Multilocus data reveal cryptic species in the Atlantic seabob shrimp Xiphopenaeus kroyeri (Crustacea: Decapoda)

2019 ◽  
Vol 127 (4) ◽  
pp. 847-862 ◽  
Author(s):  
Thomas R H Kerkhove ◽  
Jens Boyen ◽  
Annelies De Backer ◽  
Jan H Mol ◽  
Filip A M Volckaert ◽  
...  

Abstract The recognition of cryptic biodiversity provides valuable insights for the management of exploited species. The Atlantic seabob shrimp (Xiphopenaeus kroyeri) is a commercially important fishery resource in the Guianan ecoregion, South America. Previous research in Brazil suggested the presence of cryptic species within the genus. Here, we confirm this presence and delimit the species by applying a multilocus approach based on two mitochondrial (COI and cytb) and two nuclear (PEPCK and NaK) genes. Species boundaries were tested using BPP, GMYC and bPTP delimitation algorithms. These analyses provided strong support for three clades within the genus Xiphopenaeus, including one undescribed clade, which occurs sympatrically with X. kroyeri in the Western Atlantic. Unexpectedly, this undescribed clade is more closely related to the Pacific Xiphopenaeus riveti than to their Atlantic congener. Our DNA-based species delimitation was further supported by new ecological information on habitat and morphology (colour). We also expand the known distribution range of the cryptic species, currently restricted to Brazil, to include French Guiana, Suriname and Colombia. Our findings have important consequences for the management of the species, in terms of both biodiversity management and fisheries management.

Author(s):  
Luz M. Mejía Ladino ◽  
Arturo Acero P. ◽  
Luz S. Mejía M. ◽  
Andrea Polanco F.

The family Antennariidae is represented by two genera (Antennarius and Histrio) and seven species in the Western Atlantic, and by two genera (Antennarius and Antennatus) and five species in the Eastern Pacific. All the species are known from Colombian waters, with the exception of Antenanrius coccineus. In this study we review the family Antenariidae in Colombia, based on the examination of 51 specimens. Antennarius radiosus is first recorded from the Colombian Caribbean, based on two specimens collected with trawls at 20 m depth in Buritaca (Magdalena) and Isla Fuerte (Córdoba). Antennarius radiosus, Antennarius bermudensis, Antennarius multiocellatus, Antennarius ocellatus and Antennarius pauciradiatus are restricted to the Western Atlantic. The most common species found in Colombian seas are Antennarius striatus in the Caribbean and Antennarius avalonis in the Pacific. Histrio histrio is the only species with an almost circumglobal distribution. A key to identify antenariid fishes from Colombia is provided.


2020 ◽  
Vol 33 (2) ◽  
pp. 497-510 ◽  
Author(s):  
Mio Terada ◽  
Shoshiro Minobe ◽  
Curtis Deutsch

AbstractThe future change in equatorial upwelling between 1971–2000 and 2071–2100 is investigated using data from 24 coupled climate models. The multimodel ensemble (MME) mean exhibits substantial equatorial upwelling decrease in the eastern Pacific and weaker decrease in the western Atlantic Ocean. The MME mean of upwelling change and intermodel variation of that are decomposed into distinct isopycnal and diapycnal components. In the Pacific, the diapycnal upwelling decreases near the surface, associated with a weakened Ekman pumping. The isopycnal upwelling decreases at depths of 75–200 m around the core of the Equatorial Undercurrent (EUC) due to flattening of the density layer in which it flows. Both the weakened Ekman pumping and the EUC flattening are induced by the locally weakened trade wind over the eastern Pacific basin. In the equatorial Atlantic, both the change in MME mean and the intermodel variation of upwellings are significantly related to the weakened trade wind and enhanced stratification, although these drivers are not independent. The results for the Pacific Ocean imply that future reduction in upwelling may have impacts at different depths by different mechanisms. In particular, the rapid warming of sea surface temperature in the eastern Pacific basin may be mainly caused by the near-surface diapycnal upwelling reduction rather than isopycnal upwelling reduction associated EUC flattening, which is important at deeper levels.


