Effects of Habitat Types on Macroinvertebrates Assemblages Structure: Case Study of Sun Island Bund Wetland

Abstract

Sun Island Bund Wetland (SIBW) is a river floodplain wetland located at the south part of Heilongjiang Province in Northeast China. An investigation of the influence of habitat type on macroinvertebrates assemblages structure was conducted in July 2016. Nine (9) sampling sites were selected based on sediment type, water condition, and aquatic vegetation type. Macroinvertebrates attributes including density, biomass, and four diversity indices (Simpson diversity index, Margalef richness index, Shannon-Weiner index, and Pielou evenness index) were assessed. A total of 53 taxa were collected during the study period, with the highest density dominated being from aquatic insects and gastropods. Bellamya purificata and Exopalaemon annandalei were the most dominant among all the species. The results showed that the assemblages structure of macroinvertebrates in different habitats was significantly different. Also, the results with PCA showed that the higher values of invertebrates density, biomass, diversity indices, and species richness had a greater association with the habitat types of silt-humus sediment, closed lentic area, and submerged-flouting-emergent vegetation.

The influence of substrate type on macroinvertebrate assemblages within agricultural drainage ditches

“…These differences probably reflect increasing structural complexity of substrates, with artificial vegetation providing a greater number of feeding opportunities relative to the fine-grained monogenic substrates. Specifically macrophytes may (1) act as a direct food source or enable colonisation by epiphytic algae (Paice et al, 2017;Wolters et al, 2018a); (2) provide a more stable substrate (not prone to burial; Brookes, 1986;Cotton et al, 2006); (3) provide opportunities for filtering taxa to gain access to and protection from areas of high flow velocity within the channel (Phiri et al, 2011;Wolters et al, 2018b) and (4) provide a higher density of prey for predatory taxa than is available in benthic habitats (Khudhair et al, 2019). These feeding mode differences are reflected in our findings, with artificial macrophyte fronds being characterised by G. pulex, A. aquaticus and several algal grazing gastropods, whereas minerogenic substrates were characterised by burrowing taxa such as S. lutaria (Linnaeus, 1758) and Sphaeriidae.…”

Relationship between phytoplankton community structure and environmental factors in Yinchuan City water

“…Statistical analysis of plankton community structure in the Diannong River (Yinchuan City section), Yuehai Wetland, Baohu Wetland, and Hequanhu Wetland. The density and dominant species were analyzed using Excel 2021 [15]. The formula for dominant species is as follows:…”

Simulated effects of streambed vegetation on river hydraulics and the habitat suitability of freshwater macroinvertebrates

“…Based on the results of this study, and in accordance with previous literature, we could conclude that appropriate management of streambed vegetation would require: (1) accurately planned removal/clearance of streambed vegetation patches in areas prone to flooding; this would locally reduce water depths (by up to 40% as evident from our results), but would increase flow velocities (by up to 34% in our particular case study) (Bronte, 2013;Benifei et al, 2015); (2) accurately planned restoration of streambed vegetation in non-flooding (wider) areas to enhance geomorphic stability (Admiraal, 2007), and habitat suitability, diversity and quality (Huttunen et al, 2017;Khudhair et al, 2019) by locally increasing water depths and reducing flow velocities. Ecohydraulic models can be of valuable help to both ends, and could be case-specifically applied to inform accurate management practices regarding the removal or restoration of streambed vegetation.…”