Community structure of the intertidal meiofauna along a gradient of morphodynamic sandy beach types in southern Chile

Rodríguez, Jonatan; López, J.; Jaramillo, Eduardo

doi:10.4067/s0716-078x2001000400015

Cited by 34 publications

(37 citation statements)

References 21 publications

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“…There are many studies on the ecology of interstitial meiofauna in the world (Dye et al, 1981;Harkantra & Parulekar, 1989;Olafsson, 1991;Armonies & Reid, 2000;Rodriguez et al, 2001;Menn et al, 2002, Gheskiere et al, 20042005 a;Moreno et al, 2005;. In Brazil, the interest in sandy-beach meiofauna has been intensified in recent decades (Medeiros, 1984;1992;Silva et al, 1991;Bezerra et al, 1996;Corbisier et al, 1997;Esteves & Fonseca-Genevois, 1997;Wandeness et al, 1997;Esteves & Silva, 1998;Albuquerque & Genofre, 1997;Netto et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal changes in interstitial meiofauna on a sandy ocean beach of South America

et al. 2007

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A B S T R A C TSpatial and temporal patterns of meiofauna community from a Brazilian sandy beach were investigated. The objective of this work was to analyze the meiofauna distribution using a statistical model that considers the biological data as variables, and granulometric characteristics, organic matter, and temperature as covariables. Four zones were sampled throughout one year in a Brazilian sandy beach and three sediment cores were taken monthly from each zone. The meiofauna was composed by 12 taxa, with tardigrades and nematodes comprising 92% of the total fauna. The meiofauna mean density varied from 1556.25 to 13125.25 ind.10 cm -2 , with the highest densities in December. The results of multiple regression showed that the mean effects of zones, vertical layers, and months on the organisms were significantly correlated with the principal taxa of meiofauna. The retention zone and the 0-10 cm layer presented the highest densities. The temporal distribution showed different patterns and some taxa were more abundant in the dry season, and others in the rainy season. Sedimentological variables had strong and significant effects on the meiofauna taxa. According to the results, physical variables at the retention zone create optimal living conditions for the meiobentos, making this zone an area that favors the basic and applied ecological studies. R E S U M OOs padrões de distribuição espacial e temporal da meiofauna em uma praia arenosa do Brasil foram analisados usando um modelo estatístico que considerou os dados biológicos como variáveis e as características granulométricas, % de matéria orgânica, temperatura como covariáveis. Quatro zonas litorais foram amostradas durante o período de um ano e três cores de sedimento foram coletados em cada zona. A meiofauna foi composta de 12 taxa principais e os Tardigrada e Nematoda representaram 92% da fauna total. A densidade média da meiofauna variou de 1.556,25 a 13.125,25 ind.10cm -2 , com as mais altas densidades em dezembro. Os resultados da regressão múltipla mostraram que os efeitos médios das zonas, estratos e meses nos organismos foram significativamente correlacionados com os principais grupos da meiofauna. A zona de retenção e o estrato de 0-10 cm apresentaram os mais altos valores de densidade. A distribuição temporal mostrou diferentes padrões, onde alguns taxa foram mais abundantes na estação seca e outros na estação úmida. As variáveis sedimentológicas tiveram um forte efeito significante sobre os grupos meiofaunísticos. As ótimas condições de vida da zona de retenção para o meiobentos fazem desta região uma área favorável para estudos de ecologia básica e aplicada.

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal changes in interstitial meiofauna on a sandy ocean beach of South America

et al. 2007

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“…Albertelli et al, 1999;Rodríguez et al, 2001;Gheskiere et al, 2005;Kotwicki et al, 2005aKotwicki et al, , 2005bLeonardis et al, 2008;Gomes and Filho, 2009;Sandulli et al, 2010). Our average meiofauna abundances (1.5 Â 10 4 ind m…”

Section: Discussionmentioning

confidence: 67%

The influence of submarine groundwater discharges on subtidal meiofauna assemblages in south Portugal (Algarve)

