scholarly journals Comparison of cnidae sizes between the two morphotypes of the giant Caribbean sea anemone Condylactis gigantea (Actiniaria: Actiniidae)

2018 ◽  
Vol 66 (3) ◽  
pp. 1055
Author(s):  
Ricardo Enrique González Muñoz ◽  
Carlos Hernández-Ortiz ◽  
Agustin Garese ◽  
Nuno Simões ◽  
Fabián Horacio Acuña
Keyword(s):  
Coral Reefs ◽  
Gulf Of Mexico ◽  
Related Species ◽  
Significant Variation ◽  
Caribbean Sea ◽  
Sea Anemone ◽  
Tropical Atlantic ◽  
Closely Related Species ◽  
Mexican Caribbean ◽  
Ecological Differences

The sea anemone Condylactis gigantea is an ecologically important member of the benthic community in coral reefs of the tropical Atlantic, and displays two morphotypes with respect to the color in their tentacular tips: the green tip morphotype and the pink/purple tip morphotype. Although some molecular and ecological differences have been found between these morphotypes, no other morphological distinctions have been reported, and currently both are still considered a single taxonomic species. In the present study, we perform an exploration on the variability in the size of cnidae between these two morphotypes and performed statistical analyses to compare the 10 categories of cnidae from specimens hosted in the Cnidarian Collection of Gulf of Mexico and Mexican Caribbean, of the Universidad Nacional Autónoma de México, which were previously collected in several coral reefs localities of the Yucatán Peninsula. Results reveal no significant variation in cnidae size between the two morphotypes, but significant variations were found within each morphotype. In addition, we update the composition of the cnidom of C. gigantea, and the utility of the size of cnidae to distinguish between morphotypes or closely related species is discussed.

Gracilaria falconii sp. nov. (Gracilariales, Rhodophyta): a new species with flat axes from Venezuela

Phytotaxa ◽  
2017 ◽  
Vol 292 (3) ◽  
pp. 271 ◽  
Author(s):  
SONIA ARDITO M. ◽  
MARÍA LUISA NÚÑEZ-RESENDIZ ◽  
KURT M. DRECKMANN ◽  
ABEL SENTÍES
Keyword(s):  
New Species ◽  
Gulf Of Mexico ◽  
Related Species ◽  
Caribbean Sea ◽  
Closely Related Species ◽  
The Caribbean ◽  
A New Species

Gracilaria falconii from Falcón, Venezuela, is described as a new species, based mainly on phylogenetic evidence. Morphologically, G. falconii is similar to G. mammillaris, a species previously reported from the Gulf of Mexico, the Caribbean Sea, Venezuela, and Brazil. Although G. falconii is morphologically different from phylogenetically closely related species, morphological boundaries between G. falconii and other flattened Gracilaria are not so clear.

scholarly journals Diversity of Siphonophora (Cnidaria: Hydrozoa) in the Western Caribbean Sea: new records from deep-water trawls

Zootaxa ◽  
2009 ◽  
Vol 2095 (1) ◽  
pp. 60-68 ◽  
Author(s):  
REBECA GASCA
Keyword(s):  
Deep Water ◽  
New Records ◽  
Caribbean Sea ◽  
Relative Increase ◽  
Tropical Atlantic ◽  
Atlantic Region ◽  
Surface Samples ◽  
Mexican Caribbean ◽  
Western Caribbean ◽  
The Caribbean

Siphonophores are one of the least known gelatinous zooplankters in the tropical waters of the Northwestern Atlantic. Most of the regional knowledge about their diversity and distribution is based on surface samples (0–200 m). Siphonophores were collected from oceanic waters off the Mexican Caribbean across an expanded sampling range (0–940 m) during two cruises and were taxonomically examined. A total of 47 siphonophore species were recorded, of these, 14 had not been found in this sector of the Caribbean Sea and 10 represent new records for the Caribbean Basin. The number of species currently known from the western Caribbean is increased from 42 to 56. Some of these species also represent new records for the Northwestern Tropical Atlantic region. The greatest relative increase was observed among species of Lensia, five of which are exclusively deep-living forms dwelling below 300 m. A revised, expanded checklist of the siphonophores of the Western Caribbean is also provided. These results confirm the need of further deep sampling to increase our understanding of Caribbean siphonophore diversity.

