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  • 1
    Online Resource
    Online Resource
    pH dependent dissolution of sediment aluminum in six Danish lakes treated with aluminum
    Elsevier BV ; 2013
    In:  Water Research Vol. 47, No. 3 ( 2013-03), p. 1409-1420
    Details
    In: Water Research, Elsevier BV, Vol. 47, No. 3 ( 2013-03), p. 1409-1420
    Type of Medium: Online Resource
    ISSN: 0043-1354
    URL: Article
    DOI: 10.1016/j.watres.2012.12.004
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2013
    detail.hit.zdb_id: 202613-2
    detail.hit.zdb_id: 1501098-3
    SSG: 14
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  • 2
    Online Resource
    Online Resource
    Biodiversity and Sediment Contamination in Wet Stormwater Ponds Depending on Design and Catchment Characteristics
    MDPI AG ; 2021
    In:  Sustainability Vol. 13, No. 21 ( 2021-10-26), p. 11809-
    Details
    In: Sustainability, MDPI AG, Vol. 13, No. 21 ( 2021-10-26), p. 11809-
    Abstract: Stormwater ponds are a common way to handle stormwater and are used to retain pollutants through sedimentation. The ponds resemble small natural lakes and will be colonized by flora and fauna. How design with respect to age, ratio between wet volume and reduced catchment area and land use influences the retention and how biodiversity is affected was examined. Age and ratio were determined in 135 and 59 ponds, respectively, and 12 of these ponds were selected for studies of dry weight (DW), organic matter (OM), total phosphorus (TP) and aluminum (Al), zinc (Zn), copper (Cu), chromium (Cr), cadmium (Cd) and lead (Pb) in the sediment. Invertebrate biodiversity was determined by Shannon–Wiener index (H’) and Pielou Evenness (J). DW, OM, TP and metals in the sediment close to the outlet of the ponds were influenced by pond age and the volume/area ratio whereas the sediment in the inlet area was more affected by the catchment type. Biodiversity increased with increasing ratio, while age had no effect on the sediment biodiversity but some effect on the water phase biodiversity. Biodiversity decreased with higher OM and TP and tend to decrease with increasing metal content. Higher volume/area ratio results in less sediment accumulation which improves the biodiversity. More pollutants are accumulating with age, which negatively affects the biodiversity. In conclusion, pond ratio, catchment type and, to some extent, age effect the load of contaminants in the sediment and the pond biodiversity. Proper design and management are recommended as a mitigating measure.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    URL: Article
    DOI: 10.3390/su132111809
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2518383-7
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  • 3
    Online Resource
    Online Resource
    Influences of Urban Discharges and Urban Heat Effects on Stream Temperature
    MDPI AG ; 2023
    In:  Hydrology Vol. 10, No. 2 ( 2023-01-19), p. 30-
    Details
    In: Hydrology, MDPI AG, Vol. 10, No. 2 ( 2023-01-19), p. 30-
    Abstract: Urban areas with dark and impermeable surfaces are known to have a heating effect on air and still water compared to surrounding areas, called the urban heat island effect (UHI). UHI and stormwater discharges’ collective impact on stream temperature, especially regarding seasonal changes, is a less-studied field. In this study, the temperature effect of the urban village Aarslev on Stream Vindinge in Southern Denmark was examined. Loggers (ID A–L) were placed in Stream Vindinge in 2020–2021, measuring temperature (°C) and pressure (kPa). Outlets were analyzed with respect to origin: Direct stormwater outlets (rain ÷ basin), stormwater delayed by ponds (rain + basin), common overflow, and common sewage from WWTP. Data showed the stream temperature rise through Aarslev village in all months (except March) with 0.3–1.9 °C, most notably in the summer months. A one-way ANOVA confirmed that the upstream station A and downstream station K were significantly different (p-values 〈 0.001). No significant difference in temperatures between the different outlet types was found. An increase in stream temperature was observed in response to rain events, followed by a temperature decrease. This was assumed to be a “first heat flush”. This was speculated to mean less optimal conditions for trout and sensitive macroinvertebrates not because of heat shock, but rather to lower O2 concentrations and higher mineralization. River and lake temperatures are projected to increase, and this effect might become more pronounced. A decrease in stream temperature was observed after the village (station L). Therefore, it was concluded that the rise in temperature through the village was due to UHI.
