Papers by Francisco F. Pedroche
El presente libro muestra la recopilacion del trabajo realizado por investigadores y alumnos que ... more El presente libro muestra la recopilacion del trabajo realizado por investigadores y alumnos que integran la Universidad Autonoma Metropolitana unidades Azcapotzalco, Iztapalapa y fundamentalmente la Unidad Lerma que integra diferentes lineas de investigacion en los diversos programas de estudio que imparte. Mediante monografias cientificas previamente revisadas por pares academicos productos de trabajos publicados en distintas revistas se muestran diferentes tematicas tales como computacion, educacion, ciencia, tecnologia, salud, etc.
Smithsonian Contributions to Botany, 2017
of the Benthic Marine Algae of the Gulf of California: Rhodophyta, Phaeophyceae, and Chlorophyta.... more of the Benthic Marine Algae of the Gulf of California: Rhodophyta, Phaeophyceae, and Chlorophyta. Smithsonian Contributions to Botany, number 106, vi + 125 pages, 5 figures, 1 table, 1 appendix, 2017.-The present treatment constitutes an undated, annotated, systematic review of red, brown, and green benthic marine algae of the Gulf of California, Mexico, using the currently accepted taxon names, with the date and place of valid publication, type locality, and north to south distribution in the Gulf. The systematic list contains 730 species recognized in the Gulf of California, including 490 species of Rhodophyta, 112 species of Phaeophyceae, and 128 species of Chlorophyta. Among the previously recorded marine algae, 39 species are considered uncertain records or to have uncertain taxonomic status, the selection of a lectotype for Gracilaria hancockii resolves its taxonomic status, 3 combinations are made for recognized varieties of Caulerpa chemnitzia, and 15 species are excluded from the Gulf of California marine flora. The geographical distribution range of each species is given from its northernmost to southernmost locales within three regions the Gulf of California: the east coast of the Gulf (states of Sonora, Sinaloa, Nayarit, and northern Jalisco), the west coast of the Gulf (states of Baja California and Baja California Sur), the islands of the Gulf, including the Islas Grandes (=Islas de la Cintura; Midriff Islands), and islands of the states of
Revista Mexicana de Biodiversidad, 2019
Taxonomía y sistemática Las especies del género Bryopsis (Chlorophyta) presentes en las costas de... more Taxonomía y sistemática Las especies del género Bryopsis (Chlorophyta) presentes en las costas del Atlántico mexicano Species of the genus Bryopsis (Chlorophyta) on the Atlantic coasts of Mexico
Hidrobiológica, 2016
RESUMEN Antecedentes. Las especies del género Dictyota presentan una alta plasticidad fenotípica ... more RESUMEN Antecedentes. Las especies del género Dictyota presentan una alta plasticidad fenotípica que contrasta con escasos caracteres morfológicos diagnósticos, lo cual ha llevado a identificar especies con cierta incertidumbre en el Golfo de México. Estudios recientes a nivel mundial refieren filogenias de especies de Dictyota, los que serán la base para contrastar e interpretar los resultados de este estudio. Objetivos. En este trabajo se determina la presencia de una nueva especie para la ciencia del género Dictyota, encontrada en tres localidades del estado de Veracruz, México (Playa Hermosa, Punta Puntillas y Villa Rica). Métodos. Se realizaron análisis filogenéticos y moleculares de secuencias parciales de los genes psbA y cox1, que fueron complementados con análisis morfológicos. Resultados. En los análisis filogenéticos de las secuencias parciales de los genes psbA y cox1, se obtuvo que las muestras de la nueva especie forman un clado monofilético bien soportado. Además, los índices de divergencia genética obtenidos, se encuentran dentro de los valores interespecíficos para el género, lo que permite segregar a Dictyota chalchicueyecanensis sp. nov. de las demás especies del género. Morfológicamente esta nueva especie se caracteriza por presentar un talo erecto, sin iridiscencia, de consistencia rígida al tacto, con pie de fijación al sustrato de forma discoide, de color café claro in situ, ápices redondeados, ramificación dicotómica, con márgenes dentados de forma triangular a espinosa dirigidos hacia los ápices. Esporangios aislados o agrupados en ambas superficies del talo que regularmente germinan en las porciones interdicotómicas basales del mismo. Conclusiones. Los resultados anteriores amplían la diversidad del género Dictyota a nivel mundial, incorporando a D. chalchicueyecanensis como una nueva especie probablemente endémica de México.
