Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3201
Carlos Canales-Cerro, Naití A. Morales, F. J. Concha, Francisco Fernandoy, S. Hernández, Roberto Meléndez, Sebastian A. Klarian
Little has been studied of the food metrics of most chondrichthyans, which provide baseline information for the assessment of fishing status to guide the development of ecosystem-based management plans. Therefore, the main goal of this study was to approach the isotopic niche of Dipturus chilensis and Callorhinchus callorynchus in Valparaíso (central Chile). The main findings showed that C. callorynchus presented a narrow ellipse (E= 0.79; RC= 4.14; θ= 1.39), meanwhile D. chilensis, presented an ellipse with greater extension (E= 0.95; RC= 8,23; θ= -0.11), therefore a wide isotopic niche.
{"title":"Métricas alimentarias de dos condrictios meso-bentónicos en aguas de Chile central","authors":"Carlos Canales-Cerro, Naití A. Morales, F. J. Concha, Francisco Fernandoy, S. Hernández, Roberto Meléndez, Sebastian A. Klarian","doi":"10.22370/rbmo.2022.57.especial.3201","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3201","url":null,"abstract":"Little has been studied of the food metrics of most chondrichthyans, which provide baseline information for the assessment of fishing status to guide the development of ecosystem-based management plans. Therefore, the main goal of this study was to approach the isotopic niche of Dipturus chilensis and Callorhinchus callorynchus in Valparaíso (central Chile). The main findings showed that C. callorynchus presented a narrow ellipse (E= 0.79; RC= 4.14; θ= 1.39), meanwhile D. chilensis, presented an ellipse with greater extension (E= 0.95; RC= 8,23; θ= -0.11), therefore a wide isotopic niche.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127964820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3406
Sandra Edith Olmeda-de la Fuente, J. Rodríguez-Castro, José Alberto Ramírez-de León, F. Caballero-Rico, Jorge Alejandro Rodríguez-Olmeda, Alfonso Correa-Sandoval
En la modelación de la relación longitud-peso (RLP) en tiburones siempre se ha ajustado el modelo potencial [modelo lineal (L) en versión logarítmica], nunca se ha aplicado la inferencia multimodelo (IMM) y siempre se ha asumido un crecimiento constante en todas las fases del desarrollo ontogénico. El tiburón martillo cabeza de pala (Sphyrna tiburo) del Golfo de México, no es la excepción. Mediante la modelación de la RLP en hembras (H), machos (M) y sexos combinados (C) de S. tiburo, y aplicando la IMM [modelos (L), cuadrático, cúbico, broken-stick (BS), dos segmentos (DS), BS y DS con transición logística entre segmentos] basada en la teoría de la información (TI), se probó la hipótesis de que el ajuste de L es insuficiente para describir la RLP en tiburones. Ningún modelo fue seleccionado con un peso de evidencia a su favor (wi%) mayor al 90%. La IMM evidenció un ajuste insuficiente en L (wi% = 0,86, 72,70 y 0,45%, en H, M y C, respectivamente), y significativo en el modelo promedio (wi%= 99,14, 27,30 y 99,55%, en H, M y C respectivamente); y demostró que el crecimiento cambia en función de la talla y presenta un marcado cambio morfológico en cierta talla específica, manifestado por los tres tipos de crecimiento registrados en H y C [alométrico negativo (CAN) y positivo (CAP), y crecimiento isométrico (CI)], y los dos en M (CI y CAP), cuyos cambios entre tipos de crecimiento fueron coincidentes con el cambio de dieta juvenil-adulto y el inicio de la madurez sexual, reportados por la literatura.
