Evolutionary history of the reef fishAnisotremus interruptus(Perciformes: Haemulidae) throughout the Tropical Eastern Pacific

Abstract

The Tropical Eastern Pacific (TEP) is a dynamic coastal environment characterized by a complex system of oceanic processes and discontinuous rocky habitats. These features, in conjunction with the ecological and physiological characteristics of Anisotremus interruptus, might limit gene flow and shape the evolutionary history of the species. In this study, we investigate the evolutionary history of the reef fish A. interruptus (and its Atlantic sister species A. surinamensis) throughout its range in the TEP, using two mitochondrial (cox1 and cytb) and two nuclear markers (S7 and RAG1). We found three genetic groups of A. interruptus with recent divergence times from the Galapagos Archipelago, Revillagigedo Archipelago, the continental TEP, and A. surinamensis the sister specie from the Atlantic. The haplotype mtDNA networks show A. surinamensis in a central position with respect to Pacific genetic haplogroups, whereas nDNA networks show mixed haplotypes between the four genetic groups. In the species tree, A. surinamensis appears as the sister species of all the Pacific samples and the Galapagos Archipelago population emerges as a genetically distinctive group. The samples from the Revillagigedo Archipelago also constitute a genetic distinctive group, closely related to the continental samples. Continental individuals | 149 PALMERÍN-SERRANO Et AL.

Ictiofauna de la zona intermareal rocosa del Área de Conservación Guanacaste, Pacífico Norte de Costa Rica: diversidad y aspectos ecológicos y biogeográficos

“…Por otro lado, diferencias puntuales en la composición taxonómica a escala geográfica, reflejadas en los valores de similitud/disimilitud recuperados entre localidades contiguas a lo largo del PTO (y entre estas y otras porciones de la costa continental), como es el caso de las localidades en la costa Central Mexicana, El Salvador y aquellas situadas en Costa Rica y Colombia, podrían deberse, entre otras posibles razones, a la presencia de procesos o barreras vicariantes limitando el flujo e intercambio de especies evitando así una homogeneización de faunas (siendo esto más evidente en familias tales como Gobiesocidae, Gobiidae y Labrisomidae, entre otros, las cuales presentan varios endemismos locales). Al respecto, diversos estudios a nivel regional, utilizando técnicas moleculares (Palmerín-Serrano et al, 2020;Piñeros et al, 2019) y análisis cualitativos (presencia/ausencia de especies; e.g. Briggs & Bowen, 2012;Ekman, 1953;Hastings, 2000;Robertson & Cramer, 2009;), enfocados tanto en especies ícticas asociados a zonas intermareales como en aquellas asociados a zonas arrecifales en general, han demostrado repetidamente la importancia de barreras tales como las brechas arenosas de Sinaloa y Centroamericana, los giros oceánicos y patrones de corrientes marinas, incluyendo zonas de afloramientos costeros, entre otros, limitando o afectando la capacidad de dispersión (en estadios larvales y adultos) y colonización de nuevos ambientes de tales organismos, resultando así en una importante estructuración poblacional e incluso procesos de especiación a escala local.…”

Evolutionary history of the Aztec shiner Aztecula sallaei (Günther, 1868) (Teleostei: Cyprinidae): An endemic and monotypic species of Mexico

“…Lineage III is widespread, inhabiting the discrete biogeographic regions of the Upper Lerma, Middle Lerma, Cuitzeo, and Balsas (Zempoala Lakes) regions, as well as one population from Panuco, as explained above (Figures 1-4). Although the ACTB gene shows a mixture of haplotypes between regions of this lineage (Figure 2c), probably related to the common lineage sorting effect (Egge & Hagbo, 2015;Palmerín-Serrano et al, 2021), all markers showed a significant genetic structure among the currently recognized biogeographic regions (sensu Domínguez-Domínguez et al, 2006) (Figure 1, Tables 3 and 4). This structure is also evident in the cytb network and is partially supported by the S7 network (Figure 2).…”

Whole genome assembly and annotation of the King Angelfish (Holacanthus passer) gives insight into the evolution of marine fishes of the Tropical Eastern Pacific

“…However, only a few species have reported population expansions prior to the LGM [27]. On the contrary, in the TEP, most studies that have assessed the demographic history of marine organisms have found population expansions that precede the LGM [29][30][31][32] and few reporting population expansions in the last 20 Kya [32,33]. For instance, the goby, Elacatinus puncticulatus, and clingfish, Gobieosox adustus, experienced a population expansion around 170-130 Kya and 200-150 Kya, respectively [29,31].…”