Staff View: Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams

Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams

Construction of cascade dams has been shown to have impacts on fish assemblages and biodiversity. Yet, there is no literature on fish assemblages in the Murum River that connects the cascading Bakun and Murum dams in Sarawak, Malaysia. Hence, study on this modified ecosystem is necessitated to bette...

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Main Authors:	Jongkar, Grinang, Lee, Nyanti, Soo, Chen Lin, Chundi, Afina-Yian, Lambat, Elsa-Cordelia-Durie, Alvinna, Tram, Ling, Teck Yee, Sim, Siong Fong, Tonny, Ganyai, Lee, Karen-Suan-Ping
Format:	Article
Language:	English
Published:	Hindawi Publishing 2021
Subjects:	QH Natural history QL Zoology
Online Access:	http://ir.unimas.my/id/eprint/34459/1/abstract%20pattern%20of%20fish%20assemblage.pdf http://ir.unimas.my/id/eprint/34459/ https://www.hindawi.com/journals/ijecol/2021/6652782/
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id	my.unimas.ir.34459
record_format	eprints
spelling	my.unimas.ir.344592023-03-30T04:01:16Z http://ir.unimas.my/id/eprint/34459/ Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams Jongkar, Grinang Lee, Nyanti Soo, Chen Lin Chundi, Afina-Yian Lambat, Elsa-Cordelia-Durie Alvinna, Tram Ling, Teck Yee Sim, Siong Fong Tonny, Ganyai Lee, Karen-Suan-Ping QH Natural history QL Zoology Construction of cascade dams has been shown to have impacts on fish assemblages and biodiversity. Yet, there is no literature on fish assemblages in the Murum River that connects the cascading Bakun and Murum dams in Sarawak, Malaysia. Hence, study on this modified ecosystem is necessitated to better understand the effects of the cascade dam construction on fish fauna. For this, fish samples were caught at five stations located along the river during both dry and wet seasons. Environmental parameters were taken concurrently with fish sampling. Length-weight relationship, condition factors, and diet composition of selected fish species in the river were also determined. The present study demonstrated that there are indications of the impact of cascading dams on the formation of a complex ecosystem in the Murum River, that is, changing from the shallow downstream of the Murum Dam to the deep transitional and inundated zone of the Bakun reservoir. The transitional zone in the Murum River exhibited the lowest fish species diversity, richness, and evenness during the dry season due to low pH and DO coupled with high turbidity. The biological indices improved when the water quality improved during the wet season. On the contrary, the diversity and evenness indices at the inundated tributary station decreased remarkably during the wet season, likely due to the migration of fish during the onset of the rainy season. This study showed that Barbonymus schwanenfeldii has a wider feeding habit which contributes to its higher distribution and abundance in the Murum River. The growth patterns of B. schwanenfeldii, Cyclocheilichthys apogon, Hampala macrolepidota, Lobocheilos ovalis, and Osteochilus enneaporos were better during wet than dry season. Overall, the condition factor of all native fish species in the Murum River was in poor to fair condition, whereas the exotic species, Oreochromis mossambicus, exhibited excellent condition (K value > 2) for both seasons. )e increase in the number of O. mossambicus coupled with its high condition factor indicates biological intrusion and a potential threat to the native fish species in the Murum River. Continuous monitoring is essential to detect in-time risk issues associated with environmental degradation and biological invasion in this regulated and inundated river ecosystem. Hindawi Publishing 2021-02-18 Article PeerReviewed text en http://ir.unimas.my/id/eprint/34459/1/abstract%20pattern%20of%20fish%20assemblage.pdf Jongkar, Grinang and Lee, Nyanti and Soo, Chen Lin and Chundi, Afina-Yian and Lambat, Elsa-Cordelia-Durie and Alvinna, Tram and Ling, Teck Yee and Sim, Siong Fong and Tonny, Ganyai and Lee, Karen-Suan-Ping (2021) Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams. International Journal of Ecology, 2021. pp. 1-10. ISSN 1687-9708 https://www.hindawi.com/journals/ijecol/2021/6652782/ DOI:10.1155/2021/6652782
