Titre du document / Document title

Development of transformation larvae and juveniles of Ctenogobius boleosoma, Ctenogobius shufeldti, and Gobionellus oceanicus (Pisces:Gobiidae) from Western North Atlantic Estuaries, with notes on early life history

Auteur(s) / Author(s)

WYANSKI David M. ⁽¹⁾ ; TARGETT Timothy E. ⁽²⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Marine Resources Research Institute, South Carolina Dept. of Natural Resources, P.O. Box 12559, Charleston, South Carolina 29422-2559, ETATS-UNIS
⁽²⁾ University of Delaware, Graduate College of Marine Studies, Lewes, Delaware 19958, ETATS-UNIS

Résumé / Abstract

Development of transformation larvae and juveniles of the sympatric estuarine gobies Ctenogobius boleosoma (7.1-19.8 mm standard length (SL)), Ctenogobius shufeldti(10.1-19.9 mm SL), and Gobionellus oceanicus (10.5-19.6 mm SL), is described and partly illustrated. Specimens from the Atlantic (n = 102) and Gulf of Mexico (n = 22) coasts of the United States were examined. Ctenogobius boleosoma and C. shufeldti (formerly assigned to Gobionellus) have been placed in Ctenogobius by Pezold (1984). The present study describes larvae of C. boleosoma and G. oceanicus that are more developed than larvae in the same size range described in previous studies. Presence of a vertical internal streak of melanin in the caudal peduncle, between lateral and ventral midlines, distinguishes transformation larvae of C. boleosoma from those of G. oceanicus. Transforming C. boleosoma have greater relative head length, eye diameter, body depth, and least depth of caudal peduncle than G. oceanicus. Pectoral and pelvic fins of transforming C. boleosoma extend beyond a vertical through the anterior margin of the gas bladder, but they do not reach this vertical in G. oceanicus. Presence of an internal V-shaped spot on the nape distinguishes late transformation larvae and juveniles of C. boleosoma from those of G. oceanicus and C. shufeldti. Juvenile C. boleosoma and C. shufeldti have greater relative eye diameter, body depth, and least depth of caudal peduncle than G. oceanicus. A provisional key is presented to distinguish among early stages of these species of Ctenogobius and Gobionellus, and Evorthodus lyricus, a sympatric goby with six spines. Moderate variation in morphometric characters was noted, but it was difficult to identify causes. Factors considered were geographic area, preservative, and variation in size at transformation. Occurrence of early stages and adults in the same intertidal habitats was noted for C. boleosoma and C. shufeldti. Based on occurrence of transformation larvae, C. boleosoma spawns during summer and fall along the Atlantic coast. Ctenogobius shufeldti has a more narrow range of temperature tolerance than C. boleosoma.

Revue / Journal Title

Bulletin of marine science   ISSN 0007-4977   CODEN BMRSAW 

Source / Source

2000, vol. 67, n^o2, pp. 709-728 (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Allen, Lawrence, KA, ETATS-UNIS  (1965) (Revue)

Mots-clés anglais / English Keywords

Larva ; Young animal ; Metamorphosis ; Life history ; Development ; Corporal biometry ; Meristic character ; Taxonomic key ; Interspecific comparison ; Estuaries ; Georgia ; United States ; North America ; America ; Gobiidae ; Pisces ; Vertebrata ; Brackish water environment ;

Mots-clés français / French Keywords

Larve ; Animal jeune ; Métamorphose ; Cycle évolutif ; Développement ; Biométrie corporelle ; Caractère méristique ; Clé détermination ; Comparaison interspécifique ; Estuaire ; Géorgie ; Ctenogobius boleosoma ; Ctenogobius shufeldti ; Gobionellus oceanicus ; Etats Unis ; Amérique du Nord ; Amérique ; Gobiidae ; Pisces ; Vertebrata ; Milieu saumâtre ;

Mots-clés espagnols / Spanish Keywords

Larva ; Animal joven ; Metamórfosis ; Ciclo evolutivo ; Desarrollo ; Biometría corporal ; Carácter merístico ; Clave determinación ; Comparación interespecífica ; Estuario ; Georgia ; Estados Unidos ; America del norte ; America ; Gobiidae ; Pisces ; Vertebrata ; Medio salobre ;

Localisation / Location

INIST-CNRS, Cote INIST : 11286, 35400009278863.0030