The implications of vehicle collisions for the Endangered endemic Zanzibar red colobus<i>Piliocolobus kirkii</i>

Olgun, Harry; Mohammed, Mzee Khamis; Mzee, Abbas J.; Green, M. E. Landry; Davenport, Tim R.B.; Georgiev, Alexander V.

doi:10.1017/s0030605320000605

Cited by 9 publications

(7 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Other mitigations, such as signage and speed bumps, should be considered in urban areas under similar conditions. However, studies of their effectiveness for primates remain little studied as there are no qualitative analyses on signage to prevent primate‐vehicle collisions, and only one study on speed bumps (which found them effective) (Olgun et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

An effect of canopy bridges on monkey‐vehicle collision hotspots: Spatial and spatiotemporal analyses

Cunneyworth

Andrášik

Bíl

2023

American J Primatol

View full text Add to dashboard Cite

Almost one‐quarter of primate species are reported to be involved in vehicle collisions. To mitigate these collisions, canopy bridges are used though their effectiveness is not broadly substantiated. We studied bridge impact on 23 years of vehicle collisions (2000–2022: N = 765) with colobus (Colobus angolensis palliatus), Sykes' (Cercopithecus mitis albogularis), and vervet (Chlorocebus pygerythrus hilgerti) monkeys in Diani, Kenya. Along a 9 km road, collisions did not decrease over the study duration, although bridges increased from 8 to 30. Using the kernel density estimation plus (KDE+) method, collisions appeared highly concentrated at some locations. These concentrations, called hotspots, represent hazardous road segments, though the hotspots for all three species overlapped for only 3% of the road length. We then inspected the collision hotspots over time, using the spatiotemporal extension of the KDE+ method. We compared hotspot presence in the 3 years before and after bridge installation to determine if bridges mitigated these hotspots. Hotspots disappeared for ~60% of bridges postinstallation, suggesting that bridges effectively reduce some collisions. However, of the bridges installed in locations that were not hotspots, 13% had hotspots emerge. Surprisingly, regardless of preinstallation hotspot occurrence, almost one‐fifth of bridges had postinstallation hotspots. To understand the extent to which bridges mitigate collisions, other factors need consideration, including species attributes and crossing behavior, and road features and vehicle volume. We used the novel analytical method because it best suited our data set, given the challenges of determining the bridge impact zone and the low collision frequency.

show abstract

Section: Discussionmentioning

confidence: 99%

An effect of canopy bridges on monkey‐vehicle collision hotspots: Spatial and spatiotemporal analyses

Cunneyworth

Andrášik

Bíl

2023

American J Primatol

View full text Add to dashboard Cite

show abstract

“…6000 individuals, 50% of which are found at this national park (Davenport et al, 2019 ). The subjects of this study are exposed to high levels of habitat disturbance and human activity from roads, tourism, and nearby villages and farms (Georgiev et al, 2019 ; Olgun et al, 2021 ; Siex & Struhsaker, 1999 ). They do not receive provisioned food.…”

Section: Methodsmentioning

confidence: 99%

Methodological confounds of measuring urinary oxidative stress in wild animals

Melvin

Dhirani

Mitchell

et al. 2022

Ecology and Evolution

Self Cite

View full text Add to dashboard Cite

Biomarkers of oxidative stress (OS) are useful in addressing a wide range of research questions, but thus far, they have had limited application to wild mammal populations due to a reliance on blood or tissue sampling. A shift toward non‐invasive measurement of OS would allow field ecologists and conservationists to apply this method more readily. However, the impact of methodological confounds on urinary OS measurement under field conditions has never been explicitly investigated. We combined a cross‐sectional analysis with a field experiment to assess the impact of four potential methodological confounds on OS measurements: (1) time of sampling, (2) environmental contamination from foliage; (3) delay between sample collection and flash‐freezing in liquid nitrogen; and (4) sample storage of up to 15 months below −80°C. We measured DNA oxidative damage (8‐hydroxy‐2′‐deoxyguanosine, 8‐OHdG), lipid peroxidation (malondialdehyde, MDA), total antioxidant capacity (TAC), and uric acid (UA) in 167 urine samples collected from wild Zanzibar red colobus ( Piliocolobus kirkii ). We found that MDA was higher in samples collected in the morning than in the afternoon but there were no diurnal patterns in any of the other markers. Contamination of samples from foliage and length of time frozen at −80°C for up to 15 months did not affect OS marker concentrations. Freezing delay did not affect OS levels cross‐sectionally, but OS values from individual samples showed only moderate‐to‐good consistency and substantial rank‐order reversals when exposed to different freezing delays. We recommend that diurnal patterns of OS markers and the impact of storage time before and after freezing on OS marker concentrations be considered when designing sampling protocols. However, given the high stability we observed for four OS markers subject to a variety of putative methodological confounds, we suggest that urinary OS markers provide a valuable addition to the toolkit of field ecologists and conservationists within reasonable methodological constraints.

show abstract

“…Various strategies for mitigating WVCs are implemented across the globe and may include wildlife underpasses and bridges, fences, speed bumps to reduce traffic speed, and signage to warn drivers [91][92][93][94]. The effectiveness of a mitigation measure depends on a combination of variables, including the location, habitat type, road type, target species, and whether multiple strategies are implemented simultaneously [95].…”

Section: Mitigating Primate Roadkillmentioning

confidence: 99%

Road Infrastructure and Primate Conservation: Introducing the Global Primate Roadkill Database

Praill,

Eppley,

Shanee

et al. 2023

Animals

View full text Add to dashboard Cite

As road infrastructure networks rapidly expand globally, especially in the tropics, previously continuous habitats are being fragmented, resulting in more frequent wildlife–vehicle collisions (WVC). Primates are widespread throughout many sub-/tropical countries, and as their habitats are fragmented, they are increasingly at risk of WVC. We created the Global Primate Roadkill Database (GPRD), the largest available standardized database of primate roadkill incidents. We obtained data from published papers, un-published and citizen science databases, anecdotal reports, news reports, and social media posts. Here, we describe the collection methods for the GPRD and present the most up-to-date version of the database in full. For each primate roadkill incident, we recorded the species killed, the exact location, and the year and month the roadkill was observed. At the time of publication, the GPRD includes 2862 individual primate roadkill records from 41 countries. As primates range in more than twice as many countries, the absence of data from these countries is not necessarily indicative of a lack of primate vehicular collisions. Given the value of these data for addressing both local and global research questions, we encourage conservationists and citizen scientists to contribute to the GPRD so that, together, we can better understand the impact road infrastructure has on primates and evaluate measures which may help mitigate risk-prone areas or species.

show abstract

The implications of vehicle collisions for the Endangered endemic Zanzibar red colobusPiliocolobus kirkii

Cited by 9 publications

References 50 publications

An effect of canopy bridges on monkey‐vehicle collision hotspots: Spatial and spatiotemporal analyses

An effect of canopy bridges on monkey‐vehicle collision hotspots: Spatial and spatiotemporal analyses

Methodological confounds of measuring urinary oxidative stress in wild animals

Road Infrastructure and Primate Conservation: Introducing the Global Primate Roadkill Database

Contact Info

Product

Resources

About