Laurino Ivan R A, Checon Hélio H, Corte Guilherme N, Turra Alexander
Oceanographic Institute, University of São Paulo (USP), Praça do Oceanográfico, 191, CEP: 05508-120, São Paulo, SP, Brazil.
Oceanographic Institute, University of São Paulo (USP), Praça do Oceanográfico, 191, CEP: 05508-120, São Paulo, SP, Brazil; Department of Animal Biology, State University of Campinas (UNICAMP), Rua Monteiro Lobato, 255, 13083-862, Campinas, SP, Brazil.
Mar Environ Res. 2022 Nov;181:105760. doi: 10.1016/j.marenvres.2022.105760. Epub 2022 Sep 28.
Sandy beaches are increasingly squeezed due to the construction of backshore man-made structures (i.e., coastal armoring) and current global changes. Coastal armoring impacts beach sediment dynamics, inducing erosion and habitat loss, threatening biodiversity processes and the functional roles of sandy beach organisms. Here, we examine how the abundance, taxonomic richness, and functional richness of sandy beach fauna are affected by coastal armoring. We compared macrobenthic infaunal communities on five armored beaches (with backshore urban structures) and five vegetated beaches (not-armored). We also evaluated the abundance and biomass of upper-beach arthropods using pitfall traps, comparing armored and vegetated segments within the beaches. Infaunal richness and abundance were lower at armored beaches, mainly in the subtidal zones, because of a reduction in polychaete and molluscan abundance. There was no difference in overall functional richness between the armored and vegetated beaches. Nevertheless, we found that functional groups such as small suspension feeders were more associated with armored beaches, while large-bodied species and predators were more frequent at vegetated beaches. Pitfall traps showed that coastal armoring also reduced the abundance of the upper-beach coleopteran Phaleria testacea, leading to a loss of biomass. Therefore, our data suggest that coastal armoring can influence the functional composition of sandy beach biodiversity and significantly impact macrobenthic abundance and biomass.
由于后滨人工建筑（即海岸防护设施）的建设以及当前的全球变化，沙滩正日益受到挤压。海岸防护设施影响沙滩沉积物动态，引发侵蚀和栖息地丧失，威胁生物多样性进程以及沙滩生物的功能作用。在此，我们研究海岸防护设施如何影响沙滩动物群的丰度、分类丰富度和功能丰富度。我们比较了五个有防护设施的海滩（有后滨城市建筑）和五个植被丰富的海滩（无防护设施）上的大型底栖动物群落。我们还使用陷阱诱捕器评估了海滩上部节肢动物的丰度和生物量，比较了海滩内有防护设施和植被丰富的区域。由于多毛类动物和软体动物丰度的减少，有防护设施的海滩上的底栖动物丰富度和丰度较低，主要是在潮下带。有防护设施的海滩和植被丰富的海滩在总体功能丰富度上没有差异。然而，我们发现小型悬浮取食者等功能群与有防护设施的海滩关联更大，而大型物种和捕食者在植被丰富的海滩更为常见。陷阱诱捕器显示，海岸防护设施也减少了海滩上部鞘翅目昆虫海滨角甲的丰度，导致生物量损失。因此，我们的数据表明，海岸防护设施会影响沙滩生物多样性的功能组成，并显著影响大型底栖动物的丰度和生物量。