Distribution and Abundance of Phyllosoma Larvae (Decapoda, Palinuridae) in the Southern Gulf of Mexico and the Western Caribbean Sea

Crustaceana ◽  
2004 ◽  
Vol 77 (1) ◽  
pp. 75-93 ◽  
Author(s):  
Rebeca Gasca ◽  
Heyden Manzanilla-Dominguez
Keyword(s):  
Gulf Of Mexico ◽  
Spiny Lobster ◽  
Caribbean Sea ◽  
Larval Stages ◽  
Retention System ◽  
Mexican Caribbean ◽  
Caribbean Area ◽  
Western Caribbean ◽  
Southern Gulf Of Mexico ◽  
Phyllosoma Larvae

AbstractFrom plankton samples collected during two oceanographic expeditions in the southern Gulf of Mexico (1991) and five in the Mexican Caribbean Sea, we studied the composition, abundance, and distribution of the phyllosoma larvae. A total of 118 phyllosomas belonging to five species of lobster were recorded. Panulirus argus was the most abundant and dominant, it represented 73.9% of the total number of phyllosomas collected, followed by Scyllarides aequinoctialis (18.0%). The phyllosomas were distributed mainly in the coastal areas, with decreasing densities oceanwards. Highest larval concentrations were recorded near the outer border of the Campeche Bank shelf in the southern Gulf of Mexico. In the Mexican Caribbean area, phyllosomas were most abundant around Banco Chinchorro, off Espiritu Santo Bay and Ascension Bay, and near Isla Mujeres; these are well-known spawning areas for the spiny lobster, P. argus and are indicated by the presence of the earliest larval stages. The oldest larvae were concentrated on the Campeche Bank; this was attributed to the effect of a local gyre that retains these larvae. The youngest phyllosomas tended to have an oceanic distribution thus allowing them to enter the oceanic system of mesoscale gyres of the Gulf. In the Mexican Caribbean the coastal shoreward currents seem to act as a retention system for lobster larvae. The distribution of the phyllosoma stages in the Caribbean area suggests a continuous presence of different stages year-round. Some of these larvae, in the northeastern sector, would likely be transported to the Campeche Bank.

scholarly journals Male–only care and classical polyandry in birds: phylogeny, ecology and sex differences in remating opportunities

2002 ◽  
Vol 357 (1419) ◽  
pp. 283-293 ◽  
Author(s):  
I. P. F. Owens
Keyword(s):  
Sex Differences ◽  
Related Species ◽  
Egg Size ◽  
Breeding Systems ◽  
Female Size ◽  
Huge Number ◽  
Closely Related Species ◽  
Significant Difference ◽  
Low Rate ◽  
Ecological Differences

It has been argued recently that the combination of male–only parental care and classical polyandry in birds is the most interesting and yet the least understood of all avian breeding systems. Despite a huge number of hypotheses, careful comparative analyses have repeatedly failed to identify consistent ecological differences between species showing male–only care and closely related species showing other patterns of care. This has led to the suggestion that such analyses fail because the crucial differences are between ancient lineages rather than between closely related species. Here, therefore, I use comparisons between families to test three well–known hypotheses: that male–only care is associated with: (i) a low rate of fecundity; (ii) large egg size relative to female size; or (iii) female–biased opportunities for remating. Families showing male–only care do not differ from families showing female–only care with respect to rate of fecundity or relative egg size. There is, however, a significant difference between these two groups of families with respect to an index of remating opportunities, nesting density. Families showing female–only care nest at high density, while those showing male–only care nest at very low density. This is one of the first times a consistent ecological correlate has been identified for male–only care in birds. It suggests that female–only care arises (or persists) in families where remating opportunities are abundant for both sexes, whereas male–only care arises (or persists) in families where remating opportunities are rare for both sexes and particularly scarce for males. This in turn suggests that sex differences in remating opportunities are the key ecological factor in determining male–only care and classical polyandry in birds.

A checklist of the Medusae (Hydrozoa, Scyphozoa and Cubozoa) of Mexico

Zootaxa ◽  
2003 ◽  
Vol 194 (1) ◽  
pp. 1 ◽  
Author(s):  
LOURDES SEGURA-PUERTAS ◽  
EDUARDO SUÁREZ-MORALES ◽  
LAURA CELIS
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Gulf Of Mexico ◽  
Caribbean Sea ◽  
Number Of Species ◽  
The Pacific ◽  
Mexican Caribbean ◽  
The Pacific Ocean ◽  
First Time

