Bibliographic Details
| Title: |
Diversification and evolution of Hawaiian Megalagrion damselflies (Pinapinao, Odonata: Coenagrionidae). |
| Authors: |
Hadfield, Robert K.1,2 (AUTHOR) robert7hadfield@gmail.com, Jordan, Steve3 (AUTHOR), Polhemus, Dan A.4 (AUTHOR), Sutherland, Laura N.1 (AUTHOR), Peck, Steven L.1 (AUTHOR), Abbott, John C.5,6 (AUTHOR), Frandsen, Paul B.7 (AUTHOR), Guralnik, Robert P.8 (AUTHOR), Kalkman, Vincent J.9 (AUTHOR), Ware, Jessica L.10 (AUTHOR), Bybee, Seth M.1,2 (AUTHOR) |
| Source: |
Systematic Entomology. Jan2026, Vol. 51 Issue 1, p1-24. 24p. |
| Subjects: |
Damselflies, Adaptive radiation, Genetic speciation, Macroevolution, Biological evolution, Biogeography, Phylogeny |
| Geographic Terms: |
Kauai (Hawaii) |
| Abstract (English): |
Hawaiʻi's pinapinao (Megalagrion McLachlan) comprises a radiation of 23 endemic damselfly species within Coenagrionidae. Despite being a unique study system for understanding geology's impacts on evolutionary processes among Odonata, the understanding of these damselflies' temporal, geographic and phylogenetic origins remains incomplete. Testing macroevolutionary hypotheses has been hampered by conflicting topologies. To resolve these uncertainties, we performed phylogenetic analyses including divergence time estimation with 90 nuclear loci (>50 kbp) and 2 mitochondrial loci (>1 kbp), sampling representatives from 37 genera within core Coenagrionidae and 90% of Megalagrion species, including multiple island populations. We used ancestral range estimations, diversification analyses, agent‐based simulation modelling and ancestral state reconstruction to infer the group's origin and biogeography and assess traits' roles in diversification. Our findings indicate Megalagrion's ancestor diverged from core Coenagrionidae in the early Eocene (~51 MA) and diversified in the early Miocene (~19 MA), suggesting Megalagrion's MRCA predates Kauaʻi's emergence by 7–21 MY. Diversification analyses suggest a low rate after Megalagrion diverged from Coenagrionidae followed by a sudden increase around 19 MA, and simulation modelling supports extinction playing a significant role. Extant Megalagrion diversity is largely explained by ecological diversification into at least five clades with distinct breeding habitats that likely evolved on Northwestern Hawaiian Islands that are now‐sunken seamounts. Speciation continued as descendants dispersed to current Hawaiian Islands as islands emerged. Species breeding in seeps further diversified within the island of Kauaʻi. Our results highlight including geologic changes over time in evolutionary studies and increase understanding of diversification patterns, biogeography and adaptive radiation on islands. [ABSTRACT FROM AUTHOR] |
| Abstract (Swahili): |
ʻĀpana: He lehu hoʻonui ʻano o 23 ʻano kūloko kēia mau pinapinao i loko o ka ʻohana Coenagrionidae. ʻOiai he ʻōnaehana noiʻi kūikawā lākou no ka hoʻomaopopo pehea e kālailai ai ke kahua ʻāina i nā kaʻina hoʻoili lāhui o nā kukulānī lele, ʻaʻole i pau ka ʻike no ko lākou kumu‐manawa, kūlana ʻāina, a me ke kālai kumunānā. Ua paʻakikī ke hōʻoia i nā manaʻo ulu lāhui ākea no ka paio o nā hakuʻina lālā kuʻikahi ʻole. I mea e hoʻoponopono ai i kēia mau kānalua, ua hoʻopaʻa mākou i nā kālailai kūpuna‐lālā, me ka ana ʻana i ka manawa hoʻokaʻawale ma o 90 kiko moleola kūloko a me 2 kiko moleola mitokanelia, e uhi ana i nā hāpana mai 37 ʻano o ka ʻāpana kumu Coenagrionidae a me 90 kenekulia o nā ʻano Megalagrion, me nā laʻana mai nā mokupuni like ʻole. Ua hoʻohui pū ʻia ka wānana ʻāina kūpuna, nā kālailai hoʻonui lālā, ka hoʻohālike kamepiula ʻelele, a me ka hana hou ʻana i ke kūlana kūpuna no ka ʻimi ʻana i ka hoʻomaka a me ka kuʻaleka nohoʻāinaola o ka pūʻulu, a e nānā i ke kuleana o nā hiʻohiʻona i ka hoʻonui ʻana. Hōʻike nā hualoaʻa i ka hoʻokaʻawale ʻia o ke kūpuna o Megalagrion mai ke koena o Coenagrionidae i ka wā Eokene mua (ʻaneʻane 51 miliona makahiki i hala aku nei) a ua hoʻomaka ka hoʻonui lālā i ka wā Miokene mua (ʻaneʻane 19 miliona makahiki i hala aku nei); no laila, ua hoʻomua ka kupuna like kokoke loa o Megalagrion i ke kūkulu ʻia ʻana o Kauaʻi ma waena o 7 a 21 miliona makahiki ma mua. Ma hope o ka hoʻokaʻawale mua, ua haʻahaʻa ka wikiwiki hoʻonui, akā ua ʻike ʻia he piʻi koke ma ka pae 19 miliona makahiki, a kākoʻo ka hoʻohālike kamepiula i ka nui o ka hana a ke luku loa i ke ʻano o kēia lā. Loaʻa ka lehulehu o Megalagrion i kēia wā ma ka hoʻolaha ʻokoʻa kaiāulu i lālā ʻelima a ʻoi aku, kēlā me kēia me nā wahi hānai kū hoʻokahi i manaʻo ʻia i kupu mua ma nā Mokupuni Hawaiʻi ʻĀkau Komohana, i kēia manawa he mauna kai huna i lalo o ke kai. Ua hoʻomau ka hoʻonui lālā i ka wā i neʻe aku ai nā kūpuna i nā Mokupuni Hawaiʻi hou e pāholo aʻe ana, a ua nui hou ka ʻaʻano o nā ʻano hānai i nā puna wai māhu o Kauaʻi. Hoʻakūpono kēia noiʻi i ka waiwai o ka hoʻohui ʻana i nā loli ʻāina ma ka lōʻihi o ka manawa i nā kālailai ulu lāhui, a hoʻonui i ko kākou ʻike no ka hoʻonui lālā, kuʻaleka nohoʻāinaola, a me ka lehu hoʻonui ʻano ma nā mokupuni. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
