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Hodges, C. W.

Publications and source records attributed to Hodges, C. W..

2 recordsLinked to original sources

Malayan kraits (Bungarus candidus) show affinity to anthropogenic structures in a human dominated landscape

Animal movement can impact human-wildlife conflict through a variety of features: increased movement can lead to greater chance of encounter, remaining still can lead to greater or lesser detection, and activity can modulate their impact on humans. Here we assess the movement and space use of the highly venomous and medically important Malayan krait (Bungarus candidus) on a suburban university campus. We radio- tracked 14 kraits for an average of 114 days (min: 19, max: 218), with an average of 106 fixes (min: 21, max: 229). We assessed movement pathways and activity with dynamic Brownian Bridge Movement models, evaluated patterns of revisitation to identify site fidelity, and determined whether individuals selected for particular land-use types with Integrated Step Selection Functions. Most individuals displayed some level of attraction to buildings (n = 10) and natural areas (n = 12); we identified a similar unambiguous pattern of attraction to buildings and natural areas at the population level (of our sample). Snakes remained in shelter sites for long periods of time (max = 94 days) and revisited sites on average every 15.45 days. Over 50% of fixes were within human settlements and 37.1% were associated with buildings. We found generally seasonal patterns of activity, with higher activity in wet seasons (when classes are typically in session on campus), and lower activity in the hot season (when there are a number of short breaks causing students to leave campus). These results show frequent proximity between Malayan kraits and humans at Suranaree University of Technology, Thailand; thereby, suggesting a near constant potential for human- wildlife conflict. Despite the fact that no snakebites from this species occurred at the university during our study period, substantial education and awareness training should be considered to raise awareness to ensure continued coexistence on campus.

ecology↗

No room to roam: King Cobras reduce movement in agriculture

Studying animal movement provides insights into how animals react to land-use changes, specifically how animals can change their behaviour in agricultural areas. Recent reviews show a tendency for species to reduce movements in response to increased human landscape modification, but the study of movement has not been extensively explored in reptiles. We examined movements of a large reptilian predator, the King Cobra (Ophiophagus hannah), in Northeast Thailand. We used a consistent regime of radio-telemetry tracking to document movements across protected forest and adjacent agricultural areas. We then adapted GPS-targeting analytic methods to examine the movement using metrics of site reuse and dynamic Brownian Bridge Movement Model derived motion variance. Examination of motion variance demonstrated that King Cobra movements increased in forested areas and tended to decrease in agricultural areas. Our Integrated Step-Selection Functions indicated that when moving in agricultural areas King Cobras restricted their movements, thereby remaining within vegetated semi-natural areas, often located along the banks of irrigation canals. Site reuse metrics of residency time and number of revisits remained unaffected by distance to landscape features. Neither motion variance nor reuse metrics were consistently affected by the presence of threatening landscape features (e.g. roads, human settlements); suggesting that King Cobras will remain in close proximity to threats, provided habitat patches are available. Although King Cobras displayed heterogeneity in their response to agricultural landscapes, the overall trend suggested a reduction in movements when faced with fragmented habitat patches embedded in an otherwise inhospitable land-use matrix. Reductions in movements are consistent with findings for mammals and forest specialist species.

ecology↗