Abstract
In the last years, increasing interest has been dedicated to the quality assessment of brackish-water systems. Traditionally, fish community is an important biological element used to assess the quality status of transitional water bodies. In this study, we analysed the effect of anthropogenic pressures on the population of a small teleost, the sand smelt Atherina boyeri, in a Mediterranean lagoon by means of body condition. Fish were sampled once a year during the period 2010–2012, in 32 sampling sites, and for each specimen individual body condition factor was estimated. A negative significant correlation was found between condition factor and pressures related to alteration of the hydrographic regime, while a significant positive correlation was found with trophic status indicators and fishery activities. Therefore, morphological and hydrological alteration of coastal lagoons, modifying the quality and the availability of resources, seems to influence the health of resident populations.
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Acknowledgments
We would like to thank T. Ghenda, A. Longo and E. Lugnan for their precious help during the field activities, and G. Mattassi for his supervision. The collection of data used in the present work was funded by ARPA FVG, as part of the monitoring activities carried out for the implementation of the WFD.
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Appendices
Appendix A
Appendix B
Pressure | Indicator | Measure | Degree of changes | Note | |||||
---|---|---|---|---|---|---|---|---|---|
No change (0) | Very low (1) | Low (3) | Medium (5) | High (7) | Very high (9) | ||||
Coastline morphological change | Intertidal | % of intertidal area lost between 1954 and 2006 (Fontolan et al. 2012) | Increase | No change | < 1% lost since 1850 | ≥ 1% and < 5% lost | ≥ 5% é < 10% lost | ≥ 10% lost | Fixed in time |
Coastline | Relative change in bottom depth between 1927 and 2002 (Sarretta et al. 2010), taking a variation of ±0.75 m as minimum significant change | No development | < 5% of the coastline impacted by industrial or urban activities | ≥ 5% and < 30% | ≥ 30% and < 60% | ≥ 60% and < 90% | ≥ 90% | ||
Hydro | % of area affected by interferences with the hydrographic regime | No construction | < 5% of the intertidal and sub-tidal area affected | >=5% and < 10% | >=10% and < 20% | >=20% and < 40% | >=40% |
No resource use (0) | Very low (1) | Low (3) | Medium (5) | High (7) | Very high (9) | ||||
---|---|---|---|---|---|---|---|---|---|
Resource use change | Aquaculture | % of area covered by clam farming | No fish farming | < 1% of the intertidal and sub-tidal area covered | ≥ 1% and < 10% | ≥ 10% and < 30% | ≥ 30% and < 50% | ≥ 50% | Fixed in time |
Fisheries | number of traps km−2 | No fishery activities | < 10% of the surface of WB affected by fishery | ≥ 10% and < 30% | ≥ 30% and < 60% | ≥ 60% and < 90% | ≥ 90% | ||
Marinas | number of berths km−2 | No marina | < 100 berths in marina | ≥ 100 and < 150 berths | ≥ 150 and < 300 berths | ≥ 300 and < 500 berths | ≥ 500 berths | ||
Intensity of port developments | Extent of ports | No harbour | < 500 m of quays | ≥ 500 and < 2 km | ≥ 2 and < 5 km | ≥ 5 and < 10 km | ≥ 10 km of quays |
Very low (1) | Low (3) | Medium (5) | High (7) | Very high (9) | |||||
---|---|---|---|---|---|---|---|---|---|
Environmental quality and its perception | Sediment | Sediment chemical status based on decree 56/2009 | 100% of substances below the EQS (Environmental Quality Standard) | One not priority substance fails to comply with EQSs | More than one not priority substance fails to comply with EQSs | One priority substance fails to comply with EQSs | More than one priority substance fails to comply with EQSs | More than one priority substance and one or more than one not priority substance fail to comply with EQSs | Fixed in time |
Benthos | M_AMBI index level (Muxika et al. 2007) | Normal | Normal | Normal | Recovering or deteriorating | Modified | Severely modified | Fixed in time | |
DIN | µg L−1 of dissolved inorganic nitrogen | Pressure calculated as seasonal average of concentration on a monthly basis | |||||||
RP | µg L−1 of reactive phosphorous | Pressure calculated as seasonal average of concentration on a monthly basis | |||||||
Chl-a | µg L−1 of chlorophyll-a | Pressure calculated as seasonal average of concentration on a monthly basis | |||||||
DO | % saturation of dissolved oxygen | Pressure calculated as seasonal average of concentration on a monthly basis |
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Cavraro, F., Bettoso, N., Zucchetta, M. et al. Body condition in fish as a tool to detect the effects of anthropogenic pressures in transitional waters. Aquat Ecol 53, 21–35 (2019). https://doi.org/10.1007/s10452-018-09670-4
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DOI: https://doi.org/10.1007/s10452-018-09670-4