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.

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 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.

Subtle genetic connectivity between Mexican Caribbean and south-western Gulf of Mexico reefs: the case of the bicolor damselfish, Stegastes partitus

Coral Reefs ◽  
2013 ◽  
Vol 33 (1) ◽  
pp. 241-251 ◽  
Author(s):  
C. A. Villegas Sánchez ◽  
H. Pérez España ◽  
R. Rivera Madrid ◽  
D. Salas Monreal ◽  
J. E. Arias González
Keyword(s):  
Gulf Of Mexico ◽  
Genetic Connectivity ◽  
Stegastes Partitus ◽  
Mexican Caribbean ◽  
Bicolor Damselfish

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.

INFLUENCES OF UPPER FLORIDAN AQUIFER WATERS ON RADIOCARBON IN THE OTOLITHS OF GRAY SNAPPER (Lutjanus griseus) IN THE GULF OF MEXICO

Radiocarbon ◽  
2020 ◽  
Vol 62 (5) ◽  
pp. 1127-1146
Author(s):  
Allen H Andrews ◽  
Beverly K Barnett ◽  
Jeffrey P Chanton ◽  
Laura A Thornton ◽  
Robert J Allman
Keyword(s):  
Gulf Of Mexico ◽  
Age And Growth ◽  
Specific Marker ◽  
Floridan Aquifer ◽  
Lutjanus Griseus ◽  
Upper Floridan Aquifer ◽  
Time Specific ◽  
Mexico Coast ◽  
Gray Snapper ◽  
Inorganic Carbonate

ABSTRACTThe otoliths (ear stones) of fishes are commonly used to describe the age and growth of marine and freshwater fishes. These non-skeletal structures are fortuitous in their utility by being composed of mostly inorganic carbonate that is inert through the life of the fish. This conserved record functions like an environmental chronometer and bomb-produced radiocarbon (14C)—a 14C signal created by atmospheric testing of thermonuclear devices—can be used as a time-specific marker in validating fish age. However, complications from the hydrogeology of nearshore marine environments can complicate 14C levels, as was the case with gray snapper (Lutjanus griseus) along the Gulf of Mexico coast of Florida. Radiocarbon of these nearshore waters is influenced by freshwater input from the karst topography of the Upper Floridan Aquifer—estuarine waters that are 14C-depleted from surface and groundwater inputs. Some gray snapper likely recruited to this kind of environment where 14C levels were depleted in the earliest otolith growth, although age was validated for individuals that were not exposed to 14C-depleted waters to an age of at least 25 years with support for a 30-year lifespan.

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