Effects of boating activities on aquatic vegetation in the Stockholm archipelago, Baltic Sea

Eriksson, Britas Klemens; Sandström, Alfred; Isæus, Martin; Schreiber, Henrik; Karås, Peter

doi:10.1016/j.ecss.2004.05.009

Cited by 89 publications

(76 citation statements)

References 41 publications

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“…Although sedimentation on eggs and larvae increases mortality (e.g., Auld and Schubel 1978), we consider indirect effects via changes in vegetation to be the most likely mechanism for degrading the production potential of fish reproduction habitats. Shoreline constructions and associated boating reduce vegetation cover, height, and species richness, most likely via resuspension of surface sediments and associated increases in turbidity (Eriksson et al 2004;Sandström et al 2005). Structural habitat complexity provides protection from predation and increases food abundance (Grenouillet and Pont 2001), and the physical changes following boating activities can thus be expected to reduce the quality of the fish reproduction habitat (Sandström et al 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Also the increased population, together with a change in recreational habits, has led to an increase in boating and associated construction of jetties and marinas, as well as dredging to gain access by boat to shallow shores. Recreational boating and ferry traffic have been shown to lead to a decrease in vegetation cover and change in the composition of the submerged vegetation community (Eriksson et al 2004), which can adversely affect the juvenile fish community that utilizes these shallow, sheltered areas for reproduction, i.e., as spawning and nursery areas (Jude and Pappas 1992;Sandström et al 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Indirectly, the primary vector appears to be habitat degradation, i.e., a reduction in production following changes in habitat structure and function caused by effects on local hydrology and the vegetation community. As boating changes both vegetation composition and cover, probably mainly through resuspension of surface sediments leading to turbidity, fish reproduction habitats in the vicinity of marinas and ferry routes produce fewer recruits than pristine habitats (Eriksson et al 2004;Sandström et al 2005). Also, dredging may negatively alter temperature conditions, but the effect on fish reproduction is difficult to separate from boating, as dredging is used to increase boat access (Sandström et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Shoreline development and degradation of coastal fish reproduction habitats

Sundblad

Bergström

2014

AMBIO

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Coastal development has severely affected habitats and biodiversity during the last century, but quantitative estimates of the impacts are usually lacking. We utilize predictive habitat modeling and mapping of human pressures to estimate the cumulative long-term effects of coastal development in relation to fish habitats. Based on aerial photographs since the 1960s, shoreline development rates were estimated in the Stockholm archipelago in the Baltic Sea. By combining shoreline development rates with spatial predictions of fish reproduction habitats, we estimated annual habitat degradation rates for three of the most common coastal fish species, northern pike (Esox lucius), Eurasian perch (Perca fluviatilis) and roach (Rutilus rutilus). The results showed that shoreline constructions were concentrated to the reproduction habitats of these species. The estimated degradation rates, where a degraded habitat was defined as having C3 constructions per 100 m shoreline, were on average 0.5 % of available habitats per year and about 1 % in areas close to larger population centers. Approximately 40 % of available habitats were already degraded in 2005. These results provide an example of how many small construction projects over time may have a vast impact on coastal fish populations.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shoreline development and degradation of coastal fish reproduction habitats

Sundblad

Bergström

2014

AMBIO

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“…The effect of sediment disturbance in the Lough can also explain the better sorting of particles, with an increase of the silt/clay fraction in the inner Lough and a decrease in the outer Lough, in comparison with 1992, that was also reflected in the distribution of A. tamarense cysts. Boat-generated disturbance has been shown to affect macrobenthic fauna (Bishop & Chapman, 2004) and macroscopic vegetation (Eriksson et al, 2004) by increased wave action, turbidity and removal of sediment. Besides increasing germination potential of cysts, disturbance increases turbidity in the water column potentially affecting the growth and survival of A. tamarense motile cells and reducing cyst production.…”

Section: Cyst Distributionmentioning

confidence: 99%

A comparative study ofAlexandrium tamarensecyst distribution in Belfast Lough

Blanco¹,

Lewis²

2014

European Journal of Phycology

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Alexandrium tamarense is a cyst-forming dinoflagellate that can cause toxicity in shellfish. Belfast Lough, in northeast Ireland, has experienced toxicity events due to the presence of A. tamarense, which are monitored because of shellfish farms in the Lough. Since 1992 anthropogenic influences on the Lough have changed with the introduction of a 'fast cat' ferry service and an increase in mussel farming. In 2002 Belfast Lough was surveyed for A. tamarense cyst distribution in the sediments and the results are compared to a previous cyst survey carried out in the Lough in 1992. Cyst numbers were generally lower in 2002 than in 1992 (t-test, P < 0.01). The highest concentration found in 2002 was 1058 cysts g −1 dry sediment compared with 3330 in 1992.Although sediment disturbance increased in the period between the surveys and plays a role in cyst distribution, A. tamarense cysts are still present in the seabed of the Lough. These cysts remain an important repository of inoculating cells for A. tamarense blooms that have not been removed by the recent anthropogenic activity in the Lough and therefore the requirement for monitoring remains. Comparisons between cyst counts per volume of wet sediment and per weight of dry sediment were carried out, and although the first is needed for ecological studies allowing a deeper analysis, it is also recommended that cyst counts per dry weight of sediment are always reported for wider comparative purposes.

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“…Suboptimal irradiance triggers extensive morphological (shade-tolerance) (Barko et al 1982, Pilon and Santamaría 2001, Asaeda et al 2004) and architectural (shade-avoidance) (Goldsborough and Kemp 1988, Asaeda et al 2004, Wolfer et al 2006 modifications with the aim of boosting the capture of radiation. Mechanical disturbance also can significantly affect the distribution of macrophytes, mostly affecting their morphological and habitual properties (Eriksson et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Morphological and photosynthetic acclimation of Potamogeton perfoliatus to different environments in Lake Balaton

Tóth

Vári

Lugossi

2011

Oceanological and Hydrobiological Studies

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Comparative significance and synchronicity of morphological and photosynthetic adjustments of Potamogeton perfoliatus to shorespecific environments were examined on plants growing at the maximum depth of colonisation of the northern and southern shores of Lake Balaton. The shore-specific environments did not affect photophysiological parameters: the photosynthesis of plants on both shores was high, coupled with low respiration and compensation irradiances. In contrast, morphological and habitual differences between the shores were significant: plants of the shady, northern shore had lighter, but larger leaves, and longer internodes concentrated in the apex of the plants. Thus, photophysiological variability of Potamogeton does not follow its morphological differentiation.

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Effects of boating activities on aquatic vegetation in the Stockholm archipelago, Baltic Sea

Cited by 89 publications

References 41 publications

Shoreline development and degradation of coastal fish reproduction habitats

Shoreline development and degradation of coastal fish reproduction habitats

A comparative study ofAlexandrium tamarensecyst distribution in Belfast Lough

Morphological and photosynthetic acclimation of Potamogeton perfoliatus to different environments in Lake Balaton

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