A Practical Strategy for Analysing Multispecies Distribution Patterns

Field, J. G.; Clarke, K.R.; Warwick, R.M.

doi:10.3354/meps008037

Cited by 1,522 publications

(906 citation statements)

References 24 publications

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“…Similarities between samples were examined using the Bray-Curtis method (Bray and Curtis, 1957). To group the samples, similarity indices were coupled with hierarchical agglomerative clustering using a complete linkage method -the unweighted pair group method -using the arithmetic mean, UPGMA (Field et al, 1982). All analyses were performed using PRIMER v6 (PRIMER-E Ltd.).…”

Section: Microplankton Analysismentioning

confidence: 99%

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Short-term changes in a microplankton community in the Chukchi Sea during autumn: consequences of a strong wind event

et al. 2016

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Abstract.Recent studies indicate an increase in atmospheric turbulence in the Chukchi Sea due to the recent drastic sea-ice reduction during summer months. The importance of the effects of this atmospheric turbulence on the marine ecosystem in this region, however, is not fully understood. To evaluate the effects of atmospheric turbulence on the marine ecosystem, high-frequency sampling (daily) from five layers of the microplankton community between 0 and 30 m at a fixed station in the Chukchi Sea from 10 through 25 September 2013 was conducted. During the study period, a strong wind event (SWE) was observed on 18 and 19 September. The abundance of microplankton was 2.6 to 17.6 cells mL −1 , with a maximum abundance being reported at 20 m on 22 September, while diatoms were the most dominant taxa throughout the study period. The abundance of diatoms, dinoflagellates and ciliates ranged between 1.6 and 14.1, 0.5 and 2.4 and 0.1 and 2.8 cells mL −1 , respectively. Diatoms belonging to 7 genera consisting of 35 species (Cylindrotheca closterium and Leptocylindrus danicus were dominant), dinoflagellates belonging to 7 genera consisting of 25 species (Prorocentrum balticum and Gymnodinium spp. were dominant) and ciliates belonging to 7 genera consisting of 8 species (Strobilidium spp. and Strombidium spp. were dominant) were identified. Within the microplankton species, there were 11 species with abundances that increased after the SWE, while there was no species with an abundance that decreased following the SWE. It is conjectured that atmospheric turbulences, such as that of an SWE, may supply sufficient nutrients to the surface layer that subsequently enhance the small bloom under the weak stratification of the Chukchi Sea Shelf during the autumn months. After the bloom, the dominant diatom community then shifts from centric-dominated to one where centric/pennate are more equal in abundance.

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Section: Microplankton Analysismentioning

confidence: 99%

“…Because we did not check pigments in the cell, the nutrition of dinoflagellates (heterotrophs, autotrophs and mixotrophs) was not distinguishable in this study. (Field et al, 1982). Similarities between samples were examined using the Bray-Curtis method (Bray and Curtis, 1957).…”

Section: Microplankton Analysismentioning

confidence: 99%

Short-term changes in a microplankton community in the Chukchi Sea during autumn: consequences of a strong wind event

et al. 2016

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“…Two factors were considered: sampling date and treatment. Only taxa with abundance > 4% were considered, we used this criteria of matrix reduction because rare species do not present analyzable patterns (Field et al 1982, Szalay & Resh 1997. The macroinvertebrate densities were log transformed log (x + 1) to reduce data variations.…”

Section: Discussionmentioning

confidence: 99%

Effect of Typha domingensis cutting: response of benthic macroinvertebrates and macrophyte regeneration

