scholarly journals Subterranean Waters of Yucatán Peninsula, Mexico Reveal Epigean Species Dominance and Intraspecific Variability in Freshwater Ostracodes (Crustacea: Ostracoda)

Diversity ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 44
Author(s):  
Laura Macario-González ◽  
Sergio Cohuo ◽  
Dorottya Angyal ◽  
Liseth Pérez ◽  
Maite Mascaró
Keyword(s):  
18S Rdna ◽  
Yucatan Peninsula ◽  
Morphological Variability ◽  
Biological Evolution ◽  
Intraspecific Variability ◽  
Abundant Species ◽  
Species Dominance ◽  
Yucatán Peninsula ◽  
Morphometric Analyses ◽  
Cypridopsis Vidua

The Yucatán Peninsula is a karstic region, rich in subterranean environments with a diverse crustacean stygobiont fauna. In order to gain insights into the biological evolution of the subterranean environments of this region, we evaluated the ostracode species composition of caves and cenotes in five independent sampling campaigns (2008, 2013, 2017–2019). Using morphometric analyses, we evaluated inter-population morphological variability; using molecular analysis based on mitochondrial COI and nuclear 18S rDNA, we evaluated genetic differentiation in selected species. The observed fauna is composed of 20 (epigean) species, presenting a lack of strict stygobionts. Morphometric analyses discriminated up to three morphotypes in each of the three most abundant species: Cytheridella ilosvayi, Alicenula sp. and Cypridopsis vidua. High intraspecific morphological variability was found either in shape or size. Phylogenetic analysis based on COI demonstrated the existence of three lineages on C. ilosvayi, with high support (>0.9). The 18S rDNA sequences were identical among individuals of different populations. A lack of congruence between the genetic markers precluded us from postulating speciation in subterranean environments. It is likely that Late Pleistocene—Early Holocene climate variation related to sea level and precipitation was forcing agent for epigean ostracode dominance in subterranean environments of the Peninsula.

Hypnea musciformis(Cystocloniaceae) from the Yucatan Peninsula: morphological variability in relation to life-cycle phase

Phycologia ◽  
2016 ◽  
Vol 55 (2) ◽  
pp. 230-242 ◽  
Author(s):  
Erika Vázquez-Delfín ◽  
Ga Hun Boo ◽  
Dení Rodríguez ◽  
Sung Min Boo ◽  
Daniel Robledo
Keyword(s):  
Life Cycle ◽  
Yucatan Peninsula ◽  
Morphological Variability ◽  
Cycle Phase ◽  
Hypnea Musciformis ◽  
Yucatán Peninsula ◽  
Life Cycle Phase

scholarly journals Molecular assessment of the species of Gracilariaceae (Gracilariales, Rhodophyta) from the Yucatan Peninsula, Mexico, including two new records for the Mexican Atlantic

2022 ◽  
Vol 1 (1) ◽  
Author(s):  
Martha I. Vilchis ◽  
Kurt M. Dreckmann ◽  
Oscar E. Hernández ◽  
Carlos A. Palma Ortíz ◽  
María Luisa Núñez Resendiz ◽  
...  
Keyword(s):  
New Records ◽  
Yucatan Peninsula ◽  
Morphological Variability ◽  
Genetic Distances ◽  
Quintana Roo ◽  
Yucatán Peninsula ◽  
The Family ◽  
Gracilariopsis Tenuifrons ◽  
Molecular Assessment ◽  
Rbcl Sequences

Background. The Gracilariaceae is one of the most diverse and abundant families of marine red algae. Most species in this family exhibit high morphological variability and overlapping of characters. In the Yucatan Peninsula 30 species have been historically recorded, but the phylogenetic identity for many of them is still unknown. Questions: Is the current diversity of the family in the area overestimated? Studied species: Crassiphycus caudatus, C. corneus, C. usneoides, Gracilaria flabelliformis, G. hayi, G. cf isabellana, G. microcarpa, G. occidentalis, G. suzanneae, Gracilariopsis tenuifrons. Study site and dates: Campeche: km 33 carretera Champotón, Bahía Tortuga, Puente Xen Kan III, Punta Xen, Sabancuy, 2017, 2018; Yucatan: Puerto Sisal, Puerto Progreso, Puerto Chicxulub, Puerto Telchac, 2018; Quintana Roo: Playa 88, Xcalacoco, Punta Esmeralda, 2019. Methods. Phylogenetic analysis (with COI-5P and rbcL sequences), supported by DNA species delimitation methods, genetic distances and morphological comparisons, allowed us to molecularly identify the specimens collected. Results. The phylogenetic identity of 10 species of Gracilariaceae was confirmed, two of which are new records for the Mexican Atlantic: G. hayi and G. suzanneae. Conclusion. The study demonstrated that the molecular assessment has proved to be very useful for the diversity evaluation, thus, the future phylogenetic identifies for the rest of morphospecies recorded in the area will allow a better approximation of Gracilariaceae diversity species.

scholarly journals A new parrot taxon from the Yucatán Peninsula, Mexico—its position within genusAmazonabased on morphology and molecular phylogeny

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3475
Author(s):  
Tony Silva ◽  
Antonio Guzmán ◽  
Adam D. Urantówka ◽  
Paweł Mackiewicz
Keyword(s):  
Central America ◽  
Yucatan Peninsula ◽  
Strong Support ◽  
Taxonomic Status ◽  
Molecular Dating ◽  
Morphometric Characters ◽  
Interesting Insight ◽  
Yucatán Peninsula ◽  
Morphometric Analyses ◽  
And Behavior

