Beatriz Yáñez-Rivera

National Autonomous University of Mexico | UNAM

Several benthic copepods were found in sediment samples taken during a short-term project on the diversity and distribution patterns of macro- and meiofauna in Ohuira Bay (northern Sinaloa state, north-western Mexico). The material turned out to belong to two new species, Scottolana tama sp. nov. and Canuellina pacifica sp. nov., and to Longipedia...

A new diosaccin species, Paramphiascella aestuarii n. sp., was found in sediment samples from a shallow estuary in north-western Mexico. The morphological distinction between the new species and its congeners is discussed. The new species is morphologically close to P. calcarifer (Sewell, 1940) from the Maldivian Archipelago. However, P. calcarifer...

Goodeinae is a subfamily of critically endangered fish native to central Mexico. Populations of Skiffia lermae , a species belonging to this subfamily, have significantly decreased in the past two decades. A previous study showed that S. lermae is sensitive to acute nitrate-nitrogen (NO 3 -N) exposure, leading to noticeable changes in both behavior...

Specimens of a caligid copepod (Siphonostomatoida) were found on the gills of the hairfin lookdown Selene brevoortii (Gill) (Carangidae) from off Mazatlán, Sinaloa (north-western Mexico). This material represents a new species of Caligus, C. selenecolasp. nov., and is assigned to the diaphanus species group. Within this group, only C. kapuhili Lewi...

The gut microbiota is a dynamic ecosystem involved in multiple physiological processes that affect host health. Several factors affect intestinal microbial communities including dietary exposure to xenobiotics, which is highly concerning due to their widespread distribution. Current knowledge of this topic comes from culture-dependent methods, 16S...

Thirty-one nominal species of the benthic harpacticoid family Zosimeidae Seifried, 2003 are known from several coastal systems less than 200 m depth and the deep sea. Several copepods of the family Zosimeidae were found in deep-sea sediment samples from the Gulf of Mexico and the Gulf of California (Mexico). The Mexican material represents new spec...

Se reportan por primera vez para el estado de Sinaloa dos especies de babosas terrestres no nativas, la asignación taxonómica se realizó empleando caracteres morfológicos y un marcador mitocondrial. La distribución y abundancia de Sarasinula plebeia sugiere que esta especie se ha establecido, mientras que Deroceras laeve se encontró como ejemplares...

Nitrate-nitrogen (NO3-N) pollution related to anthropogenic activities is increasing in freshwater ecosystems. Knowledge about NO3-N sensitivity in freshwater wild fish is needed to understand the differential tolerance between species. Goodeinae is a subfamily of 41 endemic fishes that inhabit central Mexico, with 33 species in the IUCN red list a...

Glyphosate [N-(phosphonomethyl)glycine] is one of the most popular herbicides worldwide. Globally, the use of glyphosate is increasing, and its residues have been found in drinking water and food products. The data regarding the possible toxic effects of this herbicide are controversial. Therefore, the aim of this study was to evaluate the effects...

This is the first record of two non-native terrestrial slug species from Sinaloa, Mexico. Deroceras laeve and Sarasinula plebeia were collected between 2019 and 2022 in Concordia and Mazatlan Municipalities (north-western Mexico). The external morphology and anatomic features of the dissected specimens coincide with the descriptions of each species...

Glyphosate levels and the transfer of glyphosate across trophic levels have rarely been studied in zooplankton. The food preferences of zebrafish during the first-feeding stage (which is critical for the survival of organisms), were analyzed because of the requirement for live food. Larval survival begins to be affected when glyphosate intake excee...

The species of Chloeia Savigny in Lamarck, 1818 include some of the most colorful amphinomid annelids in tropical seas. Their pigmentation patterns can be diagnostic but because some pigments may fade after ethanol preservation, they have been disregarded as useful taxonomic characters. In this contribution we revise the tropical American species o...

