Disturbance-related patterns in unstable rocky benthic habitats of the north-eastern Baltic coast

Liversage, Kiran; Kotta, Jonne

doi:10.3176/proc.2015.1.07

Cited by 10 publications

(9 citation statements)

References 36 publications

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“…Similarly to our results (Fig. 6), Grzelak & Kuklinski (2010) found a higher probability of the presence of organisms on large and medium rocks than on small rocks, confirming that in the Baltic Sea coastal habitat larger rocks are more stable and likely to provide a better substrate for community development (Liversage & Kotta, 2015). In higher salinity, where Ordination derived from Bray-Curtis measures based on square-root transformed abundance data for each subsample per sampling location.…”

Section: Discussionsupporting

confidence: 71%

Spatial pattern of hydrolittoral rock encrusting assemblages along the salinity gradient of the Baltic Sea

Grabowska

Kukliński

2015

Hydrobiologia

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This study compared the diversity parameters and structures of encrusting assemblages in two habitats situated at two levels of shallow rocky shore: hydrolittoral and littoral along the Baltic Sea system. We investigated the variability and level of distinctiveness of the hydrolittoral encrusting fauna based on species biodiversity and distribution, and compared these features with those of communities inhabiting the adjacent shallow littoral zone (3-m depth). Structural similarities and differences between the encrusting assemblages from adjacent hydrolittoral and littoral zones were studied within 14 locations distributed along the northern coastline of the Baltic Sea. Multivariate analysis indicates that salinity had the greatest influence on the structure of the investigated assemblages. Most of the observed hydrolittoral assemblages contained the same species as the littoral zone. This result indicated a shared common species pool with similar large-scale patterns of species distributions with some variability in the dominating species between zones. The similarity between species composition of the hydrolittoral and littoral assemblages decreased with increase of salinity. Additionally, with higher species richness and the occurrence of marine specialists adapted to hydrolittoral conditions, the role of the rock size in the frequency of species occurrence and assemblage diversity was less significant.

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Section: Discussionsupporting

confidence: 71%

Spatial pattern of hydrolittoral rock encrusting assemblages along the salinity gradient of the Baltic Sea

Grabowska

Kukliński

2015

Hydrobiologia

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“…On intertidal reefs consisting of unstable substrata such as boulders, the patterns caused by disturbance are well known [21, 27, 28]. In this study, patterns were observed of disturbance, and the provision of new ecological resources via disturbance, on a rocky shore in South Australia characterised by large boulders.…”

Section: Introductionmentioning

confidence: 91%

“…Ecological processes such as competition, predation and grazing can leave distinct patterns, allowing inference of the spatiotemporal extent of those processes by observing indicative patterns [ 24 – 26 ]. On intertidal reefs consisting of unstable substrata such as boulders, the patterns caused by disturbance are well known [ 21 , 27 , 28 ]. In this study, patterns were observed of disturbance, and the provision of new ecological resources via disturbance, on a rocky shore in South Australia characterised by large boulders.…”

Section: Introductionmentioning

confidence: 99%

First evidence of biogenic habitat from tubeworms providing a near-absolute habitat requirement for high-intertidal Ulva macroalgae

Liversage

2017

PLoS ONE

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Disturbances in ecological systems can cause new resources to become available and can free the resources held by strongly competitive species. In intertidal boulder fields, wave-action causes disturbance by overturning boulders and freeing space for re-colonisation. In this study, mensurative experiments showed that boulder disturbance may also cause new biogenic-habitat resources to become available, if pre-disturbance boulders originally had tubeworm encrustations on their undersides. On the high-shore of a South Australian rocky coast, a small proportion of boulders had extensive encrustations of serpulid and spirorbid worm-tubes on their uppersides, and were likely to have recently been overturned, as spirorbid tubeworms are almost always only underneath boulders while living. Ulva macroalgae was absent from all boulders, except those with worm-tubes, where up to 61% Ulva cover was observed. Many boulders with tubes did not, however, have much algae, and this was likely caused by grazing. While limpets were seldom observed attached to tube encrustations, snails such as Nerita atramentosa and Bembicium nanum were equally abundant on and off tubes. N. atramentosa was likely the main grazer, as its densities were negatively correlated with Ulva cover. The mechanism causing association of Ulva and worm-tubes is unknown, but may be related to retention of moisture or algal spores within the complex topography of the tubes. Alternatively, some tubes may still have been living and providing nutrients for Ulva from excretory products. This study takes the first step towards understanding a very distinct habitat requirement which allows an important alga to persist in the hostile environment of the rocky-intertidal high shore.

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“…Consequently, they are important contributors to coastal biodiversity and high benthic production. These habitats provide valuable feeding areas, and spawning and nursing grounds for fish [1][2][3]. Human impact on coastal habitats is increasing and benthic communities living in these environments are particularly affected [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Limitations of Boulder Detection in Shallow Water Habitats Using High-Resolution Sidescan Sonar Images

2019

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Stones and boulders in shallow waters (0–10 m water depth) form complex geo-habitats, serving as a hardground for many benthic species, and are important contributors to coastal biodiversity and high benthic production. This study focuses on limitations in stone and boulder detection using high-resolution sidescan sonar images in shallow water environments of the southwestern Baltic Sea. Observations were carried out using sidescan sonars operating with frequencies from 450 kHz up to 1 MHz to identify individual stones and boulders within different levels of resolution. In addition, sidescan sonar images were generated using varying survey directions for an assessment of range effects. The comparison of images of different resolutions reveals considerable discrepancies in the numbers of detectable stones and boulders, and in their distribution patterns. Results on the detection of individual stones and boulders at approximately 0.04 m/pixel resolution were compared to common discretizations: it was shown that image resolutions of 0.2 m/pixel may underestimate available hard-ground settlement space by up to 42%. If methodological constraints are known and considered, detailed information about individual stones and boulders, and potential settlement space for marine organisms, can be derived.

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Disturbance-related patterns in unstable rocky benthic habitats of the north-eastern Baltic coast

Cited by 10 publications

References 36 publications

Spatial pattern of hydrolittoral rock encrusting assemblages along the salinity gradient of the Baltic Sea

Spatial pattern of hydrolittoral rock encrusting assemblages along the salinity gradient of the Baltic Sea

First evidence of biogenic habitat from tubeworms providing a near-absolute habitat requirement for high-intertidal Ulva macroalgae

Limitations of Boulder Detection in Shallow Water Habitats Using High-Resolution Sidescan Sonar Images

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