Colony morphology, age structure, and relative growth of two gorgonian corals, Leptogorgia hebes (Verrill) and Leptogorgia virgulata (Lamarck), from the northerm Gulf of Mexico

Coral Reefs ◽  
1993 ◽  
Vol 12 (2) ◽  
pp. 65-70 ◽  
Author(s):  
Naomi D. Mitchell ◽  
Michael R. Dardeau ◽  
William W. Schroeder
Keyword(s):  
Gulf Of Mexico ◽  
Age Structure ◽  
Colony Morphology ◽  
Relative Growth ◽  
Leptogorgia Virgulata ◽  
Gorgonian Corals

Influence of artisanal fisheries on the behaviour and social structure of Tursiops truncatus in the South-western Gulf of Mexico

2019 ◽  
Vol 99 (8) ◽  
pp. 1841-1849
Author(s):  
Nataly Morales-Rincon ◽  
Eduardo Morteo ◽  
Christian Alejandro Delfín-Alfonso
Keyword(s):  
Gulf Of Mexico ◽  
Group Size ◽  
Age Structure ◽  
Human Activities ◽  
Tursiops Truncatus ◽  
Bottlenose Dolphins ◽  
Vantage Point ◽  
Competitive Interactions ◽  
Artisanal Fisheries ◽  
Behavioural Plasticity

AbstractBehavioural plasticity in animals is tested whenever competitive interactions for space and/or food resources occur between wildlife and human activities. This study uses the concepts of operational and non-operational interactions between bottlenose dolphins (Tursiops truncatus) and artisanal fisheries in Alvarado, to search for differences in behaviour, age structure and group size. We conducted 20 surveys between 2015 and 2016, and recorded 64 groups by means of scan sampling from either a research boat or a fixed vantage point. Average dolphin group size was small (${\bar{\rm x}}$ = 3.2, SD = 2.2 individuals) and fewer individuals were commonly present when interaction with fisheries occurred. Operational interactions were defined within the first 30 m and occurred mainly with lone individuals (54% recorded from the lighthouse and 82% during surveys); this benchmark also accounted for higher frequencies in locomotion and feeding (χ2 = 83.10; df = 7; P < 0.001). We found a higher rate of new behavioural events for dolphin groups furthest from human activities, as well as a decrease in behaviours that imply greater body exposure as dolphins approach the fishing spots. Age structure and dolphin group size were not different during and in the absence of interaction with fisheries, but most interactions involved male dolphins. Behavioural variations in the dolphins' repertoire are likely a strategy to reduce the risk of injuries or death when interacting with human activities; these dolphins seem to have habituated to or at least tolerate fishing activities within the study area, possibly constituting a sex-biased pressure.

Morphometry and relative growth of the swimming crab, Portunus Spinicarpus (Stimpson, 1871) from the southern Gulf of Mexico

Crustaceana ◽  
2008 ◽  
Vol 81 (3) ◽  
pp. 329-339 ◽  
Author(s):  
Adolfo Gracia ◽  
Ana Rosa Vázquez-Bader ◽  
Alejandro Gómez-Ponce ◽  
Laura Sanvicente-Añorve
Keyword(s):  
Gulf Of Mexico ◽  
Swimming Crab ◽  
Relative Growth ◽  
Southern Gulf Of Mexico

Relative growth and size at first maturity of the deep water shrimp,Heterocarpus Ensifer (Decapoda, Pandalidae) from the southern Gulf of Mexico

Crustaceana ◽  
2007 ◽  
Vol 80 (5) ◽  
pp. 555-568 ◽  
Author(s):  
Enrique Lozano-Álvarez ◽  
Ana Vázquez-Bader ◽  
Patricia Briones-Fourzán ◽  
Adolfo Gracia
Keyword(s):  
Gulf Of Mexico ◽  
Deep Water ◽  
Relative Growth ◽  
Southern Gulf Of Mexico ◽  
First Maturity ◽  
Size At First Maturity

scholarly journals Secondary production of gorgonian corals in the northern Gulf of Mexico

1992 ◽  
Vol 87 ◽  
pp. 275-281 ◽  
Author(s):  
ND Mitchell ◽  
MR Dardeau ◽  
WW Schroeder ◽  
AC Benke
Keyword(s):  
Gulf Of Mexico ◽  
Secondary Production ◽  
Northern Gulf Of Mexico ◽  
Gorgonian Corals
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