et al. 2012

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Abstract:Wetlands are important because they have high biodiversity and are considered, by environmental agencies, permanently protected areas due to their importance to conservation. In Southern Brazil the aquatic macrophyte Typha domingensis is harvested to be used in the manufacture of handicraft, being an important income source to small farmers. This work aims to test the cut effect of T. domingensis on benthic macroinvertebrates as well as on macrophyte regeneration. These phenomena were analyzed in small areas (1 m²) in a T. domingensis stand by comparing cut treatments and control treatments. Macroinvertebrate were sampled with a corer in the following time sequence after the cut event in both treatments: one day, 26 days, 60 days, 89 days, and 182 days. Macrophyte regeneration was monitored through monthly measurements at each treatment. The macroinvertebrate density did not differ between treatments (ANOVA, p < 0.05). Among the 23 taxa identified, Tubificidae was the only family to response to cut treatment. DCA showed an overlapping between treatments indicating a not clear pattern. The growth of T. domingensis shoots was not affected by the disturbance. Macrophyte regeneration was quick when comparing the treatments and statistical differences were found in one day after the disturbance and 26 days after the disturbance, whereas no differences were found in the remaining sampling dates (60, 89 and 182 days). Observing the macroinvertebrate response and the T. domingensis regeneration, our results suggest that sustainable use of this macrophyte is possible on a small scale. Keywords: disturbance, bioindication, vegetal management, aquatic macrophytes, non-wood products. SILVEIRA, T.C.L., RODRIGUES, G.G., COELHO DE SOUZA, G.P. & WÜRDIG, N.L. Efeito do corte de Typha domingensis: resposta dos macroinvertebrados bentônicos e a regeneração da macrófita. Biota Neotrop. 12(3):http://www.biotaneotropica.org.br/v12n3/pt/abstract?article+bn03012032012Resumo: As áreas úmidas são importantes, pois apresentam alta biodiversidade e são consideradas pelos órgãos ambientais áreas de proteção permanente devido à sua importância para conservação. No Sul do Brasil a macrófita aquática Typha domingensis é colhida para ser usada na fabricação de artesanato, sendo uma fonte de renda importante para pequenos agricultores. Este trabalho teve como objetivo testar o efeito de corte de T. domingensis sobre os macroinvertebrados bentônicos, bem como sobre a regeneração da macrófita. Para avaliar o efeito do corte foram analisadas pequenas áreas (1 m²) em uma formação de T. domingensis onde comparou-se o tratamento de corte com tratamentos controle. Macroinvertebrados foram amostrados com um "corer" na seguinte sequência de tempo após o corte, em cada tratamento: um dia, 26 dias, 60 dias, 89 dias e 182 dias. A regeneração da macrófita foi monitorada através de medições mensais em cada tratamento. Não houveram diferenças significativas na densidade de macroinvertebrados entre os tratamentos (ANOVA, p < 0.05). Entre os 23 táxons i...

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“…analysis of similarities (ANOSIM) (Clarke & Green, 1988;Clarke, 1993), nonmetric multidimensional scaling (MDS) (Field, Clarke & Warwick, 1982;Clarke, 1993), and similarities percentage analysis (SIMPER) (Clarke, 1993).…”

Section: Statistical Analysesmentioning

confidence: 99%

An assessment of the impact of copper mine tailings disposal on meiofaunal assemblages using microcosm bioassays

Lee

Correa

2007

Marine Environmental Research

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Microcosms were used to assess the impact of copper mine tailings disposal on the littoral meiofaunal assemblages of the Atacama region of northern Chile. The specific purpose was to establish a cause and effect relationship between the elevated copper concentrations and altered meiofaunal assemblages observed at the study sites. Meiofaunal assemblages were exposed to a series of copper concentrations to assess general toxicity, both densities and taxa diversities decreased with increasing copper. Natural coarse sediments were mixed with a tailings substitute to assess the physical impact of the tailings dumping on meiofaunal assemblages. Meiofaunal assemblage densities increased with increasing amounts of tailings substitute, entirely due to an increase in surface utilising foraminiferans. However, taxa diversities decreased as the interstitial spaces became blocked. Finally, the microcosms were used to conduct bioassays of sediments and seawaters from the impacted sites. The sediments from the impacted sites proved to be toxic resulting in reduced meiofau- Preprint submitted to Elsevier Science 1 November 2006ACCEPTED MANUSCRIPT nal densities and taxa diversities. Seawater samples did not prove to be significantly toxic. The use of microcosms has allowed the effects of the physical and chemical components of tailings to be assessed individually, which was not possible in the field. Additionally, it allowed a cause and effect relationship to be established between elevated concentrations of porewater copper observed in the field and the reduced densities and taxa diversities of the meiofaunal assemblages observed at the same sites.

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A Practical Strategy for Analysing Multispecies Distribution Patterns

Cited by 1,522 publications

References 24 publications

Short-term changes in a microplankton community in the Chukchi Sea during autumn: consequences of a strong wind event

Short-term changes in a microplankton community in the Chukchi Sea during autumn: consequences of a strong wind event

Effect of Typha domingensis cutting: response of benthic macroinvertebrates and macrophyte regeneration

An assessment of the impact of copper mine tailings disposal on meiofaunal assemblages using microcosm bioassays

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