Measuring species concentration, diversification and dependency in a macro-fishery

Ikerne Valle (), Kepa Astorkiza and Ignacio Díaz-Emparanza
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Ikerne Valle: University of the Basque Country
Kepa Astorkiza: University of the Basque Country

Empirical Economics, 2017, vol. 52, issue 4, No 23, 1689-1713

Abstract: Abstract This paper studies the triad “concentration, diversification and dominance” in an ecosystem $$(\Omega _{t})$$ ( Ω t ) defined as the macro-fishery comprised by the entire commercial fish species landed in a specific geographical area and time horizon (1986:1–2011:12). This is faced computing alternative monthly concentration indices (CIs) based on the income shares of individual species and, afterwards, analysing the structural features and overall dynamics of the monthly time series related to each of the CIs. Special attention will be paid on categorising not only the long-term cycles, but also the seasonal components found in the series.

Keywords: Macro-fishery; Concentration index; Time series; Deterministic–stochastic trend; Deterministic–stochastic seasonality; Seasonal unit roots (search for similar items in EconPapers)
JEL-codes: C22 Q22 (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1007/s00181-016-1102-8

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