Effects of pollution on holdfast macrofauna of the kelp Ecklonia radiata :discrimination at different taxonomic levels

Smith, Stephen; Simpson, R.D.

doi:10.3354/meps096199

Cited by 51 publications

(30 citation statements)

References 17 publications

(28 reference statements)

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“…Our study also benefited from a combination of multivanate and univariate analyses to examine changes in the structure of the encrusting assemblages. The effects of ocean ouffalls on biological assemblages have been described using multivanate (Clarke 1993. Smith & Simpson 1993 or univariate techniques (Otway et al 1996a); however, the use of a combination of these techniques is rare (but see Chapman et al 1995, Otway et al 1996b).…”

Section: Discussionmentioning

confidence: 99%

Rapid changes in encrusting marine assemblages exposed to anthropogenic point-source pollution:a 'Beyond BACI' approach

Roberts¹,

Smith²,

Ajani³

et al. 1998

Mar. Ecol. Prog. Ser.

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Cover of and the number of species in encrusting macrobenthic assemblages inhabiting temperate rocky reefs m the vicinity of an ocean outfall changed rapidly following the discharge of secondary treated sewage effluent. Within 3 mo of the commissioning of the outfall, significant reductions in the cover of crustose and foliose algae were apparent when this outfall area was compared to 2 reference locations. The cover of several species of sponge, including Cymbastela concentrica, Geodinella sp. and Spongia sp., also underwent marked declines coincident with the commissioning of the outfall. Only 1 category of cover increased significantly at the outfall; this was a nondescript matrix comprising silt and microorganisms, which doubled its representation to almost 60%. We d~d not detect significant declines in the cover and number of specles of sponges or total fauna, however. A 'Beyond BACI' experimental design was used to deternune the environmental unpact because of the great spatial and temporal variability in these shallow water (-20 m) encrusting communities. Photographic samples were taken in 3 penods, the first pre-commissioning and the other 2 post-commissiorung Multivariate analyses revealed marked shifts in the structure of the assemblage at the outfall relative to the reference locations; these shifts were clearly depicted by a non-metric multi-dimensional scaling (nMDS) plot. A SIMPER analysis confirmed that the overall composition of the community at the outfall changed from one in which algae and sponges were well represented to an assemblage dominated by silt and ascidians.

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Section: Discussionmentioning

confidence: 99%

Rapid changes in encrusting marine assemblages exposed to anthropogenic point-source pollution:a 'Beyond BACI' approach

Roberts¹,

Smith²,

Ajani³

et al. 1998

Mar. Ecol. Prog. Ser.

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“…Factors such as water movement (Fenwick, 1976;Gibbons, 1988), depth (Krapp-Schickel, 1993;Jacobucci & Leite, 2002), accumulation of detritus (Moore, 1973), and pollution (Smith & Simpson, 1993) can have a direct effect on the distribution and abundance of the fauna associated with macrophytes. However, as these factors can modify the morphological characters (Paula, 1988) and growth and mortality rates of the macrophytes (Jernakoff et al, 1996), the effects on associated animals can occur in an indirect manner (Dommasnes, 1968).…”

Section: Introductionmentioning

confidence: 99%

The role of epiphytic algae and different species of Sargassum in the distribution and feeding of herbivorous amphipods

Jacobucci¹,

Pereira-Leite²

2014

lajar

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ABSTRACT. The presence of particular algal species can directly influence the distribution and abundance of mesoherbivores. The aim of this study was to answer the following questions: Do Sargassum beds of different localities show variation in the load of epiphytic algae? Do Sargassum beds of different localities show variation in the density of herbivore amphipods? Does the density of these amphipods in the same algal bed vary with epiphyte load? Are species of Sargassum and their epiphytes equally consumed by amphipods? The collections were carried out in three infralitoral algal beds in southeastern Brazil. Fronds of Sargassum were collected at each algal bed and the associated ampithoid and hyalid amphipods were separated, identified and counted. Sargassum fronds and epiphytes were identified, dryed and weighted. Experiments were carried out to determine the consumption of Sargassum species and epiphytes by amphipods. The weight of the epiphytes Hypnea musciformis and Dyctiopteris delicatula and the density of amphipods were different among sampling sites. There was a relationship between amphipod density and epiphyte weight at two sampling sites. The four amphipod species tested consumed algae, but showed different patterns of consumption. Despite consuming the epiphytes, the ampithoids preferentially feed on the three species of Sargassum, while Hyale nigra had a preference for Hypnea musciformis.

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“…grazers, predators, detritivores). Such assemblages have great potential for measuring changes to biodiversity (Gee & Warwick 1996) and assessing environmental impacts (Smith & Simpson 1993). A diverse component of the assemblage can be found in small patches of habitat under a variety of different environmental conditions, they can develop in natural and artificial habitats placed in different areas (Costello & Thrush 1991), and they can potentially be transplanted from site to site.…”

Section: Introductionmentioning

confidence: 99%

Comparison of patterns of spatial variation of microgastropods between 2 contrasting intertidal habitats

Olabarria¹,

Chapman²

2001

Mar. Ecol. Prog. Ser.

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Small-scale spatial variation in the distribution of the macrofauna of marine intertidal shores has long been recognized, but there have been few quantitative studies about the scales of patchy distribution of the microbenthos on rocky shores. Patchiness has important implications for comparative and descriptive studies of distribution and abundance because it confounds comparisons of abundance at the largest spatial scales unless the smaller scales are appropriately incorporated into the sampling designs. Spatial variation in the distribution of a number of species of intertidal microgastropods across 2 different habitats (sediment and coralline turf) in Botany Bay, Australia, is described using a nested, hierarchical sampling design. Significant variation was detected mainly at small scales, ranging from less than 1 to 10 m. Moreover, the species showed different patterns of variation depending on the type of habitat and the time of sampling. There was no relation between these patterns and the taxonomic relations of the species. These data illustrate the scales of variability that must be considered when planning long-term or baseline investigations of microbenthos to assure that the study adequately represents different habitats and that subsequent ecological inferences are valid.

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Effects of pollution on holdfast macrofauna of the kelp Ecklonia radiata :discrimination at different taxonomic levels

Cited by 51 publications

References 17 publications

Rapid changes in encrusting marine assemblages exposed to anthropogenic point-source pollution:a 'Beyond BACI' approach

Rapid changes in encrusting marine assemblages exposed to anthropogenic point-source pollution:a 'Beyond BACI' approach

The role of epiphytic algae and different species of Sargassum in the distribution and feeding of herbivorous amphipods

Comparison of patterns of spatial variation of microgastropods between 2 contrasting intertidal habitats

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