northseaZoo: North Sea zooplankton dataset

In ecotraj: Ecological Trajectory Analysis

North Sea zooplankton dataset

Description

A multi-annual (1958-2021), monthly resolved dataset of zooplankton community composition in the Northern and Southern North Sea used to illustrate Cyclical Ecological Trajectory Analysis (CETA)

Format

northseaZoo is an object of class list composed of 3 objects:

Hellinger

a data.frame containing Hellinger-transformed zooplankton taxa abundances.

times

a vector indicating the date (in year) associated to each line in Hellinger.

sites

a vector indicating the site ("NNS" = Northern North Sea, "SNS" = Southern North Sea) associated to each line in Hellinger.

Details

The data describes the zooplankton community in the North Sea sampled by the Continuous Plankton Recorder (CPR) survey. The CPR survey operates through towing of CPR samplers across commercial routes of merchant ships (plankton silk mesh = 270 microm, sampling depth = 5-10 m). When brought back to the laboratory, plankton is counted and identified taxonomically following standardized protocols. The raw data provided by the survey (\Sexpr[results=rd]{tools:::Rd_expr_doi("10.17031/66f12be296d70")}). was reformated into two monthly-resolved time series of the commonest zooplankton taxa in the Northern North Sea ("NNS") and the Southern North Sea ("SNS"). During data processing, a smoothing was performed by taking a rolling average (for each month, 5 values were averaged: a 3 months window + the corresponding month of the previous and next years). The abundances were finally Hellinger-transformed, making them amenable to ecological diversity study.

Author(s)

Nicolas Djeghri, Université de Bretagne Occidentale, France

Pierre Hélaouët and CPR survey staff, Marine Biological Association, United Kingdom

See Also

trajectoryCyclical

ecotraj documentation built on June 8, 2025, 11:24 a.m.