Biogeographic and latitudinal patterns of demersal fishes in the Mexican Pacific

2014 ◽  
Vol 95 (2) ◽  
pp. 411-422 ◽  
Author(s):  
Deivis S. Palacios-Salgado ◽  
V.H. Cruz-Escalona ◽  
M.J. Zetina-Rejón ◽  
F. Arreguín-Sánchez ◽  
J.T. Nieto-Navarro
Keyword(s):  
Species Richness ◽  
Gulf Of California ◽  
Taxonomic Diversity ◽  
Wide Distribution ◽  
Taxonomic Composition ◽  
Mexican Pacific ◽  
Distribution Ranges ◽  
Tropical Conditions ◽  
Gulf Of Tehuantepec ◽  
Latitudinal Patterns

Latitudinal patterns of composition, biogeographic affinity and indicators of taxonomic diversity are described for the by-catch fish community in five typical shrimping areas in the Mexican Pacific (Upper Gulf of California, Sinaloa-Nayarit, Jalisco-Colima, Michoacán-Guerrero and Gulf of Tehuantepec). The taxonomic composition included two classes, 20 orders, 65 families, 147 genera and 292 species. The family Sciaenidae was the best represented with 33 species, whereas at the genus level, Anchoa was represented with eight species. A high percentage of the species showed wide distribution ranges (30.2% for Cortez Province ~ Panamic Province; 21.3% for San Diego Province ~ Panamic Province); nevertheless, each ecosystem included a characteristic combination of species, apparently related to the physiographic conditions of the ecosystems. Species richness showed a pronounced decrease from the Upper Gulf of California, which has warm-temperate features, to the Gulf of Tehuantepec, which has tropical conditions; this is an opposite trend to that observed in the taxonomic diversity indicators, suggesting that a taxonomic redundancy was present in tropical areas and higher taxonomic diversity was present in the Upper Gulf of California, despite the lower species richness. This is explained by the prevailing environmental conditions and isolation processes generated during the formation of the Gulf of California.

Spatial and bathymetric trends in composition and taxonomic diversity of Polychaeta (Annelida) assemblages from the deep Southern Gulf of California

2021 ◽  
Author(s):  
Araceli Jaquelín Mercado-Santiago ◽  
Pablo Hernández-Alcántara ◽  
Vivianne Solís-Weiss
Keyword(s):  
Species Richness ◽  
Gulf Of California ◽  
Taxonomic Diversity ◽  
Assemblage Structure ◽  
Geographic Position ◽  
Far Eastern

The deepsea fauna from the southern Gulf of California is currently poorly known, with only 193 species reported to date. The aim of this study was to analyze the composition, density, species richness, and taxonomic diversity (Δ) of the deepsea polychaetes of this region. Fifteen stations (238–2900 m depth) were sampled in 2012 and 2013. Eighty-four species from 58 genera and 26 families were identified. Density ranged from 4.76 to 42.86 ind 0.1m−2 and was not significantly correlated with depth; species richness ranged from 2 to 17 species per station, the lowest (2–6 species) occurring between depths of 651 and 915 m. Four assemblages were identified associated with depth (RANOSIM = 0.43, P = 0.002) and geographic position (RANOSIM = 0.56, P = 0.001): Prionospio elhersi–Subadyte mexicana–Syllis alternata (<350 m depth) and Aricidea sp. A–Ninoe jessicae (600–1000 m) in the western gulf; Onuphis similis–Aricidea (Acmira) simplex (1300–1600 m) and Aglaophamus paucilamellata–Sthenolepis spargens (>1200 m) in the middle gulf; stations 14A and 2A, sharing only their position at the far eastern gulf, remained isolated from any other assemblage. The highest diversity was found at 1300–1600 m (Δ = 86.1) and at >2000 m (Δ = 83–98) but decreased to Δ = 61.85 at 600–1000 m. The assemblage structure based on genera and family levels were similar to those based on species (Rho > 0.6), suggesting that either of the former two could be suitable surrogates for monitoring changes at the studied depths.

scholarly journals ATLAS DE IDENTIFICACIÓN DE LARVAS DE PECES DE LA SUBDIVISIÓN ELOPOMORPHA DEL PACÍFICO MEXICANO

2013 ◽  
Vol 28 (2) ◽  
pp. 7
Author(s):  
E. A. González -Navarro ◽  
R. J. Saldierna -Martínez ◽  
G. Aceves -Medina ◽  
S. P. A. Jiménez -Rosenberg
Keyword(s):  
Gulf Of California ◽  
Baja California ◽  
Fish Larvae ◽  
Central Pacific ◽  
The West ◽  
La Paz ◽  
Mexican Pacific ◽  
Larval Fishes ◽  
Gulf Of Tehuantepec ◽  
Leptocephalus Larvae

