Comparison of the density and species composition of aquatic invertebrates found between the roots of<i>Eichhornia crassipes</i>plants from two coastal lakes in northern KwaZulu-Natal

Viljoen, Awie; Cyrus, D. P.; Wepener, Victor

doi:10.2989/16085910109503725

Cited by 6 publications

(7 citation statements)

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“…Aside from providing a physical habitat for organisms, differences in invertebrate densities between artificial and natural substrata could be partly explained by increased food availability to grazers via growth of epiphytic algae (Carpenter & Lodge, 1986;Underwood & Thomas, 2006) or by protection of prey species from benthivorous fish, known to be present in the area (Hofman, 2007). Invertebrate densities in artificial plants, however, were comparable to densities seen in North Holland ditches in 1985 (when macrophytes were present) and within the ranges of those found in other lentic fresh waters with submerged macrophytes (Vijoen, Cyrus & Wepener, 2001;Storey, 2007;Verdonschot et al, 2011). Additionally, it takes time for periphyton communities to develop on Plastic Plants, and although the artificial substrata were left in the field for more than 50 days before sampling, we assume this food source is more readily available on natural vegetation.…”

Section: Consequences Of Submerged Macrophyte Loss For Benthic Invertsupporting

confidence: 69%

Macrophyte loss drives decadal change in benthic invertebrates in peatland drainage ditches

et al. 2013

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Summary Agricultural peatlands and their associated drainage systems are often highly managed and exposed to anthropogenic pressures, such as eutrophication and stable water tables, maintained via drainage during periods of high rainfall and inlet of, alkaline‐rich, waters during dry periods. These pressures promote peat degradation, resulting in the accumulation of fine‐degraded peat particles that dramatically alter aquatic habitats by smothering surfaces and decreasing water quality. Consequential effects on benthic communities are expected but have not been investigated so far. We hypothesised that peat degradation can lead to the decline in submerged macrophytes, which are of critical importance to sustaining biodiversity of benthic invertebrate communities. To investigate this, we analysed decadal (1985–2007) changes in benthic species richness in 29 peat ditches in the Netherlands and, to determine patterns of macroinvertebrate habitat occupancy, carried out a complementary field experiment with submerged artificial macrophytes, natural sediments and emergent bank vegetation. Results from long‐term monitoring indicate that chemical conditions in agricultural peat ditches have improved slightly over the last decades; however, there has been a simultaneous decline in benthic invertebrate species richness and densities corresponding to a decline in the numbers of submerged macrophytes. The apparent dependence of macroinvertebrates on macrophytes was reinforced by our field experiment which revealed that invertebrate density was highest in submerged artificial plants, while invertebrate species richness was highest in natural emergent vegetation. Conversely, degraded peat sediments supported extremely few invertebrates. Our results clearly illustrate the strong influence of submerged macrophyte loss on macroinvertebrate assemblages in peatland waters. Furthermore, this suggests that improvements in water quality alone will not benefit invertebrates in the absence of suitable vegetative habitats.

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Section: Consequences Of Submerged Macrophyte Loss For Benthic Invertsupporting

confidence: 69%

Macrophyte loss drives decadal change in benthic invertebrates in peatland drainage ditches

et al. 2013

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“…In total, 68 taxa belonging to 34 families were captured from the various samples, with an average density of 1644 ind./m 2 . The results of this study showed higher taxon richness (68 taxa recorded), compared with the study of Viljoen et al (2001) performed in two coastal lakes, Lakes Cubhu and Nsezi in northern KwaZulu-Natal (55 and 54 taxa reported respectively). On the other hand, Rocha-Ramírez et al (2007) found 96 invertebrate taxa in a study performed principally in brackish water systems, the Alvarado Lagoon System of Veracruz in Mexico.…”

Section: Discussioncontrasting

confidence: 54%

Aquatic macroinvertebrate assemblages associated with root masses of water hyacinths,Eichhornia crassipes(Mart.) Solms-Laubach, 1883 (Commelinales: Pontederiaceae) in Taabo Lake, Ivory Coast

Kouamé

Dietoa

Costa

et al. 2010

Journal of Natural History

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2010) Aquatic macroinvertebrate assemblages associated with root masses of water hyacinths, Eichhornia crassipes (Mart.) Solms-Laubach, 1883 (Commelinales:We examined aquatic macroinvertebrates associated with Eichhornia crassipes roots at five sampling sites in Taabo Lake. An average density of 1644 individuals (ind.)/m 2 was recorded. In total, 68 macroinvertebrate taxa belonging to 34 families and 14 orders were identified. Among these, Insecta was predominant (77.94%). The highest densities were recorded at Taabo cité during both rainy and dry seasons. Taxon diversity differences were not observed among all stations according to a Kruskal-Wallis test. High densities of predators were recorded. Next most prevalent in the trophic structure were detritivores. Indicator taxa analysis, using the Indval method, showed that stations upstream of the lake were characterized by eight taxa, while 11 appeared as indicators of the station near the dyke. Predators and herbivores dominated within those indicators. Sites near bays were distinguished by 18 indicator taxa with a predominance of predators and detritivores. Conductivity, NH 4 + , temperature, PO 4 3− , turbidity and dissolved oxygen were parameters that strongly influenced the macroinvertebrate community.

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“…Le choix porté sur ce macrophyte pour la récolte des macro-invertébrés est lié à son abondance dans les zones calmes et à la densité de son système racinaire qui peut être un habitat favorable pour ces êtres vivants aquatiques (Viljoen et al, 2001).…”

Section: Jacinthe D'eauunclassified

Premier inventaire des macro-invertébrés du fleuve Niger à Niamey comme bioindicateurs de la pollution urbaine et industrielle

et al. 2014

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Comparison of the density and species composition of aquatic invertebrates found between the roots ofEichhornia crassipesplants from two coastal lakes in northern KwaZulu-Natal

Cited by 6 publications

References 0 publications

Macrophyte loss drives decadal change in benthic invertebrates in peatland drainage ditches

Macrophyte loss drives decadal change in benthic invertebrates in peatland drainage ditches

Aquatic macroinvertebrate assemblages associated with root masses of water hyacinths,Eichhornia crassipes(Mart.) Solms-Laubach, 1883 (Commelinales: Pontederiaceae) in Taabo Lake, Ivory Coast

Premier inventaire des macro-invertébrés du fleuve Niger à Niamey comme bioindicateurs de la pollution urbaine et industrielle

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