A new general index of home range overlap and segregation: the Lesser Kestrel in Southern Italy as a case study

Ferrarini, Alessandro; Giglio, Giuseppe; Pellegrino, Stefania Caterina; Gustin, Marco

doi:10.1186/s40657-020-00240-7

Cited by 8 publications

(9 citation statements)

References 22 publications

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“…In our previous study [9], we found that the overlap among the minimum convex polygons of the lesser kestrels at Santeramo in Colle was 81.38%. In this study, using probabilistic home ranges, we found that the overlap figure stood at 94.016%.…”

Section: Discussionmentioning

confidence: 77%

“…In order to quantify probabilistic home range overlaps, we employed our probabilistic general overlap index (PGOI). The PGOI is a generalization of the general overlap index (GOI) [9] that allows for computation of overlap among an arbitrarily large number (n ≥ 2) of home ranges in polygon format. The GOI is calculated as…”

Section: Methodsmentioning

confidence: 99%

“…In the intermediate cases, 0 < GOI < 100. A general segregation index (GSI) [9] can also be computed as the complement to 100 of the GOI:…”

Section: Methodsmentioning

confidence: 99%

“…Percent overlap is a pairwise measure, and, as such, when the number of individuals, populations or species is elevated, the resulting overlap matrix is overlarge and thus difficult to interpret. Recently, this issue has been solved through a general overlap index (GOI hereafter) for the computation of the overlap of multiple polygon home ranges [9]. Whatever the number of home ranges in the polygon format, the GOI always returns a single score ranging in the [0, 100] interval.…”

Section: Introductionmentioning

confidence: 99%

“…We applied the PGOI and PGSI to five lesser kestrels (Falco naumanni) as a case study, in order to estimate within-colony overlap/segregation in the urban colony of Santeramo in Colle (Apulia region; Southern Italy). This was a good case study as this colony belongs to the geographical area (Alta Murgia) with the most elevated density of lesser kestrels in urban areas worldwide [9]. The lesser kestrel is a small insectivorous raptor present among Annex I species of EU Wild Birds Directive 2009/147/EEC, which breeds in steppe-like grasslands and non-irrigated arable crops [15].…”

Section: Introductionmentioning

confidence: 99%

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Measuring the Degree of Overlap and Segregation among Multiple Probabilistic Home Ranges: A New Index with Illustrative Application to the Lesser Kestrel Falco naumanni

Ferrarini

Giglio

Pellegrino

et al. 2021

Animals

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Home range overlap/segregation has several important applications to wildlife conservation and management. In this work, we first address the issue of measuring the degree of overlap/segregation among an arbitrarily large number (i.e., n ≥ 2) of probabilistic animal home ranges (i.e., utilization distributions). This subject matter has recently been solved for home ranges measured as polygons (e.g., percent minimum convex polygons and multinuclear cores) but not yet for probabilistic ones. Accordingly, we introduce a novel index named the PGOI (probabilistic general overlap index), and its complement, the PGSI (probabilistic general segregation index), an index for computation of probabilistic home range overlap/segregation at individual, population and species levels. Whatever the number of probabilistic home ranges, the PGOI returns a single score ranging in the [0, 100] interval. We applied the PGOI to five lesser kestrels (Falco naumanni) at Santeramo in Colle (Apulia region; Southern Italy) as a case study. Our new index can be applied to any animal species and to home ranges derived from any type of probabilistic home range estimator.