El objetivo principal de este trabajo es presentar la composición de especies de la Subdivisión Elopomorpha, contenida en la colección científica de las larvas de peces del Pacífico Mexicano, que pertenece al Centro Interdisciplinario de Ciencias Marinas del Instituto Politécnico Nacional. Presentamos fichas descriptivas de 23 especies recolectadas con redes de arrastre de zooplancton en el Golfo de California, la Bahía de La Paz, la costa occidental de Baja California, el Pacífico Central Mexicano y el Golfo de Tehuantepec, incluyendo larvas pertenecientes a las familias Elopidae, Albulidae, Muraenidae, Ophichthyidae, Congridae y Nettastomatidae. Las descripciones proporcionan patrones morfológicos, merísticos y la pigmentación que permiten identificar las larvas leptocéfalas en nuestra colección. Identification Atlas of larval fishes of the Subdivision Elopomorpha from the Mexican Pacific The main objective of this work is to present the species composition of the Subdivision Elopomorpha, housed in the Scientific Collection of Fish larvae from the Mexican Pacific, at the Centro Interdisciplinario de Ciencias Marinas of the Instituto Politécnico Nacional. We provide descriptive cards for 23 species collected with zooplankton trawls throughout the Gulf of California, La Paz bay, the west coast of Baja California, the Mexican Central Pacific and the Gulf of Tehuantepec. Larvae belonging to the families Elopidae, Albulidae, Muraenidae, Ophichthyidae, Congridae and Nettastomatidae are included. The descriptions provide morphological, meristic and pigmentation patterns that allow to identify the leptocephalus larvae in our collection.

Five new species of cotylean flatworms (Platyhelminthes: Polycladida: Cotylea) from Oaxaca, southern Mexican Pacific

Zootaxa ◽  
2020 ◽  
Vol 4819 (1) ◽  
pp. 49-83
Author(s):  
MARIELA RAMOS-SÁNCHEZ ◽  
JULIANA BAHIA ◽  
J. ROLANDO BASTIDA-ZAVALA
Keyword(s):  
New Species ◽  
Gulf Of California ◽  
First Record ◽  
Disjunct Distribution ◽  
Taxonomic Identification ◽  
Tropical Eastern Pacific ◽  
Mexican Pacific ◽  
The Family ◽  
Gulf Of Tehuantepec ◽  
Whole Mounts

The flatworms of the suborder Cotylea live in diverse marine substrates such as rocks, seaweed and sand or in association with corals. In the Mexican Pacific, particularly on the coast of Oaxaca, knowledge about cotyleans is scarce, with only one record of the genus Pseudoceros. The aim of this work was to describe the cotylean species present in the area. A total of 48 specimens were collected, fixed, mounted in whole mounts or histological sagittal and frontal histological sections of the reproductive systems. These were examined for taxonomic identification, determining five new species of four genera: Boninia oaxaquensis sp. nov., Pericelis sigmeri sp. nov., Pericelis nazahui sp. nov., Pseudoceros bicuti sp. nov. and Thysanozoon estacahuitensis sp. nov. The present study establishes the first record of the genus Boninia and the family Boniniidae for the Tropical Eastern Pacific. It also confirms the presence of the genus Pseudoceros on the coast of Oaxaca, and break the disjunct distribution of this genus (from Gulf of California to Gulf of Tehuantepec), as well as the genus Pericelis (from Canada to Galapagos Islands) and Thysanozoon (from Chile to Gulf of California).

scholarly journals Geographical patterns in species richness of the benthic polychaetes in the continental shelf of the Gulf of California, Mexican Pacific

2013 ◽  
Vol 67 (3) ◽  
pp. 579-589 ◽  
Author(s):  
Pablo Hernández-Alcántara ◽  
David Alberto Salas-de León ◽  
Vivianne Solís-Weiss ◽  
María Adela Monreal-Gómez
Keyword(s):  
Species Richness ◽  
Continental Shelf ◽  
Gulf Of California ◽  
Mexican Pacific ◽  
Geographical Patterns

scholarly journals Three new species of the sea fan genus Leptogorgia (Octocorallia, Gorgoniidae) from the Gulf of California, Mexico

ZooKeys ◽  
2021 ◽  
Vol 1017 ◽  
pp. 1-20
Author(s):  
Osvaldo Hernández ◽  
Jaime Gomez-Gutiérrez ◽  
Carlos Sánchez
Keyword(s):  
Gulf Of California ◽  
Scuba Diving ◽  
Northern Region ◽  
Mexican Pacific ◽  
California Coast ◽  
Rocky Reefs ◽  
San Pedro ◽  
Distribution Ranges ◽  
Three New Species ◽  
Sea Fan

