Diferencias entre sexos en la composición de la dieta natural de la langosta Panulirus argus (Decapoda: Palinuridae) al este del golfo de Batabanó, Cuba

• Martínez Coello, Diana ^[1] ; Lopeztegui Castillo, Alexander ^[1] ; Amor Marrero, Ulises ^[1]
  1. [1] Centro de Investigaciones Pesqueras
• Localización: Research journal of the Costa Rican Distance Education University: Cuadernos de Investigación UNED, ISSN-e 1659-4266, ISSN 1659-441X, Vol. 7, Nº. 2, 2015, págs. 269-277
• Idioma: español
• Títulos paralelos:
  • Sex differences in the composition of the natural diet of Panulirus argus (Decapoda: Palinuridae) in the eastern of the Gulf of Batabano, Cuba
• Enlaces
  • Texto completo
• Resumen
  • español

    Con el objetivo de identificar los organismos que conforman la dieta natural de la langosta Panulirus argus y determinar diferencias entre sexos en cuanto a la importancia de cada presa, se analizaron 30 estómagos con contenido (16 hembras y 14 machos), extraídos de langostas capturadas al Este del golfo de Batabanó. Se identificaron 15 entidades alimentarias (12 en las hembras y 14 en los machos). Las entidades preferenciales coincidieron en ambos sexos, aunque en los machos se incluyeron además los foraminíferos y los restos minerales. Los crustáceos fueron el único grupo de importancia alta y son las presas mayormente consumidas (G=62.3% en las hembras y G=40% en los machos). Se determinó la presencia de opérculos de Lobatus gigas, Turbo castanea, Fasciolaria tulipa, Nassarius antillarum, Cerithium sp y Tegula fasciata, que fue la que mostró mayor presión de depredación (2.25 en las hembras y 2.14 en los machos). Esta especie junto a Cerithium sp. fueron las que presentaron mayor abundancia numérica (60.5% y 33.9% respectivamente). La prueba U de Mann-Whitney arrojó que entre sexos no existen diferencias en el peso del contenido estomacal. La similaridad entre las dietas fue de 96.75% y se compone fundamentalmente de crustáceos y moluscos.  

  • English

    The spiny lobster Panulirus argus is one of the most valuable fishery resources in the Caribbean Sea. This is the only species of lobster that has commercial importance in Cuba. This study was aimed to identify the organisms that conform the natural diet for both sexes of P. argus and to determine the importance of each prey in the diet of each sex. A total of 30 stomachs of commercial lobsters (≥ 76mm of carapace length) was analyzed. The identified content was grouping by items and classified for species if it was possible. The total weight of each item was determined and the gravimetric method was applied to estimate the relative weight of the principal diet components. The most frequently consumed prey was also determined. Items with high, middle or low importance were established by the relative importance index (IIR). Similarities between both sexes diet were estimated by similarity index (ISe). Stomachs were extracted of lobsters captured in a fishing zones from eastern of the gulf of Batabano. The predation pressure (P) on the mollusks species found in the stomach content was calculated based on the respective opercula. It was possible to identified 15 feeding entities (12 in females and 14 in the males) being the preferences: crustacean rests (100%), shell rests (80%), vegetable rests (70%), opercula (63%) and mineral rests (53%). Those preference entities were the same between sexes although in the males the foraminifera and the mineral rest were included. The IIR showed crustaceans as a single group of high importance. The gravimetric analysis showed crustaceans as the most consumed prey (62.3% in females and 40% in males). The opercula of Lobatus gigas, Turbo castanea, Fasciolaria tulipa, Nassarius antillarum, Cerithium sp and Tegula fasciata were found. Tegula fasciata showed the highest predation pressure (2.25 in females and 2.14 in males) and together Cerithium sp. they were the most abundant species (60.5% and 33.9% respectively). Respect to the weight of stomach contents the Mann-Whitney test showed no significant difference between females and males. The diet of both sexes of P. argus in the assessed area was similar (ISe=96.75%) and it was constituted mainly of crustaceans and mollusks.