421e7dc1-8d92-4b80-ad14-2efc48760f7e English HELCOM Secretariat data@helcom.fi 2023-04-14T14:10:48 EPSG:3035 Population trend and abundance of seals - results summary HOLAS 3 2023-03-17 https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/421e7dc1-8d92-4b80-ad14-2efc48760f7e This core indicator evaluates the status of the marine environment based on population trends and abundance of the three species of seals that occur in the Baltic Sea. Good status is achieved for each species when the abundance of seals in each management unit is at least 10,000 individuals and the species-specific growth rate is achieved. Harbour seals in the southwestern Baltic and the Kattegat form a metapopulation, where subpopulations are genetically connected. The combined sizes of the subpopulations are here used to evaluate the Limit Reference level (LRL). The status evaluation is presented separately for the three seal species. The grey seal in the Baltic proper is evaluated as a single unit, whereas the Kattegat grey seals are evaluated separately. The status of ringed seals is evaluated for two management units. The status of harbour seals is evaluated for three management units. Grey seal dataset displays the result of the indicator in HELCOM Assessment Scale 1 (whole Baltic Sea) so that Baltic proper is evaluated as a single unit, whereas the Kattegat grey seals are evaluated separately. Attribute information: "level_1" = Name of assessment unit for the evaluation "AULEVEL" = Assessment unit level used for the indicator "Status" = Status of the indicator (“Achieve”, “Fail” or “Not assessed”) "Unit of indicator" = Unit of indicator (Abundance - Grey seal / % decrease) "Threshold" = Threshold value "Area (km2)" = Area of HELCOM assessment unit "Indicator" = Indicator value "ConfA" = Confidence of classification "ConfT" = Temporal confidence of classification "ConfS" = Spatial confidence of classification "ConfM" = Methodological confidence of classification "Notes" = Additional information HELCOM Secretariat data@helcom.fi Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme ecological abundance marine mammal population trend GEMET 2018-08-16 geonetwork.thesaurus.external.theme.gemet-en MADS HOLAS3 Core indicator Use constraints: Data can be used freely given that the source is cited (following creative commons license CC-BY). The source should be cited as: “HELCOM HOLAS 3 Dataset (2023)" Access constraints: No limitations on public access. English environment 7.5265 33.7966 52.5359 66.4241 2016-01-01 2021-12-31 ESRI Shapefile 1.0 https://maps.helcom.fi/website/mapservice/?datasetID=indicators_and_assessments272 WWW:LINK-1.0-http--link View Population trends and abundance of seals - harbour seal summary https://maps.helcom.fi/website/MADS/download/?id=indicators_and_assessments272 WWW:LINK-1.0-http--link Download Population trends and abundance of seals - harbour seal summary https://maps.helcom.fi/website/mapservice/?datasetID=indicators_and_assessments277 WWW:LINK-1.0-http--link View Population trends and abundance of seals - grey seal summary https://maps.helcom.fi/website/MADS/download/?id=indicators_and_assessments277 WWW:LINK-1.0-http--link Download Population trends and abundance of seals - grey seal summary https://maps.helcom.fi/website/mapservice/?datasetID=indicators_and_assessments273 WWW:LINK-1.0-http--link View Population trends and abundance of seals - ringed seal summary https://maps.helcom.fi/website/MADS/download/?id=indicators_and_assessments273 WWW:LINK-1.0-http--link Download Population trends and abundance of seals - ringed seal summary Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 The national survey data is compiled annually by the HELCOM Seal Expert Group. A regional database was developed within BALSAM project and has been hosted by the HELCOM Secretariat since 2015. This database will be further developed to also enable evaluation of the Distribution of Baltic seals indicator. This new database will be harmonized with the OSPAR reporting format as a part of tasks given in the Baltic BOOST WP 1.2 by the end of 2016. The data collected and used in the indicator are based on national aerial surveys. The survey methodology is described in Galatius et al. (2014). This data covers only haul-out sites and not areas used e.g. as hunting grounds. This core indicator evaluates whether good status is achieved by determining the growth rate of the population as well as the population size over a specified time period. The data collected and used in this indicator are based on national aerial surveys described in Galatius et al. (2014). Each assessment unit is evaluated against two threshold value, the threshold value for population growth rate and the Limit Reference Level (LRL). The status of seals in each management unit only achieve good status if both threshold values are met. Time series of data for each seal species and each management unit are used as input values in Bayesian analyses with uninformative priors, where it is evaluated whether observed data support the set threshold value. Additional information: http://www.helcom.fi/baltic-sea-trends/indicators/population-trends-and-abundance-of-seals/ Link to metadata of dataset used for indicator calculation: https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/660bb100-790d-4f0a-bcbe-956c89811bcb