Manuscrits sous presse

  • New records of abnormal pigmentation in fishes from the Atlantic European waters

    • Rafael Bañón
    • Daniel Cerdeira
    • Alejandro de Carlos
    Date d'acceptation: 31 mars 2020
    Statut: Sous presse/In press

    Résumé

    In early 2020, Spanish longliners recorded two new cases of anomalies in the coloration of marine fish in European Atlantic waters. A yellow-albino specimen of Merluccius merluccius of 616 mm TL was caught in the south of Ireland whereas a xanthochromic specimen of Raja montagui of 658 mm TL was caught in the north of Spain. The identification of the specimens was made on the basis of morphological characters and confirmed by comparing their DNA barcodes with those deposited in the GenBank and BOLD repositories. A description of the anomalous coloration compared to normal coloration was also carried out.

  • New distributional records of three deepwater cardinalfishes Epigonus angustifrons, E. denticulatus, and E. exodon(Perciformes: Epigonidae) in the South Indian Ocean

    • Makoto Okamoto
    • Wei-Jen Chen
    • Hiroyuki Motomura
    Date d'acceptation: 06 avril 2020
    Statut: Sous presse/In press

    Résumé

    Two specimens (189.7–210.3 mm in standard length: SL) of Epigonus angustifrons Abramov and Manilo, 1987 and two specimens (120.2–138.6 mm SL) of E. denticulatus Dieuzeide, 1950 (Epigonidae) were collected from the central South Indian Ocean. Also, a single specimen (131.0 mm SL) of E. exodon Okamoto and Motomura, 2012 was collected offMayotte, Comoros Archipelago, western South Indian Ocean. These specimens represent the first records of three species from the areas. The present specimen of E. exodon is the third specimen since the original description and new morphological data for the species based on this additional specimen was provided.

  • First Pacific record of Priolepis goldshmidtae (Gobiidae), previously regarded as a Red Sea endemic

    • Fujiwara Kyoji
    • Suzuki Toshiyuki
    • Motomura Hiroyuki
    Date d'acceptation: 18 mars 2020
    Statut: Sous presse/In press

    Résumé

    A single specimen (17.0 mm in standard length) of Priolepis goldshmidtae Goren & Baranes, 1995, collected at 120 m depth off Okinawa Island, southern Japan, represents the first record of the species from the Pacific Ocean. The species was previously known only from the original description, being regarded as an endemic Red Sea species.

  • Junior synonymy of Mulloides armatus and intraspecific comparisons of the yellowstripe goatfish Mulloidichthys flavolineatus (Mullidae) using a comprehensive alpha-taxonomy approach

    • Uiblein Franz
    • Gouws Gavin
    • Johnson Jeffrey
    • Lobel Phillip
    • Shaheen Shaker
    Date d'acceptation: 19 mars 2020
    Statut: Sous presse/In press

    Résumé

    The main objectives of this study were to clarify the taxonomic status of Mulloides armatus, listed as incertae sedis in current taxonomic literature, and to examine the extent of phenotypic differentiation among subspecies and populations of the yellowstripe goatfish Mulloidichthys flavolineatus (Mullidae) in the Indo-Pacific. In total, 53 quantitative morphometric and meristic characters and the visual detectability of the first dorsal-fin spine were gathered from 116 specimens split according to size into juveniles and adults. In addition, fresh colour imagery was studied. The Mulloides armatus holotype, which is broken into two pieces, could be identified as M. flavolineatus after reconstruction of standard length and detailed comparisons involving specimens from nearby the assumed type locality in the Southwestern (SW) Pacific. Then, the recently described subspecies M.f. flavicaudus of the Red Sea and populations of the nominal subspecies M.f. flavolineatus from the Indian Ocean and the Pacific, with additional subdivision into four smaller populations (SW Pacific, Wake Atoll, Hawaiian Archipelago and remaining Pacific), were studied by direct comparisons and uni- and multivariate statistical methods. For the first time marked size differences (i.e. allometry) in morphometric characters in M. flavolineatus were documented. Mulloidichthys f. flavicaudus overlaps in all characters, singly and in combination, and under consideration of a whitish-grey vs. yellow caudal-fin colour (a diagnostic character used in the original description) with M.f. flavolineatus. These results do not support the elevation to species level in a recently published list of Red Sea fish species. Our data suggest a well-differentiated population in agreement with genetic data presented in the original description of Mulloidichthys f. flavicaudus. Statistical differences in morphometric and meristic characters were also found between the Indian Ocean and Pacific populations of M.f. flavolineatus, though at a much lower degree than between the two subspecies. Interestingly, considerable variation occurs within the Pacific populations with three specimens from Wake Atoll being distinct from nearly all other conspecifics, in having larger heads and eyes and longer barbels and pectoral fins. Therefore, we stress the significance of intraspecific differentiation in populations from remote oceanic island and atoll areas and the need to collect more data. Important is also to use results on intraspecific regional or local differentiation in widely distributed species such as M. flavolineatus in fisheries management and conservation efforts at biologically relevant scales, as well as adopting appropriate common names to facilitate the information exchange with local stakeholders.

