Intestinal microbiota responses to environmental microbiomes and factors across populations of the Manila clam Ruditapes philippinarum.

Intestinal microbiota is essential for the health, immune defense, and environmental adaptability of aquatic animals. Still, the interactions involving the intestinal microbiota of the Manila clam Ruditapes philippinarum, the microbiomes of their habitat, and environmental factors remain unclear. This study analyzed the microbial community structure and functional characteristics in clam intestine, water, and sediment across three distribution areas in Laizhou Bay (LZ), Jiaozhou Bay (JZ), and Sanggou Bay (SG) on the Shandong Peninsula, China.

Ocean acidification shifts carbonate chemistry heterogeneity in molluscan respiratory microenvironments.

Ocean acidification (OA) poses a threat to marine calcifiers by modifying carbonate chemistry in ambient seawater, where localized fluctuations exert more immediate physiological impacts than bulk seawater changes. We investigated the heterogeneity of carbonate chemistry parameters (pH, DIC, pCO₂, TA-DIC) within the respiratory microenvironments (RE) of four molluscan species (Mytilus galloprovincialis, Haliotis discus hannai, Chlamys farreri, Crassostrea gigas) under ambient (pH 8.1) and OA conditions (pH 7.

Assessment of Multifunctional Activity of a Postbiotic Preparation Derived from Postbiotic-P6.

Postbiotics possess various functional activities, closely linked to their source bacterial strains and preparation methods. Therefore, the functional activities of postbiotics need to be evaluated through in vitro and in vivo methods. This study aims to prepare a postbiotic and explore its antihemolytic, anti-inflammatory, antioxidant, and antibacterial activities.

Shellfish CO excretion is modulated by seawater carbonate chemistry but largely independent of pCO.

Four species of shellfish, blue mussel (Mytilus galloprovincialis), Pacific abalone (Haliotis discus hannai), zhikong scallops (Chlamys farreri), and Pacific oyster (Crassostrea gigas), were exposed to decoupled carbonate system variables to investigate the impacts of different seawater carbonate parameters on the CO excretion process of mariculture shellfish. Six experimental groups with two levels of seawater pH (pH 8.1 and pH 7.

The Application of the Generalized Additive Model to Represent Macrobenthos near Xiaoqing Estuary, Laizhou Bay.

Macrobenthos is widely used as an indicator of ecological health in marine monitoring and assessment. The present study aimed to characterize the interrelationships between the distribution of the macrobenthos community and environmental factors near Xiaoqing Estuary, Laizhou Bay. Responses of species richness to environmental factors were studied using the generalized additive model (GAM) and the Margalef diversity index () as indicators of species diversity instead of individual indicator species.

Influences of Substrate Grain Size on the Burrowing Behavior of Juvenile .

The substrate is the key environmental factor that affects the growth, survival, population and distribution of dwelling mollusks in mudflat settings. To clarify the effect of the substrate grain size on soft substrate preference, burrowing ability and behavior during the selection process of juvenile Meretrix meretrix, four different grain size substrates (coarse sand, medium sand, fine sand, and natural substrate) were set up for comparison. The results indicated that: (1) the burrowing ability of juvenile specimens in fine sand was the strongest; (2) the degree (from high to low) of the juvenile’s preference for the four substrates was in the order of fine sand > natural substrate > medium sand > coarse sand; and (3) the selection process of the substrate by the juveniles could be divided into four stages: preparation, selection, burrowing and end stages.