Impact of urbanization on aquatic insect assemblages in the coastal zone of Cameroon: the use of biotraits and indicator taxa to assess environmental pollution

Tchakonté, Siméon; Ajeagah, Gideon Aghaindum; Camara, Adama Idrissa; Diomande, Dramane; Tchatcho, Nectaire Lié Nyamsi; Ngassam, Pierre

doi:10.1007/s10750-015-2221-5

Cited by 33 publications

(18 citation statements)

References 43 publications

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“…Inversely, low values of these parameters observed in stations B1, B2, B3, M1, M2, S1 and S2 could be due to the absence of houses and industries. These observations are consistent with the results documented by Tchakonté et al [10] in urban and suburban streams of Douala. On the other hand, the significantly high values of oxydability in Douala watershed reflect the important input of domestic and industrial wastes.…”

Section: Characteristic Of Environmental Variablessupporting

confidence: 94%

“…Furthermore, negatively significant correlation recorded between rainfalls and current velocity revealed the impact of seasonal variability on the hydrological and even the ecological regime of wa-ter. Our results are closer to those of Diomandé [29] on some Ivorian rivers and Tchakonté et al [10] on some urban rivers in Douala Cameroon.…”

Section: Characteristic Of Environmental Variablessupporting

confidence: 89%

“…Furthermore, the increase of temperature in stations M2 and M3 would have favored the degradation of organic matter, which thus increase the electrical conductivity and reduce the oxygen content these stations. Similar results were documented for other Cameroonian rivers surface [10] [33]. High values of oxydability in stations M2 and M3 should be due to urban and industrials wastes.…”

Section: Characteristic Of Environmental Variablessupporting

confidence: 88%

“…Indeed, Chironominae are known as 'blood worms' because they are bright red, due to the presence of hemoglobin in their body fluids that enables them to respire at low oxygen concentrations and live in hypoxic or occasional anoxic bottom mud [10] [37] [38]. Moreover, they can build inter-connected galleries in mud, which are then ventilated by undulatory movements; or they can prolong their tubes above the surface of the sediment to capture oxygen molecules [39] [40].…”

Section: Influence Of Environmental Factors On the Abundance Dynamic mentioning

confidence: 99%

“…The physid individuals and chironomid larvae are well adapted to live in extremely polluted aquatic media [9] [10]. Indeed, their ecological diversity is favor by their physiological adaptation to the high variability of the environmental factors of the medium such as salinity, acidity, the high thermal amplitudes and the dissolved oxygen fall [11].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Anthropogenic Pollution on the Abundance Dynamics of Some Freshwater Invertebrates in the Coastal Area of Cameroon

Koji¹,

Ewoti²,

Onana³

et al. 2017

JEP

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The abundance dynamic of some freshwater invertebrates in relation with the abiotic factors of the medium was studied from March 2013 to March 2014 on the main streams of the Wouri and Sanaga basins. Individuals of Copepoda, Atyidae, Chironomidae and Physidae were collected, identified and counted. Samplings were carried out monthly; meanwhile measurements of the environmental variables were taken. Results of the physico-chemical analyses revealed that water of the Sanaga basin is globally well oxygenated (77% -92%) and faintly mineralized (14 -107 µS/cm), excepted in the stations receiving household pollutants. Inversely, in the Wouri basin, waters are hypoxic with high content of organic matters (27.79 ± 9.43 mg/L). During rainy season (June-September), there is a dilution-dispersion of the organic matter due to stormwaters. Concerning biological analyses, the families of Physidae and Chironomidae were more abundant in urban stations than in stations situated in suburban area, especially during low water level period, showing that they are well adapted to anthropogenic and organic pollutions. The hypoxic conditions of urban waterways do not favor the proliferation of sensitive taxa such as Atyidae and Copepoda. These taxa preferred well oxygenated waters with rapid flow, and are more abundant during rainy season in stations located in suburban area or which are less subjected to anthropogenic disturbances.

