Alejandro Maeda

Alejandro Maeda
Centro de Investigaciones Biológicas del Noroeste | CIBNOR · Programa de Planeación Ambiental y Conservación

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58
Publications
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906
Citations
Citations since 2017
8 Research Items
265 Citations
201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050

Publications

Publications (58)
Article
For the Mexican oniscideans of the family Armadillidae, 6 species of the genus Cubaris Brandt, 1833 and 18 species of the genus Venezillo Verhoeff, 1928 have been recorded. Of them, only Venezillo stuckchensis (Mulaik, 1960) has been registered for the Baja California Peninsula (BCP). This species was described upon a single male and no biological...
Article
The amphidromous species of Macrobrachium Spence Bate, 1868 occurring on the Mexican Pacific slope (M. americanum Spence Bate, 1868, M. digueti (Bouvier, 1895), M. hobbsi Nates & Villalobos in Villalobos Hiriart & Nates Rodríguez, 1990, M. occidentale Holthuis, 1950 (Holthuis, 1950b), and M. tenellum (Smith, 1871)) show a disjunct distribution, wit...
Article
The amphidromous species of Macrobrachium Spence Bate, 1868 occurring on the Mexican Pacific slope (M. show a disjunct distribution, with the abscence of records along about 2000 km of the coastal margins in the northern Gulf of California. Recent morphological and genetic studies using the mitochondrial genes 16S rRNA (16S) and cytochrome oxidase...
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To date 86 species of 33 genera and 16 families of Oniscidea have been recorded in Mexico. Collections of 4 academic institutions and recent field materials were revised. From 1,820 specimens, 1,417 (77.6%) were determined to belong to 6 exotic forms. A taxonomic account and a species identification key with SEM plates of these exotic entities are...
Article
Six amphidromous species of MacrobrachiumSpence Bate, 1868 have been recorded on the Pacific slope of Mexico, including the two morphologically related M. hobbsi Nates & Villalobos in Villalobos Hiriart & Nates Rodríguez, 1990 and the Atlantic species M. olfersii (Wiegmann, 1836). The hypothesis that the formation of the Isthmus of Panama in the La...
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Branchinecta lindahli is a generalist fairy shrimp that has a widespread distribution in North America. We initiated a study to better understand the geographic structure of genetic variation within this species and to test if cryptic species are present in B. lindahli. Additionally, we examined four other species of Branchinecta to test if there w...
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This original form of this rebuttal was submitted to Science on 3 March 2017 (limited to 300 words as per Science editorial policy) but rejected on 13 March 2017. Herein, we elaborate on our original Science submission in order to more fully address the issue without the length limitations. This rebuttal is followed by the list of the signatories w...
Article
Macrobrachium digueti (Bouvier, 1895), an amphidromous shrimp with unequal chelae, was described from Mulegé River in Baja California Peninsula, Mexico. A controversy on the morphological identity of M. digueti started six decades ago. Some authors point out that the redescription given in 1952 by L. Holthuis in his important revision of the Palaem...
Article
Thamnocephalus is endemic to the American continents, being recorded in the USA, Mexico, Venezuela, Aruba, and Argentina with four recognized species: T. venezuelensis Belk and Pereira, 1982 and T. salinarum Cohen, 2002 from South America, and T. mexicanus Linder, 1941 and T. platyurus Packard, 1877 from North America. A systematic review of Mexica...
Article
As a part of an ongoing research initiative on Sonoran Desert large branchiopod biodiversity, we conducted extensive field surveys along the Baja California Peninsula. We present here a taxonomic review of the genus Branchinecta on this peninsula. The results confirm the presence of B. lindahli Packard, 1883, B. mackini Dexter, 1956, and B. sandieg...
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During a zooplankton study in southern China, Streptocephalus specimens were collected from ephemeral ponds located in the Yunnan Province and the Guangxi Zhuang Autonomous Region. We determined that the specimens from both locations are Streptocephalus sirindhornae Sanoamuang, Murugan, Weekers, and Dumont, 2000. This documents are the first record...
Article
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Resumen. Se determinó el estatus actual de conservación de 6 peces dulceacuícolas nativos de la península de Baja California (Entosphenus tridentatus, Oncorhynchus mykiss nelsoni, Fundulus lima, Cyprinodon macularius, Gasterosteus aculeatus y Gobiesox juniperoserrai), incluidos en la Norma Oficial Mexicana 059-2010, a partir de la información obten...
