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Article: Novel cichlid-dominated fish assemblages in tropical urban reservoirs

TitleNovel cichlid-dominated fish assemblages in tropical urban reservoirs
Authors
Issue Date2020
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14634988.asp
Citation
Aquatic Ecosystem Health & Management, 2020, v. 23 n. 3, p. 249-266 How to Cite?
AbstractRecent biodiversity surveys in the lentic habitats of Singapore revealed that non-native cichlids (at least 14 species from different origins) were the most abundant species in the reservoirs of Singapore. To understand the diversity and distribution patterns in six reservoirs (two inland and four coastal), we investigated the species richness and abundances of these cichlids. We also investigated foodwebs to characterise the trophic relationships of cichlids relative to the aquatic community using stable isotope and gut content analyses in each reservoir. Based on various sampling methods (electrofishing, netting and trapping), a total of 5,675 individual cichlids representing 14 species and two hybrids were caught. The three most abundant species (contributing to 66.8% of all cichlids) included the green chromide, Etroplus suratensis, the eartheater cichlid, Geophagus altifrons, and the Orinoco Peacock Bass, Cichla orinocensis. Based on a canonical correspondence analysis, we found that the distribution and abundances of cichlids appeared to be related to abiotic parameters such as salinity and dissolved oxygen, and that species richness and abundances of cichlids differed between coastal and inland reservoirs. We also found that the trophic positions of different cichlid species varied within and across the reservoirs surveyed, where sympatry between highly specialised as well as generalist cichlid species were commonly observed. This was reflected in both the gut contents as well as the empirical foodwebs generated. While we are unable to determine source and timing of the introductions of these cichlids, we are at least confident that that many of the cichlids have already established in these six reservoirs. We postulate that the establishment success and the co-existence of this non-native group has come about through their ability to adapt to the conditions within each reservoir, and this is related to the life history strategies, feeding and behavioural patterns that these different cichlid species display.
Persistent Identifierhttp://hdl.handle.net/10722/285377
ISSN
2023 Impact Factor: 0.8
2023 SCImago Journal Rankings: 0.240
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorKwik, JTB-
dc.contributor.authorLim, BHR-
dc.contributor.authorLiew, JH-
dc.contributor.authorYeo, DCJ-
dc.date.accessioned2020-08-18T03:52:53Z-
dc.date.available2020-08-18T03:52:53Z-
dc.date.issued2020-
dc.identifier.citationAquatic Ecosystem Health & Management, 2020, v. 23 n. 3, p. 249-266-
dc.identifier.issn1463-4988-
dc.identifier.urihttp://hdl.handle.net/10722/285377-
dc.description.abstractRecent biodiversity surveys in the lentic habitats of Singapore revealed that non-native cichlids (at least 14 species from different origins) were the most abundant species in the reservoirs of Singapore. To understand the diversity and distribution patterns in six reservoirs (two inland and four coastal), we investigated the species richness and abundances of these cichlids. We also investigated foodwebs to characterise the trophic relationships of cichlids relative to the aquatic community using stable isotope and gut content analyses in each reservoir. Based on various sampling methods (electrofishing, netting and trapping), a total of 5,675 individual cichlids representing 14 species and two hybrids were caught. The three most abundant species (contributing to 66.8% of all cichlids) included the green chromide, Etroplus suratensis, the eartheater cichlid, Geophagus altifrons, and the Orinoco Peacock Bass, Cichla orinocensis. Based on a canonical correspondence analysis, we found that the distribution and abundances of cichlids appeared to be related to abiotic parameters such as salinity and dissolved oxygen, and that species richness and abundances of cichlids differed between coastal and inland reservoirs. We also found that the trophic positions of different cichlid species varied within and across the reservoirs surveyed, where sympatry between highly specialised as well as generalist cichlid species were commonly observed. This was reflected in both the gut contents as well as the empirical foodwebs generated. While we are unable to determine source and timing of the introductions of these cichlids, we are at least confident that that many of the cichlids have already established in these six reservoirs. We postulate that the establishment success and the co-existence of this non-native group has come about through their ability to adapt to the conditions within each reservoir, and this is related to the life history strategies, feeding and behavioural patterns that these different cichlid species display.-
dc.languageeng-
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/14634988.asp-
dc.relation.ispartofAquatic Ecosystem Health & Management-
dc.rightsThis is an Accepted Manuscript of an article published by Taylor & Francis in [Aquatic Ecosystem Health & Management] on [2020-06-22], available online: http://www.tandfonline.com/10.1080/14634988.2020.1778308-
dc.titleNovel cichlid-dominated fish assemblages in tropical urban reservoirs-
dc.typeArticle-
dc.identifier.emailLiew, JH: jhliew@hku.hk-
dc.description.naturepostprint-
dc.identifier.doi10.1080/14634988.2020.1778308-
dc.identifier.scopuseid_2-s2.0-85097799081-
dc.identifier.hkuros313035-
dc.identifier.volume23-
dc.identifier.issue3-
dc.identifier.spage249-
dc.identifier.epage266-
dc.identifier.isiWOS:000604758000001-
dc.publisher.placeUnited States-
dc.identifier.issnl1463-4988-

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