Remotely Sensing the Biophysical Drivers of Sardinella aurita Variability in Ivorian Waters

The coastal regions of the Gulf of Guinea constitute one of the major marine ecosystems, producing essential living marine resources for the populations of Western Africa. In this region, the Ivorian continental shelf is under pressure from various anthropogenic sources, which have put the regional fish stocks, especially Sardinella aurita, the dominant pelagic species in Ivorian industrial fishery landings, under threat from overfishing. Here, we combine in situ observations of Sardinella aurita catch, temperature, and nutrient profiles, with remote-sensing ocean-color observations, and reanalysis data of wind and sea surface temperature, to investigate relationships between Sardinella aurita catch and oceanic primary producers (including biomass and phenology of phytoplankton), and between Sardinella aurita catch and environmental conditions (including upwelling index, and turbulent mixing). We show that variations in Sardinella aurita catch in the following year may be predicted, with a confidence of 78%, based on a bilinear model using only physical variables, and with a confidence of 40% when using only biological variables. However, the physics-based model alone is not sufficient to explain the mechanism driving the year-to-year variations in Sardinella aurita catch. Based on the analysis of the relationships between biological variables, we demonstrate that in the Ivorian continental shelf, during the study period 1998–2014, population dynamics of Sardinella aurita, and oceanic primary producers, may be controlled, mainly by top-down trophic interactions. Finally, based on the predictive models constructed here, we discuss how they can provide powerful tools to support evaluation and monitoring of fishing activity, which may help towards the development of a Fisheries Information and Management System

1-Acryloyl-2,6-bis­(4-chloro­phen­yl)-3,5-dimethyl­piperidin-4-one

In the crystal structure of the title compound, C22H21Cl2NO2, the piperidinone ring is in a boat conformation

1-Chloro­acetyl-3-isopropyl-r-2,c-6-diphenyl­piperidin-4-one

In the title compound, C22H24ClNO2, the piperidine ring adopts a distorted boat conformation. The dihedral angle between the two phenyl rings is 83.2 (1)°. In the crystal, the mol­ecules are linked into chains running along the b axis by C—H⋯O hydrogen bonds. The Cl atom of the chloro­acetyl group is disordered over two positions with occupancies of 0.66 (2) and 0.34 (2)

Cartographie De La Dynamique Du Trait De Cote A Grand-Lahou : Utilisation De L’outil « Digital Shoreline Analysis System (Dsas)»

Like many coasts, coastal erosion is evident on all the Ivorian coast and is characterized by the destruction of physical assets (infrastructure, habitat and sightseeing). Especially in Grand-Lahou, it threatens a fishing village located on a strip of land 200 meters separating the Atlantic Ocean from the Tadjo lagoon and facing the mouth of the Bandama River. To contribute to the choice of sustainable coastal development in Grand-Lahou, this study aims to characterize the dynamics of the coastline by performing coastal erosion map locally for the best appreciation of the erosion phenomenon. To do this, the GIS which consisted of compilation of coastlines data from Landsat images from 1998, 2001, 2005, 2009, 2011 and 2014 in the study area. The dynamic of the coastline in this zone was done through the Digital Shoreline Analysis System (DSAW). The variations observed between 1998 and 2014 show a coastline fattening at an average rate of 2.09 m / year in the west of the river mouth before Lahou-Kpanda village and erosion with a speed of 0.84 m / year on rest of the shore after Lahou Kpanda village

Biochemical mutagens affect the preservation of fungi and biodiversity estimations

Many fungi have significant industrial applications or biosafety concerns and maintaining the original characteristics is essential. The preserved fungi have to represent the situation in nature for posterity, biodiversity estimations, and taxonomic research. However, spontaneous fungal mutations and secondary metabolites affecting producing fungi are well known. There is increasing interest in the preservation of microbes in Biological Resource Centers (BRC) to ensure that the organisms remain viable and stable genetically. It would be anathema if they contacted mutagens routinely. However, for the purpose of this discussion, there are three potential sources of biochemical mutagens when obtaining individual fungi from the environment: (a) mixtures of microorganisms are plated routinely onto growth media containing mutagenic antibiotics to control overgrowth by contaminants, (b) the microbial mixtures may contain microorganisms capable of producing mutagenic secondary metabolites, and (c) target fungi for isolation may produce “self” mutagens in pure culture. The probability that these compounds could interact with fungi undermines confidence in the preservation process and the potential effects of these biochemical mutagens are considered for the first time on strains held in BRC in this review

Spatio-Temporal Study of Phytoplankton Groups from Inherent Optical Properties (Iops) in The Ivorian Marine Coastline from 2010 To 2020

Today global warming affects all environments including coastal marine environments. Climate change also affects the development and proliferation of phytoplankton groups often leading to the massive production of phytoplankton groups in marine waters. It is with this in mind that the study on the determination of phytoplankton groups from optical properties in Ivorian marine waters was initiated. This study showed a great diversity of phytoplankton in the Ivorian marine domain during the years 2010 and 2020. The data used in these studies are geospatial data (remote sensing) of the optical properties of the oceans, in particular the IOPs (inherent optical properties). These are the fusion data from the various SeaWiFS, MODIS, MERIS, VIIRS sensors from 2010 to 2020 from the various OrbView 2, NOAA, ENVISAT and AQUA satellites, in particular the absorption coefficient data for dissolved and detrital matter at 443 nm (adg ), phytoplankton absorption coefficient data at 443 nm (aph), and dissolved and detrital particulate backscatter coefficient data at 443 nm (bbp).For the processing of these data the pixel-oriented classification method was used for the identification of phytoplankton groups. The SeaDAS v 7.4 software, allowed to process and analyze the data and the Envi 5.3 software allowed to perform the data classification. The values ​​of inherent optical properties (IOPs) were obtained as well as the spatial distribution of phytoplankton groups, thus allowing the production of maps of IOPs and the production of spatio-temporal distribution maps of cyanobacteria and diatom

1-Dichloroacetyl-r-2,c-6-bis(4-methoxyphenyl)-t-3,t-5-dimethylpiperidin-4-one

In the title compound, C23H25Cl2NO4, the piperidine ring adopts a distorted boat conformation. The dihedral angle between the benzene rings is 54.8 (1)°. In the crystal, the molecules are linked into a two-dimensional network parallel to the ab plane by C—H...O hydrogen bonds