{"title":"Inferencia multimodelo aplicada a la relación longitud total-peso eviscerado en tiburones: El caso del tiburón martillo cabeza de pala Sphyrna tiburo","authors":"Sandra Edith Olmeda-de la Fuente, J. Rodríguez-Castro, José Alberto Ramírez-de León, F. Caballero-Rico, Jorge Alejandro Rodríguez-Olmeda, Alfonso Correa-Sandoval","doi":"10.22370/rbmo.2022.57.especial.3406","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3406","url":null,"abstract":"En la modelación de la relación longitud-peso (RLP) en tiburones siempre se ha ajustado el modelo potencial [modelo lineal (L) en versión logarítmica], nunca se ha aplicado la inferencia multimodelo (IMM) y siempre se ha asumido un crecimiento constante en todas las fases del desarrollo ontogénico. El tiburón martillo cabeza de pala (Sphyrna tiburo) del Golfo de México, no es la excepción. Mediante la modelación de la RLP en hembras (H), machos (M) y sexos combinados (C) de S. tiburo, y aplicando la IMM [modelos (L), cuadrático, cúbico, broken-stick (BS), dos segmentos (DS), BS y DS con transición logística entre segmentos] basada en la teoría de la información (TI), se probó la hipótesis de que el ajuste de L es insuficiente para describir la RLP en tiburones. Ningún modelo fue seleccionado con un peso de evidencia a su favor (wi%) mayor al 90%. La IMM evidenció un ajuste insuficiente en L (wi% = 0,86, 72,70 y 0,45%, en H, M y C, respectivamente), y significativo en el modelo promedio (wi%= 99,14, 27,30 y 99,55%, en H, M y C respectivamente); y demostró que el crecimiento cambia en función de la talla y presenta un marcado cambio morfológico en cierta talla específica, manifestado por los tres tipos de crecimiento registrados en H y C [alométrico negativo (CAN) y positivo (CAP), y crecimiento isométrico (CI)], y los dos en M (CI y CAP), cuyos cambios entre tipos de crecimiento fueron coincidentes con el cambio de dieta juvenil-adulto y el inicio de la madurez sexual, reportados por la literatura.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127261909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3333
Mary Cruz Prieto-Veloz, Marcos D. Calle-Morán, J. Tovar‐Ávila
Pseudobatos prahli is considered a low-medium fishing importance species in Ecuador, caught as target species and bycatch in both artisanal and industrial fisheries. Despite its importance, some basic aspects of its biology remain unknown, turning its study a priority. The aim of the present research was to describe for the first time the reproductive biology of P. prahli based on the analysis of individuals landed in the port of Santa Rosa, Province of Santa Elena, Ecuador. A total of 96 females and 165 males were sampled from January 2013 to January 2014. Females presented larger sizes (51-86 cm total length, TL) than males (51-78 cm TL), but no significant differences were found between the mean sizes of both sexes. The sexual proportion of landed individuals (0.6F:1M) suggested that free-living individuals segregate by sex, however, sex proportion of embryos was similar to the proportion 1F:1M. The number of mature individuals (64%) in the landings was larger than the immature ones (36%). Mean size at maturity (L50) of females (65.9 cm TL) was also slightly larger than that for males (61.8 cm TL). Size at birth was estimated at 22.5 cm TL. Ovarian fecundity ranged from 1 to10 and uterine fecundity from 1 to 6, and a positive but low linear relationship was found between both fecundity estimates and maternal size. Based on the comparison of some reproductive parameters, such as mean size at maturity, gestation period and fecundity, it can be concluded that P. prahli is one of the species with lowest biological productivity among the species of the same genus.
在厄瓜多尔，伪batos prahli被认为是一种中低渔业的重要物种，在手工和工业渔业中作为目标物种和副渔获物捕获。尽管它很重要，但其生物学的一些基本方面仍然未知，因此对它的研究成为当务之急。本研究旨在通过对厄瓜多尔圣埃琳娜省圣罗莎港上岸个体的分析，首次描述prahli的生殖生物学。2013年1月至2014年1月，共抽取96名女性和165名男性。雌虫体长(51 ~ 86 cm)大于雄虫体长(51 ~ 78 cm)，但雌雄平均体长差异不显著。上岸个体的性别比(0.6F:1M)表明自由生活个体是按性别隔离的，而胚胎的性别比与比例(1F:1M)相似。成年个体数量(64%)大于未成熟个体数量(36%)。雌性的平均成熟尺寸(L50) (65.9 cm TL)也略大于雄性(61.8 cm TL)。出生时大小估计为22.5 cm TL。卵巢繁殖力范围为1至10，子宫繁殖力范围为1至6，繁殖力估计值与母体大小之间呈低线性正相关。通过对平均成熟尺寸、妊娠期和繁殖力等生殖参数的比较，认为prahli是同属物种中生物生产力最低的物种之一。
{"title":"Reproductive biology of the Gorgona guitarfish Pseudobatos prahli in the central-eastern Pacific Ocean","authors":"Mary Cruz Prieto-Veloz, Marcos D. Calle-Morán, J. Tovar‐Ávila","doi":"10.22370/rbmo.2022.57.especial.3333","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3333","url":null,"abstract":"Pseudobatos prahli is considered a low-medium fishing importance species in Ecuador, caught as target species and bycatch in both artisanal and industrial fisheries. Despite its importance, some basic aspects of its biology remain unknown, turning its study a priority. The aim of the present research was to describe for the first time the reproductive biology of P. prahli based on the analysis of individuals landed in the port of Santa Rosa, Province of Santa Elena, Ecuador. A total of 96 females and 165 males were sampled from January 2013 to January 2014. Females presented larger sizes (51-86 cm total length, TL) than