  • A new species of Sicyopterus (Teleostei: Gobioidei: Sicydiinae) from Papua New Guinea

    • Lord Clara
    • Keith Philippe
    • Causse Romain
    • Amick Peter
    Date d'acceptation: 19 décembre 2019
    Statut: Sous presse/In press

    Résumé

    A new species of Sicyopterus, a freshwater goby, is described from streams of Papua New Guinea on the island of West New Britain. It differs from other species belonging to the genus by a combination of characters including the upper lip morphology, a second dorsal fin with one spine and 10 segmented rays, the scales in the lateral, predorsal, transverse back, transverse forward and zigzag series, and live colours with courting males having a coal black body with a pearl white necklace.

  • Effects of dams on demographic structures of amphidromous fish and crustacean species in Caribbean rivers

    • Frotté Lou
    • Cordonnier Sébastien
    • Bezault Etienne
    • Monti Dominique
    Date d'acceptation: 05 mars 2020
    Statut: Sous presse/In press

    Résumé

    Caribbean island rivers are the home to migratory indigenous macro-fauna. Concurrently, they also serve as the main source of freshwater for human consumption. This production of drinking water involves the construction of a large number of structures across the riverbed, which can slow or even stop the migration of aquatic species. The resident river macro-fauna is composed of crustacean and fish species that all have a diadromous and mostly amphidromous life cycle, involving pro-larval drift downstream towards the sea, marine larval dispersal, followed by an upstream river migration to complete their growth and reproduction cycle. Our study compares, across three rivers on the island of Guadeloupe, the recruitment of five crustacean species and two fish species in the mouths of these rivers with species demographic distributions on either side of the major water withdrawal structure built along these rivers. Post-larval recruitment events were multi-specific, discrete over time and their amplitude varied depending on the river. We show differential biological porosity of each obstacle according to species, revealing different specific crossing abilities. Our results also suggested that the impacts were not directly related to the height of the structure but that external, hydrological and environmental, conditions are involved. These achievements can be translated into operational measures such as the maintaining and monitoring of reserved minimal flows that are adapted to passways, as well as the setting up of protective measures for the natural environment.

  • Spatio-Temporal Patterns in Marine Fish Communities Across Scales: using an Autoregressive Spatial Temporal Clustering Model. A study of fish and cephalopods of the Eastern English Channel

    • Katyana Vertpré
    • Trancart Thomas
    • Feunteun Eric
    Date d'acceptation: 06 février 2020
    Statut: Sous presse/In press

    Résumé

    In marine ecology, spatial and temporal fish community structure is important to understand ecosystem’s responses to anthropogenic and environmental factors. Although spatial distribution patterns and fish time series of abundance have been studied in the past, little research has addressed the impact of spatial scale on mapping spatio-temporal patterns. To achieve this goal, the first step is to develop a method describing spatio-temporal communities statistically. At three spatial resolutions, from 1043 km2 to 522 km2, we compared the output of a new framework, the Autoregressive Spatial Temporal Clustering analysis (ASTEC). ASTEC combines a zero-inflated Poisson model with latent predictors alongside a hierarchical clustering analysis using multiscale bootstrap resampling. It estimates the spatial and spatio-temporal communities formed by 16 species in the Eastern English Channel using 20 years of data from the Channel Ground Fishery Survey. Community structure was strongly dependent upon the spatial scale of study. From larger to finer scale, some rare correlations got gradually stronger, but most correlations remained as strong or got weaker. However, integrating temporality in spatial studies defined a stable composition and richness community structure regardless of spatial scales. Moreover, combining a spatial and spatio-temporal approach highlighted cluster composition shifts over time. It shows that small scale data should be used for studies on spatial connectivity and meta-community, whereas large scale should are appropriate for biogeographic studies. Moreover, the impact of scale can be disregarded when adding temporal variations to the study of ecosystem spatial structure. A combined spatial and spatio-temporal approach defines community dynamics, and may help management and conservation efforts facing climate change and anthropogenic pressures.

     

  • The complete mitochondrial genome of Thymallus thymallus (Linnaeus, 1758) (Actinopterygii, Salmonidae) obtained by long range PCRs and double multiplexing

    • Denys Gaël
    • Secci-Petretto Giulia
    • Gomes-dos-Santos André
    Date d'acceptation: 06 janvier 2020
    Statut: Sous presse/In press

    Résumé

    The complete mitochondrial DNA sequence of Thymallus thymallus (Actinopterygii, Salmonidae) from a museum voucher caught in the Ain River (Rhône drainage) was sequenced. The sequence was 16 660 bp in length, consisted of 13 protein-coding genes, 22 transfer RNA genes including 2 tRNA-Leu and 2 tRNA-Ser, 2 ribosomic RNA genes and the control region. Intergenic space and overlapping sequences were found. The base composition of the whole mtDNA was 27.5% A, 27.9% T, 27.1% C and 17.5% G. This mitogenome was sequenced for less than 20 euros.