Efficient use of harvest data: An integrated population model for exploited animal populations

Gamelon, Marlène; Baubet, Éric; Besnard, Aurélien; Gaillard, Jean‐Michel; Lebreton, Jean‐Dominique; Touzot, Laura; Veylit, Lara; Giménez, Olivier

doi:10.1101/776104

Cited by 2 publications

(2 citation statements)

References 54 publications

(60 reference statements)

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“…This would reduce uncertainty and improve reliability of parameter estimation including differential vulnerability, natural survival and metapopulation dynamics. This IPM provides an example of a sound framework to assess harvest management, which can be adapted and developed should more flyway‐specific data become available (Gamelon et al, 2019; Saunders et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…IPMs also offer improved precision in estimating demographic rates and population size and can estimate latent (unobserved) variables (Kéry & Schaub, 2012; Schaub & Abadi, 2011). The adaptability of IPMs provides an ideal framework to inform and develop management programmes, as parameters can be updated as new data become available (Gamelon et al, 2019; Johnson et al, 2020; Saunders et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Modelling harvest of Greenland barnacle geese and its implications in mitigating human–wildlife conflict

McIntosh

Bearhop

Hilton

et al. 2023

Journal of Applied Ecology

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1. Arctic-breeding goose populations have increased in recent decades and their expansion into agricultural areas has caused increasing conflict with farmers due to the damage they cause. Lethal control and scaring are common management strategies of conflict mitigation. Management typically focuses on local/national scales, making addressing the impact of localised control on the wider population challenging, particularly when populations move over large areas and cross international borders.2. We construct an integrated population model (IPM) to assess the cumulative impact of all shooting harvest (hunting and derogation shooting) on the Greenland barnacle goose, Branta leucopsis. We use data from monitoring schemes throughout the migratory flyway and use population projections to evaluate the impact of potential future shooting strategies on abundance.3. Our model suggests flyway abundance has declined since its 2012 peak, consistent with an increase in harvest rate and low productivity. Harvest rate increase was most pronounced on Islay (rising from 2% to 7% from 2011 to 2017), suggesting this was a probable cause of flyway abundance decline. 4. Islay abundance has declined since derogation shooting began in 2000, while abundance at other wintering sites has increased. This may indicate that declines in Islay abundance may be due to both shooting mortality and emigration from Islay.5. Should future flyway-level harvest rates increase, further declines in abundance could be expected, and are likely to be more pronounced if harvests are extended to the entire winter range. Conversely, should harvest rates decline, an increase in abundance is predicted. Projections can therefore be used to allocate flywaylevel harvest rates to alleviate local pressure without hindering flyway-level management objectives.6. Synthesis and applications. Our findings demonstrate the impact of local harvests on global abundance, emphasising the importance of internationally coordinated monitoring and management strategies of migratory species. IPMs provide a | 765

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling harvest of Greenland barnacle geese and its implications in mitigating human–wildlife conflict

McIntosh

Bearhop

Hilton

et al. 2023

Journal of Applied Ecology

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Contrasting effects of shooting disturbance on the movement and behavior of sympatric wildfowl species

Ozsanlav‐Harris,

McIntosh,

Griffin

et al. 2024

Ecological Applications

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Human−wildlife conflict is a global conservation issue, necessitating effective mitigation strategies. Hunting is a common management approach to reduce conflict, but the indirect consequences are often overlooked. Chronic hunting‐related disturbance can reduce fitness and redistribute species. In recent decades, goose−agricultural conflict has intensified due to increasing abundance and shifts towards agricultural foraging. On Islay, Scotland, escalating conflict culminated in shooting Greenland barnacle geese Branta leucopsis to reduce damage to agricultural grassland. In this study, we contrast the impact of shooting disturbance on the movement, behavior, energy expenditure and habitat selection of the target species (Greenland barnacle goose) and a vulnerable nontarget species (Greenland white‐fronted goose, Anser albifrons flavirostris) using biologging devices (target species: n = 33; nontarget species: n = 94). Both species were displaced by shooting, and greater distances were subsequently traveled by the target species (1.71 km when directly targeted). When disturbed at any distance, total daily movement increased significantly by 1.18 km for the target species but not for the nontarget species. The target species exhibited no accompanying change in diurnal energy expenditure (measured via accelerometery) but foraged in improved grasslands further from roads after shooting disturbance, where disturbance from all sources was likely lower. The significant increases in movement and changes in foraging site selection of the target species could reduce fitness but given the infrequency of shooting disturbances (0.09 per day) there is likely capacity for compensatory feeding to recoup energetic losses. The nontarget species expectedly showed no significant change in energy expenditure, behavior or habitat selection following shooting disturbance, suggesting mitigation strategies have been effective at minimizing fitness impacts. Refuge areas with a 3.5 km diameter (three times the maximum distance from shooting that displacement was detectable) could provide undisturbed foraging for the target species, minimizing compensatory feeding and further agricultural damage. Wildlife managers should, where possible, consider the fitness implications of shooting disturbance, and whether compensatory feeding and redistribution could hamper conflict mitigation. Management strategies should also include species‐specific monitoring and mitigation as we have demonstrated differing responses potentially due to imposed mitigation but also differing species ecology and “landscapes of fear.”

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Efficient use of harvest data: An integrated population model for exploited animal populations

Cited by 2 publications

References 54 publications

Modelling harvest of Greenland barnacle geese and its implications in mitigating human–wildlife conflict

Modelling harvest of Greenland barnacle geese and its implications in mitigating human–wildlife conflict

Contrasting effects of shooting disturbance on the movement and behavior of sympatric wildfowl species

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