males (51-78 cm TL), but no significant differences were found between the mean sizes of both sexes. The sexual proportion of landed individuals (0.6F:1M) suggested that free-living individuals segregate by sex, however, sex proportion of embryos was similar to the proportion 1F:1M. The number of mature individuals (64%) in the landings was larger than the immature ones (36%). Mean size at maturity (L50) of females (65.9 cm TL) was also slightly larger than that for males (61.8 cm TL). Size at birth was estimated at 22.5 cm TL. Ovarian fecundity ranged from 1 to10 and uterine fecundity from 1 to 6, and a positive but low linear relationship was found between both fecundity estimates and maternal size. Based on the comparison of some reproductive parameters, such as mean size at maturity, gestation period and fecundity, it can be concluded that P. prahli is one of the species with lowest biological productivity among the species of the same genus.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130490105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3337
Keny Kanagusuku
Los dentículos dérmicos, también conocidos como escamas placoides, son estructuras que recubren el cuerpo de los tiburones, cuyas funciones son diversas e incluyen protección, defensa, bioluminiscencia e hidrodinámica, entre otras. Estas estructuras presentan una variedad de formas y tamaños y son utilizadas en estudios funcionales y taxonómicos en condrictios. A pesar de ello, son pocos los estudios que han reportado descripciones de dentículos dérmicos de diferentes regiones del cuerpo. El objetivo del presente estudio fue describir la morfología de los dentículos dérmicos del Tiburón dormilón de Galápagos Heterodontus quoyi, examinando muestras dérmicas de las áreas dorsal, ventral y lateral del cuerpo, además de la primera aleta dorsal. Para lograr este objetivo se recolectaron cuatro ejemplares adultos del Terminal Pesquero de Santa Rosa, Lambayeque, Perú. Los dentículos fueron fotografiados, medidos (largo y ancho), cuantificados (densidad) y descritos morfológicamente. Los resultados mostraron que los dentículos de las cuatro regiones presentaban diferencias, las cuales fueron: (1) densidad de los dentículos, (2) forma de la corona, (3) tamaño de la corona y (4) forma y número de crestas y cúspides en la corona. Estas variaciones observadas podrían ser útiles para futuros estudios de taxonomía en la identificación de especie y ecología como la relación entre su función y región del cuerpo.
{"title":"Morfología de los dentículos dérmicos del Tiburón dormilón de Galápagos Heterodontus quoyi (Elasmobranchii: Heterodontidae), una especie del Pacífico sudoriental","authors":"Keny Kanagusuku","doi":"10.22370/rbmo.2022.57.especial.3337","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3337","url":null,"abstract":"Los dentículos dérmicos, también conocidos como escamas placoides, son estructuras que recubren el cuerpo de los tiburones, cuyas funciones son diversas e incluyen protección, defensa, bioluminiscencia e hidrodinámica, entre otras. Estas estructuras presentan una variedad de formas y tamaños y son utilizadas en estudios funcionales y taxonómicos en condrictios. A pesar de ello, son pocos los estudios que han reportado descripciones de dentículos dérmicos de diferentes regiones del cuerpo. El objetivo del presente estudio fue describir la morfología de los dentículos dérmicos del Tiburón dormilón de Galápagos Heterodontus quoyi, examinando muestras dérmicas de las áreas dorsal, ventral y lateral del cuerpo, además de la primera aleta dorsal. Para lograr este objetivo se recolectaron cuatro ejemplares adultos del Terminal Pesquero de Santa Rosa, Lambayeque, Perú. Los dentículos fueron fotografiados, medidos (largo y ancho), cuantificados (densidad) y descritos morfológicamente. Los resultados mostraron que los dentículos de las cuatro regiones presentaban diferencias, las cuales fueron: (1) densidad de los dentículos, (2) forma de la corona, (3) tamaño de la corona y (4) forma y número de crestas y cúspides en la corona. Estas variaciones observadas podrían ser útiles para futuros estudios de taxonomía en la identificación de especie y ecología como la relación entre su función y región del cuerpo.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133800408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3419
Adriana Cevallos-Garcias, Sebastián Hernández, S. Raredon, D. Ebert, P. Kyne
The Sharpfin Houndshark, Triakis acutipinna, was described in 1968 from a specimen captured from Isla de la Plata, Ecuador. Since then, there have been no confirmed records of the species. To investigate the contemporary occurrence of this ‘lost shark’, a multi-pronged approach was undertaken. This included a literature review, development of an educational poster, and conducting a small number of informal fisher interviews in five coastal communities of Manabí province, Ecuador. Half of the fishers interviewed recognized T. acutipinna and reported its capture as recently as 2010-2015. Despite the preliminary nature of the present study, it suggests that the lost shark of Ecuador persists.