Glyphosate is the most used herbicide in the world. Unfortunately, contamination of water bodies by this herbicide has been reported. A severe concern has been triggered given its detrimental impact on the environment and wildlife. The American horseshoe crab (Limulus polyphemus) is a benthic arthropod that inhabits the Yucatan Peninsula in Southea...

Acute hepatopancreatic necrosis disease (AHPND) is an emerging shrimp disease caused by pathogenic Vibrio parahaemolyticus (Vp) specific strains hosting the plasmid-related pirABvp toxin gene, but the changes on the water microbiome of have not been studied. Juvenile Penaeus vannamei were inoculated with a moderate virulent strain, M0607, and a hig...

Zebrafish (Danio rerio) is a well-established vertebrate model in ecotoxicology research that responds to a wide range of xenobiotics such as pesticides, drugs, and endocrine-disrupting compounds. The epigenome can interact with the environment and transform internal and/or external signals into phenotypic responses through changes in gene transcri...

A new species of Cletocamptus closely related to C. helobius was found in sediment samples taken from a polluted estuarine system in north-western Mexico. The genus Cletocamptus was relegated to species incertae sedis in 1986, and this finding prompted us to evaluate the current taxonomic position of the genus within the Canthocamptidae. The latter...

Two cell lines derived from the brain and heart of a Pacific white snook specimen ( Centropomus viridis) were developed and evaluated in terms of their responsiveness to glyphosate-induced cytotoxicity. The cells were grown in Leibovitz-15 (L-15) medium supplemented with 10% fetal bovine serum (FBS) and were passaged 36 times. Growth was tested at...

Glyphosate [N-(phosphonomethyl)glycine] is the active ingredient in widely used broad-spectrum herbicides. Even though the toxicity mechanism of this herbicide in vertebrates is poorly understood, evidence suggests that glyphosate is an endocrine disruptor capable of producing morphological anomalies as well as cardiotoxic and neurotoxic effects. W...

Transcriptional response regulators (TRR) are the most abundant signal transducers in prokaryotic systems that mediate intracellular changes in response to environmental signals. They are involved in a wide range of biological processes that allow bacteria to persist in particular habitats. There is strong evidence that the bacterial habitat and th...

Glyphosate, the most commonly used pesticide worldwide, blocks aromatic amino acid biosynthetic pathways and inhibits growth in plants. Although the specific mode of action of glyphosate in animals remains unclear, adverse effects during embryonic development have been reported, including epiboly delays, morphological alterations, and changes in ce...

Background: The islands and islets of Bahía de Chamela, in the Eastern Tropical Pacific, were declared as the first marine sanctuary in Mexico and has been protected since 2002. Their marine biodiversity has been documented in a series of papers in the last decade, but only three species of polychaete worms have been reported. New information: S...

Vibrio parahaemolyticus strains have been identified as the causative agent of acute hepatopancreas necrosis disease (Vp AHPND+) in shrimp. In the present work, a highly virulent (M0904) and less virulent (M0607) strain of Vp AHPND+ were used in experimental infections of Penaeus vannamei. Throughout the experiment, histopathological analyses were...

Artículo Article Contribución de las instituciones nacionales en el conocimiento de la biodiversidad marina del Pacífico mexicano. Síntesis y proyección hacía el futuro RESUMEN Sobre la base de la literatura publicada hasta la fecha y la información contenida en las bases de datos de las colecciones nacionales, se realizó una compilación de las esp...

Context: Fiddler crabs are important to the ecology of estuarine systems around the world, however few studies have incorporated them as bioindicators. Urias estuary represents one of the most urbanized lagoons in the Gulf of California region and received discharges from different sources: shrimp farm, thermoelectric plant, fish processing plants,...

The distribution of three deep-water sternaspids in the Gulf of California, off the west coast of the Baja California Peninsula, and off the southwest coast of Mexico, were studied from 2000 to 2014 during 13 oceanographic cruises at 215 stations (n = 1 per station). Polychaetes were collected from 180 to 2394 m depth with a benthic sled, a modifie...