Three new sea fan species of Leptogorgia were discovered during multiple scuba diving expeditions along the Gulf of California coast and islands. Leptogorgia iridissp. nov. is distributed in the southern region of the gulf (Mexican Province), inhabiting tropical rocky reefs of the Islas Marías Archipelago (Nayarit) and Bahía Banderas (Jalisco). This species has small colonies (&lt; 7 cm height) with at least five clearly distinct chromotypes. Leptogorgia martirensissp. nov. was found exclusively on the rocky reefs of San Pedro Mártir and San Esteban Islands located in the northern region of the Gulf of California (northern region of Cortez Province). Leptogorgia enricisp. nov. is distributed from the south to the northern region of the Gulf of California (Cortez Province), inhabiting substrates of rocky reefs, sandy and pebbly sea floors. Comprehensive ecological diving expeditions to identify and classify octocorals in the Mexican Pacific (1995–2019) indicate that L. iridissp. nov. and L. martirensissp. nov. are likely to be micro-endemics and L. enricisp. nov. is endemic to the Gulf of California, which defines their currently known biogeographic distribution ranges.

Linking fish and crustacean taxonomic composition with seasonal contrasts in the soft-bottom intertidal zone

2020 ◽  
Author(s):  
M. A. Gondal ◽  
S. Iqbal ◽  
U. Atique ◽  
N. U. Saher ◽  
N. A. Qureshi ◽  
...  
Keyword(s):  
Species Richness ◽  
Water Temperature ◽  
Fish Species ◽  
Diversity Index ◽  
Taxonomic Composition ◽  
Primary Objective ◽  
Negative Effect ◽  
Fish Species Composition ◽  
One Year ◽  
Sw Monsoon

Abstract The primary objective of this study was to investigate the seasonal fish and crustacean variations concerning taxonomic composition, species richness, and diversity in sandy beach habitat. For this purpose, we investigated the Sonmiani Hor lagoon area during four distinct seasons, i.e., northeast (NE) monsoon, pre-monsoon, south-west (SW) monsoon, and post-monsoon for one year. During each haul, the net was pulled about 100m along the beach in 0.5m depth. The results showed a strong linear correlation between the diversity index and equitability in fishes (r = 0.978). The diversity index was strong negatively correlated with the abundance and biomass (r = -0.978, -0.972, respectively). The physical attributes like sea surface water temperature and salinity showed a strong negative effect on species assemblages (r = -0.981 and -0.943, respectively). The mean air and water temperature illustrated approximately 3°C difference during NE and pre-monsoon seasons. However, salinity, pH, and electrical conductivity did not show any significant seasonal variabilities. Under the ecological indices, the fish species displayed higher diversity (H’ = 3.19) during SW monsoon, whereas the lowest diversity was observed during pre-monsoon (H’ = 1.58). The equitability and species richness, however, remained more noticeable during SW monsoon (J’ = 0.81). The total number of individuals of fish and crustaceans reached 4799 with 3813 fish individuals and 986 individuals of crustaceans. A total of 27 families of fish while five crustacean families comprising of 30 genera and 38 fish species while ten genera and 17 species of crustaceans were recorded. Liza subviridis displayed the highest abundance among the sampled fish species. In conclusion, fish species constituted a significant part of the coastal fauna in the study area. The seasonal variations displayed distinct variations in fish species composition and diversity.

scholarly journals Do carabids (Coleoptera: Carabidae) and chironomids (Diptera: Chironomidae) exhibit similar diversity and distributional patterns along a spatio-temporal gradient on a glacier foreland?

2018 ◽  
Author(s):  
Mauro Gobbi ◽  
Valeria Lencioni
Keyword(s):  
Species Richness ◽  
Species Turnover ◽  
Aquatic Insect ◽  
Taxonomic Diversity ◽  
Carabid Beetles ◽  
Species Assemblages ◽  
Glacier Foreland ◽  
Distributional Patterns ◽  
Glacier Front ◽  
Spatio Temporal

Carabid beetles and chironomid midges are two dominant cold-adapted taxa, respectively on glacier forefiel terrains and in glacial-stream rivers. Although their sensitivity to high altitude climate warming is well known, no studies compare the species assemblages exhibited in glacial systems. Our study compares diversity and distributional patterns of carabids and chironomids in the foreland of the receding Amola glacier in central-eastern Italian Alps. Carabids were sampled by pitfall traps; chironomids by kick sampling in sites located at the same distance from the glacier as the terrestrial ones. The distance from the glacier front was considered as a proxy for time since deglaciation since these variables are positively correlated. We tested if the distance from the glacier front affects: i) the species richness; ii) taxonomic diversity; and iii) species turnover. Carabid species richness and taxonomic diversity increased positively from recently deglaciated sites (those c. 160 m from the glacier front) to sites deglaciated more than 160yrs ago (those located >1300 m from glacier front). Species distributions along the glacier foreland were characterized by mutually exclusive species. Conversely, no pattern in chironomid species richness and turnover was observed. Interestingly, taxonomic diversity increased significantly: closely related species were found near the glacier front, while the most taxonomically diverse species assemblages were found distant from the glacier front. Increasing glacial retreat differently affect epigeic and aquatic insect taxa: carabids respond faster to glacier retreat than do chironomids, at least in species richness and species turnover patterns.

