Name: Simulated advection patterns of Engraulis encrasicolus and Sardinops sagax larvae across South Africa's inshore Marine Protected Areas
License: https://creativecommons.org/licenses/by-sa/4.0/

DOI: 10.15493/DEA.MIMS.15712023

Title	Simulated advection patterns of Engraulis encrasicolus and Sardinops sagax larvae across South Africa's inshore Marine Protected Areas
Authors	Rasehlomi, Tshikana Department of Forestry, Fisheries and the Environment; role: Researcher
Publisher	Department of Forestry, Fisheries and the Environment (2025)
Contributors	Project Member: Krug, Marjolaine Department of Forestry, Fisheries and the Environment; role: National Oceans and Coastal Information Management System (OCIMS) Director Project Member: Myksvoll, Mari S. Environmental Impacts of Aquaculture, Institute of Marine Research; role: Programme Director Contact Person: Rasehlomi, Tshikana Department of Forestry, Fisheries and the Environment; role: Researcher email: trasehlomi@dffe.gov.za
Abstract	Larval anchovy and sardine dispersal patterns in South Africa's exclusive economic zone (2010 - 2014) by Rasehlomi et al. (2025), published in Frontiers in Marine Science, investigates the dispersal of larval anchovy and sardine (https://doi.org/10.3389/fmars.2024.1508479). We simulated larval dispersal patterns using a simplified model within the Java-based ICHTHYOP particle tracking tool. This model compared outputs from the 3km grid resolution CROCO model and the 8km-resolution Global Ocean Reanalyses (GLORYS). Virtual particles were released from the surface of 14 inshore Marine Protected Areas (MPAs), from iSimangaliso MPA (on the east coast) including the Agulhas Bank (on the south) to Childs Bank MPA (on the west coast). Releases occurred on October 1st for five consecutive years, starting in 2010. These particles drifted for 30 days, with their positions recorded every 30 minutes. Particles that exited the model's boundaries or became stranded on beaches were excluded from the analysis, as they were no longer considered viable.
Methods	The objectives of the experiments were to 1) establish the dispersal patterns of larval anchovies and sardines spawned within South Africa's coastal Marine Protected Areas (inshore of the 200m isobath) during the 2010-2014 period, and 2) assess the impact of model resolution on these dispersal patterns. We compared outputs from a 3-km-grid Coastal and Regional Ocean Community model (CROCO) with an 8-km-grid global ocean physics reanalysis product (GLORYS). Particle advection simulations were run in Ichthyop (Lett et al, 2008) every 1st day of October for 5 years, and were allowed to drift for 30 days while being tracked every 1800 seconds.
Data	Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) Cite 10.15493/DEA.MIMS.15712023 Style Terms of use These data are made available with the express understanding that any such use will properly acknowledge the originator(s) and publisher and cite the accession numbers and/or associated Digital Object Identifiers. Anyone wishing to use these data should properly cite and attribute the data providers listed as authors in the metadata provided with each dataset. It is expected that all the conditions of the data license will be strictly honoured. Use of any material herein should be properly cited using the dataset’s persistent identifiers such as accession numbers and DOIs. I agree to the terms of use
Temporal extent	01 Oct 2010 – 31 Oct 2014
Geographic extent	500 km Leaflet Tiles © Esri — Source: Esri, DeLorme, NAVTEQ, USGS, Intermap, iPC, NRCAN, Esri Japan, METI, Esri China (Hong Kong), Esri (Thailand), TomTom, 2012 South Africa North: -28.0 South: -42.0 West: 15.0 East: 34.0
Keywords	Anchovy, Connectivity, Dispersion, INDIAN OCEAN, Lagrangian Analysis, Marine Protected Area, MPA, Sardine, SOUTH ATLANTIC OCEAN
Related resources	This digital object is referenced by 10.3389/fmars.2024.1508479

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