The role of evolutionary time, diversification rates and dispersal in determining the global diversity of a large radiation of passerine birds
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The role of evolutionary time, diversification rates and dispersal in determining the global diversity of a large radiation of passerine birds. / Cai, Tianlong; Shao, Shimiao; Kennedy, Jonathan D.; Alstrom, Per; Moyle, Robert G.; Qu, Yanhua; Lei, Fumin; Fjeldså, Jon.
In: Journal of Biogeography, Vol. 47, No. 7, 2020, p. 1612-1625.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The role of evolutionary time, diversification rates and dispersal in determining the global diversity of a large radiation of passerine birds
AU - Cai, Tianlong
AU - Shao, Shimiao
AU - Kennedy, Jonathan D.
AU - Alstrom, Per
AU - Moyle, Robert G.
AU - Qu, Yanhua
AU - Lei, Fumin
AU - Fjeldså, Jon
PY - 2020
Y1 - 2020
N2 - Aim: Variation in species diversity among different geographical areas may result from differences in speciation and extinction rates, immigration and time for diversification. An area with high species diversity may be the result of a high net diversification rate, multiple immigration events from adjacent regions, and a long time available for the accumulation of species (known as the 'time-for-speciation effect'). Here, we examine the relative importance of the three aforementioned processes in shaping the geographical diversity patterns of a large radiation of passerine birds.Location: Global.Taxon: Babblers (Aves: Passeriformes).Methods: Using a comprehensive phylogeny of extant species (similar to 90% sampled) and distributions of the world's babblers, we reconstructed their biogeographical history and analysed the diversification dynamics. We examined how species richness correlates with the timing of regional colonization, the number of immigration events and the rate of speciation within all 13 geographical distribution regions.Results: We found that babblers likely originated in the Sino-Himalayan Mountains (SHM) in the early Miocene, suggesting a long time for diversification and species accumulation within the SHM. Regression analyses showed the regional diversity of babblers can be well explained by the timing of the first colonization within of these areas, while differences in rates of speciation or immigration have far weaker effects. Nonetheless, the rapid speciation of Zosterops during the Pleistocene has accounted for the increased diversification and accumulation of species in the oceanic islands.Main Conclusions: Our results suggest that the global diversity patterns of babblers have predominantly been shaped by the time-for-speciation effect. Our findings also support an origin centred in tropical and subtropical parts of the SHM, with a cradle of recent diversification in the oceanic islands of the Indo-Pacific and Indian Ocean regions, which provides new insights into the generation of global biodiversity hotspots.
AB - Aim: Variation in species diversity among different geographical areas may result from differences in speciation and extinction rates, immigration and time for diversification. An area with high species diversity may be the result of a high net diversification rate, multiple immigration events from adjacent regions, and a long time available for the accumulation of species (known as the 'time-for-speciation effect'). Here, we examine the relative importance of the three aforementioned processes in shaping the geographical diversity patterns of a large radiation of passerine birds.Location: Global.Taxon: Babblers (Aves: Passeriformes).Methods: Using a comprehensive phylogeny of extant species (similar to 90% sampled) and distributions of the world's babblers, we reconstructed their biogeographical history and analysed the diversification dynamics. We examined how species richness correlates with the timing of regional colonization, the number of immigration events and the rate of speciation within all 13 geographical distribution regions.Results: We found that babblers likely originated in the Sino-Himalayan Mountains (SHM) in the early Miocene, suggesting a long time for diversification and species accumulation within the SHM. Regression analyses showed the regional diversity of babblers can be well explained by the timing of the first colonization within of these areas, while differences in rates of speciation or immigration have far weaker effects. Nonetheless, the rapid speciation of Zosterops during the Pleistocene has accounted for the increased diversification and accumulation of species in the oceanic islands.Main Conclusions: Our results suggest that the global diversity patterns of babblers have predominantly been shaped by the time-for-speciation effect. Our findings also support an origin centred in tropical and subtropical parts of the SHM, with a cradle of recent diversification in the oceanic islands of the Indo-Pacific and Indian Ocean regions, which provides new insights into the generation of global biodiversity hotspots.
KW - biogeography
KW - dispersal
KW - diversification rate
KW - explosive radiation
KW - oceanic islands
KW - Sino-Himalayan Mountains
KW - time-for-speciation effect
KW - FOUNDER-EVENT SPECIATION
KW - HISTORICAL BIOGEOGRAPHY
KW - SPECIES RICHNESS
KW - LATE MIOCENE
KW - HIMALAYAN
KW - PATTERNS
KW - PHYLOGENY
KW - MOUNTAINS
KW - SELECTION
KW - BABBLERS
U2 - 10.1111/jbi.13823
DO - 10.1111/jbi.13823
M3 - Journal article
VL - 47
SP - 1612
EP - 1625
JO - Journal of Biogeography
JF - Journal of Biogeography
SN - 0305-0270
IS - 7
ER -
ID: 245894974