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Shoreline construction - scenario based effects on fish

Results from the construction scenario analyses in PREHAB show that coastal constructions in the form of jetties and marinas have a strong overlap with fish recruitment habitats. Recruitment habitats for perch may be fully exploited by boating activities already in 100 years. Observed rates of construction are even higher in some areas, suggesting that available perch habitats may be completely exploited already in fully 60 years.

PREHAB scenario analyses is based on data from five subareas in the archipelago of the northwest Baltic Proper in Sweden (see map below). Ranging from sparsely populated to densely built-up areas in different archipelago zones with a varying degree of accessibility, they are considered representative for the archipelago as a whole.

Map of study areas in PREHAB scenarios on constructionMap of study area for scenario analyses on coastal construction, including the five subareas.

One percent is exploited - every year
Based on the rate of shoreline construction in combination with the overlay analysis of constructions and fish habitats, we estimated that on average about one percent of available fish recruitment habitats were constructed annually during the period 1986-1999 along shores classified as having clear indication of construction or higher. See figure below. For the highest construction class 5, the yearly rate of affected fish habitats was on average almost 0.2 percent.

 Results scenarios

Yearly percent exploitation of perch (Perca fluviatilis) recruitment habitats at different levels of shoreline construction in five study areas in Stockholm archipelago. Indication of construction is based on the density of marinas along the shoreline. Error bars show standard deviations for different effect distances (100, 200 and 500 m) used in the calculations. Time period is 1986 to 1999. "avg" refers to average construction rate in the study areas, while "high" refers to the rate in the most constructed area.


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