{"title":"Investigating the status of Ecuador’s lost shark, the Sharpfin Houndshark Triakis acutipinna","authors":"Adriana Cevallos-Garcias, Sebastián Hernández, S. Raredon, D. Ebert, P. Kyne","doi":"10.22370/rbmo.2022.57.especial.3419","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3419","url":null,"abstract":"The Sharpfin Houndshark, Triakis acutipinna, was described in 1968 from a specimen captured from Isla de la Plata, Ecuador. Since then, there have been no confirmed records of the species. To investigate the contemporary occurrence of this ‘lost shark’, a multi-pronged approach was undertaken. This included a literature review, development of an educational poster, and conducting a small number of informal fisher interviews in five coastal communities of Manabí province, Ecuador. Half of the fishers interviewed recognized T. acutipinna and reported its capture as recently as 2010-2015. Despite the preliminary nature of the present study, it suggests that the lost shark of Ecuador persists.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124692172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3416
V. Gabbanelli, D. M. Vazquez, S. M. Delpiani, J. M. Díaz de Astarloa, E. Mabragaña
Some of the characters used in description and identification keys for skates are mostly valid for adults, and may dramatically change through ontogeny. The lack of morphological description of the neonate stage prevents from identifying them in nature. Two neonates of Psammobatis lentiginosa born in captivity and three collected from the wild were used in this study. Morphometric differences were found in distance between orbits, distance between first gill slits and epichordal lobe. Colour pattern and spinulation presented differences as well. Observations on incubation period were taken. Hatching occurred 130 days after egg case collection.
{"title":"Description of neonate of the freckled sand skate Psammobatis lentiginosa and observations on incubation period","authors":"V. Gabbanelli, D. M. Vazquez, S. M. Delpiani, J. M. Díaz de Astarloa, E. Mabragaña","doi":"10.22370/rbmo.2022.57.especial.3416","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3416","url":null,"abstract":"Some of the characters used in description and identification keys for skates are mostly valid for adults, and may dramatically change through ontogeny. The lack of morphological description of the neonate stage prevents from identifying them in nature. Two neonates of Psammobatis lentiginosa born in captivity and three collected from the wild were used in this study. Morphometric differences were found in distance between orbits, distance between first gill slits and epichordal lobe. Colour pattern and spinulation presented differences as well. Observations on incubation period were taken. Hatching occurred 130 days after egg case collection.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125259547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3334
Angie Sánchez-Rea, Keny Kanagusuku
Algunas especies de batoideos poseen una cobertura dérmica con variaciones morfológicas utilizadas para taxonomía Esta investigación caracteriza morfológicamente las estructuras dérmicas de batoideos desembarcados en el litoral peruano, de acuerdo a las especies, zonas del cuerpo, etapa de desarrollo y sexo. Se analizaron 3 especies: Pseudobatos planiceps, Rostroraja velezi y Sympterygia brevicaudata, adquiridas de la pesca artesanal desde el norte al sur del país. Se identificaron tres tipos de estructuras: dentículos dérmicos, tubérculos cutáneos y espinas. Diversas estructuras dérmicas están presentes desde el nacimiento de los individuos. En Rajiformes, las diferencias entre sexos radicaron en la existencia de espinas malares y alares en machos. La presencia de poros en el lado ventral de la base de tubérculos y espinas de Rhinopristiformes, difiere de los Rajiformes, que presentan una cavidad donde se aloja la piel y se extiende hasta la base de la cavidad de la pulpa. Las diferencias en la morfología de estructuras dérmicas estuvieron relacionadas a las zonas del cuerpo evaluadas y a los patrones de cobertura dérmica entre especies. Además, estos resultados demuestran que la metodología utilizada en el presente estudio permite realizar una determinación a nivel de especie.
