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Plain Language Summary: Peer review is the key process through which every paper submitted to Tectonics is vetted, ensuring that each publication maintains the highest standards of scientific rigor and integrity. We depend on, and are grateful to, all of the volunteer peer reviewers who have devoted their time and considerable efforts toward this essential procedure. In 2021, the 186 papers published in Tectonics benefited from 844 reviews provided by 579 reviewers. On behalf of the entire editorial board of Tectonics, we want to express here our most heartfelt gratitude to all of you. Thank you! Key Point: The editors thank the reviewers of papers submitted in 2021 [ABSTRACT FROM AUTHOR]

This is the first systematic assessment conducted on fouling communities to determine the current status of six non-native marine invertebrates that were first recorded in Hong Kong three decades ago. They include the solitary ascidian, Ciona intestinalis; the slipper limpet, Crepidula onyx; the bryozoan, Bugula californica; the Caribbean bivalve, Mytilopsis sallei; the Mediterranean mussel, Mytilus galloprovincialis; and the boring isopod, Sphaeroma walkeri. Field surveys were conducted at 31 locations during wet (2011) and dry (2012) seasons and included fouling communities on piers and mariculture zones from estuarine to oceanic zones. The sampling was conducted by using photo-quadrats, destructive quadrats and field observations. To detect temporal changes in the abundance and recruitment of the sedentary non-native species, three piers were monitored with permanent photo-quadrats and recruitment panels for a one year period. We examined the relationship between seawater quality data available for Hong Kong and the abundances of fouling and non-native species. Only four of the six target non-native species were recorded in this survey. The isopod Sphaeroma walkeri was common and widely distributed in fouling communities in Hong Kong, while Ciona intestinalis, Crepidula onyx, and Mytilopsis sallei were uncommon and mainly restricted to areas with intensive human activities and poor seawater quality. These findings suggest that near shore human activities and poor water quality could increase the risk of establishment of non-native species in Hong Kong's marine fouling communities. [ABSTRACT FROM AUTHOR]