A list of 169 medusae species in 45 families recorded in Mexican waters is presented for the first time. 86 species (50.8%) were found in the Pacific Ocean, 75 species (44.3%) in the Gulf of Mexico, and 88 (52%) in the Mexican Caribbean Sea. Only 17 species (10%) were common to the three regions. The superclass Hydrozoa, the most diverse one, is represented by 151 species (89%), the Scyphozoa by 16 species (9.5%) and the Cubozoa by 3 (1.8%). Among the Hydrozoa, up to 6 new species have been described from Mexican waters. It is expected that the number of species will grow as surveys that include the hydroid stages and their laboratory-released medusae, as well as benthic and deep-living medusofauna are undertaken in both the Atlantic and the Pacific coasts of Mexico.

scholarly journals Gene flow between subpopulations of gray snapper (Lutjanus griseus) from the Caribbean and Gulf of Mexico

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8485
Author(s):  
Oscar de Jesús Rosado-Nic ◽  
J. Derek Hogan ◽  
José Héctor Lara-Arenas ◽  
Rigoberto Rosas-Luis ◽  
Laura Carrillo ◽  
...  
Keyword(s):  
Gene Flow ◽  
Gulf Of Mexico ◽  
Genetic Difference ◽  
Caribbean Sea ◽  
Genetic Connectivity ◽  
Migration Rates ◽  
Lutjanus Griseus ◽  
Mexican Caribbean ◽  
Southern Gulf Of Mexico ◽  
Gray Snapper

Background The gray snapper (Lutjanus griseus) has a tropical and subtropical distribution. In much of its range this species represents one of the most important fishery resources because of its high quality meat and market value. Due to this, this species is vulnerable to overfishing, and population declines have been observed in parts of its range. In recent decades, it has been established that knowing the level of genetic connectivity is useful for establishing appropriate management and conservation strategies given that genetic isolation can drive towards genetic loss. Presently the level of genetic connectivity between subpopulations of L. griseus of the southern region of the Gulf of Mexico and the Caribbean Sea remains unknown. Methods In the present study we analyze genetic structure and diversity for seven subpopulations in the southern Gulf of Mexico and the Mexican Caribbean Sea. Eight microsatellite primers of phylogenetically closely related species to L. griseus were selected. Results Total heterozygosity was 0.628 and 0.647 in the southern Gulf of Mexico and the Mexican Caribbean Sea, however, results obtained from AMOVA and RST indicated a lack of genetic difference between the major basins. We also found no association between genetic difference and geographic distance, and moderately high migration rates (Nm = > 4.1) suggesting ongoing gene flow among the subpopulations. Gene flow within the southern Gulf of Mexico appears to be stronger going from east-to-west. Conclusions Migration rates tended to be higher between subpopulations within the same basin compared to those across basins indicating some regionalization. High levels of genetic diversity and genetic flow suggest that the population is quite large; apparently, the fishing pressure has not caused a bottleneck effect.

scholarly journals An Integrated Observing Effort for Sargassum Monitoring and Warning in the Caribbean Sea, Tropical Atlantic, and Gulf of Mexico

Oceanography ◽  
2021 ◽  
pp. 68-69
Author(s):  
Joaquin Triñanes ◽  
◽  
Chuanmin Hu ◽  
Nathan Putman ◽  
Maria Olascoaga ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Caribbean Sea ◽  
Tropical Atlantic ◽  
The Caribbean

A new sponge-inhabiting leptostracan species of the genus Nebalia (Crustacea: Phyllocarida: Leptostraca) from the Veracruz Coral Reef System, Gulf of Mexico

Zootaxa ◽  
2011 ◽  
Vol 3027 (1) ◽  
pp. 52 ◽  
Author(s):  
MANUEL ORTIZ ◽  
IGNACIO WINFIELD ◽  
SERGIO CHÁZARO-OLVERA
Keyword(s):  
New Species ◽  
Coral Reef ◽  
Gulf Of Mexico ◽  
Related Species ◽  
First Record ◽  
Closely Related Species ◽  
Reef System ◽  
A New Species ◽  
Coral Reef System

A new species of Leptostraca, Nebalia villalobosi, is described from the Veracruz Coral Reef System, SW Gulf of Mexico. The new species was found associated with the sponge Ircinia fistularis (Demospongiae) from the Blanquilla reef at a depth of 12 m. It differs from the closely related species N. longicornis and N. lagartensis in the form of the eyes and rostrum, the number of articles in the antennular and antennal flagella, the inner border of article 3 on the mandible palp, the length of the exopod of maxilla 2, the rounded denticles on pleonite 6, the enlarged tip on pleopod 5, and the caudal furcae being slightly longer than the telson and pleonite 7 combined. This is the first record of a leptostracan associated with the sponge Ircinia fistularis.

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