Figure 2: The relational structure of the Portuguese Historical Fish Database. | Scientific Data

Figure 2: The relational structure of the Portuguese Historical Fish Database.

From: One millennium of historical freshwater fish occurrence data for Portuguese rivers and streams

Figure 2

Each box represents one table, with the header of a box indicating the name of the table, followed by the list of fields included in the table. The red lines indicate the primary relationship between tables; red fields are the primary key of each table; fields in blue indicate secondary relationships between tables.

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