TY - JOUR

T1 - Genomic differentiation in an endemic Philippine genus (Aves

T2 - Sarcophanops) owing to geographical isolation on recently disassociated islands

AU - Campillo, Luke C.

AU - Manthey, Joseph D.

AU - Thomson, Robert C.

AU - Hosner, Peter A.

AU - Moyle, Robert G.

PY - 2020

Y1 - 2020

N2 - Phylogeographical studies of Philippine vertebrates have demonstrated that genetic variation is broadly partitioned by Pleistocene island aggregation. Contemporary island discontinuity is expected to influence genetic differentiation but remains relatively undocumented, perhaps because the current episode of island isolation started in relatively recent times. We investigated inter- and intra-island population structure in a Philippine endemic bird genus (Sarcophanops) to determine whether genetic differentiation has evolved during the recent period of isolation. We sequenced thousands of genome-wide restriction site associated DNA (RAD) markers from throughout the Mindanao group to assess fine-scale genetic structure across islands. Specifically, we investigated patterns of gene flow and connectivity within and between taxonomic and geographical bounds. A previous assessment of mitochondrial DNA detected deep structure between Sarcophanops samarensis and a sister species, Sarcophanops steerii, but was insufficient to detect differentiation within either species. Analysis of RAD markers, however, revealed structure within S. samarensis between the islands of Samar/Leyte and Bohol. This genetic differentiation probably demonstrates an effect of recent geographical isolation (after the Last Glacial Maximum) on the genetic structure of Philippine avifauna. We suggest that the general lack of evidence for differentiation between recently isolated populations is a failure to detect subtle population structure owing to past genetic sampling constraints, rather than the absence of such structure.

AB - Phylogeographical studies of Philippine vertebrates have demonstrated that genetic variation is broadly partitioned by Pleistocene island aggregation. Contemporary island discontinuity is expected to influence genetic differentiation but remains relatively undocumented, perhaps because the current episode of island isolation started in relatively recent times. We investigated inter- and intra-island population structure in a Philippine endemic bird genus (Sarcophanops) to determine whether genetic differentiation has evolved during the recent period of isolation. We sequenced thousands of genome-wide restriction site associated DNA (RAD) markers from throughout the Mindanao group to assess fine-scale genetic structure across islands. Specifically, we investigated patterns of gene flow and connectivity within and between taxonomic and geographical bounds. A previous assessment of mitochondrial DNA detected deep structure between Sarcophanops samarensis and a sister species, Sarcophanops steerii, but was insufficient to detect differentiation within either species. Analysis of RAD markers, however, revealed structure within S. samarensis between the islands of Samar/Leyte and Bohol. This genetic differentiation probably demonstrates an effect of recent geographical isolation (after the Last Glacial Maximum) on the genetic structure of Philippine avifauna. We suggest that the general lack of evidence for differentiation between recently isolated populations is a failure to detect subtle population structure owing to past genetic sampling constraints, rather than the absence of such structure.

KW - allopatric

KW - Last Glacial Maximum

KW - Pleistocene

KW - RADseq

KW - wattled broadbill

KW - DIVERSIFICATION

KW - DIVERSITY

KW - INFERENCE

KW - TOOL

U2 - 10.1093/biolinnean/blaa143

DO - 10.1093/biolinnean/blaa143

M3 - Journal article

C2 - 34690487

VL - 131

SP - 814

EP - 821

JO - Proceedings of the Linnean Society of London

JF - Proceedings of the Linnean Society of London

SN - 0024-4066

IS - 4

ER -