Anthropogenic impacts on the distribution and biodiversity of benthic macroinvertebrates and water quality of the Langat River, Peninsular Malaysia

Azrina, M.Z.; Yap, Chee Kong; Ismail, Ahmad; Tan, Soon Guan

doi:10.1016/j.ecoenv.2005.04.003

Cited by 241 publications

(147 citation statements)

References 30 publications

Supporting

Mentioning

118

Contrasting

Unclassified

Order By: Relevance

“…Particularmente, los estudios en humedales de las zonas tropicales son escasos (Pamplin, Almeida & Rocha, 2006;Lucca, Pamplin, Gessner, Trivinho-Strixino, SpadanoAlburquerque & Rocha (2010). La mayoría de los estudios se han enfocado al análisis de macroinvertebrados bentónicos como indicadores de la calidad del agua en ríos (Azrina & Yap, 2006;Stein, Springer & Kohlmann, 2008;Lock, Asenova & Goethals, 2011). Considerando que la diversidad de macroinvertebrados es un indicador de la salud global de un humedal (Sharma & Rawat, 2009) y que su composición puede presentar fluctuaciones en número de táxones y abundancia por efecto de las condiciones ambientales, en el presente estudio se evaluó la variación espacial y temporal de las comunidades de macroinvertebrados de la Laguna de Tecocomulco, México, humedal inscrito en la Convención Ramsar desde 2003 y su relación con algunas variables ambientales.…”

unclassified

Patrones de variación espacial y temporal de los macroinvertebrados acuáticos en la Laguna de Tecocomulco, Hidalgo (México)

Rico-Sánchez

Rodríguez-Romero

López‐López

et al. 2014

RBT

View full text Add to dashboard Cite

Spatial and temporal variation patterns in aquatic macroinvertebrates of Tecocomulco Lake, Hidalgo (México). Lake Tecocomulco, Hidalgo, is a relic of the ancient lakes of Anahuac, important for the conservation of resident and migratory birds. However, the composition of aquatic macroinvertebrates is unknown; this is an important gap in conservation as they play an important role in the food web. This study analyzed the spatial and temporal variations in macroinvertebrate assemblages and their relationship with habitat characteristics. We carried out four monitoring campaigns covering the rainy and dry seasons. The monitoring was conducted at six study sites (four in the littoral zone and two in the middle part of the lake), environmental factors were recorded at each study site, water samples were collected for their physical and chemical analysis and aquatic macroinvertebrates were collected. A principal component analysis (PCA) was used to group study sites based on physical and chemical characteristics. Richness of taxa was analysed with rarefaction. We assessed the importance value index of each taxon (considering their frequency of occurrence and abundance). Similarity analyzes were performed between study sites and similarity of taxa with indices of Jaccard and Bray-Curtis, respectively. We performed a canonical correspondence analysis (CCA) between environmental factors and macroinvertebrate taxa. The PCA showed a marked seasonal variation represented by warm periods, with high values of conductivity, alkalinity, hardness, sulfates, and macronutrients (N and P) and the cold period with low values. We found a total of 26 taxa of aquatic macroinvertebrates and the highest richness was found in August. The Jaccard similarity analysis found differences between the littoral area and the limnetic zone, which differ also in the composition of macrophytes. The littoral zone had the highest taxa richness of macroinvertebrates and macrophytes, while the lowest diversity was found in the offshore zone. The CCA related physicochemical characteristics of the water body with macroinvertebrate taxa showing the influence of both physicochemical characteristics and the composition of macrophytes in the spatio-temporal patterns of aquatic macroinvertebrates in the lake. The dominance of Corixidae highlights a strong grazing activity in the lake and in turn suggests an important amount of food available for higher trophic levels. Our study shows that the macroinvertebrates of Tecocomulco Lake have spatial and seasonal variations that are related to both environmental and biotic factors with groups being dominant. Rev. Biol. Trop. 62 (Suppl. 2): 81-96. Epub 2014 April 01.

show abstract

unclassified

Patrones de variación espacial y temporal de los macroinvertebrados acuáticos en la Laguna de Tecocomulco, Hidalgo (México)

Rico-Sánchez

Rodríguez-Romero

López‐López

et al. 2014

RBT

View full text Add to dashboard Cite

show abstract

“…Although the diversity and distributional pattern of molluscs in Epe Lagoon seems to be related mainly to the natural estuarine gradient and sediment characteristics, anthropogenic factors indirectly may also influence molluscan communities (Oyenekan, 1979;Clements, 1997;Wiegner et al, 2003;Goto and Wallace, 2010), especially in areas with multiple sources of human stressors (Hewitt et al, 2005), where the dominance of few species may indicate systems subjected to organic enrichment and contaminated sediments (Gray and Mirza, 1979;Dauer, 1993;Azrina et al, 2006). Epe Lagoon is an estuarine system with a history of pollution (Nwankwo, 1998;Nwankwo and Onitiri, 1992), therefore, monitoring programmers relating to significant long-term changes in molluscs communities (species disappearance, and shifts in composition, densities and frequencies) will serve as invaluable tools for the assessment of the impact of human activities in the lagoon.…”