Zootaxa ◽  
2011 ◽  
Vol 2966 (1) ◽  
pp. 37 ◽  
Author(s):  
MILLICENT D. SANCIANGCO ◽  
LUIZ A. ROCHA ◽  
KENT E. CARPENTER

We infer a phylogeny of haemulid genera using mitochondrial COI and Cyt b genes and nuclear RAG1, SH3PX3, and Plagl2 genes from 56 haemulid species representing 18 genera of the expanded haemulids (including the former inermiids) and ten outgroup species. Results from maximum parsimony, maximum likelihood, and Bayesian analyses show strong support for a monophyletic Haemulidae with the inclusion of Emmelichthyops atlanticus. The former inermiids did not form a clade indicating that the highly protrusible upper jaw specialization to planktivory evolved more than once within Haemulidae. The subfamilies Haemulinae and Plectorhinchinae, currently diagnosed by eight morphological characters, most notably the number of chin pores and the origin of the retractor dorsalis, are also recovered from these analyses with the Haemulinae sister to the Plectorhinchinae. Plectorhinchus is monophyletic only with the inclusion of Diagramma. Within the Haemulinae, Pomadasys and Conodon are polyphyletic. In addition, Anisotremus is monophyletic only with the inclusion of Genyatremus and Conodon nobilis, and Haemulon is monophyletic only with the inclusion of Xenistius. These results suggest that further morphological and molecular studies are needed to revise the limits of several haemulid genera.


2020 ◽  
Vol 63 (3) ◽  
pp. 241-245 ◽  
Author(s):  
Marion A. Wolf ◽  
Alessandro Buosi ◽  
Adriano Sfriso

AbstractIn this study we report the first finding of the red alga Acanthosiphonia echinata in the Mediterranean Sea. Specimens were identified using the DNA barcoding method and, in particular, the plastidial rbcL and the mitochondrial COI-5P markers. This species has been considered to be restricted to the western Atlantic and was reported in blooms from North Carolina to South Carolina. In 2015 the introduction of this species in Southeast Asia (Indonesia) was reported. Probably this taxon was introduced in the Mediterranean Sea from Indonesian populations associated with seaweed farming activities or hull fouling, via the western Atlantic-Mediterranean-Indonesia ship route.


2019 ◽  
Vol 55 (3) ◽  
pp. 676-687 ◽  
Author(s):  
Fabio Nauer ◽  
Carlos Frederico Deluqui Gurgel ◽  
Lígia Maria Ayres‐Ostrock ◽  
Estela Maria Plastino ◽  
Mariana Cabral Oliveira

Zootaxa ◽  
2017 ◽  
Vol 4277 (2) ◽  
pp. 237 ◽  
Author(s):  
RYO NAKAYAMA ◽  
TAKENORI SASAKI ◽  
TOMOYUKI NAKANO

A group of small lottiid species in Japan, the Lottia kogamogai complex, was phylogenetically analyzed based on the mitochondrial COI gene. As a result, L. kogamogai is subdivided into two geographic clades. Lottia kogamogai s.s. is limited to southern temperate Japan. The northern population formerly considered an intraspecific variation of the species is shown to be a distinct new species, here described as Lottia goshimai n. sp. The new species is distinguishable from L. kogamogai not only genetically, but in radular morphology and shell sculpture. 


2010 ◽  
Vol 100 (3) ◽  
pp. 359-366 ◽  
Author(s):  
J. Xu ◽  
P.J. De Barro ◽  
S.S. Liu

AbstractThe worldwide distribution and extensive genetic diversity of the whitefly Bemisia tabaci has long been recognized. However, whether B. tabaci is a complex species or a species complex has been a subject of debate. Recent phylogenetic analyses suggest that B. tabaci is a cryptic species complex composed of at least 24 morphologically indistinguishable species. Here, we conducted crossing experiments and demonstrated reproductive incompatibility among three of the 24 putative species. Our data and those of previously reported crossing experiments among various putative species of B. tabaci were collated to reveal the pattern of reproductive isolation. The combined results provide strong support to the proposition that B. tabaci is a cryptic species complex.


Food Control ◽  
2014 ◽  
Vol 38 ◽  
pp. 116-123 ◽  
Author(s):  
Ivana Veneza ◽  
Bruna Felipe ◽  
Joiciane Oliveira ◽  
Raimundo Silva ◽  
Iracilda Sampaio ◽  
...  

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