Ecological trends in moth communities (Geometridae, Lepidoptera) along a complete rainforest elevation gradient in Papua New Guinea

The tropical rainforest elevation gradients, extending from lowlands to treeline, often represent global maxima of biodiversity and are models for community studies. We surveyed geometrid moths along a complete rainforest gradient from 200 to 3700 m asl. in Papua New Guinea. The 16,424 moths collect...

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Veröffentlicht in:Insect conservation and diversity 2023-09, Vol.16 (5), p.649-657
Hauptverfasser: Toko, Pagi S., Koane, Bonny, Molem, Kenneth, Miller, Scott E., Novotny, Vojtech
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container_issue 5
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container_title Insect conservation and diversity
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creator Toko, Pagi S.
Koane, Bonny
Molem, Kenneth
Miller, Scott E.
Novotny, Vojtech
description The tropical rainforest elevation gradients, extending from lowlands to treeline, often represent global maxima of biodiversity and are models for community studies. We surveyed geometrid moths along a complete rainforest gradient from 200 to 3700 m asl. in Papua New Guinea. The 16,424 moths collected with light traps represented 1102 species, a high diversity for such system. We demonstrated the importance of molecular data for taxonomy as COI sequences (DNA barcodes) changed the definition of 19% of morphological species. The abundance of geometrids did not change with elevation while their species richness peaked at 1200 m asl. The mid‐elevation diversity peak is a common, but poorly understood, pattern for geometrids. It was best explained by the species richness of the vegetation. At the same time, the community was exposed to opposing trends in abiotic favourability (decreasing temperature) and biotic favourability (decreasing predation by ants, birds and bats) with elevation, potentially contributing to such unimodal trends in species richness. Beta diversity of communities separated by 500 m elevation increased with increasing elevation, reflecting decreasing mean elevational range of species—a pattern opposite to that expected under the Rapoport's rule. The total number of species along the elevation gradient corresponded to 280% of the highest local community diversity. This enrichment of species underscores the key role of long elevational gradients in maintaining high regional diversity and makes them a conservation priority, especially as they also allow for redistribution of species in response to climate change. We studied 1102 species of geometridae moths along a continuous tropical rainforests gradient in Papua New Guinea, from 200 m lowland to 3700 m asl timberline forest. We recorded a mid‐elevational peak for the geometridae moths, with 1200 m asl as the most species‐rich elevation. The mid‐elevational peak was best explained by vegetation species richness. Beta diversity of communities separated by 500 m elevation increased with elevation, reflecting decreasing mean elevational range of species, a pattern opposite to that expected under Rapoport's rule.
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Beta diversity of communities separated by 500 m elevation increased with increasing elevation, reflecting decreasing mean elevational range of species—a pattern opposite to that expected under the Rapoport's rule. The total number of species along the elevation gradient corresponded to 280% of the highest local community diversity. This enrichment of species underscores the key role of long elevational gradients in maintaining high regional diversity and makes them a conservation priority, especially as they also allow for redistribution of species in response to climate change. We studied 1102 species of geometridae moths along a continuous tropical rainforests gradient in Papua New Guinea, from 200 m lowland to 3700 m asl timberline forest. We recorded a mid‐elevational peak for the geometridae moths, with 1200 m asl as the most species‐rich elevation. The mid‐elevational peak was best explained by vegetation species richness. 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subjects altitudinal gradient
beta diversity
Biodiversity
Climate change
Community
DNA barcoding
geometrids
insect herbivory
Light traps
Melanesia
Nucleotide sequence
Predation
Rainforests
species diversity
Species richness
Treeline
Trends
tropics
title Ecological trends in moth communities (Geometridae, Lepidoptera) along a complete rainforest elevation gradient in Papua New Guinea
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