Abstract
Given the biogeochemical functions of marine microbes, the structure and functional diversity of bacterioplankton communities could be regarded as bioindicators that reflect environmental quality. The habitat of the large yellow croaker (Pseudosciaena crocea) is suffering from widespread degradation, but the study of croaker habitat is still insufficient. Here, we used 16S rRNA gene sequencing and functional prediction to investigate the surface bacterioplankton communities in an overwintering ground of P. crocea during the overwintering period (November 2018 to April 2019). Our results showed that the taxa and functions of the environmental bacterioplankton community exhibited obvious seasonality. Specifically, the bacterioplankton communities in autumn were characterized by animal parasites or symbionts, such as Acinetobacter baumannii and Moraxella, while organic substance-degrading bacteria, such as Rhodococcus, Stenotrophomonas and Alcanivorax, dominated in spring. Moreover, phylogenetic-based mean nearest taxon distance (MNTD) analyses indicated that dispersal limitation was the most important process governing the spatiotemporal assembly of the bacterioplankton communities. The distance decay of similarity also suggested the impact of dispersal limitation on the generation of biogeographical patterns. Furthermore, variation partitioning analysis and a partial Mantel test revealed that environmental filters, such as nutrients, temperature and salinity, had relatively weak deterministic effects on the bacterioplankton community assembly. Overall, these findings provide a basis for understanding the theory of surface microbial community assembly in the overwintering habitat of the large yellow croaker.
Highlights
Abundant fisheries resources are indispensable cornerstones for the sustainable development of the coastal economy (Tursi et al, 2015; Keen et al, 2018)
A fraction of pairwise |β-nearest taxon index (βNTI)|
The failed recovery of the common snook (Centropomus undecimalis) indicates that habitat degradation is considered more significant than exploitation in explaining population declines (Brennan et al, 2008), which indicates the need for the study and restoration of croaker habitat
Summary
Abundant fisheries resources are indispensable cornerstones for the sustainable development of the coastal economy (Tursi et al, 2015; Keen et al, 2018). The Chinese government has implemented a series of strict fishing moratoriums and stock management systems since 1995, and the current status of most natural resources has generally improved. Despite all these programs, the wild stocks of large yellow croaker (Pseudosciaena crocea), which is known as China’s national fish, have not recovered (Liu and de Mitcheson, 2008). Evidence strongly suggests that coastal pollution, habitat degradation, and possible ecosystem changes may have compromised the potential for stock recovery (Liu and de Mitcheson, 2008). Because the low temperature may suppress croaker immune functions by influencing multiple physiological processes and thereby make the croaker susceptible to the surrounding environment (Yang et al, 2015; Liu et al, 2019), the habitat conditions of their overwintering grounds are vital for recovering their stock and supporting this marine resource
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