Encarnação

Leitão

Range

et al. 2013

Estuarine, Coastal and Shelf Science

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“…Nauplius was the most abundant group. The high densities of these organisms are common in intertidal zones of coarse sand reflective beaches (RODRIGUEZ et al, 2001). The high oxygen concentration characteristic of these environments is optimal for these organisms as they are highly sensitive to reductions in interstitial oxygen BROWN, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…The grain size characteristics and the energy and hydrodynamic conditions result in the formation of a system with extensive interstitial spaces, which in some cases comprise as much as 40% of the total sediment volume (MCLACHLAN; BROWN, 2006 (PLATT, 1977;SHARMA;WEBSTER, 1983;NICHOLAS;HODDA, 1999;ALBUQUERQUE et al, 2007;MARIA et al, 2012;DI DOMENICO et al, 2014). The sediment oxygen concentration in reflective beaches is assumed to be the environmental variable that directly influences the vertical distribution of meiofauna communities (BRAECKMAN et al, 2011), as it is a nonlimiting factor due to the great hydrodynamic force of the waves that break on the beach face (FENCHEL; RIEDL, 1970;RODRIGUEZ et al, 2001). The consequence of this assumption is the non-stratified distribution of meiofauna and Nematoda in reflective beach sediments.…”

Section: Mariana De Oliveira Martins* Tito Cesar Marques De Almeidamentioning

confidence: 99%

Vertical distribution of meiofauna on reflective sandy beaches

2015

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Extreme physical conditions usually limit the meiofauna occurrence and distribution in highly hydrodynamic environments such as reflective beaches. Despite sediment grains of the upper layers being constantly resuspended and deposited, the high energy of the swash zone besides depositing coarse sediments allows an ample vertical distribution of meiofaunal organisms. The effect of physical, chemical and sediment variables on the vertical distribution of meiofaunal organims and nematodes was analysed on two reflective exposed beaches. Sampling was conducted at three sampling points on each beach in the swash zone. The sediment collected was divided into four 10-cm strata (0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm). The statistical differences between strata due to factors previously established (i.e. meiofaunal composition, density of most abundant taxa) were tested using a hierarchical PERMANOVA applied under similarity and euclidian distances. An inverse relation among average grain size, content of organic matter and sediment sorting was evident. Coarser sediment characterized the upper layers, while at deeper layers the sediment was very poorly sorted and presented a higher content of organic matter. A similar pattern in the vertical distribution of meiofaunal and nematofaunal composition and density was detected. The lowest densities were associated with the first stratum (0-10 cm), highly affected by hydrodynamics. The vertical distribution of organisms was statistically different only when the interaction among factors was considered. This result suggests that zonation and vertical distribution of meiofaunal organisms are determined by the within-beach variability. Descriptors: Reflective beach, Vertical distribution, Spatial distribution, Meiofauna, Nematoda, Sediment. AbstrAct Mariana de Oliveira Martins*, Tito Cesar Marques de Almeida, Maikon Di DomenicoA ocorrência e distribuição da meiofauna em ambientes com alta energia hidrodinâmica, tais como praias refletivas, são normalmente limitadas por extremos físicos. Apesar de as camadas superficiais do sedimento serem afetadas, a alta energia na zona de espraiamento e a presença de areia grossa possibilitam que a meiofauna tenha ampla distribuição vertical. Para testar o padrão de distribuição vertical da meiofauna e de nemátodos em relação às variáveis físicas, químicas e sedimentológicas, duas praias refletivas expostas foram analisadas. As coletas ocorreram na zona de espraiamento em três pontos de cada uma dessas praias. O sedimento coletado foi dividido em quatro estratos de 10 cm (0-10, 10-20, 20-30 e 30-40 cm). A diferença entre os estratos foi analisada com o uso de PERMANOVA com modelo hierarquizado. A análise foi aplicada em matrizes de similaridade e de distância euclidiana, para estudo da composição da meiofauna e densidades específicas de táxons mais abundantes, respectivamente. O padrão granulométrico evidenciado caracterizou-se pela relação inversa entre o tamanho médio do grão e o teor de matéria orgânica aliado ao grau de selecionamento. Sedime...

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Community structure of the intertidal meiofauna along a gradient of morphodynamic sandy beach types in southern Chile

Cited by 34 publications

References 21 publications

Spatial and temporal changes in interstitial meiofauna on a sandy ocean beach of South America

Spatial and temporal changes in interstitial meiofauna on a sandy ocean beach of South America

The influence of submarine groundwater discharges on subtidal meiofauna assemblages in south Portugal (Algarve)

Vertical distribution of meiofauna on reflective sandy beaches

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