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Section: Discussionmentioning

confidence: 77%

Section: Methodsmentioning

confidence: 99%

“…In the intermediate cases, 0 < GOI < 100. A general segregation index (GSI) [9] can also be computed as the complement to 100 of the GOI:…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measuring the Degree of Overlap and Segregation among Multiple Probabilistic Home Ranges: A New Index with Illustrative Application to the Lesser Kestrel Falco naumanni

Ferrarini

Giglio

Pellegrino

et al. 2021

Animals

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Application of GPS occurrence data to understand African white‐backed vulturesGyps africanusspatial home range overlaps

Zvidzai

Zengeya

Masocha

et al. 2022

Ecology and Evolution

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Understanding key overlap zones and habitats which are intensively shared by species in space and time is crucial as it provides vital information to inform spatial conservation with maximum benefits. The advent of high‐resolution GPS technologies associated with new analytical algorithms is revolutionizing studies underpinning species spatial and social interaction patterns within ecosystems. Here, using a robust home range estimation algorithm, the autocorrelated kernel density estimator (AKDE) equipped with an equally powerful home range overlap metric, the Bhattacharyya's coefficient (BC), we provide one of the first attempts to estimate and delineate spatial home range overlap zones for critically endangered African white‐backed vultures to inform conservation planning. Six vultures were captured in Hwange National Park using a modified cannon net system after which they were tagged and tracked with high‐resolution GPS backpacks. Overall, results suggested weaker average home range overlaps based on both the pooled data (0.38 ± 0.26), wet non‐breeding seasonal data (0.32 ± 0.23), and dry breeding season data (0.34 ± 0.28). Vultures 4, 5, and 6 consistently revealed higher home range overlaps across all the scales with values ranging between 0.60 and 0.99. Individual vultures showed consistence in space use patterns as suggested by high between‐season home range overlaps, an indication that they may be largely resident within the Hwange ecosystem. Importantly, we also demonstrate that home range overlapping geographic zones are all concentrated within the protected area of Hwange National Park. Our study provides some of the first results on African vulture home range overlaps and segregation patterns in the savanna ecosystem based on unbiased telemetry data and rigorous analytical algorithms. Such knowledge may provide vital insights for prioritizing conservation efforts of key geographic overlap zones to derive maximum conservation benefits especially when targeting wide‐ranging and critically endangered African white‐backed vultures. To this end, spatial overlap zones estimated here, although based on a small sample size, could provide a strong foundation upon which other downstream social and ecological questions can be explored further to expand our understanding on shared space use mechanisms among African vulture species.

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An assessment of the contact rates between individuals when movement is modelled by a correlated random walk

Bailey

2023

Theor Ecol

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Understanding how individuals come into contact with each other is important in many fields from biology and ecology to robotics and physics. Interaction dynamics are central in understanding how information is spread between agents, how disease spreads through a population, and how group movement or behaviour occurs. However, in many applications, the underlying mode of movement is not considered, and instead, contacts are considered a fraction of all possible contacts amongst a population. This gives rise to the mass-action law which in turn implies a negative quadratic relationship between contacts and individuals. Here we consider how a simple but often used movement model, the correlated random walk, affects the contact rate in a standard Susceptible-Infection (SI) epidemiological model. Via extensive simulation, we show that the contact rate is not always well described by the assumed negative quadratic relationship, $$I(N-I)$$ I ( N - I ) (where $$I$$ I is the number of infected at a given time and $$N$$ N the total number of individuals). Instead, we find that a contact rate proportional to $${\left[I(N-I)\right]}^{\alpha }$$ I ( N - I ) α with $$0<\alpha \le 1$$ 0 < α ≤ 1 is a better qualitative fit, where $$\alpha$$ α depends upon parameters such as the straightness of the movement and the density of individuals. We highlight that the expected contacts at low densities increase with straight line movement, whereas, at high densities, they increase with more random movement.

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A new general index of home range overlap and segregation: the Lesser Kestrel in Southern Italy as a case study

Cited by 8 publications

References 22 publications

Measuring the Degree of Overlap and Segregation among Multiple Probabilistic Home Ranges: A New Index with Illustrative Application to the Lesser Kestrel Falco naumanni

Measuring the Degree of Overlap and Segregation among Multiple Probabilistic Home Ranges: A New Index with Illustrative Application to the Lesser Kestrel Falco naumanni

Application of GPS occurrence data to understand African white‐backed vulturesGyps africanusspatial home range overlaps

An assessment of the contact rates between individuals when movement is modelled by a correlated random walk

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