Productos del vínculo Investigación-Docencia, 2018
Actualmente la degradación de los recursos hídricos es un tema de suma importancia a nivel mundia... more Actualmente la degradación de los recursos hídricos es un tema de suma importancia a nivel mundial que ha implicado grandes esfuerzos en métodos que permitan identificar de forma más eficiente el estado de un cuerpo de agua con respecto a su contaminación (Shiva, 2003; Samboni et al., 2007).
Phycologia, 2016
Abstract: Molecular-assisted alpha taxonomy has provided novel ways of exploring biodiversity, an... more Abstract: Molecular-assisted alpha taxonomy has provided novel ways of exploring biodiversity, and is of great help in taxa where morphology alone is not sufficient to ensure accurate species recognition or delimit species boundaries. Here, we use this approach to assess the taxonomy of Padina Adanson (Dictyotales, Phaeophyceae), a common brown algal genus in Mexican waters. Numerous individuals of Padina from Pacific and Atlantic tropical coasts were analysed using sequences of psbA, cytochrome c oxidase subunit I, and cox3 to determine evolutionary significant units or putative species. Then, cox3 sequences of some individuals of each group were analysed with a large number of sequences available in Genbank using the generalized mixed Yule coalescent and Poisson tree processes models for species delimitation. Each sample was identified using the original and the most common descriptions in the region. Last, the results were evaluated looking for correlations between the molecular and morphological data. We concluded that at least 12 Padina species occurred in Mexican waters, 10 from samples here revised and 2 inferred from Genbank sequences. The study not only revealed the existence of well-identified species, but also the existence of cryptic and polymorphic species, confirming the importance of reassessing type material for proper delimitation and nomenclature. Finally, the evidence supported the independent status of Padina ramonribae Avila-Ortiz, Pedroche & Díaz-Martínez, which is validated here.
Journal of Phycology, 2000
Fatty acids were measured in G. galathean um grown either phototrophically, or mixotrophically wi... more Fatty acids were measured in G. galathean um grown either phototrophically, or mixotrophically with Storeatula major (Cryptophyceae) as prey. G. galatheanum , like many photosynthetic dinoflagellates, contains high amounts of n-3 long-chain-polyunsaturated fatty acids (LC-PUFA) such as docosahexaenoic acid (DHA, 22:6n-3) and the hemolytic toxic fatty acid 18:5n-3. We hypothesize that a benefit of phagotrophy in G. galatheanum is the acquisition of precursor linolenic acid (18:3n-3) that fuels LC-PUFA synthesis. Phototrophs grew at 0.37 d Ϫ 1 , while mixotrophs grew at 0.40 d Ϫ 1 with a feeding rate of 0.62 d Ϫ 1. Photosynthesis was lower in mixotrophs (3.7 pg C cell Ϫ 1 h Ϫ 1) than phototrophs (4.9 pg C cell Ϫ 1 h Ϫ 1). DHA levels were higher in mixotrophs [3.7 (ϩ / Ϫ 0.11) pg cell Ϫ 1 ] than phototrophs [3.0 (ϩ / Ϫ 0.16) pg cell Ϫ 1 ] and prey [0.4 (ϩ / Ϫ 0.01) pg cell Ϫ 1 ]. 18:5n-3 levels [1.7 (ϩ / Ϫ 0.03) pg cell Ϫ 1 ] were similar in phototrophs and mixotrophs. An intermediate in n-3 LC-PUFA synthesis, 20:4n-3, accumulated in mixotrophs [0.6 (ϩ / Ϫ 0.27) pg cell Ϫ 1 ] relative to phototrophs (not detected) and prey [0.03 (ϩ / Ϫ 0.002) pg cell Ϫ 1 ]. Low ratios of linolenic acid to DHA in phototrophic G. galatheanum (0.14) relative to mixotrophic G. galatheanum (0.29) and prey (2.14) are consistent with substrate limitation of LC-PUFA synthesis in phototrophs. Accumulation of 20:4n-3 suggests incomplete conversion of linolenic acid to DHA, possibly due to conditions in batch culture. We conclude that precursors for n-3 LC-PUFA biosynthesis in G. galatheanum may be acquired through ingestion of S. major , and may partially control feeding/photosynthesis in mixotrophic populations.