Article
Six morphological species of the genus Macrobrachium occur in the Baja California Peninsula (M. americanum, M. digueti, M. hobbsi, M. michoacanus, M. olfersii, and M. tenellum). Their presence is an interesting topic for the systematics of the group, given that their distribution shows a distinct disjunct on the coastal plains of the northern part...
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El estatus actual que guarda la distribución de peces exóticos e invasores en el noroeste de México es documentado para 36 especies (Baja California, 27 especies; Baja California Sur, ocho; Sonora, 26, y Sinaloa, siete), basado en registros de especímenes recolectados entre 1977 y 2012 y complementado con reportes en literatura u observaciones de c...
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A new species of the freshwater cyclopoid copepod genus Metacyclops Kiefer, 1927 is described from a single pond in northern Mexico, within the binational area known as the Chihuahuan Desert. This species belongs to a group of Metacyclops species with a 3443 spine formula of swimming legs. It is morphologically similar to Metacyclops lusitanus Lind...
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E n 1988 un grupo de investigadores del CIBNOR, bajo la coordinación del Dr. Alfredo Ortega Rubio, publicó uno de los libros más completos que se han hecho en México para apoyar, con bases científi cas, la creación de un área protegida. En este caso la reserva de la biosfera Sierra La Laguna, Baja California Sur. Principalmente como resultado de la...
Article
Adults of three fairy shrimp species are present in Thailand from February through June in ephemeral waters (ponds, roadside canals, and rice field ditches) filled mostly by the rain. Branchinella thailandensis is of interest in aquaculture because it reproduces rapidly and has high nutritional value. However, no detailed studies on its reproductiv...
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Resumen El presente capítulo trata sobre las especies de langostinos (Crustacea, Decapoda, Caridea) y peces (Teleostei) que ocurren en cuencas hidrológicas relacionadas con la Reserva de la Biosfera Sierra La Laguna (REBIOSLA), Baja California Sur, México. El polígono que limita geográficamente a la REBIOSLA abarca las secciones altas de nueve de l...
Article
The first meiotic prophase was analyzed in both genders of Pacific white shrimp Litopenaeus vannamei. Progression through meiosis, from the formation of the synaptonemal complex to diplotene is described during molting stages. Most of the meiotic cells in both genders were observed at pachytene, recognized by complete synapsis of bivalents. In both...
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Bahia Salina Cruz, Oaxaca, Mexico is a major center of oil and refined product distribution on the Mexican Pacific coast. From the start of oil industry operations in 1979, negative effects from discharges of treated effluents in the bay have been a constant concern for local communities. We analyzed 28 surface sediment samples obtained in June, 20...
Article
Timing of organogenesis and subsequent development of genital organs were studied in female and male Pacific white shrimp Penaeus (Litopenaeus) vannamei postlarvae. This was linked to the timing of differentiation of external structures that differentiate the genders. Anatomy of the gonad appears to be unique for penaeid species. The genital organ...
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The bacteria Microbacterium sp. 8L and Exiguobacterium mexicanum 8N are known to improve the culture of Artemia franciscana using baker's yeast as food. Using spectrophotometry, sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS-PAGE), substrate-SDS-PAGE and pH-stat in vitro-digestibility assays, the activity, molecular mass and hydrol...
Article
The effect of Microbacterium sp. strain 8L and Exiguobacterium mexicanum strain 8N was evaluated in the diet of Artemia under xenic conditions. Viable cultures of bacteria were provided to xenic cultures of Artemia in combination with Sacharomyces cerevisiae, cornflour or Spirulina, and the effect on the survival and growth was recorded. The use of...
Article
We describe three diploid gynandromorphs in Artemia. Two belong to A. parthenogenetica and represent the first report of gynandromorphy for the species. One specimen was a female with a globular brood-pouch and gynandromorphic second antennae, whilst the other was a female with a closed malformed brood-pouch filled with live nauplii, and a long, mo...
Article
We report the first two records of the fairy shrimp Streptocephalus moorei from the United States, previously known only from its type locality in southeastern Chihuahua, México. An updated morphological diagnosis and habitat data are provided. Streptocephalus moorei, previously considered as a critically endangered species under the IUCN red list...