scholarly journals Bird and mammal conservation in Gaoligongshan Region and Jingdong County, Yunnan, China: patterns of species richness and nature reserves

Oryx ◽  
2000 ◽  
Vol 34 (4) ◽  
pp. 275-286 ◽  
Author(s):  
Daoying Lan ◽  
Robin Dunbar
Keyword(s):  
Species Richness ◽  
Population Density ◽  
Human Population ◽  
Yunnan Province ◽  
Nature Reserve ◽  
Present Situation ◽  
Primary Forest ◽  
Mammal Conservation ◽  
Latitudinal Patterns ◽  
Conservation Of Biodiversity

AbstractElevational and latitudinal patterns of species richness for birds and mammals were compared with human population density in relation to nature reserve designation in two areas of Yunnan Province, China. Results suggest that species richness is not the same for the two areas. In Gaoligongshan Region, species richness is inversely correlated with elevation and altitude, while reserve designation is positively correlated with elevation and latitude. In Jingdong County, reserve designations are positively correlated with elevation, but species richness shows no clear trends. In general, the present situation is strongly influenced by human activities. It appears that reserve designation is mismatched with species richness in Gaoligongshan Region, while there is a better fit between the two in Jingdong County. In both areas, however, it appeared that reserves were located primarily in order to reduce conflict with humans rather than to maximize conservation of biodiversity, probably because humans were responsible for forest—especially primary forest—destruction and degradation in the low-lying areas.

Metagenomics Study To Compare The Taxonomy And Metabolism of a Lignocellulolytic Microbial Consortium Cultured in Different Carbon Conditions

2021 ◽  
Author(s):  
Qinggeer BORJIGIN ◽  
Bizhou ZHANG ◽  
Xiaofang Yu ◽  
Julin Gao ◽  
Xin ZHANG ◽  
...  
Keyword(s):  
Microbial Consortium ◽  
Agricultural Waste ◽  
Taxonomic Diversity ◽  
Taxonomic Composition ◽  
Microbial Consortia ◽  
Rich Diversity ◽  
Cazy Database ◽  
Taxonomic Affiliation ◽  
In Situ Biodegradation

Abstract A lignocellulolytic microbial consortium holds promise for the in situ biodegradation of crop straw and the comprehensive and effective utilization of agricultural waste. In this study, we applied metagenomics technology to comprehensively explore the metabolic functional potential and taxonomic diversity of the microbial consortia CS (cultured on corn stover) and FP (cultured on filter paper).Analyses of the metagenomics taxonomic affiliation data showed considerable differences in the taxonomic composition and functional profile of the microbial consortia CS and FP. The microbial consortia CS primarily contained members from the genera Pseudomonas, Stenotrophomonas, Achromobacter, Dysgonomonas, Flavobacterium and Sphingobacterium, as well as Cellvibrio, Azospirillum, Pseudomonas, Dysgonomonas and Cellulomonas in FP. The COG and KEGG annotation analyses revealed considerable levels of diversity. Further analysis determined that the CS consortium had an increase in the acid and ester metabolism pathways, while carbohydrate metabolism was enriched in the FP consortium. Furthermore, a comparison against the CAZy database showed that the microbial consortia CS and FP contain a rich diversity of lignocellulose degrading families, in which GH5, GH6, GH9, GH10, GH11, GH26, GH42, and GH43 were enriched in the FP consortium, and GH44, GH28, GH2, and GH29 increased in the CS consortium. The degradative mechanism of lignocellulose metabolism by the two microbial consortia is similar, but the annotation of quantity of genes indicated that they are diverse and vary greatly. The lignocellulolytic microbial consortia cultured under different carbon conditions (CS and FP) differed substantially in their composition of the microbial community at the genus level. The changes in functional diversity were accompanied with variation in the composition of microorganisms, many of which are related to the degradation of lignocellulolytic materials. The genera Pseudomonas, Dysgonomonas and Sphingobacterium in CS and the genera Cellvibrio and Pseudomonas in FP exhibited a much wider distribution of lignocellulose degradative ability.

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