Hidrobiológica, 2016
Background. The Galápagos Islands have been the subject of numerous scientific expeditions. The c... more Background. The Galápagos Islands have been the subject of numerous scientific expeditions. The chief source of information on their marine algae is the report published in 1945 by the late William Randolph Taylor on collections made by the Allan Hancock Pacific Expedition of 1934. Prior to this work, there were no published records of Codium from the Galápagos. Taylor recorder six species of Codium of which C. isabelae and C. santamariae were new descriptions. Goals. On the basis of collections made since 1939, we have reviewed the registry of Codium in these islands. Methods. Comparative analysis based on morphology and utricle anatomy. Results. Codium isabelae and C. santamariae are combined under the former name. Records of C. cervicorne and C. dichotomum also are referred to C. isabelae, those of C. setchellii are based partly on representatives of C. picturatum, a recently described species from the Mexican Pacific, Panama, Colombia, and Hawaii, and partly on representatives of a species similar if not identical to C. arabicum. The presence of C. foveolatum is corroborated. Codium fernandezianum, which was also reported by Taylor from the mainland of Ecuador, has been collected on Isla Santa Cruz. Conclusions.
Botanica Marina, 2014
The names Codium schmiederi and Codium dawsonii are validated by the provision of designated type... more The names Codium schmiederi and Codium dawsonii are validated by the provision of designated types. The species to which the invalidly published name C. schmiederi applies is known only from Isla Guadalupe and Rocas Alijos, Baja California, Mexico. The history of phycological exploration of these two remote localities is detailed. The species to which the invalidly published name C. dawsonii applies is found in those two localities as well as on coastal islands of Baja California and southern California. It is seldom found on the mainland. Codium hubbsii, originally described from Islas San Benito, has a distribution similar to that of C. dawsonii, but occurs more often on the mainland. The distributions of these three species constitute a pattern of insular endemism.
Hidrobiologica, 2011
The seaweed flora of California, USA and Baja California, Mexico is a world-class treasure. The m... more The seaweed flora of California, USA and Baja California, Mexico is a world-class treasure. The magnificent diversity and abundance of seaweed populations reflect the dramatic sweep of these rich coastal environments and habitats, from the Pacific Northwest to the subtropics, including rocky shores and reefs, sandy beaches, and offshore islands. Novel species have joined the flora, mostly via unintentional introductions of non-indigenous species by humans. Most of the 29 non-native seaweed species recorded from this coast originated in Asia. Many have been “discovered” within the last 30 years. Although the vectors that bring these plants or their propagules to the California and Baja California coasts (international shipping and shellfish aquaculture) may or may not be increasing within that time span, the conditions for the establishment of non-native species seem to have improved. Climate change, including the frequency and severity of ENSO events, may be responsible for creating...
