil. Shell length and total weight were measured in the laboratory and the potential curve and condition factor were calculated. Five environmental variables were considered: temperature range, mean temperature, humidity, precipitation and human density. Multiple regressions were used to generate models including multiple predictors, via model selection approach, and then ranked with AIC criteria. Partial regressions were used to obtain the separated coefficients of determination of climate and human density models. A total of 1.460 individuals were collected, presenting a shell length range between 4.8 to 102.5 mm (mean: 42.18 mm). The relationship between total length and total weight revealed that Achatina fulica presented a negative allometric growth. Simple regression indicated that humidity has a significant influence on A. fulica total length and weight. Temperature range was the main variable that influenced the condition factor. Multiple regressions showed that climatic and human variables explain a small proportion of the variance in shell length and total weight, but may explain up to 55.7% of the condition factor variance. Consequently, we believe that the well being and biometric parameters of A. fulica can be influenced by climatic and human density factors.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842009000400016&lng=en&tlng=enAchatina fulicaalien speciesgastropodacondition factorinvasiveness species |
| spellingShingle | FS. Albuquerque MC. Peso-Aguiar MJT. Assunção-Albuquerque L. Gálvez Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor? Brazilian Journal of Biology Achatina fulica alien species gastropoda condition factor invasiveness species |
| title | Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor? |
| title_full | Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor? |
| title_fullStr | Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor? |
| title_full_unstemmed | Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor? |
| title_short | Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor? |
| title_sort | do climate variables and human density affect achatina fulica bowditch gastropoda pulmonata shell length total weight and condition factor |
| topic | Achatina fulica alien species gastropoda condition factor invasiveness species |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842009000400016&lng=en&tlng=en |
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