    Type of Medium: Online Resource
    ISSN: 2306-5338
    URL: Article
    DOI: 10.3390/hydrology10020030
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2777964-6
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  • 4
    Online Resource
    Online Resource
    Resuspension behaviour of aluminium treated lake sediments: effects of ageing and pH
    Springer Science and Business Media LLC ; 2009
    In:  Hydrobiologia Vol. 636, No. 1 ( 2009-12), p. 203-217
    Details
    In: Hydrobiologia, Springer Science and Business Media LLC, Vol. 636, No. 1 ( 2009-12), p. 203-217
    Type of Medium: Online Resource
    ISSN: 0018-8158 , 1573-5117
    URL: Article
    DOI: 10.1007/s10750-009-9949-8
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2009
    detail.hit.zdb_id: 1478162-1
    detail.hit.zdb_id: 214428-1
    SSG: 12
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  • 5
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    Online Resource
    Evaluation of aluminum treatment efficiency on water quality and internal phosphorus cycling in six Danish lakes
    Springer Science and Business Media LLC ; 2015
    In:  Hydrobiologia Vol. 751, No. 1 ( 2015-6), p. 189-199
    Details
    In: Hydrobiologia, Springer Science and Business Media LLC, Vol. 751, No. 1 ( 2015-6), p. 189-199
    Type of Medium: Online Resource
    ISSN: 0018-8158 , 1573-5117
    URL: Article
    DOI: 10.1007/s10750-015-2186-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2015
    detail.hit.zdb_id: 1478162-1
    detail.hit.zdb_id: 214428-1
    SSG: 12
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  • 6
    Online Resource
    Online Resource
    Effects on biodiversity, physical conditions and sediment in streams receiving stormwater discharge treated and delayed in wet ponds
    Elsevier BV ; 2019
    In:  Limnologica Vol. 75 ( 2019-03), p. 11-18
    Details
    In: Limnologica, Elsevier BV, Vol. 75 ( 2019-03), p. 11-18
    Type of Medium: Online Resource
    ISSN: 0075-9511
    URL: Article
    DOI: 10.1016/j.limno.2019.01.001
    RVK:
    WA 15000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2019
    detail.hit.zdb_id: 3380-7
    detail.hit.zdb_id: 2187207-7
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    Chemical Lake Restoration Products: Sediment Stability and Phosphorus Dynamics
    American Chemical Society (ACS) ; 2010
    In:  Environmental Science & Technology Vol. 44, No. 3 ( 2010-02-01), p. 985-991
    Details
    In: Environmental Science & Technology, American Chemical Society (ACS), Vol. 44, No. 3 ( 2010-02-01), p. 985-991
    Type of Medium: Online Resource
    ISSN: 0013-936X , 1520-5851
    URL: Article
    DOI: 10.1021/es903260y
    RVK:
    AR 10100
    Language: English
    Publisher: American Chemical Society (ACS)
    Publication Date: 2010
    detail.hit.zdb_id: 280653-8
    detail.hit.zdb_id: 1465132-4
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  • 8
    Online Resource
    Online Resource
    Reduction of Internal Phosphorus Load in New Lakes by Pretreatment of the Former Agricultural Soil—Methods, Ecological Results and Costs
    MDPI AG ; 2020
    In:  Sustainability Vol. 12, No. 9 ( 2020-04-28), p. 3575-
    Details
    In: Sustainability, MDPI AG, Vol. 12, No. 9 ( 2020-04-28), p. 3575-
    Abstract: New lakes are established or reestablished to provide ecosystem services such as limiting floods and nutrient discharge and to improve biodiversity. New lakes are often established on fertilized land formerly used for agricultural purposes, thereby posing a risk of issues such as phosphorus (P) release when inundated. Release of P from agricultural soil affects both the developing ecosystem of the new lake and may increase downstream eutrophication. To decrease P release following inundation, three simple and cost-effective soil pretreatments were tested through laboratory soil–water fluxes from the test sites in the new Lake Roennebaek and the fluxes of P, nitrogen (N), and iron (Fe) were compared. The pretreatments compared were sand-capping, depth-plowing, and addition of the commercial iron product CFH-12® (Kemira). Untreated agricultural soil incubated under laboratory conditions released 687 ± 88 mg P·m−2 over 207 days and 85% was released within 60 days from inundation followed by low soil–water P exchange during the remaining incubation period. However, P was still released from the untreated soil 180 days after inundation within the lake. The cumulated P flux of the three pretreatment methods was in comparison negative, between −12 ± 3 and −17 ± 4 mg P·m−2 over 207 days incubation and showed negative P fluxes from cores collected within the lake 180 days after inundation. This study showed that the release of P when establishing new lakes on former agricultural land could be minimized using these simple and cost-effective methods, which may improve the ecological status of future lakes and enable the establishment of new lakes without threatening vulnerable downstream ecosystems.
