Hydrological regimes in a tropical valley of New Caledonia (<scp>SW</scp> Pacific): Impacts of wildfires and invasive fauna

Climate change is a crucial factor in increasing wildfire risks, where warmer and drier conditions, increased drought periods and increased lightning strikes have made many areas more susceptible to burning. This special issue focuses on Wildfire and Hydrological Processes, exploring how wildfire has impacted watersheds and water resources. The manuscripts in this collection underscore how wildfire can change the nature of vegetation, characteristics of soils, hydrological flow paths, and residence times of water in the critical zone, and provide new insights toward predictability of wildfire impacts on watersheds. The studies reveal that wildfire can affect water quantity and quality over varying timescales, from during the active burning to years and decades afterward.

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Wildfire and hydrological processes

Boyer

Wagenbrenner

Zhang

2022

Hydrological Processes

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Landscape structure does not hinder the dispersal of an invasive herbivorous mammal in the New Caledonian biodiversity hotspot

Frantz,

Luttringer,

Colyn

et al. 2023

Eur J Wildl Res

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Biological invasions are a major threat to biodiversity and have particularly devastating impacts on island ecosystems. The New Caledonia archipelago is considered a biodiversity hotspot due to its diverse native flora. Javan rusa deer (Rusa timorensis) were introduced to New Caledonia in 1870 and the population consists of several hundred thousand individuals today. They directly threaten rare endemic species and affect the composition and structure of the vegetation. While a rusa deer management plan has identified ten priority areas for deer control operations, removing deer could be offset by the dispersal of animals back into the control areas. Here, we genotyped 628 rusa deer using 16 microsatellite markers to analyse the genetic structure of the animals in New Caledonia. We aimed to assess fine-scale genetic structure, to identify natural barriers to deer movement and to assess functional connectivity by optimising individual-based landscape resistance models. Our results suggested that rusa deer formed a single genetic population on the main New Caledonian island. The isolation-by-distance pattern suggested that female dispersal was limited, whereas males had larger dispersal distances. We assessed functional connectivity using different genetic distance metrics and all models performed poorly (mR2 ≤ 0.0043). Landscape features thus hardly affected deer movement. The characteristics of our results suggested that they were not an artefact of the colonisation history of the species. Achieving an effective reduction of deer population sizes in specific management areas will be difficult because of the deer’s high dispersal capabilities and impossible without very substantial financial investment.

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Assessment of the WRF-Hydro uncoupled hydro-meteorological model on flashy watersheds of the Grande Terre tropical island of New Caledonia (South-West Pacific)

Cerbelaud

Lefêvre

Genthon

et al. 2022

Journal of Hydrology: Regional Studies

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Hydrological regimes in a tropical valley of New Caledonia (SW Pacific): Impacts of wildfires and invasive fauna

Cited by 6 publications

References 50 publications

Wildfire and hydrological processes

Wildfire and hydrological processes

Landscape structure does not hinder the dispersal of an invasive herbivorous mammal in the New Caledonian biodiversity hotspot

Assessment of the WRF-Hydro uncoupled hydro-meteorological model on flashy watersheds of the Grande Terre tropical island of New Caledonia (South-West Pacific)

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