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• W2366157410 abstract "The study area is located at the south bank of the Changjiang estuary, China. In there, the changes of habitat conditions of the tidal flat wetland results in the differences of zoobenthic community structure and function along the estuarine gradients. In the study area we set seven transects , namely L (Liuhekou), G (Gaodong ), H (Heqin), C (Chaoyang), B (Binghai), D5 (5th dike of Donghai) and D7 (7th dike of Donghai). It extends about 100 km from transect L which is in the upper reaches of estuary to tansect D7 which is near the river mouth. Faunal samples consisted of 18 quadrats (25×25×20cm 3) at each transect. Samples were sieved through 1 0 mm stainless steel mesh. Macroinvertebrates founded were identified and counted. Based on the data collected from samplings in the south bank of the Changjiang estuary, we have categorized functional groups according to three aspects such as feeding types, mobility and food gathering techniques, so that if and how the estuarine environmental gradients are reflected in the zoobenthos is analyzed. A total of 55 species were identified, these zoobenthos were categorized 15 functional groups, which forming cline distribution pattern along longitudinal gradients of the south bank of the Changjiang estuary. There were zoogeographical pattern of zoobenthic species and functional groups which positively correlates with salinity gradient in the south bank of the Changjiang estuary. From the upper reaches to the lower reaches of the estuary along the environmental gradient, the number of zoobenthic species and functional groups increase gradually. There were 9 species of zoobenthos and 6 functional groups in the tidal flat of estuarine upper reaches respectively, and 42 species and 15 functional groups in the tidal flat of lower reaches respectively. In addition, the distribution pattern of zoobenthic species and functional groups along the estuarine gradient related to the width of tidal flat, habitat heterogeneity and primary productivity. There was difference in the dominant functional groups in various transects along estuarine gradient. The complex functional communities is located in the lower reaches of estuary in which there were various functional groups with different feeding types, mobility and food gathering techniques. Moreover, there were functional poor assemblages in the upper reaches of estuary and transect which was greatly polluted. Along estuarine gradient remarkable change reflects in a loss of sessile and tentaculate organisms from areas beyond Binghai transect towards the inner estuary. Those sessile and tentaculate organisms are sensitive to environmental disturbance, so they reflect the seasonal fluctuation of natural environmental factors such as salinity in the upper reaches of the Changjiang estuary is greater than that of the lower reach and the upper reach of the Changjiang estuary is disturbed strongly by human activities. This study suggests the basic zoobenthic community parameters were reflected in the composition and diversity of functional group. Condensing species diversity information into the analysis of the composition and diversity of functional group will helps to understanding the changes of ecological relationship underlying the complicate community changes which are reflected in a complex environmental gradients. Using the functional group approach, it is evident that the gradual shift in species composition is also reflected in some key functions, such as feeding types and mobility. In the every sampling transect along the estuarine gradient, the pattern of change in the total number of functional groups represents an integration of the responses of the major community parameters." @default.
• W2366157410 created "2016-06-24" @default.
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• W2366157410 date "2002-01-01" @default.
• W2366157410 modified "2023-09-28" @default.
• W2366157410 title "Distribution Pattern and Variation in the Functional Groups of Zoobenthos in the Changjiang Estuary" @default.
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