All records of species and infrapecific taxa of benthic marine algae from Pacific Mexico publishe... more All records of species and infrapecific taxa of benthic marine algae from Pacific Mexico published after 1847 (the beginning of phycological exploration of the region) have been assembled in a catalogue. In this second volume we are covering Phaeophycota (brown algae). An attempt was made to include all records of brown algae through 2005. Within the Phaeophycota, orders are arranged according to an assumed phylogenetic scheme, whereas families, genera, species, and infraspecific taxa are arranged alphabetically within the next higher taxon. The taxonomic framework takes into account recently published opinions. For each species or infraspecific taxon the accepted name is given, together with its author, place of publication, and type locality. Basionyms, homotypic and heterotypic synonyms, and misapplied names are also given whenever they are appropriate. Authorities for synonomies and misapplied names are given. Records are organized geographically from north to south, representing approximately 310 localities. An alphabetical list of localities with their latitude and longitude is given in an appendix. Within each locality, records are listed chronologically. For each species or infraspecific taxon the first record for Pacific Mexico is noted as well as its worldwide distribution. Taxonomic and nomenclatural notes are provided whenever they are appropriate. The number of species and infraspecific taxa of Phaeophycota in this catalogue is 174, distributed among 11 orders, 24 families, and 66 genera. The number of original records is approximately 1500. Duplicated records based solely on previously published records have been omitted. Theses, abstracts, and technical reports were not included. This catalogue is an edited compilation that, with few exceptions, did not entail consultation of herbarium specimens. Numerous records, especially those of species previously known only from the Atlantic or Indian oceans, warrant further investigation. Specimens on which these dubious records are based should be reviewed by a specialist in the appropriate taxonomic group. Primeros registros Este apartado nos permite reconocer cuando y quién o quienes fueron los primeros en registrar determinado taxon para las costas del Pacífico de México. Para el caso, por ejemplo, de las especies no nativas nos da una idea de la posible fecha de introducción o aparición en nuestras costas. Incluso, nos brinda información sobre la posible desaparición de especies nativas. Estos aspectos ha sido tratados ligeramente en la ficología nacional. Distribución mundial Con la idea de brindar un panorama global de la presencia del taxon se incluyó la distribución mundial hasta la fecha conocida. Notas Este inciso enfatiza, en la mayoría de las ocasiones, la opinión que los autores de esta obra tienen sobre la taxonomía, nomenclatura, distribución, ecología de algunos de los taxa o la posibilidad de estar frente a registros inciertos. Estas notas esperamos además sirvan como guía para la solución de algunos de los muchos problemas detectados durante la elaboración del catálogo.
Hidrobiologica Revista Del Departamento De Hidrobiologia, 2006
REsumEn El inventario de macroalgas para 17 localidades en el litoral de Chiapas se compone de 53... more REsumEn El inventario de macroalgas para 17 localidades en el litoral de Chiapas se compone de 53 especies, incluyendo 16 Chlorophyta , 8 Phaeophyta y 29 Rhodophyta. De las 53 especies, 32 crecen en ambientes estuarinos. Las afinidades florísticas de los estuarios chiapanecos con aquellos del sur del Golfo de México y norte de Quintana Roo, junto al registro fósil, sugieren un contacto marino durante los períodos Eoceno y Mioceno. La presencia de dos macroalgas rojas (una de ellas aún no bien clasificada) en el bentos profundo frente a Chiapas confirma biológicamente la surgencia detectada por la oceanografía física y química. Las afinidades florísticas (Chlorophyta) de Chiapas con
Bot Mar, 1994
A new species, Caloglossa apomeio/iea West el Zuccarello, is described based on material from San... more A new species, Caloglossa apomeio/iea West el Zuccarello, is described based on material from San Carlos, Bahia Magdalena, Bajo Califomia Sur. The species is morphologically similar to C. lepriellrii but characterised by the production of bisporangia and, less commonly, tetrasporangia, and the lack of sexually reproducing plants. In eight culture isolates from throughout the geographic range of the species only the bisporangia were viable. The present known distribution of Caloglossa apomeialiea is from Bahia Magdalena, Baja California Sur to BalTa de Navidad, Jalisco in Pacific Mexico. It is suggested that C. apo111eioliea is derived from C. leprieurii populations flllther south in the Americas through a loss of sexual reproduction. Based on our field collections in March, 1993 the nearest populations of sexually reproducing C. leprieurii are 1200 kl1l away in Estero las Garzas, Chiapas, Mexico and extend south into Guatemala.
Revista Mexicana De Biodiversidad Vol 77 No 001, Sep 23, 2011
Presencia de las fases carposporofíta y tetrasporofíta sobre el mismo talo en Polysiphonia panicu... more Presencia de las fases carposporofíta y tetrasporofíta sobre el mismo talo en Polysiphonia paniculata Mont. Ciencias Marinas 10(2): 181-183, 5 figs.
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Papers by Francisco F. Pedroche