{"title":"Caracterización morfológica preliminar de las estructuras dérmicas de tres especies de batoideos (Chondrichthyes: Batoidea) en el litoral peruano","authors":"Angie Sánchez-Rea, Keny Kanagusuku","doi":"10.22370/rbmo.2022.57.especial.3334","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3334","url":null,"abstract":"Algunas especies de batoideos poseen una cobertura dérmica con variaciones morfológicas utilizadas para taxonomía Esta investigación caracteriza morfológicamente las estructuras dérmicas de batoideos desembarcados en el litoral peruano, de acuerdo a las especies, zonas del cuerpo, etapa de desarrollo y sexo. Se analizaron 3 especies: Pseudobatos planiceps, Rostroraja velezi y Sympterygia brevicaudata, adquiridas de la pesca artesanal desde el norte al sur del país. Se identificaron tres tipos de estructuras: dentículos dérmicos, tubérculos cutáneos y espinas. Diversas estructuras dérmicas están presentes desde el nacimiento de los individuos. En Rajiformes, las diferencias entre sexos radicaron en la existencia de espinas malares y alares en machos. La presencia de poros en el lado ventral de la base de tubérculos y espinas de Rhinopristiformes, difiere de los Rajiformes, que presentan una cavidad donde se aloja la piel y se extiende hasta la base de la cavidad de la pulpa. Las diferencias en la morfología de estructuras dérmicas estuvieron relacionadas a las zonas del cuerpo evaluadas y a los patrones de cobertura dérmica entre especies. Además, estos resultados demuestran que la metodología utilizada en el presente estudio permite realizar una determinación a nivel de especie.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127771878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3314
Mylene E. Seguel, Sebastián Sebastián Ramírez-Rivera, Francisco Concha, M. Espinoza, S. Hernández
After deposition, chondrichthyan egg capsules are frequently exposed to numerous threats that affect their survival. However, the ecological factors affecting the development and survival of embryos inside egg capsules remain unclear. The aims of this study was to quantify and describe two ecological factors that affect of the Shorttail fanskate Sympterygia brevicaudata egg capsules: predation and epibiosis. The egg capsules were collected (241) stranded from Coquimbo Bay's intertidal zone in northern Chile (29°57’S; 71°18’W and 71°19’W), and examined predation marks and epibiosis of these egg capsules at different stages of development. About 32.8% of the egg capsules presented evidence of predation marks, of which 48.1% had not yet hatched. Based on our findings, the shape and size of predation marks were different from those reported in the literature. Additionally, 78% of the egg capsules presented epibiosis, of which 21% had not yet hatched. Non-hatched egg capsules with more advanced stages of development (i.e., possessing open respiratory fissures) showed a higher probability to be predated and present epibiosis than those with earlier development (closed respiratory fissures). Ecological interactions, such as predation and the settlement of epibionts, may influence demographic aspects such as hatching success and survival rate, regulating the population sizes of S. brevicaudata during the embryonic phase.
