2019. Hidden diversity under morphology-based identifications of widespread invasive species: the case of the 'well-known' hydromedusa Craspedacusta sowerbii Lankester 1880. Animal Biodiversity and Conservation, Doi: https://doi.
AbstractHidden diversity under morphology-based identifications of widespread invasive species: the case of the 'wellknown' hydromedusa Craspedacusta sowerbii Lankester 1880. A relatively scarce number of morphological features available for delimiting closely related species and an increasingly worrisome scenario on Global Climate Change causing the rapid dispersion of invasive alien species can lead to the rapid spread of reports of a given species around the world. Craspedacusta sowerbii Lankester, 1880 is considered the most widespread freshwater jellyfish species and has been reported in numerous locations on all continents except Antarctica. Recently, a few medusae attributed to C. sowerbii were collected from a water reservoir (Bin El Ouidan) in Morocco, this being the first confirmed record of the species from North Africa. The morphology of these newly collected specimens agrees well with previous descriptions, but mitochondrial (Cox1 and 16S) and nuclear ITS (ITS1-5,8S-ITS2) molecular data lead to a discussion of a more complex general view concerning the number of species, synonyms and nomenclatural problems hidden behind the reports of Craspedacusta sowerbii.
ResumenLa diversidad oculta en las identificaciones basadas en la morfología de especies invasoras de amplia distribución: el caso de la "bien conocida" hidromedusa Craspedacusta sowerbii Lankester 1880. El número relativamente escaso de características morfológicas utilizadas para delimitar especies estrechamente relacionadas y el panorama cada vez más preocupante en el que el cambio climático global provoca la rápida dispersión de especies exóticas invasoras pueden conducir a la difusión precipitada por todo el mundo de informes sobre una especie determinada. Craspedacusta sowerbii Lankester, 1880, que se considera la especie de medusa de agua dulce más extendida, ha sido observada en numerosos lugares en todos los continentes, excepto en la Antártida. Recientemente, se recogieron algunas medusas atribuidas a C. sowerbii en un embalse artificial (Bin El Ouidan) en Marruecos, que representaron el primer registro confirmado de la especie en el norte de África. La morfología de estos especímenes recién recolectados concuerda con las descripciones anteriores, pero los datos moleculares mitocondriales (Cox1 y 16S) y nucleares ITS (ITS1-5,8S-ITS2) suscitan un debate general más complejo con respecto al número de especies, las sinonimias y los problemas nomenclaturales ocultos tras los informes de Craspedacusta sowerbii.Hidden diversity under morphology-based identifications of widespread invasive species: the case of the 'well-known' hydromedusa Craspedacusta sowerbii Lankester 1880
Biosorption using
natural waste has emerged
as a potential and promising strategy for removal of toxic dyes from
wastewaters in comparison to conventional ones. Herein, the
Codium decorticatum
alga (CDA) was biologically identified
and used as a biosorbent for anionic and cationic dyes from aqueous
solutions. SEM analysis showed a rough surface with an irregular edge
and shape while hydroxyl, amine, sulfur and carboxyl functional groups
were identified using FTIR analysis. TGA/DTG confirmed the stability
of CDA and the adsorption process. Batch studies were conducted to
investigate the effect of operational factors such as initial pH,
biosorbent dosage, temperature, initial concentration, and solid/liquid
contact time on the biosorption of crystal violet (CV) and Congo red
(CR) dyes. For both CV and CR dyes, the biosorption kinetics was accurately
described by the pseudo-second-order model and the Langmuir isotherm
was found to be best fitted for equilibrium data. Maximum uptake capacities
have attained up to 278.46 mg/g for CV and 191.01 mg/g for CR. The
CV and CR dye biosorption mechanism was ultimately manifested through
the electrostatic interactions. The regeneration study showed that
the CDA presents excellent reuse performance up to four consecutive
cycles. The process optimization was performed using the response
surface methodology based on Box–Behnken design (RSM-BDD).
Accordingly, the optimum predicted removal efficiencies using RSM-BBD
for CV and CR were obtained, respectively, at 96.9 and 89.8% using
a CDA dose of 1.5 g/L, dye concentration of 20 mg/L, pH of 10 for
CV, and pH of 4 for CR. Overall, CDA behaves as an efficient, recyclable,
cheap, and eco-friendly adsorbent for cleaning-up of dyed effluents.
The region of Agadir has experience considerable development for a few years with numerous anchor projects for the various sectors (fishing, tourism, industry, agriculture etc.). Large parts of these development projects are located on the coast. As an example, a new large sea resort called Taghazout Bay (615 ha) is located on the shoreline of Taghazout, about fifteen kilometers from the Agadir city. This tourist project may provoke disturbances on the faunal and floral organizations, as well as on the physico-chemical quality of the seawater and the sediment. Besides the recent study on the microbiological quality of the Taghazout seawater (Lamine et al., 2019) and the study of Donax trunculus dynamics (Lamine et al., 2020), to our knowledge, no ecological study was realized at the coasts of Taghazout. In fact, the studies on the sandy beaches at the regional and national level are still rare. Otherwise, one
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.