Section: Discussionmentioning

confidence: 99%

Spatial Patterns in Diversity and Distribution of Benthic Molluscs in a Weak Tidal Tropical Lagoon

Uwadiae¹

2013

ijms

View full text Add to dashboard Cite

Spatial patterns in diversity and distribution of benthic molluscs in a weak tidal tropical lagoon in south-west Nigeria were investigated from samples collected in eight study stations distributed along the stretch of the lagoon for two consecutive years. The study also investigated selected environmental conditions of overlying water and sediment of the lagoon to establish the roles played by environmental variables. There was a significant variation (p < 0.05) in salinity values along the study stretch which was predicated on the existing gradient in salinity of the lagoon. Higher values of mud and Total organic content (TOC) of sediment occurred in upstream compared to values observed in downstream stations. Mollusc communities were significantly influenced by the spatial gradient in salinity and variability in sediment parameters. The downstream stations had brackish conditions, while the upstream stations were typically freshwater, leading to differences in the composition and abundance of molluscs. The downstream stations recorded higher density and diversity of mollusc compared to upstream stations. Our results suggest that benthic molluscs in Epe Lagoon show spatial patterns related to differences in environmental parameters.

show abstract

“…The sensitive families e.g. Ephemeroptera which are known to negatively react to environmental stress (Azrina et al, 2006;Boonsoong et al, 2009), did not show a decline in population among the upstream stations of the Regulating Pond and the downstream stations receiving water discharge. Surprisingly, mollusc's populations didn't decrease in sites located after water discharge.…”

Section: Discussion -Conclusionmentioning

confidence: 99%

Spatial and temporal variation of benthic macroinvertebrates in the Nam Gnom Basin receiving discharged waters from the Nam Theun 2 Reservoir (Lao PDR)

Clavier¹,

Cottet

Favriou

et al. 2015

Hydroécol. Appl.

View full text Add to dashboard Cite

-In order to assess the impact of water release in the downstream area of the Nam Theun 2 Reservoir (Lao PDR), the spatial and temporal variation of benthic macroinvertebrates was explored. Between 2010 and 2012, five sites were monitored in the Nam Gnom Basin, a tributary of the Xe Bangfai River, receiving the turbinated waters. Repeatedtime collections revealed the presence of 109 taxa mainly identified to the family level, attesting to a rich biota. Preliminary results did not show shifts in diversity, population composition, and feeding metrics. Redundancy Analysis indicated that the altitudinal gradient (i.e. altitude and altitude-related variables) remained the major environmental factor influencing the macroinvertebrates distribution before water discharge. The presence of a tributary downstream of the release point, and the respect of the natural river inflow can explain the preservation of natural conditions. More samples and a strengthened ecological knowledge of Southeast Asian macroinvertebrates are still required to confirm these preliminary results.Key words -freshwater invertebrates, Southeast Asia, biomonitoring, hydropower, downstream section Résumé -Afin d'évaluer l'impact du relâcher des eaux dans la zone aval du Réservoir Nam Theun 2 (RDP du Laos), la variabilité spatio-temporelle des invertébrés aquatiques a été étudiée. Entre 2010 et 2012, cinq sites ont été échantillonnés sur le bassin de la Nam Gnom, un affluent de la rivière Xe Bangfai, qui reçoit les eaux turbinées. Les prélèvements issus du suivi ont permis de mettre en évidence la présence de 109 taxa principalement

show abstract

Anthropogenic impacts on the distribution and biodiversity of benthic macroinvertebrates and water quality of the Langat River, Peninsular Malaysia

Cited by 241 publications

References 30 publications

Patrones de variación espacial y temporal de los macroinvertebrados acuáticos en la Laguna de Tecocomulco, Hidalgo (México)

Patrones de variación espacial y temporal de los macroinvertebrados acuáticos en la Laguna de Tecocomulco, Hidalgo (México)

Spatial Patterns in Diversity and Distribution of Benthic Molluscs in a Weak Tidal Tropical Lagoon

Spatial and temporal variation of benthic macroinvertebrates in the Nam Gnom Basin receiving discharged waters from the Nam Theun 2 Reservoir (Lao PDR)

Contact Info

Product

Resources

About