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Biology subjects

Tweedt, I.

Publications and source records attributed to Tweedt, I..

2 recordsLinked to original sources

Live-trapping of rodents in urban green spaces across Los Angeles

Urban green spaces have the potential to function as multi-benefit spaces, for both human enjoyment and sustaining native wildlife populations. In our study, we trapped for small nocturnal mammals across a series of Los Angeles green spaces. Our results show that native rodents are only present in habitats that support native vegetation; in particular we highlight the native rodent biodiversity on Sage Hill, a coastal sage scrub remnant on the UCLA campus. Other urban parks that are composed of non-native grasses and non-native shrubbery yielded only invasive species of rodents, including Brown Rats (Rattus norvegicus) and House Mice (Mus musculus). Our study points to the ability of renovated green space in Los Angeles to support native fauna. In addition, our study demonstrates some of the difficulties in doing trapping studies in heavily urbanized environments.

ecology↗

Pathogenic Leptospira are widespread in the urban wildlife of southern California

Leptospirosis is the most widespread zoonotic disease in the world, yet it is broadly understudied in multi-host wildlife systems. Knowledge gaps regarding Leptospira circulation in wildlife, particularly in densely populated areas, contribute to frequent misdiagnoses in humans and domestic animals. We assessed Leptospira prevalence levels and risk factors in five target wildlife species across the greater Los Angeles region: striped skunks (Mephitis mephitis), Northern raccoons (Procyon lotor), coyotes (Canis latrans), Virginia opossums (Didelphis virginiana), and fox squirrels (Sciurus niger). We sampled more than 960 individual animals, including over 700 from target species in the greater Los Angeles region, and an additional 260 sampled opportunistically from other regions and species. In the five target species, seroprevalences ranged from 5-60% and active infection prevalences ranged from 0.8-15.2% in all except fox squirrels (0%). Patterns of serologic reactivity suggest that mainland terrestrial wildlife, particularly mesocarnivores, could be the source of repeated observed introductions of Leptospira into local marine and island ecosystems. Overall, we found evidence of widespread Leptospira exposure in wildlife across Los Angeles and surrounding regions. This indicates exposure risk for humans and domestic animals and highlights that this pathogen can circulate endemically in many wildlife species even in densely populated urban areas.

ecology↗