Ascension and Saint Helena Islands are isolated volcanic islands in the South Atlantic Ocean. Records of annelids from the family Amphinomidae, commonly known as fireworms, are rare. Fireworm species recorded in both localities include Eurythoe complanata and Hermodice carunculata, which are broadly distributed throughout the Atlantic Ocean. Here w...

This study revises the taxonomic status of the formerly monotypic Archinomidae, which is nested within paraphyletic Amphinomidae according to recent phylogenetic work. We focused our taxonomic sampling to evaluate the affinities of Notopygos and genera classified as ‘fusiform’ in body shape, including Archinome and Chloeia. Prior to this study, the...

El Golfo de California es reconocido como uno de los cinco mares más productivos y biológicamente diversos del mundo. Sin embargo, su biota nativa está amenazada por la introducción de especies exóticas invasoras. El propósito de este estudio fue la detección de invertebrados exóticos en marinas, puertos y granjas acuícolas de esa ecorregión. Se re...

AbstractThe species of the genus Notopygos Grube, 1855 are characterized by an ovate body, a prominent caruncle with three lobes, dendritic branchiae, and double dorsal cirri. Twenty-two species belonging to Notopygos have been described, mostly from the Indo-Pacific region. In America, few species are frequently recorded: Notopygos crinita Grube,...

Nine nominal species are known from Antarctica and adjacent waters that have been assigned to the genus Perkinsiana (Polychaeta: Sabellidae). Taxonomic notes for these species are provided. Currently, only six species are considered valid: Perkinsiana antarctica (Kinberg), P. decorata (Rullier), P. borsibrunoi Giangrande and Gambi, P. magalhaensis...

En las ecorregiones del Pacífico mexicano se encuentran siete especies exóticas de poliquetos: Alitta succinea (Leuckart in Frey & Leuckart, 1847), Branchiomma bairdi (McIntosh, 1885), Ficopomatus miamiensis (Treadwell, 1934), Hydroides diramphus (Mørch, 1863), H. elegans (Haswell, 1883), H. sanctaecrucis Krøyer in Mørch, 1863 y Polydora websteri H...

The genus Hermodice Kinberg, 1857 was established with the species Aphrodita carunculata Pallas, 1766, based on the shape and development of the caruncle. Several species were later described within the genus; however, it is currently regarded as monotypical, with H. carunculata as a widespread species. An evaluation of available type and non-type...

The fan worm Branchiomma bairdi has been introduced to the Gulf of California from its original distribution in the Caribbean Sea, and is now a conspicuous component of most benthic communities. Study of reproductive features is essential to understand the dispersion capability of B. bairdi and its invasive potential. Sampling was carried out month...

2 entre los descubrimientos más interesantes de los úl-timos años destacan los poliquetos llamados come huesos y bombarderos. los primeros pertenecen al género Osedax y se descubrieron sobre los restos de una ballena gris a 2 891 m de profundidad en cali-fornia en 2004. carecen de tracto digestivo; en su lugar presentan una bolsa posterior con un s...

Based on a set of samples of the benthic fauna from several sites in the harbor area of Mazatlán, in the southern Gulf of California, Mexico, we report the occurrence of the non-indigenous invasive ascidian Polyclinum constellatum Savigny, 1816. It is recorded together with the parasitic cyclopoid copepod Haplostomides hawaiiensis Ooishi, 1994, ori...

The Mesoamerican Barrier Reef System (MBRS) comprises coral reefs in Mexico, Belize, Guatemala and Honduras. The Synoptic Monitoring Program (SMP) was developed to assess the coral reefs and associated ecosystems. This program is currently applied in most of the MPAs in the region. It includes sites selected within MPAs that represent strategic sit...

The copepod order Cyclopoida contains mainly forms that have been found as symbionts of different vertebrate and invertebrate hosts. One of these groups is the family Pseudanthessiidae, found mainly on echinoderms but very rarely on polychaetes. In this contribution, we report and confirm the occurrence of the pseudanthessiid copepod Pseudanthessiu...