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Section: Characteristic Of Environmental Variablessupporting

confidence: 94%

Section: Characteristic Of Environmental Variablessupporting

confidence: 89%

Section: Characteristic Of Environmental Variablessupporting

confidence: 88%

Section: Influence Of Environmental Factors On the Abundance Dynamic mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Anthropogenic Pollution on the Abundance Dynamics of Some Freshwater Invertebrates in the Coastal Area of Cameroon

Koji¹,

Ewoti²,

Onana³

et al. 2017

JEP

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DNA metabarcoding adds valuable information for management of biodiversity in roadside stormwater ponds

Sun

Majaneva

Sokolova

et al. 2019

Ecology and Evolution

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Stormwater ponds are used to compensate for the adverse effects that road runoff might have on the natural environment. Depending on their design and placement, stormwater ponds can act as both refugia and traps for local biodiversity. To evaluate the impact of stormwater ponds on biodiversity, it is critical to use effective and precise methods for identification of life associated with the water body. DNA metabarcoding has recently become a promising tool for identification and assessment of freshwater biodiversity. Using both morphology and DNA metabarcoding, we analyze species richness and biological composition of samples from 12 stormwater ponds and investigate the impact of pond size and pollution levels in the sediments and water column on the macroinvertebrate community structure. DNA metabarcoding captured and identified more than twice the number of taxa compared to morphological identification. The (dis)similarity of macroinvertebrate community composition in different ponds showed that the ponds appear better separated in the results obtained by DNA metabarcoding, but that the explained variation is higher for the results obtained by morphologically identification, since it provides abundance data. The reliance on morphological methods has limited our perception of the aquatic biodiversity in response to anthropogenic stressors, thereby providing inaccurate information for appropriate design and management of stormwater ponds; these drawbacks can be overcome by DNA metabarcoding. Synthesis and applications. The results indicate that DNA metabarcoding is a useful tool in identifying species, especially Diptera, which are difficult to determine. Application of DNA metabarcoding greatly increases the number of species identified at each sampling site, thereby providing a more accurate information regarding the way the ponds function and how they are affected by management. OPEN PRACTICES This article has earned an Open Data Badge for making publicly available the digitally‐shareable data necessary to reproduce the reported results. The data is available at https://www.ebi.ac.uk/ena/data/view/PRJEB30841.

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Functional relationship between woody plants and insect communities in response to Bursaphelenchus xylophilus infestation in the Three Gorges Reservoir region

Wang

Zhao

Liu

et al. 2021

Ecology and Evolution

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To study the effect of the invasion of Bursaphelenchus xylophilus on the functional relationship between woody plants and insect communities, the populations of tree species and insect communities were investigative in the Masson pine forests with different infestation durations of B. xylophilus . In this study, the number of Pinus massoniana began to decrease sharply, whereas the total number of other tree species in the arboreal layer increased gradually with the infestation duration of B. xylophilus . The principal component analysis ordination biplot shows that there was a significant change in the spatial distribution of woody plant species in different Masson pine forest stands. Additionally, a total of 7,188 insect specimens were obtained. The insect population showed an upward trend in stand types with the increase of pine wilt disease infection periods, which demonstrated that the insect community had been significantly affected by the invasion of B. xylophilus . However, the insect diversity indexes were not significantly different among Masson pine forest stands. The structure of insect functional groups changed from herbivorous (He) > omnivorous (Om) > predatory (Pr) > parasitic (Pa) > detritivorous (De) in the control stand to He > Pa > Om, De > Pr after B. xylophilus infestation in the forests. The results showed that the populations of He, Pa, and De increased after the invasion of B. xylophilus , but the populations of Pr decreased. Moreover, the redundancy analysis ordination biplots reflected the complicated functional relationship between woody plant communities and insects after the invasion of B. xylophilus . The present study provides insights into the changes in the community structure of woody plants and insects, as well as the functional relationship between woody plant communities and insect communities after invasion of B. xylophilus .

show abstract

Impact of urbanization on aquatic insect assemblages in the coastal zone of Cameroon: the use of biotraits and indicator taxa to assess environmental pollution

Cited by 33 publications

References 43 publications

Influence of Anthropogenic Pollution on the Abundance Dynamics of Some Freshwater Invertebrates in the Coastal Area of Cameroon

Influence of Anthropogenic Pollution on the Abundance Dynamics of Some Freshwater Invertebrates in the Coastal Area of Cameroon

DNA metabarcoding adds valuable information for management of biodiversity in roadside stormwater ponds

Functional relationship between woody plants and insect communities in response to Bursaphelenchus xylophilus infestation in the Three Gorges Reservoir region

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