The Modeling of Sustainable Cockle-Fishery in the Wadden Sea, The Netherlands

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Identification_Information:
Citation:
Citation_Information:
Originator: Yomba S.W., Restrepo J.A., Sharaff F. F., Najem alden, M.
Publication_Date: Unknown
Title: The Modeling of Sustainable Cockle-Fishery in the Wadden Sea, The Netherlands
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Description:
Abstract:
Sustainability in cockle-fishery activities in the Wadden Sea is presently a debate among fishery firms, government and conservationists in The Netherlands. Before 80's the mechanized fishing with dredging exploitation of cockles originally existed in relative harmony with nature conservation in the area. This ended when the over-fishing continued during the series of mild winters in 1988,1989 and 1990 that resulted into three consecutive years without spatfall of cockles (Wolff, 2001). As a result, a dramatic decrease of cockle stock caused unsteady conditions between fishery and natural conservation. Since, mechanized over fishing for cockles may harm nature into two main ways: It may cause food shortages to birds feeding on large shellfish stock and damage important habitats like cocklebeds (Scheiffarth, et al 2001). As an outcome, the high mortality of shorebirds was reported because the species feeds on the sizes of cockles that are also preferred by cockle-fisheries (Ens et al., 2003; Verhulst et al, 2004; Kamermans, 2002). Then, the policy decision was made to ensure survival of birds to satisfy at least 60% of their needs at minimum size of cockle stock (Wolff, 2001) . On the other hand, there are studies in the Dutch Wadden Sea that show the negative long-term impacts on spatfall of cockles because of changes in the sediment characteristics from fine silt to coarse grains done by suction dredging used for cockle fishery purposes (Dare, et al 2004; Piersma, 2001). The main request of the Fisheries was that the model should represent the profit, government, and conservationist interests. In aim of this goal the group applied the Environmental System Analysis (ESA) based on scientific published data in order to develop a model, which would run several scenarios to figure out the requirements of the stakeholders in the area. OBJECTIVES OF THE MODEL 1. Seek the optimum number of boats for cockles dredging which will not disturb the cockle stock and the feeding needs of cockle-catching bird population. 2. Run the predator-prey model to find out the relationship between cockles and seabirds population. 3. Test the feedback between cockles recovery and silt content in the sediment. Modelling is available per request.
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Arturo Restrepo et. al. 2005 . The Modeling of Sustainable Cockle-Fishery in the Wadden Sea. Environmental System Analysis. UNESCO-IHE Delft, The Netherlands.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 2.0
East_Bounding_Coordinate: 4.0
North_Bounding_Coordinate: 58.0
South_Bounding_Coordinate: 57.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > AGRICULTURE > AGRICULTURAL AQUATIC SCIENCES > AQUACULTURE
Theme_Keyword: EARTH SCIENCE > OCEANS > MARINE SEDIMENTS
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > POPULATION DYNAMICS
Theme_Keyword: EARTH SCIENCE > HUMAN DIMENSIONS > ECONOMIC RESOURCES > AQUACULTURE PRODUCTION
Theme_Keyword: EARTH SCIENCE > HUMAN DIMENSIONS > SUSTAINABILITY
Theme_Keyword: Marine Ecology
Theme_Keyword: BIOTA
Theme_Keyword: OCEANS
Theme_Keyword: SOCIETY
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > EUROPE > WESTERN EUROPE > NETHERLANDS
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: TYLER B. STEVENS
Contact_Position: INVESTIGATOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA Goddard Space Flight Center
Address: Global Change Master Directory
City: Greenbelt
State_or_Province: MD
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: (301) 614-6898
Contact_Facsimile_Telephone: 301-614-5268
Contact_Electronic_Mail_Address: Tyler.B.Stevens@nasa.gov
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UNESCO/IHE > Institute for Water Education, United Nations Educational, Scientific and Cultural Organization
Contact_Person: TYLER B. STEVENS
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA Goddard Space Flight Center
Address: Global Change Master Directory
City: Greenbelt
State_or_Province: MD
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: (301) 614-6898
Contact_Facsimile_Telephone: 301-614-5268
Contact_Electronic_Mail_Address: Tyler.B.Stevens@nasa.gov
Resource_Description: COCKLE_NL
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://www.unesco-ihe.org
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20061228
Metadata_Review_Date: 20130211
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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