scholarly journals Abundancia y ecología trófica del pez león, Pterois volitans, en el Parque Nacional Morrocoy, Venezuela, mar Caribe Sur

2021 ◽  
Vol 56 (2) ◽  
pp. 134-144
Author(s):  
Naily Nashira Figueroa-López ◽  
José Gregorio Rodríguez-Quintal ◽  
Antonio Brante
Keyword(s):  

La invasión del pez león, Pterois volitans, en la costa Atlántica de los Estados Unidos y el mar Caribe representa una amenaza al funcionamiento del ecosistema marino. En 2010 fue reportado por primera vez en las costas venezolanas, y en 2013 ya era común en zonas arrecifales. El objetivo del presente estudio fue evaluar la abundancia y la ecología trófica del pez león en el Parque Nacional Morrocoy, y comparar su abundancia con la de otras especies nativas. En 2013 se realizaron censos visuales y recolectaron especímenes en diferentes hábitats (arrecifes, praderas de fanerógamas y manglares) y estratos de profundidad (1-3 m, 6-9 m, 12-15 m). Los resultados mostraron una alta variabilidad en la abundancia, con una densidad promedio de 46,30 (± 42,31 DE) peces∙ha-1 en arrecifes, mientras que en praderas de fanerógamas y manglares no se observó la presencia de la especie. Su densidad no difirió entre estratos de profundidad y fue significativamente mayor a la de las especies nativas censadas (familias Muraenidae y Serranidae). Su dieta estuvo compuesta de peces y crustáceos, con una mayor proporción de peces en especímenes de mayor tamaño. Las familias de peces más abundantes dentro del parque, Labridae, Haemulidae y Gobiidae, formaron parte de su dieta. Dadas las características del pez león como depredador generalista, un aumento de su población posiblemente afectaría significativamente la abundancia de peces nativos de las familias más representadas en su dieta, y la estructura y funcionamiento de estos sistemas arrecifales.

2018 ◽  
Author(s):  
Juan Carlos Villaseñor-Derbez

Stomach contents were analyzed from 109 individuals. A total of 4 Genera and 14 Species were identified. Crustaceans accounted for %N=67.39% , %IRI= 86.37% of the total identified taxa and Teleosts %N=32.61% (%IRI = 13.63%). An ontogenetic change was observed in P. volitans diet.


2009 ◽  
Vol 4 (3) ◽  
pp. 507-510 ◽  
Author(s):  
Juliana González ◽  
Marcela Grijalba-Bendeck ◽  
Arturo Acero ◽  
Ricardo Betancur-R.

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 977.1-977
Author(s):  
A. Potapova ◽  
O. Egorova ◽  
O. Alekseeva ◽  
A. Volkov ◽  
S. Radenska-Lopovok

Background:Ultrasound (US) is a non-invasive and safe imaging method that allows in vivo differentiation of the morphological structures of subcutaneous fat (SCF) tissue in in normal and pathology.Objectives:Reveal features of ultrasound changes in SCF in panniculitis (Pn).Methods:57 patients (f – 45, m - 12) aged 18 - 67 years with an initial diagnosis of erythema nodosum and a disease duration of 3.6 ± 1.4 years were examined. In addition to the general clinical examination, a computed tomography of the chest organs and a pathomorphological examination of a skin biopsy from the site of the node were performed. Ultrasound was performed on a MyLabTwice apparatus (ESAOTE, Italy) using a multi-frequency linear transducer (10-18 MHz) with the PD technique, the parameters of which were adapted for recording low-speed flows (PRF 300-600 Hz, low filter, dynamic range - 20-40 dB), the presence of vascularization was assessed not only in the affected area, but also on the contralateral side using high-energy Doppler.Results:33 patients were diagnosed with septal Pn (SPn), 24 - lobular Pn (LPn). In all cases, the diagnosis was verified by histological examination. Ultrasound made it possible to assess the thickness, echoicity and vascularization of the SCF. In 35 patients, significant thickening of the SCF was revealed (as compared to the contralateral side), of which in 14 cases with SPn, in 21 - with LPn. Significant diffuse thickening of the SCF with the contralateral side was observed in 18 patients, incl. in 12 (66%) patients with LPn. Limited thickening was more typical for SPn (73%). A significant increase in the echoicity of the SCF was noted in all forms of Pn. A “lobular” echo pattern with an anechogenic environment was observed in 25 patients, of which 18 (72%) had LPn. An increase in vascularization compared to the contralateral side was recorded in 30 cases (SPn-17, LPn-13).Conclusion:The obtained preliminary results indicate the important role of ultrasound in assessing the depth and prevalence of the inflammatory process at Pn. To clarify the diagnostic value of this method, further studies are needed on a larger sample of patients.Disclosure of Interests:None declared


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