institution	Universiti Malaysia Sarawak
building	Centre for Academic Information Services (CAIS)
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaysia Sarawak
content_source	UNIMAS Institutional Repository
url_provider	http://ir.unimas.my/
language	English
topic	QH Natural history QL Zoology
spellingShingle	QH Natural history QL Zoology Jongkar, Grinang Lee, Nyanti Soo, Chen Lin Chundi, Afina-Yian Lambat, Elsa-Cordelia-Durie Alvinna, Tram Ling, Teck Yee Sim, Siong Fong Tonny, Ganyai Lee, Karen-Suan-Ping Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams
description	Construction of cascade dams has been shown to have impacts on fish assemblages and biodiversity. Yet, there is no literature on fish assemblages in the Murum River that connects the cascading Bakun and Murum dams in Sarawak, Malaysia. Hence, study on this modified ecosystem is necessitated to better understand the effects of the cascade dam construction on fish fauna. For this, fish samples were caught at five stations located along the river during both dry and wet seasons. Environmental parameters were taken concurrently with fish sampling. Length-weight relationship, condition factors, and diet composition of selected fish species in the river were also determined. The present study demonstrated that there are indications of the impact of cascading dams on the formation of a complex ecosystem in the Murum River, that is, changing from the shallow downstream of the Murum Dam to the deep transitional and inundated zone of the Bakun reservoir. The transitional zone in the Murum River exhibited the lowest fish species diversity, richness, and evenness during the dry season due to low pH and DO coupled with high turbidity. The biological indices improved when the water quality improved during the wet season. On the contrary, the diversity and evenness indices at the inundated tributary station decreased remarkably during the wet season, likely due to the migration of fish during the onset of the rainy season. This study showed that Barbonymus schwanenfeldii has a wider feeding habit which contributes to its higher distribution and abundance in the Murum River. The growth patterns of B. schwanenfeldii, Cyclocheilichthys apogon, Hampala macrolepidota, Lobocheilos ovalis, and Osteochilus enneaporos were better during wet than dry season. Overall, the condition factor of all native fish species in the Murum River was in poor to fair condition, whereas the exotic species, Oreochromis mossambicus, exhibited excellent condition (K value > 2) for both seasons. )e increase in the number of O. mossambicus coupled with its high condition factor indicates biological intrusion and a potential threat to the native fish species in the Murum River. Continuous monitoring is essential to detect in-time risk issues associated with environmental degradation and biological invasion in this regulated and inundated river ecosystem.
format	Article
author	Jongkar, Grinang Lee, Nyanti Soo, Chen Lin Chundi, Afina-Yian Lambat, Elsa-Cordelia-Durie Alvinna, Tram Ling, Teck Yee Sim, Siong Fong Tonny, Ganyai Lee, Karen-Suan-Ping
author_facet	Jongkar, Grinang Lee, Nyanti Soo, Chen Lin Chundi, Afina-Yian Lambat, Elsa-Cordelia-Durie Alvinna, Tram Ling, Teck Yee Sim, Siong Fong Tonny, Ganyai Lee, Karen-Suan-Ping
author_sort	Jongkar, Grinang
title	Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams
title_short	Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams
title_full	Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams
title_fullStr	Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams
title_full_unstemmed	Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams
title_sort	patterns of fish assemblage, growth, and diet composition in a tropical river between two cascading hydropower dams
publisher	Hindawi Publishing
publishDate	2021
url	http://ir.unimas.my/id/eprint/34459/1/abstract%20pattern%20of%20fish%20assemblage.pdf http://ir.unimas.my/id/eprint/34459/ https://www.hindawi.com/journals/ijecol/2021/6652782/
_version_	1762396686249885696
score	13.211869

Patterns of Fish Assemblage, Growth, and Diet Composition in a Tropical River between Two Cascading Hydropower Dams

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