{"title":"Predation and epibiosis on egg capsules of the Shorttail fanskate, Sympterygia brevicaudata","authors":"Mylene E. Seguel, Sebastián Sebastián Ramírez-Rivera, Francisco Concha, M. Espinoza, S. Hernández","doi":"10.22370/rbmo.2022.57.especial.3314","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3314","url":null,"abstract":"After deposition, chondrichthyan egg capsules are frequently exposed to numerous threats that affect their survival. However, the ecological factors affecting the development and survival of embryos inside egg capsules remain unclear. The aims of this study was to quantify and describe two ecological factors that affect of the Shorttail fanskate Sympterygia brevicaudata egg capsules: predation and epibiosis. The egg capsules were collected (241) stranded from Coquimbo Bay's intertidal zone in northern Chile (29°57’S; 71°18’W and 71°19’W), and examined predation marks and epibiosis of these egg capsules at different stages of development. About 32.8% of the egg capsules presented evidence of predation marks, of which 48.1% had not yet hatched. Based on our findings, the shape and size of predation marks were different from those reported in the literature. Additionally, 78% of the egg capsules presented epibiosis, of which 21% had not yet hatched. Non-hatched egg capsules with more advanced stages of development (i.e., possessing open respiratory fissures) showed a higher probability to be predated and present epibiosis than those with earlier development (closed respiratory fissures). Ecological interactions, such as predation and the settlement of epibionts, may influence demographic aspects such as hatching success and survival rate, regulating the population sizes of S. brevicaudata during the embryonic phase.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125129349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3411
Cecilia Gatica, Enzo Acuña
Bythaelurus canescens es un tiburón de profundidad capturado como fauna acompañante en la pesquería de crustáceos y la pesquería de la raya volantín Dipturus chilensis y el bacalao de profundidad Dissostichus eleginoides en la costa de Chile. El objetivo del presente estudio fue describir algunas características reproductivas y el desarrollo embrionario de B. canescens. Se obtuvieron 165 ejemplares (75 hembras y 90 machos) entre junio y diciembre del 2006. La proporción sexual hembra: macho fue de 0,8:1 con rangos de tallas de 23,7 cm a 76 cm de longitud total LT en hembras (promedio 43,95 ± DE 12,92 cm) y 23 cm a 68 cm LT en machos (44,65 ± 10,96 cm). El modo reproductivo de esta especie es la oviparía, conteniendo una cápsula por útero. Se registró un total de 94 cápsulas ovígeras, 24 en el útero de hembras grávidas y 70 recolectadas en el ambiente en la zona de Valparaíso, Chile, con un tamaño promedio de 60,7 ± 1,3 mm. De las cápsulas ovígeras recolectadas se extrajo un total de 18 embriones con tallas entre 1,4 y 8 cm LT (4,2 ± 1,8 cm), a partir de los cuales se describió siete estados de desarrollo embrionario según sus características morfológicas. Los embriones a la talla de 6 cm LT ya poseen características morfológicas de un adulto y a los 8 cm LT su saco vitelino está reducido a 1 cm de diámetro, señal que aproxima su eclosión.
canescens Bythaelurus canescens是一种深海鲨鱼，在智利海岸的甲壳类和棱纹鱼Dipturus chilensis和深海鳕鱼Dissostichus eleginoides渔业中作为伴生动物捕获。本研究的目的是描述canescens的生殖特征和胚胎发育。在2006年6月至12月期间，共采集了165只标本(75只雌性和90只雄性)。雌性与雄性的性别比例为0.8:1，雌性长23.7 cm ~ 76 cm(平均43.95±12.92 cm)，雄性长23 cm ~ 68 cm(平均44.65±10.96 cm)。这个物种的繁殖方式是卵泡，每个子宫包含一个胶囊。本研究的目的是评估在智利val帕拉索地区采集的10个卵囊中，有3个卵囊在妊娠期，1个在妊娠期，2个在妊娠期。从收集的卵囊中提取18个大小在1.4 ~ 8cm LT(4.2±1.8 cm)的胚胎，根据其形态特征描述了7个胚胎发育阶段。6厘米LT大小的胚胎已经具有成虫的形态特征，8厘米LT大小的卵黄囊直径缩小到1厘米，这是接近孵化的信号。
{"title":"Biología reproductiva y estados de desarrollo embrionario de la gata café Bythaelurus canescens (Chondrichthyes: Scyliorhinidae) del centro-norte de Chile","authors":"Cecilia Gatica, Enzo Acuña","doi":"10.22370/rbmo.2022.57.especial.3411","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3411","url":null,"abstract":"Bythaelurus canescens es un tiburón de profundidad capturado como fauna acompañante en la pesquería de crustáceos y la pesquería de la raya volantín Dipturus chilensis y el bacalao de profundidad Dissostichus eleginoides en la costa de Chile. El objetivo del presente estudio fue describir algunas características reproductivas y el desarrollo embrionario de B. canescens. Se obtuvieron 165 ejemplares (75 hembras y 90 machos) entre junio y diciembre del 2006. La proporción sexual hembra: macho fue de 0,8:1 con rangos de tallas de 23,7 cm a 76 cm de longitud total LT en hembras (promedio 43,95 ± DE 12,92 cm) y 23 cm a 68 cm LT en machos (44,65 ± 10,96 cm). El modo reproductivo de esta especie es la oviparía, conteniendo una cápsula por útero. Se registró un total de 94 cápsulas ovígeras, 24 en el útero de hembras grávidas y 70 recolectadas en el ambiente en la zona de Valparaíso, Chile, con un tamaño promedio de 60,7 ± 1,3 mm. De las cápsulas ovígeras recolectadas se extrajo un total de 18 embriones con tallas entre 1,4 y 8 cm LT (4,2 ± 1,8 cm), a partir de los cuales se describió siete estados de desarrollo embrionario según sus características morfológicas. Los embriones a la talla de 6 cm LT ya poseen características morfológicas de un adulto y a los 8 cm LT su saco vitelino está reducido a 1 cm de diámetro, señal que aproxima su eclosión.