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Heavy-weighting rare species in dissimilarity indices improve recovery of multivariate groups. ECOLOGICAL COMPLEXITY 2021. [DOI: 10.1016/j.ecocom.2021.100925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Vieira DC, Gallucci F, Corte GN, Checon HH, Zacagnini Amaral AC, Fonseca G. The relative contribution of non-selection and selection processes in marine benthic assemblages. MARINE ENVIRONMENTAL RESEARCH 2021; 163:105223. [PMID: 33302155 DOI: 10.1016/j.marenvres.2020.105223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 11/15/2020] [Accepted: 11/28/2020] [Indexed: 06/12/2023]
Abstract
We tested the hypothesis that the ubiquity of marine meiofaunal nematodes and their indiscriminate passive dispersal create assemblages that are less limited by its environment; whereas the relatively smaller population sizes of macrofauna, associated with their ability to track environmental conditions before settlement, renders their distribution more environmentally-restricted. We compared the empirical distribution of macrofauna and nematode species with that of communities simulated under different assumptions of selection (e.g. environmental filtering) and non-selection (e.g. dispersal limitation) processes. Selection processes were the prime driver of both meio- and macrofauna assemblages, with rare species strongly contributing to this component. The total number of species explained by non-selection processes was 27% higher in nematodes than in macrofauna. Our results underline the importance of a species-level approach to determine the contribution of selection and non-selection assembly processes. Moreover, they highlight the important yet overlooked role of dispersal and stochastic processes in determining species dynamics.
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Affiliation(s)
- Danilo Cândido Vieira
- Centro de Estudos Do Mar - Universidade Federal Do Paraná - Caixa Postal 50.002, 83255-000, Pontal Do Paraná, PR, Brazil; Universidade Federal de São Paulo, Av. Dona Ana Costa, 95 - CEP, 11060-001, Santos, SP, Brazil.
| | - Fabiane Gallucci
- Universidade Federal de São Paulo, Av. Dona Ana Costa, 95 - CEP, 11060-001, Santos, SP, Brazil
| | - Guilherme Nascimento Corte
- Instituto Oceanográfico, Universidade de São Paulo, Praça Do Oceanográfico, 191, São Paulo, SP - CEP, 05508-120, Brazil; Instituto de Biologia, Universidade Estadual de Campinas - Cidade Universitária "Zeferino Vaz", CEP, 13083-970, Campinas, SP, Brazil; Escola Do Mar, Ciência e Tecnologia, Universidade Do Vale Do Itajaí - Rua Uruguai, 458 - CEP 88, 302-202, Itajaí, SC, Brazil
| | - Helio Herminio Checon
- Instituto Oceanográfico, Universidade de São Paulo, Praça Do Oceanográfico, 191, São Paulo, SP - CEP, 05508-120, Brazil; Instituto de Biologia, Universidade Estadual de Campinas - Cidade Universitária "Zeferino Vaz", CEP, 13083-970, Campinas, SP, Brazil
| | - Antônia Cecília Zacagnini Amaral
- Instituto de Biologia, Universidade Estadual de Campinas - Cidade Universitária "Zeferino Vaz", CEP, 13083-970, Campinas, SP, Brazil
| | - Gustavo Fonseca
- Universidade Federal de São Paulo, Av. Dona Ana Costa, 95 - CEP, 11060-001, Santos, SP, Brazil
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Dudgeon D, Ng LCY, Tsang TPN. Shifts in aquatic insect composition in a tropical forest stream after three decades of climatic warming. GLOBAL CHANGE BIOLOGY 2020; 26:6399-6412. [PMID: 32866325 DOI: 10.1111/gcb.15325] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 08/03/2020] [Accepted: 08/16/2020] [Indexed: 06/11/2023]
Abstract
The effects of climatic warming on tropical streams have received little attention, and field studies of such changes are generally lacking. Drifting insects from a Hong Kong forest stream were sampled for 36 months between 2013 and 2016, and compared with samples collected using identical methods in 1983-84. Mean air temperatures rose by ~0.5°C (0.17°C per decade) over this period. The stream drained an uninhabited protected area, so no climate-change effects were confounded by anthropogenic disturbance. In total, 105 taxa and >77,000 individuals were collected. Richness of samples in the historic and contemporary datasets did not differ, but true diversity of drifting insects was highest in 1983-84, and declined between 2013-14 and 2015-16. There was considerable disparity in assemblage composition between 1983-84 and 2013-16, and smaller between-year changes in the contemporary dataset. Nine