| Titre | Historical environmental measurements reveal drastic decrease on Baltic Sea keystone species |
| Télécharger | Téléchargement (publication entière) |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Sahla, M; Kurvinen, L; Ruuskanen, A |
| Source | Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; par Todd, B J ; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Commission géologique du Canada, Dossier public 8295, 2017 p. 103, https://doi.org/10.4095/305922  Accès ouvert |
| Liens | GeoHab 2017
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| Année | 2017 |
| Éditeur | Ressources naturelles Canada |
| Réunion | 2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; mai 1-4, 2017 |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/305922 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Program and
abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada |
| Formats | pdf |
| Région | Baltic Sea |
| Lat/Long OENS | 10.0000 30.5000 66.0000 53.7500 |
| Sujets | techniques de cartographie; océanographie; milieux marins; études côtières; conservation; organismes marins; écologie marine; gestion des ressources; peuplements biologiques; etudes de l'environnement;
écosystèmes; biotopes; benthos; algues; sediments en suspension; débit de sedimentation; établissement de modèles; qualité de l'eau; salinité; turbidite; changements du niveau de la mer; Biologie; Méthodologie; Plante; géologie marine; géologie des
dépôts meubles/géomorphologie; géologie de l'environnement; Nature et environnement |
| Illustrations | croquis cartographiques |
| Programme | Géoscience en mer |
| Diffusé | 2017 09 26 |
| Résumé | (disponible en anglais seulement)
Human activities have been drastically reshaping the distribution of Baltic marine biotopes during the past 100 years. The Baltic Sea is especially vulnerable
to human pressures due to its limited water exchange. A large variety of human activities occur in the marine areas. However some of the most notable pressures, such as eutrophication and increased sedimentation, can be traced to activities happening
in the surrounding drainage areas. Eutrophication increases the amount of algal material in the water column, which together with suspended sediments can reduce the light penetration significantly. Light availability is crucial for benthic plants and
therefor declining light penetration will result in deep areas becoming unsuitable for plant growth.
In this study we have combined new habitat modeling techniques and historical water quality data to show how changes in light availability have
affected to the extent of favorable areas for bladderwrack (Fucus spp.), which is one of the most important keystone species in the northern Baltic Sea. This study is as far as we know the first attempt to quantify large scale change of favorable
areas for bladderwrack using spatial analysis. We have found that decreased light availability at the seafloor has reduced suitable areas for Fucus spp. in Finnish coastal waters up to 60% during past 100 years. Similar trend has been found when
examining long term surveillance data on maximum depth limits on Fucus spp. occurrence during the past decades.
We have been able to successfully map areas where large scale habitat degradation has been taking place. The results are being used in
the assessment of Finnish Red List of Ecosystems and the methodology is applied for other biotopes as well. The resulting data can also be used when making conservation and restoration plans for marine areas. The importance of these findings lies in
future planning. We know now what kind of status can again be achieved if sufficient protection measures are taken into action. We can also use this methodology to project future scenarios for habitat distribution with changes in salinity, nutrients,
turbidity or even sea level rise. |
| Sommaire | (Résumé en langage clair et simple, non publié)
La seizième conférence annuelle GeoHab s'est déroulée cette année (2017) au campus Waterfront du Nova Scotia Community College à Dartmouth, en
Nouvelle-Écosse, au Canada. |
| GEOSCAN ID | 305922 |
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