Two-year study of food availability, demographic structure, and genetic diversity of the most common sandhopper in southeastern Brazil

Weber, Laura; Barbosa, Thais Porto; Beraldini, Nathalia Goulart; Silva, Viviane da Conceição

doi:10.1016/j.rsma.2019.100876

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…High abundances of A. brasiliensis could be attributed to the conserved vegetation in some of these beaches since beaches that present shoreline armoring has a lower abundance of talitrids (Sobocinski et al, 2010;Dugan et al, 2008). Increases in A. brasiliensis demographic parameters, such as density, size, and biomass, are all correlated with beach vegetal availability (Weber et al, 2019). Also, visitation in these habitats is not as constant as in urbanized beaches and tends to increase only on weekends and holidays.…”

Section: Discussionmentioning

confidence: 99%

Local urbanization impacts sandy beach macrofauna communities over time

et al. 2023

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Sandy beaches are ecologically important, physically dynamic, and heterogeneous habitats intrinsically related to human culture. However, these interactions present challenges for sandy beaches in the Anthropocene as stressors from urbanization increase. This study investigated sandy beach community responses to local urbanization in two periods. Beaches were classified into three urbanization categories: conserved (C), modified (M), and urbanized (U), and compared temporally (1997/1998 – first period; 2012 – second period). We hypothesized that community structure descriptors (total abundance, biomass, and richness) and bioindicator abundance (Emerita brasiliensis and Atlantorchestoidea brasiliensis) decreased temporally and be lower in urbanized beaches. The results partially corroborate the main hypothesis since there were different temporal responses from biological variables between each urbanization category (C, M, and U). The data supported that community structure descriptors decreased as local urbanization increased between categories (C, M, and U). Conserved beaches (C) presented higher values for community descriptors, and populations of E. brasiliensis and A. brasiliensis were more abundant compared to other groups (M and U). Modified beaches (M) presented resilience to local urbanization pressures since they are recently urbanized habitats, and some beaches are inside protected areas. The urbanized beaches (U) were impacted by the long-term pressures of urbanization and recreation, and community descriptors and bioindicators presented the lowest values in both periods. Species undergoing direct development, such as A. brasiliensis, should preferably be used as indicators of temporal changes due to local urbanization on sandy beaches, rather than indirect developers like E. brasiliensis. Identifying suitable indicators for long-term anthropogenic impacts from increasing urbanization is necessary for protecting sandy beach ecology.

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Section: Discussionmentioning

confidence: 99%

Local urbanization impacts sandy beach macrofauna communities over time

et al. 2023

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Towards the understanding of genetic and morphological variations of a highly abundant seaweed-associated marine invertebrate

Longo,

Azevedo-Silva,

Mansur

et al. 2024

Estuarine, Coastal and Shelf Science

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The role of inputs of marine wrack and carrion in sandy‐beach ecosystems: a global review

et al. 2022

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Sandy beaches are iconic interfaces that functionally link the ocean with the land via the flow of organic matter from the sea. These cross-ecosystem fluxes often comprise uprooted seagrass and dislodged macroalgae that can form substantial accumulations of detritus, termed 'wrack', on sandy beaches. In addition, the tissue of the carcasses of marine animals that regularly wash up on beaches form a rich food source ('carrion') for a diversity of scavenging animals. Here, we provide a global review of how wrack and carrion provide spatial subsidies that shape the structure and functioning of sandy-beach ecosystems (sandy beaches and adjacent surf zones), which typically have little in situ primary production. We also examine the spatial scaling of the influence of these processes across the broader land-and seascape, and identify key gaps in our knowledge to guide future research directions and priorities. Large quantities of detrital kelp and seagrass can flow into sandy-beach ecosystems, where microbial decomposers and animals process it. The rates of wrack supply and its retention are influenced by the oceanographic processes that transport it, the geomorphology and landscape context of the recipient beaches, and the condition, life history and morphological characteristics of the macrophyte taxa that are the ultimate source of wrack. When retained in beach ecosystems, wrack often creates hotspots of microbial metabolism, secondary productivity, biodiversity, and nutrient remineralization. Nutrients are produced during wrack breakdown, and these can return to coastal waters in surface flows (swash) and aquifers discharging into the subtidal surf. Beach-cast kelp often plays a key trophic role, being an abundant and preferred food source for mobile, semi-aquatic invertebrates that channel imported algal matter to predatory invertebrates, fish, and birds. The role of beach-cast marine carrion is likely to be underestimated, as it can be consumed rapidly by highly mobile scavengers (e.g. foxes, coyotes, raptors, vultures). These consumers become important vectors in transferring marine productivity inland, thereby linking marine and terrestrial ecosystems. Whilst deposits of organic matter on sandy-beach ecosystems underpin a range of ecosystem functions and services, they can be at variance with aesthetic perceptions resulting in widespread activities, such as 'beach cleaning and grooming'. This practice diminishes the energetic base of food webs, intertidal fauna, and biodiversity. Global declines in seagrass beds and kelp forests (linked to global warming) are predicted to cause substantial reductions in the amounts of marine organic matter reaching many beach ecosystems, likely causing flow-on effects for food webs and biodiversity. Similarly, future sea-level rise and increased storm frequency are likely to alter profoundly the physical attributes of beaches, which in turn can change the rates at which beaches retain and process the influxes of wrack and animal carcasses. Conservation of the multi-faceted eco...

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Two-year study of food availability, demographic structure, and genetic diversity of the most common sandhopper in southeastern Brazil

Cited by 3 publications

References 35 publications

Local urbanization impacts sandy beach macrofauna communities over time

Local urbanization impacts sandy beach macrofauna communities over time

Towards the understanding of genetic and morphological variations of a highly abundant seaweed-associated marine invertebrate

The role of inputs of marine wrack and carrion in sandy‐beach ecosystems: a global review

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