Parrots (Psittaciformes) are a diverse group of birds which need urgent protection. However, many taxa from this order have an unresolved status, which makes their conservation difficult. One species-rich parrot genus isAmazona, which is widely distributed in the New World. Here we describe a newAmazonaform, which is endemic to the Yucatán Peninsula. This parrot is clearly separable from otherAmazonaspecies in eleven morphometric characters as well as call and behavior. The clear differences in these features imply that the parrot most likely represents a new species. In contrast to this, the phylogenetic tree based on mitochondrial markers shows that this parrot groups with strong support withinA. albifronsfrom Central America, which would suggest that it is a subspecies ofA. albifrons. However, taken together tree topology tests and morphometric analyses, we can conclude that the new parrot represents a recently evolving species, whose taxonomic status should be further confirmed. This lineage diverged from its closest relative about 120,000 years ago and was subjected to accelerated morphological and behavioral changes like some other representatives of the genusAmazona. Our phylogenies, which are so far the most comprehensive forAmazonataxa enabled us to consider the most feasible scenarios about parrot colonization of the Greater and Lesser Antilles and Central America from South America mainland. The molecular dating of these migrations and diversification rate were correlated with climatic and geological events in the last five million years, giving an interesting insight into Amazon parrot phylogeography and their evolution in general.

scholarly journals Morphometrics of Amblyomma mixtum in the State of Veracruz, Mexico

Pathogens ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 533
Author(s):  
Mariel Aguilar-Domínguez ◽  
Dora Romero-Salas ◽  
Sokani Sánchez-Montes ◽  
Ricardo Serna-Lagunes ◽  
Greta Rosas-Saito ◽  
...  
Keyword(s):  
Intraspecific Variation ◽  
Morphological Variability ◽  
Intraspecific Variability ◽  
Morphological Differentiation ◽  
The State ◽  
Morphometric Characteristics ◽  
Public Health Importance ◽  
Morphometric Analyses ◽  
Main Components ◽  
Main Component

The tick Amblyomma mixtum is an ectoparasite of veterinary and public health importance because of its role as a vector of zoonotic pathogens. However, little is known about A. mixtum intraspecific variability and if morphological differentiation exists between populations across its geographic range. This study aimed to determine by electron microscopy the morphological variability of A. mixtum populations in the state of Veracruz, which has a large livestock population among states in Mexico. Forty male and 40 female A. mixtum collected from the 10 natural regions of Veracruz state were analyzed microscopically to accomplish main component analysis for each sex. Clusters were calculated with the out-tree method and a dendrogram produced to group the specimens according to their morphometric characteristics. Using 10 main components, 77% of the morphological variation of the ticks was explained. This is a reflection of scarce intraspecific variation between females. The dendogram for females grouped six clusters of specimens with similar characteristics. Morphometric variability in males was described using eight main components. Limited intraspecific variation was also observed between males. In males, the dendogram yielded six groups with similar morphometric characteristics. Morphometric analyses confirmed that the only species from the Amblyomma cajennense complex that are parasites to livestock in Veracruz state is A. mixtum. The eryxenous nature of A. mixtum combined with the frequent movement of livestock hosts may contribute to the apparent homogeneous phenotype of this tick species in Mexico.

Octopus maya parasites off the Yucatán Peninsula, Mexico. II. Salivary gland damage by cestodes

2018 ◽  
Vol 130 (1) ◽  
pp. 45-50 ◽  
Author(s):  
S Guillén-Hernández ◽  
C González-Salas ◽  
D Pech-Puch ◽  
H Villegas-Hernández
Keyword(s):  
Salivary Gland ◽  
Yucatan Peninsula ◽  
Yucatán Peninsula ◽  
Octopus Maya

COASTAL CARBONATE CRITICAL ZONES: AN EXAMPLE FROM THE YUCATAN PENINSULA

2019 ◽  
Author(s):  
Jonathan B. Martin ◽  
◽  
Andrea J. Pain ◽  
Caitlin Young ◽  
Arnoldo Valle-Levinson
Keyword(s):  
Yucatan Peninsula ◽  
Yucatán Peninsula ◽  
Critical Zones

Tropical fossil mitogenomes: Holocene biogeography of two codistributed rodent genera from the Yucatán peninsula

2021 ◽  
Vol 38 ◽  
pp. 103028
Author(s):  
Tania A. Gutiérrez-García ◽  
Kyle J. Shaney ◽  
Ella Vázquez-Domínguez ◽  
Jacob Enk ◽  
Joaquín Arroyo-Cabrales
Keyword(s):  
Yucatan Peninsula ◽  
Yucatán Peninsula

scholarly journals Spatial distribution overview of rotifers in the Yucatán peninsula, México

2021 ◽  
Vol 7 (1) ◽  
pp. 1879450
Author(s):  
Jesús Alvarado-Flores ◽  
Jovana Lizeth Arroyo-Castro ◽  
Leonela Chavez-Flores ◽  
Ailem Guadalupe Marin-Chan
Keyword(s):  
Spatial Distribution ◽  
Yucatan Peninsula ◽  
Yucatán Peninsula
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