Temporal Dynamics and Structural Composition of Macroinvertebrate Communities in Intermittent Lowland Streams of Hungary

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dc.contributor.advisorNyeste, Krisztián
dc.contributor.authorReyad, Abdulrahman
dc.contributor.departmentDE--Természettudományi és Technológiai Kar--Biológiai és Ökológiai Intézet
dc.date.accessioned2024-06-17T11:29:09Z
dc.date.available2024-06-17T11:29:09Z
dc.date.created2024-04-29
dc.description.abstractWe aimed to investigate whether there was time sharing of macroinvertebrate communities in our study streams during the wet phase (Q1 & H1). Furthermore, we explored whether there was dominance of specific groups and evenness within these communities (Q2 & H2). Also, if these communities exhibited homogenization during the wet phase. The study used a combination of field sample collection, laboratory sorting, and taxonomic identification to collect data on macroinvertebrate communities in different seasons and hydrological phases (flowing and pool phase). The study also used Ecological Quality Ratio (EQR), Evenness, Dominance, Richness, Abundance, and Shannon Index metrics to assess the ecological status and diversity of the streams. For the statistical analysis, we used the program R (please check the right name for the R) Q1: Does the community structure of macroinvertebrates in lowland streams exhibit temporal diversity? H1: Intermittent streams characterized by time-sharing communities also in the lowland. We detected time-sharing communities in lowland streams, but the Létai-ér showed the lowest sharing community. Furthermore, the study revealed significant dissimilarities (F=3.526, p=0.0001) by PERMANOVA pairwise comparisons among stream communities. However, PERMANOVA analysis did not reveal significant disparities in other metrics like dominance, Shannon diversity index, and Ecological Quality Ratio (EQR). Q2: Are the communities in our study streams taxonomically homogenized and characterized by the dominance of specific macroinvertebrate groups? H2: The communities in our study streams are not taxonomically homogenized but are characterized by the dominance of certain macroinvertebrate groups. We partially supported our hypothesis; we detected dominated communities but not in all streams; where the dominance was detected, it was continuously stable. For example, the Létai-ér had stable dominance and variable evenness, while Brassó-ér and Barát-ér showed fluctuations in both dominance and evenness. The taxonomically homogenized streams were not established because these streams changed between the dominated and homogenized communities within a year. Additionally in the dominated communities the Gastropoda was as the higher rate group, besides these the Coleoptera, Gastropoda exhibited the highest species richness. Crustacea, Gastropoda, and Coleoptera were also consistently detected in most of the sampling events. The study found that water level fluctuation influenced macroinvertebrate communities' evenness, diversity, and dominance in different streams and sampling events. In the sampling sites the “BAR” site had the highest EQR values and species diversity, while the “VID” site had the lowest. As the least drought waterbody was dominated, the intermittency plays a significant role in shaping the dynamics of macroinvertebrate communities, so the sampling period is important because the sampling events were shown varying metrics values. Replicates are needed to confirm the study results. This study explored the influence of the wet phase on the structure and diversity of macroinvertebrate communities in five lowland intermittent rivers (IS) in Hungary. The research aimed to address a knowledge gap in understanding the ecology and biodiversity of these ecosystems and to offer practical insights for their conservation and management and suggested that future research should focus on hydrological phases of these ecosystems including more sampling events and use adapted indices for IS.
dc.description.courseHydrobiology and Water Quality Management
dc.description.degreeMSc/MA
dc.format.extent45
dc.identifier.urihttps://hdl.handle.net/2437/373115
dc.language.isoen
dc.rights.accessHozzáférhető a 2022 decemberi felsőoktatási törvénymódosítás értelmében.
dc.subjectIntermittent streams, Macroinvertebrates, Climate change, Biodiversity, Lowland
dc.subject.dspaceEnvironmental Science
dc.titleTemporal Dynamics and Structural Composition of Macroinvertebrate Communities in Intermittent Lowland Streams of Hungary
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