posted on 2025-08-22, 15:24authored byStacy PhilpottStacy Philpott, Peter Bichier, Robyn Fowler, Shalene Jha, Heidi Liere, Brenda B. Lin
<p dir="ltr">Agroecosystem management at microhabitat, habitat, and landscape scales shapes natural enemy communities, with critical implications for ecosystem services. Yet few studies examine the impacts of small to large scale habitat management features on predator communities, abundance of predator species, or removal of prey items from urban agroecosystems. In this study, we used observations and a sentinel prey removal experiment to examine the impact of substrate (prey placed on the ground vs. on kale plants), microhabitat (prey placed under vegetation, on bare soil in open areas, or on mulch in open areas), local garden management features, and landscape features on predator species composition and removal of two prey species in urban gardens in the California central coast. We found that both microhabitat characteristics and substrate type shaped prey removal rates within urban gardens, and microhabitat, but not substrate, impacted predator species composition. In addition, both garden management (floral abundance, herbaceous plant richness, and tree and shrub abundance) and landscape features (urban land cover within 2 km) influenced prey removal and predator composition. Nearly all prey removal of eggs was accomplished by ants; larvae predators were more diverse and included ants, birds, lizards, wasps, and spiders. Although predator composition was mediated by many habitat features, prey removal was greater under vegetation, from the ground, when floral abundance in gardens was high, and in gardens with fewer trees and shrubs. Considering how these different management features affect predator foraging behavior and interactions will be a promising next step in this field.</p><p dir="ltr">A description of the variables for data collected (egg removal, larvae removal, egg predators and larvae predators) is provided in the 'metadata' tab.</p>
Funding
Ecological Networks, Management Shifts, and Ecosystem Services In Urban Agricultural Landscapes
In this study, our overall goal was to determine the identity of predator species actively preying upon sentinel prey in urban agroecosystems and quantify how predator abundance and prey removal activities differ depending on garden management. Specifically, we asked (1) How do the substrate on which the prey are located (on the ground or on vegetation), microhabitat (under vegetation, in open areas with mulch, and in open areas with bare soil), local (garden-scale) and landscape factors, and predator abundance, influence removal rates of two sentinel prey species within urban agroecosystems? and (2) How does the abundance and species composition of predators removing the sentinel prey species differ across the same suite of multi-scalar habitat
factors?
Temporal Extent Start Date
2022-07-01
Temporal Extent End Date
2022-08-01
Theme
Not specified
Geographic location - description
Santa Clara County, California, USA
Santa Cruz County, California, USA
Monterey County, California, USA