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Freshwater decapods like the palaemonid river shrimp have received little attention in the Baja California Peninsula, México. From the first formal report in 1878 to now, only three Macrobrachium species have been reported (M. americanum, M. digueti, and M. tenellum) from the peninsula in only three basins. We made a taxonomic study of freshwater s...
Article
The growing demands and high costs of commercial Artemia cysts and the establishment of new shrimp hatcheries and farms have caused people to search for local sources of Artemia, putting special attention on their nutritional characteristics. As an essential step to determine the biochemical composition of Artemia, the fatty acid profiles of decaps...
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We report on the morphology and occurrence of the “mystax,” an overlooked cephalic structure found in males of certain Notostraca. The mystax is a conspicuous, protuberant, dark-brownish sclerodermal stripe located on the anteroventral flange of the carapace. Histological sections show the mystax as an expansion of the exoskeleton formed by the exo...
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The gonadic histology of the tadpole shrimp Triops sp. from 22 Mexican locations was determined using light microscopy to investigate the hermaphroditic tissue. The sex ratio and type of morphotypes were also determined. Short morphotype individuals with ovisacs (58) were hermaphrodites and were recorded from 14 locations. Of the 34 long morphotype...
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In a previous study, Exiguobacterium mexicanum strain 8N (DSM 16483 T) and Microbacterium sp. strain 8L (DSM 16485) in gnotobiotic cultures of the brine shrimp, Artemia franciscana indicated beneficial effects on the development of Artemia larvae. In this study, Artemia larvae with and without autoclaved yeast as food, were challenged with strains...
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Species representation and gender proportion from mixed Artemia franciscana and A. parthenogenetica commercial cysts from the Great Salt Lake were obtained experimentally under 31 incubation temperatures from 10°C to 40°C. From 10°C to 32°C, the species representation was skewed to about 65% parthenogenetic females. From 33°C to 38°C, the zygogenet...
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The only species of the genus Triops in Australia, T. australiensis, is found to reproduce by gonochorism. Morphological and reproductive data and molecular analyses of fragments of mitochondrial genes 12S rRNA (12S) and cytochrome oxidase I (COI) indicate that a Triops population from the middle Paroo in north-western New South Wales is composed o...
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Using a fragment of the mitochondrial 16S ribosomal RNA (16S) and cytochrome oxidase I (COI) gene sequences, the biodiversity and phylogenetic relationships of the brine shrimp Artemia from tropical salterns of southern México (four sites in the Yucatán Peninsula, one site each in the states of Oaxaca and Campeche), and two sites in Cuba were exami...
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The red crayfish Procambarus clarkii, which is native to southcentral USA and northeastern Mexico, has been successfully introduced into several countries around the world. This study documents the geographic expansion of the exotic red crayfish in Mexico and discusses the consequence of a greater propagation of this species in Mexican inland water...
Article
Environmental effects on sex determination in Litopenaeus vannamei were studied by rearing day 1 postlarvae at three temperatures, under three photoperiods, at high density and by starving. None of the environmental conditions affected sex determination or differential development of gender in this species. From day 50, the development of the endop...
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This study was carried out with a natural population of the brine shrimp Artemia from Bahía Salinas, in Carmen Island, Baja California Sur, México, with the purpose to determine different ecological and biological characteristics of this crustacean. The field work was performed in two periods in 1999: March to June and August to September. In both...
Article
Two new species of fairy shrimp from North America, Streptocephalus henridumontis and Streptocephalus thomasbowmani, are diagnosed and figured. A brief account on the. conservation status of the New World species of the genus and an updated species identification key are included. Streptocephalus thomasbowmani n. sp., endemic to New Mexico, U.S.A.,...
Article
The brine shrimp Artemia is one of the most studied animals in the world. A large part of the knowledge of this crustacean is based on cysts harvested from two main sources; the Great Salt Lake, UT (GSL), and the San Francisco Bay salterns, CA (SFB), USA. Artemia populations from these habitats are recognized to belong to a single zygogenetic speci...
