DOI: 10.17026/dans-x35-fxfj
title: Data from: Modelling impacts of habitat loss and fragmentation on mammal species

description: In my thesis ‘Modelling impacts of habitat loss and fragmentation on mammal species’, my aim was to quantify species-specific impacts on land-use change across a large number of mammal species. To achieve this aim, I wanted to (1) obtain and validate species-specific data relevant for quantifying these impacts across a large number of mammal species and (2) quantify ecologically meaningful indicators of habitat loss and fragmentation. Chapters 2-4 of my thesis focus on the first subgoal, chapters 5-6 focus on the second subgoal. In this repository, data accompanying chapters 4 and 5 were published.In chapter 4: ‘Global environmental drivers of home range size in terrestrial and marine mammal species’, the relationship between home range size (HRS) and environmental variables was quantified, accounting for species traits and their interactions with environmental variables for terrestrial and marine mammals. A novel, comprehensive dataset of 2,800 HRS estimates from 586 terrestrial and 27 marine mammal was used. The results indicated that HRS of terrestrial mammals was strongly related to both species traits (body mass, diet, and locomotion type) and environmental conditions (human disturbance, productivity, seasonality). HRS of marine mammals was only related to environmental conditions (mean sea surface temperature and standard deviation of sea surface temperature). In this repository the following data were published that were used to perform the analyses:• Home_range_data: Excelsheet with the subset of home range sizes from the HomeRange database (Broekman et al., 2023) included in the analysis with associated data on the values of species traits and environmental variables.• Data_sources: List of references for the home range data included in this study.• Chapter4_AppendixS2: Results of model selection for terrestrial and marine mammals.In chapter 5: ‘Impacts of existing and planned roads on terrestrial mammal habitat in New Guinea’, the Equivalent Connected Area (ECA) was estimated of habitat for 139 terrestrial mammal species with &gt;90% of their habitat area in New Guinea. The ECA was calculated in three different situations: (1) no roads (baseline situation), (2) existing roads (current situation), and (3) existing and planned roads (future situation). Habitat fragmentation effects of roads were then quantified for each species by comparing the ECA in situations 2 and 3 to the ECA in situation 1. On average across the species, the ECA in the current situation equals 89% (SD = 12%) of the baseline ECA values (i.e., a situation without roads) and the lowest remaining ECA was found for Shawmayer’s coccymys (Coccymys shawmayeri, 53%). The average remaining ECA decreases to 71% (SD = 20%) of the baseline ECA values in the future situation. Further, the future remaining ECA drops to below 50% of the baseline for 28 species and the lowest remaining ECA was found for the montane soft-furred paramelomys (Paramelomys mollis, 36%). In this repository the following data were published that were used to perform the analyses:• Roads_new_Guinea: shapefile with the existing and planned roads in New Guinea. These road data were either obtained from the Global Roads Inventory Project (GRIP) database (Meijer et al., 2018) or digitized from the maps published by Alamgir et al. (2019) and Sloan et al. (2019). Attribute data for each road includes an unique road identity number, road type, road surface, road width, and whether the road is an existing road or planned road.• Refined_range_[species_name]: species-specific raster files (.tif) in WGS84 projection at ~100m resolution indicating whether a grid cell is part of the refined species range (= 1).• Trait_data_and_results: Excelsheet with species-specific trait data, road crossing probabilities, and ECA values.• Chapter5_AppendixS1: see Trait_data_and_resultsReferencesAlamgir M., Sloan S., Campbell M.J., Engert J., Kiele R., Porolak G., Mutton T., Brenier A., Ibisch P.L., Laurance W.F. (2019) Infrastructure expansion challenges sustainable development in Papua New Guinea. Plos One, 14, 20.Broekman M.J.E., Hoeks S., Freriks R., Langendoen M.M., Runge K.M., Savenco E., ter Harmsel R., Huijbregts M.A., TuckerM.A. (2023) HomeRange: A global database of mammalian home ranges. Global Ecology and Biogeography, 32, 198-205.Meijer J.R., Huijbregts M.A.J., Schotten K., Schipper A.M. (2018) Global patterns of current and future road infrastructure. Environmental Research Letters, 13, 10.Sloan S., Campbell M.J., Alamgir M., Engert J., Ishida F.Y., Senn N., Huther J., Laurance W.F. (2019) Hidden challenges for conservation and development along the Trans-Papuan economic corridor. Environmental Science & Policy, 92, 98-106.