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A comparison of the larvivorous habits of exotic Poecilia reticulata and native Aplocheilus parvus
BACKGROUND: The exotic fish Poecilia reticulata is promoted in the tropics as a biological control agent for aquatic pathogenic carriers, such as mosquitoes. Such control measures are often adopted blindly, ignoring the potential of native species and the adverse effects of introduced species. The p...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092854/ https://www.ncbi.nlm.nih.gov/pubmed/30107827 http://dx.doi.org/10.1186/s12898-018-0180-1 |
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author | Fernando, G. K. Achini W. Jayakody, Sevvandi Wijenayake, W. M. Hiranya K. Galappaththy, Gawrie N. L. Yatawara, Mangala Harishchandra, Jeevanie |
author_facet | Fernando, G. K. Achini W. Jayakody, Sevvandi Wijenayake, W. M. Hiranya K. Galappaththy, Gawrie N. L. Yatawara, Mangala Harishchandra, Jeevanie |
author_sort | Fernando, G. K. Achini W. |
collection | PubMed |
description | BACKGROUND: The exotic fish Poecilia reticulata is promoted in the tropics as a biological control agent for aquatic pathogenic carriers, such as mosquitoes. Such control measures are often adopted blindly, ignoring the potential of native species and the adverse effects of introduced species. The present study was conducted to assess the diet composition of two species of fish, the native Aplocheilus parvus and exotic P. reticulata, and to assess the availability of food items in their natural environment in four types of aquatic systems. Diet composition was estimated using 24 h gut contents analysis, in a clay quarry pit and a perennial reservoir for A. parvus, and in a man-made canal and a second-order natural stream for P. reticulata. Food items in these environments were quantified by analyzing water samples collected every 2 h. RESULTS: The diet of A. parvus in the clay quarry pit and reservoir consisted of adult or larval stages of Insecta, Maxillopoda and Malacostraca. In both habitats, A. parvus selectively fed on insect parts and insect larvae. The diet of P. reticulata consisted of filamentous algae, diatoms and detritus. The diet of A. parvus showed active selection of insectivore food items against their low availability. In contrast, the diet of P. reticulata showed consumption of food items in accordance with their availability in the environment. The highest mean number of food items in the gut for A. parvus was recorded around mid-day in the clay quarry pit, but no peak feeding time was identified in the perennial reservoir. For P. reticulata, peak feeding was recorded around mid-day in both the habitats. CONCLUSION: Irrespective of the type of environment and rate of occurrence, A. parvus preferred insect and insect larvae, whereas P. reticulata consumed the most readily available food items. The active selection of insects by A. parvus suggests they may have value as a biological control agent. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s12898-018-0180-1) contains supplementary material, which is available to authorized users. |
format | Online Article Text |
id | pubmed-6092854 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-60928542018-08-20 A comparison of the larvivorous habits of exotic Poecilia reticulata and native Aplocheilus parvus Fernando, G. K. Achini W. Jayakody, Sevvandi Wijenayake, W. M. Hiranya K. Galappaththy, Gawrie N. L. Yatawara, Mangala Harishchandra, Jeevanie BMC Ecol Research Article BACKGROUND: The exotic fish Poecilia reticulata is promoted in the tropics as a biological control agent for aquatic pathogenic carriers, such as mosquitoes. Such control measures are often adopted blindly, ignoring the potential of native species and the adverse effects of introduced species. The present study was conducted to assess the diet composition of two species of fish, the native Aplocheilus parvus and exotic P. reticulata, and to assess the availability of food items in their natural environment in four types of aquatic systems. Diet composition was estimated using 24 h gut contents analysis, in a clay quarry pit and a perennial reservoir for A. parvus, and in a man-made canal and a second-order natural stream for P. reticulata. Food items in these environments were quantified by analyzing water samples collected every 2 h. RESULTS: The diet of A. parvus in the clay quarry pit and reservoir consisted of adult or larval stages of Insecta, Maxillopoda and Malacostraca. In both habitats, A. parvus selectively fed on insect parts and insect larvae. The diet of P. reticulata consisted of filamentous algae, diatoms and detritus. The diet of A. parvus showed active selection of insectivore food items against their low availability. In contrast, the diet of P. reticulata showed consumption of food items in accordance with their availability in the environment. The highest mean number of food items in the gut for A. parvus was recorded around mid-day in the clay quarry pit, but no peak feeding time was identified in the perennial reservoir. For P. reticulata, peak feeding was recorded around mid-day in both the habitats. CONCLUSION: Irrespective of the type of environment and rate of occurrence, A. parvus preferred insect and insect larvae, whereas P. reticulata consumed the most readily available food items. The active selection of insects by A. parvus suggests they may have value as a biological control agent. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1186/s12898-018-0180-1) contains supplementary material, which is available to authorized users. BioMed Central 2018-08-14 /pmc/articles/PMC6092854/ /pubmed/30107827 http://dx.doi.org/10.1186/s12898-018-0180-1 Text en © The Author(s) 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Article Fernando, G. K. Achini W. Jayakody, Sevvandi Wijenayake, W. M. Hiranya K. Galappaththy, Gawrie N. L. Yatawara, Mangala Harishchandra, Jeevanie A comparison of the larvivorous habits of exotic Poecilia reticulata and native Aplocheilus parvus |
title | A comparison of the larvivorous habits of exotic Poecilia reticulata and native Aplocheilus parvus |
title_full | A comparison of the larvivorous habits of exotic Poecilia reticulata and native Aplocheilus parvus |
title_fullStr | A comparison of the larvivorous habits of exotic Poecilia reticulata and native Aplocheilus parvus |
title_full_unstemmed | A comparison of the larvivorous habits of exotic Poecilia reticulata and native Aplocheilus parvus |
title_short | A comparison of the larvivorous habits of exotic Poecilia reticulata and native Aplocheilus parvus |
title_sort | comparison of the larvivorous habits of exotic poecilia reticulata and native aplocheilus parvus |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092854/ https://www.ncbi.nlm.nih.gov/pubmed/30107827 http://dx.doi.org/10.1186/s12898-018-0180-1 |
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