Distribution of long-horn beetles (Cerambycidae: Coleoptera) within the Fijian archipelago

Waqa-Sakiti, Hilda V. F.; Hodge, Simon; Winder, Linton

doi:10.1071/sp18001

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…(2013); Schrader et al. (2019); Surendran and Vasudevan (2015); Theuerkauf et al (2017); Usher and Edwards (1986); Waqa‐Sakiti et al (2018); Werden (2012); Xu et al. (2017); Žagar et al (2013); and Zalewski and Ulrich (2006).…”

Section: Methodsmentioning

confidence: 99%

Synthesis reveals that island species–area relationships emerge from processes beyond passive sampling

Gooriah

Blowes

Sagouis

et al. 2021

Global Ecol Biogeogr

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Aim The island species–area relationship (ISAR) quantifies how the number of species increases as the area of an island or island‐like habitat gets larger and is one of the most general patterns in ecology. However, studies that measure the ISAR often confound variation in sampling methodology and analyses, precluding appropriate syntheses of its underlying mechanisms. Most ISAR studies use only presence–absence data at the whole‐island scale, whereas we planned to use a framework that applies individual‐based rarefaction to synthesize whether and how the ISAR differs from the null expectation of the passive sampling hypothesis. Location Five hundred and five islands from 34 different archipelagos across the world, including oceanic islands, lake islands and forest islands. Major taxa studied Local assemblages of plants, invertebrates, herpetofauna, birds and mammals. Methods We collated local‐scale species abundance data from multiple archipelagos (median of 12 islands per study) and used a rarefaction‐based approach to synthesize the relationship between island size and (1) sample effort‐controlled rarefied species richness, or (2) an effective number of species derived from the probability of interspecific encounter (an index of community evenness). Results When we applied rarefaction to control for sampling effort, the numbers of species and their relative abundances across all studies differed from the passive sampling hypothesis. Our measure of evenness also increased with island size, suggesting that the disproportionate effects we observed influenced both rarer and more common species. We found few associations between the slope of this effect and island type or taxon, but we did find that island archipelagos with greater elevational heterogeneity also deviated more from the null expectation than those with less heterogeneity. Main conclusions Using a synthetic approach across island archipelagos, we reject the null expectation that passive sampling causes the ISAR and instead suggest that ecological mechanisms leading to disproportionate (non‐random) effects on larger relative to smaller islands are predominant.

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Section: Methodsmentioning

confidence: 99%

Synthesis reveals that island species–area relationships emerge from processes beyond passive sampling

Gooriah

Blowes

Sagouis

et al. 2021

Global Ecol Biogeogr

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Widespread Wolbachia infection is correlated with increased mtDNA diversity in native bees across the Fijian archipelago

Freedman,

Davies,

Stevens

et al. 2024

Symbiosis

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Insects have a complex coevolutionary history with bacterial symbionts, among which Wolbachia pipientis stands out for its prevalence and role in reproductive manipulation. Wolbachia can induce cytoplasmic incompatibility, feminisation, male killing, and parthenogenesis, greatly influence the population genetics of their hosts and are potential drivers of invertebrate speciation. We might then assume that Wolbachia could act synergistically with other factors, such as niche conservation and isolation by distance, to drive speciation in hyper-diverse invertebrate taxa. The Fijian archipelago hosts a remarkable and recently diverged clade of Lasioglossum (Homalictus) bees. Some of these Lasioglossum have highly unusual species-level sex ratios and mitochondrial diversities, which can be hallmarks of infection by a bacterial reproductive manipulator. To examine the role of Wolbachia in Fijian Lasioglossum speciation, we screened the endemic Fijian bees for Wolbachia using the Wolbachia surface protein gene (wsp). We compare the distribution of Wolbachia infection across species with host mitochondrial haplotype diversity and conducted phylogenetic analyses to determine the relationship of host relatedness and symbiont infection status. We found that Wolbachia haplotypes probably span across supergroups A and B. In addition, we found multiple haplotypes were highly similar, with the most abundant group of wsp haplotypes being closely related with the drosophila Wolbachia strain wHa. We found evidence of mostly horizontal and limited vertical transmission, and little evidence for Wolbachia-host cospeciation. We show that, contrary to general patterns, Wolbachia-infected Lasioglossum species have higher mitochondrial diversity. Finally, we present evidence for the potential of multiple modes of host manipulation in this clade.

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Avian diversity and abundance across years: consistent patterns in forests but not grasslands on Viti Levu, Fiji

Naikatini

Keppel

Brodie

et al. 2022

Pacific Conserv. Biol.

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Context. Habitat loss is a global problem and in Fiji >50% of the land area once covered by forests has been converted to grasslands and agricultural land. About 99% of Fiji's endemic biodiversity and 80% of the land bird species have been identified as forest species. Aims. In this study, we compare forest and grassland sites and test for consistency in avian diversity, abundance, foraging guild, and distribution status (endemic, native, introduced to Fiji) over a 5-year period (2016-2020). Methods. We surveyed bird communities using the point count method with a 100 m radius and 7-min observation period per site. Key results. A one-way analysis of similarities (ANOSIM) analysis showed significant differences in species composition and bird abundance between the forested habitats and grassland habitats. A general linear model test showed significant differences in foraging guild composition and distribution status between forested and grassland habitats. There were no significant differences between the three forested sites (primary montane forest, secondary old-growth forest, old-growth mahogany plantations with regenerating native species), while grassland sites had stronger annual change in species composition. Implications. Forest cover, irrespective of whether these forests are of primary or secondary nature, therefore plays an important role in maintaining the native and endemic land bird species and other biodiversity in oceanic island ecosystems such as Viti Levu Island, Fiji.

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Distribution of long-horn beetles (Cerambycidae: Coleoptera) within the Fijian archipelago

Cited by 3 publications

References 13 publications

Synthesis reveals that island species–area relationships emerge from processes beyond passive sampling

Synthesis reveals that island species–area relationships emerge from processes beyond passive sampling

Widespread Wolbachia infection is correlated with increased mtDNA diversity in native bees across the Fijian archipelago

Avian diversity and abundance across years: consistent patterns in forests but not grasslands on Viti Levu, Fiji

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