TY - JOUR

T1 - A global analysis of avian island diversity–area relationships in the Anthropocene

AU - Matthews, Thomas J.

AU - Wayman, Joseph P.

AU - Whittaker, Robert J.

AU - Cardoso, Pedro

AU - Hume, Julian P.

AU - Sayol, Ferran

AU - Proios, Konstantinos

AU - Martin, Tom

AU - Baiser, Benjamin

AU - Borges, Paulo A. V.

AU - Kubota, Yasuhiro

AU - dos Anjos, Luiz

AU - Tobias, Joseph A.

AU - Soares, Filipa C.

AU - Si, Xingfeng

AU - Ding, Ping

AU - Mendenhall, Chase D.

AU - Sin, Yong Chee Keita

AU - Rheindt, Frank E.

AU - Triantis, Kostas A.

AU - Guilhaumon, Francois

AU - Watson, David M.

AU - Brotons, Lluis

AU - Battisti, Corrado

AU - Chu, Osanna

AU - Rigal, Francois

N1 - 12 month embargo at publication

PY - 2023/6

Y1 - 2023/6

N2 - Research on island species–area relationships (ISAR) has expanded to incorporate functional (IFDAR) and phylogenetic (IPDAR) diversity. However, relative to the ISAR, we know little about IFDARs and IPDARs, and lack synthetic global analyses of variation in form of these three categories of island diversity–area relationship (IDAR). Here, we undertake the first comparative evaluation of IDARs at the global scale using 51 avian archipelagic data sets representing true and habitat islands. Using null models, we explore how richness-corrected functional and phylogenetic diversity scale with island area. We also provide the largest global assessment of the impacts of species introductions and extinctions on the IDAR. Results show that increasing richness with area is the primary driver of the (non-richness corrected) IPDAR and IFDAR for many data sets. However, for several archipelagos, richness-corrected functional and phylogenetic diversity changes linearly with island area, suggesting that the dominant community assembly processes shift along the island area gradient. We also find that archipelagos with the steepest ISARs exhibit the biggest differences in slope between IDARs, indicating increased functional and phylogenetic redundancy on larger islands in these archipelagos. In several cases introduced species seem to have ‘re-calibrated’ the IDARs such that they resemble the historic period prior to recent extinctions.

AB - Research on island species–area relationships (ISAR) has expanded to incorporate functional (IFDAR) and phylogenetic (IPDAR) diversity. However, relative to the ISAR, we know little about IFDARs and IPDARs, and lack synthetic global analyses of variation in form of these three categories of island diversity–area relationship (IDAR). Here, we undertake the first comparative evaluation of IDARs at the global scale using 51 avian archipelagic data sets representing true and habitat islands. Using null models, we explore how richness-corrected functional and phylogenetic diversity scale with island area. We also provide the largest global assessment of the impacts of species introductions and extinctions on the IDAR. Results show that increasing richness with area is the primary driver of the (non-richness corrected) IPDAR and IFDAR for many data sets. However, for several archipelagos, richness-corrected functional and phylogenetic diversity changes linearly with island area, suggesting that the dominant community assembly processes shift along the island area gradient. We also find that archipelagos with the steepest ISARs exhibit the biggest differences in slope between IDARs, indicating increased functional and phylogenetic redundancy on larger islands in these archipelagos. In several cases introduced species seem to have ‘re-calibrated’ the IDARs such that they resemble the historic period prior to recent extinctions.

KW - birds

KW - community assembly

KW - diversity-area relationship

KW - functional diversity

KW - habitat fragments

KW - islands

KW - phylogenetic diversity

KW - species-area relationship

U2 - 10.1111/ele.14203

DO - 10.1111/ele.14203

M3 - Article

VL - 26

SP - 965

EP - 982

JO - Ecology Letters

JF - Ecology Letters

SN - 1461-0248

IS - 6

ER -