CICIMAR Oceánides

Morphological and molecular analyses of Coolia malayensis (Dinophyceae) and effects of extracts of the macroalga Dictyota dichotoma (Phaeophyceae) on its growth

Ana Emilia Ramos Santiago — Wed, 15 Mar 2023 00:00:00 +0000

Coolia is a genus that at present includes eight species of epibenthic dinoflagellates of interest due
to the toxins produced (e.g., cooliatoxin) by species of the genus and their associations with other toxic epibenthic
dinoflagellates genera (Ostreopsis, Amphidinium, Prorocentrum and Gambierdiscus). There is limited information
on the diversity and ecology of this genus along the coasts of Mexico. The objectives of this study were to identify
by the use of integrative taxonomy (morphological and molecular) two isolates of Coolia (CMBAPAZ-1 and s/i 72)
from Bahía de la Paz, Gulf of California and to determine the effects of the extracts from the macroalga Dictyota dichotoma on their growth. Both isolates were cultured in GSe medium with and without macroalgal extracts: 1) GSe
medium, 2) GSe with the addition of the crude extract of D. dichotoma, 3) GSe with the addition of the carbohydrate
fraction of D. dichotoma, and 4) GSe with the addition of the non-precipitable fraction of D. dichotoma. Morphological and molecular analyses of the 28S region of rDNA (bootstrap values > 95%) confirmed the identification
of the isolates as Coolia malayensis. There were no significant differences (p < 0.05) in the cell abundances of two
strains in GSe medium compared with the other treatments. The maximum abundances found in strains CMBAPAZ-1 and s/i 72 at 28 days of culture were 40,271 ± 3,018 and 43,428 ± 4,560 cells mL-1, respectively. The growth
rate ranged from 0.129 to 0.139 div day-1 in both strains. The extract and fractions of D. dichotoma neither favored
nor inhibited the growth of C. malayensis; therefore, the possibility that the macroalga may favor the growth of this
dinoflagellate in its natural environment is not excluded

SYSTEMATIC LIST UPDATE OF THE CLASS GASTROPODA IN THE CENTRAL AND NORTHERN COAST OF SONORA, GULF OF CALIFORNIA

Adrian Arvizu -Ramirez, Hector Reyes -Bonilla, Angelica Paulina Riesgo -Ruiz — Wed, 15 Mar 2023 00:00:00 +0000

Diversity studies and research have included members of the class Gastropoda from the Gulf of
California. Still, the majority have been researched in a rudimentary or secondary way, with literature not specific
to the region causing discrepancies in the nomenclature of the taxa. This could affect the information on some taxa.
It could also affect the malacological knowledge of the region. Therefore, an updated fauna inventory was built for
71 families of the class Gastropoda on the coast of Sonora based on latitudinally-referenced information of 3261
records of species names from the region (27° N – 31° N), obtained from official electronic databases and physical
revision of malacological material from a museum. Depuration and taxonomic updates were performed when the
obtained information was compared with the World Register of Marine Species platform. As a result, 26.64% of
the species’ names showed status updates, resulting in 713 valid names of gastropods. The latitudinal distribution
highlighted 27° N and 31° N with the greatest data and species diversity. The easy access to port cities (in the
previously mentioned latitudes) makes them suitable points for scientific research since they have demonstrated a
strong bias compared to intermediate latitudes.

PUBLICATION ANOMALIES AND “PAYWALL” WOES IN ACADEMIA

Prasanta Panda — Wed, 15 Mar 2023 00:00:00 +0000

. It is a boon to enhance the base in any encyclopaedias by adding new found knowledge for newer
superstructures that can lead to civilizational growth. However, the newly found knowledge should be profound
enough to be considered as the base. Otherwise, the superstructure of knowledge will not be of any use to meet the
requirement of civilizational growth. This essay is investigative to see through the anomalies the worldwide publi- cation web has at the present moment of history and the far-reaching negative impact it may ensure if the presentday academia is not responding to the suggestions made by the researchers in this context