Soares I A, Lanfranchi A L, Luque J L, Haimovici M, Timi J T
Curso de Pós-Graduação em Ciências Veterinárias, Universidade Federal Rural do Rio de Janeiro, Seropédica, Rio de Janeiro, Brazil.
Laboratorio de Ictioparasitología, Instituto de Investigaciones Marinas y Costeras (IIMyC), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Funes 3350, (7600), Mar del Plata, Argentina.
Parasitol Res. 2018 Jun;117(6):1865-1875. doi: 10.1007/s00436-018-5878-7. Epub 2018 Apr 21.
Metazoan parasite assemblages of Pagrus pagrus inhabiting the southwestern Atlantic were analysed with the aim of identifying the existence of different stocks and to comparatively assess the value of different parasite guilds as indicators of zoogeographical regions. A total of 186 fish was examined. Samples were obtained from three Brazilian and one Argentine localities, distributed in three different biogeographic districts of the Argentine Zoogeographical Province. Pagrus pagrus harboured 26 metazoan parasite species distributed in three guilds, ectoparasites (10 species), long-lived larval endoparasites and short-lived gastrointestinal endoparasites (eight species each). Prevalence and abundance values of the former two guilds allowed analysing them comparatively to assess their value as biological indicators of both host population structure and zoogeography. Results of analyses on long-lived parasites evidenced the existence of three stocks, one in the regions of Rio de Janeiro and Sao Paulo, other in southern Brazil (Rio Grande do Sul) and a third in northern Argentina (Mar del Plata), responding to the differential environmental conditions characteristic of three zoogeographical ecoregions. Ectoparasite assemblages exhibited significant differences between all pairs of samples, including those considered as a single stock according to data on persistent parasites. Assemblages of long-lived larval parasites are considered as better indicators for stock assessment purposes than ectoparasites, whose population parameters were variable temporally and heterogeneous at small spatial scales. The distributional variability of persistent parasites of P. pagrus along large scales provides valuable information to help defining robust biogeographical patterns, applicable to stock identification and fishery management of this species.
对栖息在西南大西洋的条石鲷的后生动物寄生虫组合进行了分析，目的是确定不同种群的存在，并比较评估不同寄生虫类群作为动物地理区域指标的价值。共检查了186条鱼。样本取自巴西的三个地点和阿根廷的一个地点，分布在阿根廷动物地理省的三个不同生物地理区。条石鲷体内有26种后生动物寄生虫，分布在三个类群中，即外寄生虫（10种）、长寿幼虫内寄生虫和短寿胃肠道内寄生虫（各8种）。前两个类群的感染率和丰度值允许对它们进行比较分析，以评估它们作为宿主种群结构和动物地理学的生物学指标的价值。对长寿寄生虫的分析结果证明存在三个种群，一个在里约热内卢和圣保罗地区，另一个在巴西南部（南里奥格兰德），第三个在阿根廷北部（马德普拉塔），这与三个动物地理生态区的不同环境条件相对应。外寄生虫组合在所有样本对之间都表现出显著差异，包括根据持久性寄生虫数据被视为单一种群的样本对。与外寄生虫相比，长寿幼虫寄生虫组合被认为是更适合用于种群评估的指标，外寄生虫的种群参数在时间上是可变的，在小空间尺度上是异质的。条石鲷持久性寄生虫在大尺度上的分布变异性提供了有价值的信息，有助于定义适用于该物种种群识别和渔业管理的稳健生物地理模式。
