Comparison of adult census size and effective population size support the need for continued protection of two Solomon Island endemics
Data files
Jun 29, 2021 version files 6.41 MB
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Cowles_et_al._2021_Emu_DATASETS_ReadMe.txt
6.63 KB
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Cowles_etal_Zosterops_Dryad.xlsx
12.70 KB
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filt_miss75_final.recode.vcf
6.38 MB
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Z_kulambangrae_5-26-20.csv
2.63 KB
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Z_murphyi_5-26-20.csv
1.85 KB
Abstract
Because a population’s ability to respond to rapid change is dictated by standing genetic variation, we can better predict a population’s long-term viability by estimating and then comparing adult census size (N) and effective population size (Ne). However, most studies only measure N or Ne, which can be misleading. Using a combination of field and genomic sequence data, we here estimate and compare N and Ne in two range-restricted endemics of the Solomon Islands. Two Zosterops White-eye species inhabit the small island of Kolombangara, with a high elevation species endemic to the island (Z. murphyi) and a low elevation species endemic to the Solomon Islands (Z. kulambangrae). Field observations reveal large values of N for both species with Z. kulambangrae numbering at 114,781 ± 32,233 adults, and Z. murphyi numbering at 64,412 ± 15,324 adults. In contrast, genomic analyses reveal that Ne was much lower than N, with Z. kulambangrae estimated at 694.5 and Z. murphyi at 796.1 individuals. Further, positive Tajima’s D values for both species suggest that they have experienced a demographic contraction, providing a mechanism for low values of Ne. Comparison of N and Ne suggests that Z. kulambangrae and Z. murphyi are not at immediate threat of extinction but may be at genetic risk. Our results provide important baseline data for long-term monitoring of these island endemics, and argue for measuring both population size estimates to better gauge long-term population viability.
Five files are uploaded:
1) Field data (Bird ID, transect, sex, GPS point of capture): Cowles_etal_Zosterops_Dryad
2) Point count data for Z. kulambangrae: Z_kulambangrae_5-26-20.csv
3) Point count data for Z. murphyi: Z_murphyi_5-26-20.csv
4) Processed genomics file containing 1508 SNPs used to measure Ne: filt_miss75_final_recode
5) ReadMe file containing author information, data collection information, and descriptions of the datasets