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To quantify the fish assemblage and its historical change, we conducted surveys in the Danjiangkou Reservoir in 2018 and 2019 based on multi-mesh gillnet samplings and catch by fisheries. A total of 33 fish species were collected, belonging to 5 orders, 11 families, and 29 genera, among which Cyprinidae were dominant, accounting for 63.6% of the total species captured. Spatial variation of diversity indices and catch per unit effort (CPUE, g•day −1 •m −2 ) based on gillnet samplings were calculated among sampling sites. Currently, the Danjiangkou Reservoir is dominated by sedentary, lentic, omnivorous and carnivorous fishes. Compared with historical data from the 1950s and 1980s, the number of total fish species in the reservoir increased and then subsequently decreased. Whereas the proportion of omnivorous species, lotic species, and migratory species showed a continuous decline. The similarity indices of species composition between the present and the 1950s and 1980s were 0.35 and 0.29, respectively (both medium dissimilarity). These results indicate that the current fish assemblage in the Danjiangkou Reservoir has undergone significant changes in the last half-century trending toward smaller species and simpler assemblages, which may be attributed to human activities such as dam construction, fish stocking, overfishing, and the introduction of non-native fish species.

Consumer Perceived Corporate Social Responsibility Authenticity (CPCSRA) belongs to the field of micro Corporate Social Responsibility (CSR) research. In general, understanding the formation mechanism of CPCSRA could make it better able to play its role in several ways. Firstly, most previous studies do not empirically consider a key factor, i.e., the consumer perceived senior managers’ involvement. We add this key factor into the independent variables of our formation mechanism. Secondly, most previous empirical research studies the relevant factors of consumer perceived CSR commitment as a whole. We study these relevant factors separately instead. Thirdly, we simultaneously choose the consumer perceived strategy-driven motive and consumer perceived value-driven motive as the mediating variables of our formation mechanism. Based on the above innovations, we comprehensively and systematically study the formation mechanism of CPCSRA. We use structural equation modeling to study the formation mechanism. For the convenience of data collection, our data are all from Chinese consumers. The study results show that three independent variables can directly affect CPCSRA. The three independent variables are consumer perceived level of invested resources, consumer perceived CSR efforts matching company and consumer perceived senior managers’ involvement. Consumer perceived senior managers’ involvement has the greatest effect. The two variables consumer perceived strategy-driven motive and consumer perceived value-driven motive play partial mediating effects on the relationship between independent variables and CPCSRA. Based on our empirical research, we put forward some feasible suggestions for company managers to increase company sustainability in market competition by promoting the formation of CPCSRA.

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