Comparative Environmental Assessment in the Studies of Benthic Diatom, Macroinvertebrate, and Fish Communities

Passy, Sophia I.; Bode, Robert W.; Carlson, Douglas M.; Novak, M.A.

doi:10.1002/iroh.200310721

Cited by 46 publications

(27 citation statements)

References 41 publications

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“…The difference in the community structure despite the dominance by diatoms is mainly due to the importance assumed by Cyanophyceae, Chlorophyceae and Euglenophyceae in the phytoplankton community. However, the distribution of diatoms reflects the average ecological conditions of this aquatic environment [14] . Dinoflagellates were the least abundant and this might be attributed to their inefficiency to compete for nutrients [15,16] .…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton Community of Elechi Creek, Niger Delta, Nigeria-A Nutrient-Polluted Tropical Creek

Davies¹,

Abowei²,

Tawari³

2009

American J. of Applied Sciences

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Problem statement: Elechi Creek of the Upper Bonny Estuary in the Niger Delta contributes to the Rivers State Fish resources. It is a sink receiving organic anthropogenic wastes from Diobu, Eagle Island and waterfront dwellers of Diobu areas. Fishing, car washing, bathing, swimming and other human activities are constantly going on within and around this creek. Based on these activities, there is urgent need to study the phytoplankton community that supports its fisheries. Approach: The study investigated the phytoplankton composition, diversity, abundance and distribution as well as surface water physico-chemical parameters. Phytoplankton and surface water samples were collected bi-monthly from October 2007-March 2008 at high tide from five stations according to APHA methods. These were analyzed for temperature, transparency, dissolved oxygen, salinity, alkalinity, chloride and nutrients. Phytoplankton was identified microscopically. Species diversity was calculated using standard indices. Results: A total of 169 species of phytoplankton, based on cell counts, was dominated by diatoms, 33255 counts mL^-1 (36%) and blue-green algae, 32909 counts mL^-1 (35.7%) were identified. The abundance of phytoplankton decreased downstream of this creek (1>2>3>4) except in station 5 with the highest phytoplankton abundance (23938 counts mL^-1). There was slight fluctuation in the measured physico-chemical parameters. The results of this study indicated the characteristic species and distribution of phytoplankton in Elechi Creek during the dry months. Conclusion/Recommendation: The high level of phosphate above the permissive limit showed that this creek is hypereutrophic and organic polluted. The high nutrients status favors the high abundance of phytoplankton. The municipal effluents (especially raw human and animal faces) discharges must be discontinued. Detergents with low concentration of phosphate are recommended for manufacturing and use. Municipal wastes must be treated and/or recycled before discharge into this natural aquatic body. Therefore, a continuous environmental surveillance of this creek is advocated to keep its biological integrity

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Section: Discussionmentioning

confidence: 99%

Phytoplankton Community of Elechi Creek, Niger Delta, Nigeria-A Nutrient-Polluted Tropical Creek

Davies¹,

Abowei²,

Tawari³

2009

American J. of Applied Sciences

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“…Nevertheless, some algae inhibit the growth of others, for example, Pyrmnesium parvum suppresses other algae by production of allelopathic chemical [48]. Passy et al [49] reported that diatoms distribution is associated with a downstream increase in nutrient level and organic pollution.…”

Section: Phytoplankton Community Of Okpokamentioning

confidence: 99%

Tidal Influence on Nutrients Status and Phytoplankton Population of Okpoka Creek, Upper Bonny Estuary, Nigeria

Davies

Ugwumba

2013

Journal of Marine Biology

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Okpoka Creek of the Upper Bonny Estuary in the Niger Delta is a tidal creek receiving organic anthropogenic effluents from its environs. The study investigated the influence of tides (low and high) on the species composition, diversity, abundance, and distribution of phytoplankton. The surface water and phytoplankton samples were collected monthly from May 2004 to April 2006 at both tides from ten stations according to standard methods. Phytoplankton was identified microscopically. Species diversity was calculated using standard indices. Data analyses were done using analysis of variance, Duncan multiple range, and descriptive statistics. Phosphate and ammonia exceeded international acceptable levels of 0.10 mg/L for natural water bodies indicating high nutrient status, organic matter, and potential pollutants. A total of 158 species of phytoplankton were identified. Diatoms dominated the phytoplankton (62.9%). Diversity indices of diatoms were1.5±0.03(Margalef) and0.8±0.01(Shannon). Pollution-indicator species such asNavicula microcephala,Nitzschia sigma,Synedra ulna(diatoms),Cladophora glomerata(green alga),Euglena acus(euglenoid),Anabeana spiroides(blue-green alga), andCeratium furca(dinoflagellate) were recorded at either only low, high or both tides. Concerted environmental surveillance on Upper Bonny Estuary is advocated to reduce the inflow of pollutants from the Bonny Estuary into this Creek caused by tidal influence.

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“…These three indicators were studied because each biological assemblage responds differentially to broad-scale environmental factors (Barbour et al, 1999;UNESCO, 2004). Thus, bioassessment using assemblages for different trophic levels can be used to closely evaluate scale-dependent ecological phenomena (Levin, 1992) and the results for the different trophic levels can complement one another (Passy et al, 2004). Because of these advantages, the three levels of bioindicators were selected as biocriteria, and tools for their quantitative assessments were developed.…”

Section: Development Of Naempmentioning

confidence: 99%

Overview and application of the National Aquatic Ecological Monitoring Program (NAEMP) in Korea

Lee

Hwang

Lee

et al. 2011

Ann. Limnol. - Int. J. Lim.

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-This paper provides an overview of the development and application of the National Aquatic Ecological Monitoring Program (NAEMP) in Korea, which uses biological and habitat-riparian criteria for river/stream and watershed management. Development of NAEMP began in 2003, with recognition by the Korean Ministry of Environment (MOE) of the limitations of applying chemical parameters (e.g., biochemical oxygen demand (BOD)) as the principal targets of water environment management. Ecosystem health criteria under NAEMP were developed from 2003 to 2006. Candidate sites for monitoring were also screened and established across the country. NAEMP was implemented in 2007, and since then a standard protocol of nationwide monitoring based on multi-criteria has been implemented to assess the ecological condition of rivers and streams. The monitoring results indicate that many Korean rivers and streams are severely degraded, with biological conditions that are much worse than their water chemistry suggests. In 2009, 24% of rivers and streams were in classes C (Fair) and D (Poor) for BOD, but more than 71, 53, and 27% were categorized as Fair to Poor according to fish, diatom, and benthic macroinvertebrate assemblages, respectively. NAEMP is promising in that the results have already had great impacts on policy making and scientific research relevant to lotic water environment and watershed management in Korea. In the future, NAEMP results will be used to develop more aggressive regulations for the preservation and restoration of rivers/ streams, riparian buffer areas and watersheds. Another future aim of the NAEMP is to develop aquatic ecological modeling based on the monitoring results.

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Comparative Environmental Assessment in the Studies of Benthic Diatom, Macroinvertebrate, and Fish Communities

Cited by 46 publications

References 41 publications

Phytoplankton Community of Elechi Creek, Niger Delta, Nigeria-A Nutrient-Polluted Tropical Creek

Phytoplankton Community of Elechi Creek, Niger Delta, Nigeria-A Nutrient-Polluted Tropical Creek

Tidal Influence on Nutrients Status and Phytoplankton Population of Okpoka Creek, Upper Bonny Estuary, Nigeria

Overview and application of the National Aquatic Ecological Monitoring Program (NAEMP) in Korea

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