Consequences of a terrestrial insect invader on stream-riparian food webs of the central Appalachians, USA

Diesburg, Kristen M.; Sullivan, Sean; Manning, David W. P.

doi:10.1007/s10530-020-02435-x

Cited by 2 publications

(4 citation statements)

References 113 publications

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“…Models with AICc < 2 were considered well supported and further assessed after excluding those models containing uninformative parameters (i.e., those whose addition to an existing model resulted in an improvement in AICc of < 2; Arnold, 2010). Within each model, we defined the cutoffs for a relationship as p < 0.05 and a trend as 0.05 < p ≤ 0.10 (Rowse et al, 2014;Diesburg et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

“…During 15-min surveys along 30 m (centered within the study reach), we visually inspected the streambank and immediate riparian zone for orb webs, counting the number of webs per m up to 2 m in height and 3 m landward from the streambank (Williams et al, 1995). Using orb webs as a 1:1 proxy for spiders is justified by the habits of tetragnathid spiders, which are known re-build their webs on a daily basis, making it possible to estimate the number of small, reclusive spiders by surveying the number of webs present at night, when these spiders are known to be most active (Williams et al, 1995;Diesburg et al, 2021). At each study reach, we also collected 7-12 tetragnathid spiders from orb webs for stable-isotope analysis (Akamatsu et al, 2004).…”

Section: Emergent Aquatic Insects and Orb-weaving Spidersmentioning

confidence: 99%

“…Both metrics allow for assessments of how stressors impact the basal energetic resources most important to and the structure (e.g., size and length) of the coupled terrestrial-aquatic food-web. For example, aquatically derived energy and TP of emergent aquatic insects have both been shown to be influenced by invasive vegetation in the riparian zone (Diesburg et al, 2021), while ecosystem size and hydrological disturbance have been shown to influence the ADE and TP of riparian spiders (Jackson and Sullivan, 2018), and riparian vegetation characteristics and urban development influence the ADE and TP of riparian ants (Tagwireyi and Sullivan, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Ecological Impacts of Altered Stream Hydrogeomorphic Characteristics Extend Beyond the Channel Boundary: Evidence From Urban Streams of Columbus, OH, United States

Rieck

Sullivan

2022

Front. Ecol. Evol.

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Urbanization in stream catchments can have strong effects on stream channel hydrogeomorphic features including channel dimensions, channel-floodplain connectivity, and flood regime. However, the consequences of hydrogeomorphic alterations on aquatic-terrestrial subsidy dynamics are largely unexplored. We examined the associations among hydrogeomorphic characteristics, emergent aquatic insect assemblages, and the density and trophic dynamics of riparian spiders of the family Tetragnathidae at 23 small urban stream reaches in the Columbus, OH (United States) Metropolitan Area. Naturally abundant stable isotopes of 13C and 15N were used to quantify the relative contribution of aquatically derived energy (i.e., nutritional pathways deriving from algae) to tetragnathid spiders and their trophic position. Bankfull discharge was negatively related to both emergence rate and family richness. On average, tetragnathid spiders relied on aquatically derived energy for 36% of their nutrition, with the greatest reliance found for spiders next to channels with wider flood-prone widths and proportionally fewer emergent insects of the family Chironomidae. Mean emergent aquatic insect reliance on aquatically derived energy was 32% and explained 44% of the variation in tetragnathid aquatically derived energy. A positive relationship between δ13C of tetragnathid spiders and emergent insects provides additional evidence of tetragnathid reliance on emergent insects. Mean tetragnathid trophic position was 2.85 and was positively associated with channel sinuosity and negatively associated with aquatic insect emergence rate. Sinuosity was also positively related to aquatically derived energy of emergent aquatic insects; as well as emergent insect family richness; % Ephemeroptera, Plecoptera, and Trichoptera (EPT); and aquatic insect emergence rate; implicating instream habitat-mediated shifts in emergent aquatic insect communities as an indirect mechanistic link between hydrogeomorphic processes and spiders. Our findings underscore that the impacts of stream hydrogeomorphic alterations can cascade into terrestrial food webs. These results suggest that monitoring and restoration of fluvial geomorphic form and function (e.g., sinuosity, slope, and hydrology) confer benefits to both aquatic and terrestrial riparian ecosystems in urban catchments.

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Section: Methodsmentioning

confidence: 99%

Section: Emergent Aquatic Insects and Orb-weaving Spidersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecological Impacts of Altered Stream Hydrogeomorphic Characteristics Extend Beyond the Channel Boundary: Evidence From Urban Streams of Columbus, OH, United States

Rieck

Sullivan

2022

Front. Ecol. Evol.

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“…The riparian biophysical structure and meteorological conditions may be more important for carabids in open habitats, where weak flying emergent insects can be transported further inland by the wind and land on the ground [71,72]. Though less studied, it was observed that the emergence strategy (from water or from land) of aquatic insects can also [9,25,33,[37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53]…”

Section: Acting Mechanismmentioning

confidence: 99%

Bridging the Gaps: Exploring Aquatic–Terrestrial Connectivity through the Trait-Based Ecology of Riparian Predatory Arthropods

Murgu,

Rîșnoveanu

2023

Water

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Riparian predatory arthropods represent one of the main trophic links between lotic and terrestrial ecosystems along riverine landscapes. The use of the trait-based approach promises to enhance our understanding of how these predatory communities interact with their environment through their response to various drivers of change and through their trophic interactions. We reviewed the scientific literature focused on the interaction between drivers of community change (natural and anthropogenic) and the functional traits and functional diversity components that characterize riparian ground beetles and spiders and, ultimately, on their role as cross-ecosystem trophic links. We highlight land use changes and river regulations as the strongest drivers that change the communities we study, often through various interacting mechanisms that favor the replacement of riparian specialists with generalist species, thus altering aquatic–terrestrial connectivity and the resilience of riverine arthropod consumers. Tropical regions and traits related to community responses to extreme climatic events (e.g., submersion tolerance and desiccation resistance) are less studied, while inconsistent patterns are noticed for well-studied traits, especially for spiders (e.g., their feeding preference response to aquatic subsidy availability and their body size response to flooding and bank hydrological connectivity). Future research should focus on the aforementioned drivers and knowledge gaps, along with the functional diversity changes in predatory arthropod communities along environmental and anthropogenic impact gradients, in order to improve riparian conservation.

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Consequences of a terrestrial insect invader on stream-riparian food webs of the central Appalachians, USA

Cited by 2 publications

References 113 publications

Ecological Impacts of Altered Stream Hydrogeomorphic Characteristics Extend Beyond the Channel Boundary: Evidence From Urban Streams of Columbus, OH, United States

Ecological Impacts of Altered Stream Hydrogeomorphic Characteristics Extend Beyond the Channel Boundary: Evidence From Urban Streams of Columbus, OH, United States

Bridging the Gaps: Exploring Aquatic–Terrestrial Connectivity through the Trait-Based Ecology of Riparian Predatory Arthropods

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