    Type of Medium: Online Resource
    ISSN: 2071-1050
    URL: Article
    DOI: 10.3390/su12093575
    Language: English
    Publisher: MDPI AG
    Publication Date: 2020
    detail.hit.zdb_id: 2518383-7
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  • 9
    Online Resource
    Online Resource
    Changed cycling of P, N, Si, and DOC in Danish Lake Nordborg after aluminum treatment
    Canadian Science Publishing ; 2011
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 68, No. 5 ( 2011-05), p. 842-856
    Details
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 68, No. 5 ( 2011-05), p. 842-856
    Abstract: Loading, retention, and in-lake cycling of phosphorus (P), nitrogen, silica, and dissolved organic carbon (DOC) were studied 1 year before and 3 years after P-inactivation by aluminum (Al) hydroxide in Danish Lake Nordborg in 2006. Simultaneously, external P loading was reduced by 40% via establishment of precipitation ponds in two inlets. After Al treatment, the internal P loading (sediment P release) during summer declined 90%–94%, owing to adsorption to aluminum hydroxide. Also, silicate regeneration from the sediment was reduced by 69%–76%, and sediment oxygen uptake as well as ammonium release declined markedly. Consequently, lake water total P, dissolved inorganic P, silicate, and DOC decreased by 73%, 97%, 87%, and 46%, respectively. The Secchi depth increased in the summer period during the first post-treatment year, but declined afterwards to pre-treatment levels, even though the mean lake-water total P concentration during summer was reduced from ∼240 µg·L –1 before treatment to 26–65 µg·L –1 in the first three post-treatment years. We conclude that a further reduction in external P loading is needed to obtain the full effect of the Al treatment in Lake Nordborg.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    URL: Article
    DOI: 10.1139/f2011-016
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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  • 10
    Online Resource
    Online Resource
    Group hunting in harbour porpoises ( Phocoena phocoena )
    Canadian Science Publishing ; 2021
    In:  Canadian Journal of Zoology Vol. 99, No. 6 ( 2021-06), p. 511-520
    Details
    In: Canadian Journal of Zoology, Canadian Science Publishing, Vol. 99, No. 6 ( 2021-06), p. 511-520
    Abstract: Cooperative hunting involves individual predators relating in time and space to each other’s actions to more efficiently track down and catch prey. The evolution of advanced cognitive abilities and sociality in animals are strongly associated with cooperative hunting abilities as has been shown in lions, chimpanzees, and dolphins. Much less is known about cooperative hunting in seemingly unsocial animals, such as the harbour porpoise (Phocoena phocoena (Linnaeus, 1758)). Using drones, we were able to record 159 hunting sequences of porpoises, out of which 95 sequences involved more than one porpoise. To better understand if the harbour porpoises were individually attracted by the fish school or formed an organized hunting strategy, the behaviour of each individual porpoise in relation to the targeted fish school was analysed. The results indicate role specialization, which is considered the most sophisticated form of collaborative hunting and only rarely seen in animals. Our study challenges previous knowledge about harbour porpoises and opens up for the possibility of other seemingly non-social species employing sophisticated collaborative hunting methods.
    Type of Medium: Online Resource
    ISSN: 0008-4301 , 1480-3283
    URL: Article
    DOI: 10.1139/cjz-2020-0289
    RVK:
    WA 15000
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1490831-1
    SSG: 12
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