indicator species of the historic dataset were identified. Most were mayflies, particularly Baetidae, which were greatly reduced in relative abundance in 2013-16. Diptera became more numerous, and tanypodine chironomids were the sole contemporary indicator taxon. Relative abundance of eight of 19 drifting species (comprising 60% of total insects) was lower in 2013-16, when the dominant baetid mayfly during 1983-84 had declined by almost 90%; only one of the 19 species occurred at higher abundance. Eight species were affected by seasonal temperature variability, but these responses were not correlated with any tendency to exhibit long-term changes in abundance. Substantial shifts in composition, including declines in mayfly relative abundance and assemblage diversity, occurred after three decades of warming, despite the broad annual range of stream temperatures (~16°C) in Hong Kong. This contradicts the well-known prediction that organisms from variable climates have evolved wider thermal tolerances that reflect prevailing environmental conditions. The observed compositional reorganization indicates that variability, rather than stability, may be typical of undisturbed tropical stream communities.
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Affiliation(s)
- David Dudgeon
- Division of Ecology and Biodiversity, School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, China
| | - Lily C Y Ng
- Division of Ecology and Biodiversity, School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, China
| | - Toby P N Tsang
- Division of Ecology and Biodiversity, School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, China
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Pisapia C, Stella J, Silbiger NJ, Carpenter R. Epifaunal invertebrate assemblages associated with branching Pocilloporids in Moorea, French Polynesia. PeerJ 2020; 8:e9364. [PMID: 32596053 PMCID: PMC7307568 DOI: 10.7717/peerj.9364] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 05/26/2020] [Indexed: 11/20/2022] Open
Abstract
Reef-building corals can harbour high abundances of diverse invertebrate epifauna. Coral characteristics and environmental conditions are important drivers of community structure of coral-associated invertebrates; however, our current understanding of drivers of epifaunal distributions is still unclear. This study tests the relative importance of the physical environment (current flow speed) and host quality (e.g., colony height, surface area, distance between branches, penetration depth among branches, and background partial mortality) in structuring epifaunal communities living within branching Pocillopora colonies on a back reef in Moorea, French Polynesia. A total of 470 individuals belonging to four phyla, 16 families and 39 genera were extracted from 36 Pocillopora spp. colonies. Decapods were the most abundant epifaunal organisms (accounting for 84% of individuals) found living in Pocillopora spp. While coral host characteristics and flow regime are very important, these parameters were not correlated with epifaunal assemblages at the time of the study. Epifaunal assemblages associated with Pocillopora spp. were consistent and minimally affected by differences in host characteristics and flow regime. The consistency in abundance and taxon richness among colonies (regardless of habitat characteristics) highlighted the importance of total habitat availability. With escalating effects of climate change and other localized disturbances, it is critical to preserve branching corals to support epifaunal communities.
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Affiliation(s)
- Chiara Pisapia
- Department of Ocean Science and Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Kowloon, Hong Kong.,Department of Biology, California State University, Northridge, CA, USA
| | - Jessica Stella
- Great Barrier Reef Marine Park Authority, Townsville, QLD, Australia
| | - Nyssa J Silbiger
- Department of Biology, California State University, Northridge, CA, USA
| | - Robert Carpenter
- Department of Biology, California State University, Northridge, CA, USA
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Hidasi-Neto J, Bini LM, Siqueira T, Cianciaruso MV. Ecological similarity explains species abundance distribution of small mammal communities. ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY 2020. [DOI: 10.1016/j.actao.2019.103502] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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