Long-term changes in macrozoobenthos in the Åland archipelago, northern Baltic Sea

Perus, Jens; Bonsdorff, Erik

doi:10.1016/j.seares.2003.07.004

Cited by 53 publications

(51 citation statements)

References 35 publications

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“…The invading polychaete M. neglecta has increased in abundance considerably during the past decade in different parts of the Baltic Sea (Zettler 1996;Cederwall et al 1999;Laine et al 2003;Perus and Bonsdorff 2004). This worm, tolerant to low oxygen levels, forms highly branched burrow networks deeper into to the sediment than most other common Baltic Sea macroinvertebrates (Hietanen et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Indications of Recovery from Hypoxia in the Inner Stockholm Archipelago

Karlsson

Jonsson

Lindgren

et al. 2010

AMBIO

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Improved benthic conditions compared to the 1990s were found during benthic investigations, including sediment and benthic macrofauna in the inner Stockholm archipelago during 2008. In the 1990s, these areas were dominated by black and laminated surface sediments and very sparse fauna. A clear relationship was found when comparing sediment status with the benthic macrofauna. Reduced surface sediment and impoverished macroinvertebrate community was only found at one sampling station representing an enclosed part of the inner archipelago, whereas the other seven stations, with depths ranging from 20 to 50 m, had oxidized surface sediments and considerable biomasses of benthic macrofauna (6-65 g m -2 ) dominated by the invading polychaete Marenzelleria neglecta. An extrapolation of the results shows that, within the investigated area, the coverage of reduced surface sediments had decreased from approximately 17% in the late 1990s to 4% in 2008.

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Section: Discussionmentioning

confidence: 99%

Indications of Recovery from Hypoxia in the Inner Stockholm Archipelago

Karlsson

Jonsson

Lindgren

et al. 2010

AMBIO

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“…During the last few decades, soft-bottom macrofaunal communities of the northern Baltic Sea have experienced broad-scale changes, driven by eutrophication and changes in the deep-water salinity (Laine et al 1997). Monoporeia, previously a numerical dominant of benthic communities over large areas, has drastically decreased, while Macoma has gradually increased in importance in many coastal habitats and may form almost monospecific communities (Perus & Bonsdorff 2004). Furthermore, polychaetes from the genus Marenzelleria have spread rapidly since their introduction to the Baltic Sea in the 1980s (Bastrop & Blank 2006).…”

Section: Methodsmentioning

confidence: 99%

“…Based on the findings of this study, the species most detrimental to Bosmina is Macoma, followed by Monoporeia; Marenzelleria is the least detrimental. Accordingly, the rapid spread of the polychaetes with a simultaneous crash of the amphipods, as demonstrated in the Åland archipelago (Perus & Bonsdorff 2004) and the Gulf of Riga (Cederwall et al 1999), should be favourable for Bosmina. In the study area, on the other hand, the recent change from moderate Monoporeia abundances (1000 to 6000 ind.…”

Section: Long-term Implicationsmentioning

confidence: 99%

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Effects of bioturbation by three macrozoobenthic species and predation by necto-benthic mysids on cladoceran benthic eggs

Viitasalo¹

2007

Mar. Ecol. Prog. Ser.

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The effects of bioturbation and predation by the amphipod Monoporeia affinis, the bivalve Macoma balthica and the polychaetes Marenzelleria spp. were studied on the number, vertical distribution and hatching of benthic eggs (ephippia) of the cladoceran Bosmina longispina maritima. It was hypothesised that the 3 functionally different macrobenthic species affect Bosmina ephippia to different degrees. In addition, it was hypothesised that macrofaunal bioturbation either inhibits or enhances predation by the necto-benthic mysid Mysis mixta on cladoceran benthic eggs. M. affinis and M. balthica caused a 48 and 23% decrease in the total number of Bosmina ephippia, respectively, indicating egg predation. In addition, M. balthica extended the distribution of eggs into deeper sediment layers. Both M. affinis and M. balthica suppressed the daily hatching rate of Bosmina, and the effect of the bivalves (reduction 92%) was stronger than that of the amphipods (34 to 78%). None of the benthic species promoted the predation of mysids on Bosmina eggs. Instead, both M. affinis and M. balthica reduced the number of ephippia in the sediment surface (by 79 and 43%, respectively), implying that these species decrease the ability of mysids to feed on cladoceran benthic eggs. M. balthica was the most harmful species for the recruitment of Bosmina, whereas the nonindigenous Marenzelleria spp. did not affect ephippia.