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131164828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-04DOI: 10.22370/rbmo.2022.57.especial.3407
Pamela Fuentes-Fuentes, E. Mabragaña, Francisco Concha
The genus Psammobatis is endemic to South America, and three of its species are sympatric along the Chilean coast. Their morphological similarity as well as the lack of type material of P. scobina, has made its taxonomic identification especially complex. The aim of this work is to allow for objective identification and comparisons of P. scobina, providing a new morphological characterization, incorporating both morphometric and meristic features for both sexes, and designating a Neotype. Morphometric and meristic data are presented separately for the Neotype, and for males and females to determine variability between sexes. Although there is overlap between some morphometric features of males and females, there are also some morphometric measures that differed between sexes among specimens of similar sizes, such as disc width, length of posterior pelvic lobe, preoral length, distance between fifth gill slits and distance from cloaca to second dorsal fin. Additionally, Principal Component Analysis and cluster analyses allowed to identify sexual dimorphism in specimens, with the most influential variables related to tail length. There are several unresolved issues regarding the taxonomy of this problematic genus, especially those regarding P. scobina and P. normani, which are sympatric in the southeastern Pacific. In addition to the analysis of skeletal structures and egg cases, an integrative comparative morphometric analysis, based on a recent standardized methodology with the inclusion of both morphological and molecular data, is still needed. The designation of a Neotype for objective comparative purposes, will allow such future study.
{"title":"Morphologic analysis and Neotype designation of the Raspthorn sandskate, Psammobatis scobina, from its type locality","authors":"Pamela Fuentes-Fuentes, E. Mabragaña, Francisco Concha","doi":"10.22370/rbmo.2022.57.especial.3407","DOIUrl":"https://doi.org/10.22370/rbmo.2022.57.especial.3407","url":null,"abstract":"The genus Psammobatis is endemic to South America, and three of its species are sympatric along the Chilean coast. Their morphological similarity as well as the lack of type material of P. scobina, has made its taxonomic identification especially complex. The aim of this work is to allow for objective identification and comparisons of P. scobina, providing a new morphological characterization, incorporating both morphometric and meristic features for both sexes, and designating a Neotype. Morphometric and meristic data are presented separately for the Neotype, and for males and females to determine variability between sexes. Although there is overlap between some morphometric features of males and females, there are also some morphometric measures that differed between sexes among specimens of similar sizes, such as disc width, length of posterior pelvic lobe, preoral length, distance between fifth gill slits and distance from cloaca to second dorsal fin. Additionally, Principal Component Analysis and cluster analyses allowed to identify sexual dimorphism in specimens, with the most influential variables related to tail length. There are several unresolved issues regarding the taxonomy of this problematic genus, especially those regarding P. scobina and P. normani, which are sympatric in the southeastern Pacific. In addition to the analysis of skeletal structures and egg cases, an integrative comparative morphometric analysis, based on a recent standardized methodology with the inclusion of both morphological and molecular data, is still needed. The designation of a Neotype for objective comparative purposes, will allow such future study.","PeriodicalId":347046,"journal":{"name":"Revista de Biología Marina y Oceanografía","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130082543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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