Short-term extra food supply effects on detectability of two rodent species in Pampean agroecosystems, Argentina

Gorosito, Irene Laura; Bermúdez, Mariano Marziali; Benítez, Ailén Marina; Busch, María

doi:10.1007/s13364-021-00612-4

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…This is to be expected, as g 0 is usually negatively correlated with the σ parameter (Royle et al., 2013 ). Individuals with a larger home range are less likely to be detected at a location at a given time, compared to individuals with a smaller home range (Gorosito et al., 2022 ). Whether the effects of anthropogenic resource supplementation or changes in the dingo breeding season are driving the changed ranging patterns of dingoes requires further study.…”

Section: Discussionmentioning

confidence: 99%

Population density and ranging behaviour of a generalist carnivore varies with human population

Alting,

Pitcher,

Rees

et al. 2024

Ecology and Evolution

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Canid species are highly adaptable, including to urban and peri‐urban areas, where they can come into close contact with people. Understanding the mechanisms of wild canid population persistence in these areas is key to managing any negative impacts. The resource dispersion hypothesis predicts that animal density increases and home range size decreases as resource concentration increases, and may help to explain how canids are distributed in environments with an urban‐natural gradient. In Australia, dingoes have adapted to human presence, sometimes living in close proximity to towns. Using a targeted camera trap survey and spatial capture‐recapture models, we estimated spatial variation in the population density and detection rates of dingoes on Worimi Country in the Great Lakes region of the NSW coast. We tested whether dingo home range and population densities varied across a gradient of human population density, in a mixed‐use landscape including, urban, peri‐urban, and National Park environs. We found human population density to be a strong driver of dingo density (ranging from 0.025 to 0.433 dingoes/km2 across the natural‐urban gradient), and to have a negative effect on dingo home range size. The spatial scale parameter changed depending on survey period, being smaller in the peak tourism period, when human population increases in the area, than in adjacent survey periods, potentially indicating reduced home range size when additional resources are available. Our study highlights the potential value of managing anthropogenic resource availability to manage carnivore densities and potential risk of human‐carnivore interactions.

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Section: Discussionmentioning

confidence: 99%

Population density and ranging behaviour of a generalist carnivore varies with human population

Alting,

Pitcher,

Rees

et al. 2024

Ecology and Evolution

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“…For example, detectabilities of Pacific rats (Rattus exulans) by live-traps were higher in winter (when food was scarce) than in autumn on Great Barrier Island (Gronwald and Russell 2020). Similarly, Gorosito et al (2022) reported a decrease in detectability of native Azara's grass mouse (Akodon azarae) by live-traps in Argentina after an artificial addition of food supply in the field, but the effect was species-specific and not found in yellow pygmy rice rat (Oligoryzomys flavescens).…”

Section: Introductionmentioning

confidence: 96%

“…Similarly, Gorosito et al . (2022) reported a decrease in detectability of native Azara’s grass mouse ( Akodon azarae ) by live-traps in Argentina after an artificial addition of food supply in the field, but the effect was species-specific and not found in yellow pygmy rice rat ( Oligoryzomys flavescens ).…”

Section: Introductionmentioning

confidence: 99%

Reliable detection of low-density Pacific rats by using camera trapping

2022

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Context Long-term monitoring is essential for control and eradication of invasive mammalian predators. Relative abundance indices are increasingly used when assessing population changes. However, indexing assumes constant detectability, when, in fact, it varies depending on numerous factors, including the type and spacing of monitoring devices, seasons, vegetation types, and inter- and intra-specific interactions. Aims We studied a population of Pacific rat (Rattus exulans) and examined the influence of vegetation types, seasons and inter-specific interactions on their detection. Methods We deployed tracking-tunnels, live-traps, chew cards, and trail cameras in three vegetation types during summer and winter. Detection rates of Pacific rats, mice (Mus musculus), stoats (Mustela erminea) and weka (Gallirallus australis) were calculated and compared among vegetation types, seasons and devices. Key results Pacific rats were not detected by any monitoring devices in the farmland, despite their presence in this habitat. In the forest and shrubland, cameras had the highest detection rate among all of the monitoring devices, whereas live-trap and chew cards failed to detect rats. Tracking tunnels detected Pacific rats only in the shrubland. Camera detections of Pacific rats were lower in winter than in summer, and detections were dominated by weka and stoats for both seasons. The seasonal effects may have reflected the population cycle of Pacific rats. Weka and stoats caused substantial physical interference to the tracking tunnels, live-traps and chew cards, which is likely to have deterred Pacific rat interactions through imposing high predation risks. Conclusions Cameras were the most effective device at detecting Pacific rats in low density and under high predator disturbances. Tracking tunnels and chew cards that are successful at detecting other Rattus spp. might not be reliable for detecting Pacific rats. Implications We recommend using camera monitoring for rodents where population density is low, or predator disturbance is high, and species are identifiable from pictures. Studies that draw inferences from relative abundance indices on rodents should exercise caution when rodent detectability is unknown.

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Could the detection of small rodents be improved? The case of Oligoryzomys flavescens, an orthohantavirus reservoir species, in a natural reserve immersed in an urban landscape

Pérez,

Suárez,

Tripodi

et al. 2024

Mamm Biol

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Short-term extra food supply effects on detectability of two rodent species in Pampean agroecosystems, Argentina

Cited by 3 publications

References 26 publications

Population density and ranging behaviour of a generalist carnivore varies with human population

Population density and ranging behaviour of a generalist carnivore varies with human population

Reliable detection of low-density Pacific rats by using camera trapping

Could the detection of small rodents be improved? The case of Oligoryzomys flavescens, an orthohantavirus reservoir species, in a natural reserve immersed in an urban landscape

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