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“…Sparrevik & Leonardsson 1995, Rumohr et al 2001, Bergström et al 2002, Josefson 2009, there is a clear lack of planned studies on scaling issues from the Baltic Sea, although some scale-related results indeed have been achieved as byproducts from studies with other main focuses (e.g. Kraufvelin et al 2001, Bonsdorff et al 2003, Laine 2003, Perus & Bonsdorff 2004. Symptomatic for most of these studies is that the special features of the Baltic Sea, such as clear gradients of salinity, organic enrichment and oxygen levels, seem to be driving much of the observed community patterns over space and time (Bonsdorff & Pearson 1999, Bonsdorff 2006) and this will also apply to some extent to the present study.…”

Section: Introductionmentioning

confidence: 99%

Scale-dependent distribution of soft-bottom infauna and possible structuring forces in low diversity systems

Kraufvelin

Perus²,

Bonsdorff³

2011

Mar. Ecol. Prog. Ser.

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Despite their central roles in ecology, patterns and scales of variation in the distribution of species and their densities are seldom satisfactorily described for most ecosystems. This is mainly due to spatial structures being scale-dependent across broad ranges of scales with partly different processes operating at different scales. In this study, scale-dependent distributional patterns in softsediment macrofaunal communities of naturally low species richness were studied on the Åland Islands, northern Baltic Sea, in 3 model areas (I, II and III) representing different environmental regimes with regard to openness (water renewal rate), depth, and organic and nutrient content as well as an increasing intrasite variability. A systematic grid design comprising 64 biotic and 16 abiotic sampling points, hierarchically arranged at 3 (at distances 10, 100 and 1000 m) and 2 spatial scales (100 and 1000 m), respectively, was used in each area. The intrasite distribution of macrofauna was predictably the most uniform in Area I, the least variable environmentally, followed by Area II, which was intermediate with respect to both abiotic and biotic variability, and then Area III, which was always the most variable area. This was true when analysed by both univariate and multivariate statistical means. When examining the contribution of each spatial scale to the total variance, most variability was observed at the smallest sampled level (10 m) for the majority of the studied variables. Despite a high overlap in species composition, the areas differed significantly in animal community structure. This was driven by both (1) the top-dominant species (Macoma, Mytilus, Monoporeia, Oligochaeta, Marenzelleria) and (2) the proportion and distribution of rare species. These systems with low diversity showed clear species distribution patterns driven by local environmental conditions, but also showed a substantial biotic component seen as the proportion and role of rare species and the high spatial variability observed at the smallest scale. Our understanding of spatial variability (or 'stability') is thus influenced by both the habitat and the species composition. The results are valuable for the refinement of sampling design, improved interpretation of monitoring programs (including detection of anthropogenic impact) and incorporation of scaling issues into questions of marine biodiversity and conservation.

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Long-term changes in macrozoobenthos in the Åland archipelago, northern Baltic Sea

Cited by 53 publications

References 35 publications

Indications of Recovery from Hypoxia in the Inner Stockholm Archipelago

Indications of Recovery from Hypoxia in the Inner Stockholm Archipelago

Effects of bioturbation by three macrozoobenthic species and predation by necto-benthic mysids on cladoceran benthic eggs

Scale-dependent distribution of soft-bottom infauna and possible structuring forces in low diversity systems

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