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The study of bacterial interaction with crustaceans used in aquaculture, such as the brine shrimp Artemia, is gaining importance. It is presumed that some bacteria provide nutritional elements, and/or have the capacity to function as probiotics. In this work, aerobic Gram-positive heterotrophic bacteria associated with commercial Artemia cysts were...
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Cuitzeo is the second largest lake in México (ca. 425 km2). Indigenous people collect clam shrimp (locally known as `conchilla') and sell them dry as pets' food; the income is important for the local economy. To our knowledge, this is the first report of a clam shrimp fishery. Two conchilla species co-occur: Eocyzicus digueti (Richard) and Leptesth...
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Using sequence analyses of fragments of the small and large subunits of mitochondrial genes 12S and 16S rRNA, we studied the molecular identity of five Triops populations from the Baja California Peninsula, Mxico. Additionally, we explored the phylogeny of the genus by comparing with sequence data from gonochoric T. longicaudatus (Zacatecas, Mxico)...
Article
Branchinecta oterosanvicentei, new species, a fairy shrimp endemic to the south of Coahuila, Mexico is described and figured. Differential features between the new species and the related B. lindahli are discussed on the basis of a SEM micrographs. The main diagnostic characters of Branchinecta oterosanvicentei are: (1) a pulvinus covered by scales...
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Two forms (here called short and long) of the tadpole shrimp Triops from the Baja California peninsula (Mexico) exhibit interesting features for aquacultural purposes; rapid growth, early maturation (six days) and uniparental reproduction via cysts (i.e. drought-resistant dormant eggs). The use of Triops for aquaculture depends on the standard prod...
Article
Trypsin-like enzymes from two morphotypes (here called short and long) of the ‘living fossil’ Triops of Baja California Sur, México were studied. Adults of both morphotypes were obtained from outdoor static cultures using dry soil from the natural habitats as a source of cysts and culture substrate. Individual and pooled extracts were made from dis...
Article
This paper reports new distribution records of large branchiopods for Mexico following a three year survey of the Baja California peninsula. The occurance of the anostracans Thamnocephalus mexicanus (Linder, 1941) and T. platyurus (Packard, 1877), the notostracan Lepidurus lemmoni (Holmes, 1894), and the spinicaudatans Eulimnadia cylindrova (Belk,...
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We present observations on the frequency of large branchiopod associations found in north-central Mexico, and in Arizona, USA. Of a total of 25 species involved in these assemblages, 12 were common in both areas. Fifty-eight (43.3%) of the ponds in Mexico, and seventy-eight (47%) of those in Arizona had two or more species present. The combinations...
Article
ABSTRACT Short interval monitoring of isolated females of Streptocephalus dichotomus Baird, S. proboscideus(Frauenfeld), and S. torvicornis (Waga) revealed no resorption of unfertilized oocytes in the lateral pouches of the oviducts or in the ovisac. Oocytes expelled by the female disintegrate in the medium. This finding is in disagreement with ear...
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Coloration of phyllopods varies from place to place and from one life stage to another. It ranges from translucent or whitish through gray, blue, green, orange, and reddish. Here, we present experimental evidence for a food- dependent color pattern inThamnocephalus platyurus Packard. The presence or absence of the synthetic pigment trans — — carote...
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We present an updated diagnosis of 13 Streptocephalus species of North America. Three new species are included. A key to the species is provided. The phylogeny of the group is discussed on the basis of (1) a systematic approach (Maeda-Martínez et al., 1995; this volume), which considers the entire distal antennal outgrowth, the frontal appendage, a...
Article
We designed and standardized a culture method for freshwater anostracans using diets free of live algae.Thamnocephalus platyurus andBranchinecta lindahli were used as test organisms. We used baker's yeast as basic food and added inert particles (clay or amorphic silicium dioxide) to improve the digestion of the yeast. A flow-through culture system...
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We argue that the Würm III glaciation eradicated possible European populations ofS. torvicornis, and that today, a reconquest of Europe takes place on two fronts. A western wave has reached the Pyrenees, an eastern one now occupies most of eastern and northern Europe. The western route probably started in the Maghreb, the eastern one in the Levant...
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While developing a data base for phylogenetic analysis of the New World streptocephalids we compaired them with species from Africa, Europe, and India. In doing this, we found that the morphology of the peduncle of the distal antennal outgrowth and the biramous ovaries developed in seven North American species can contribute to the systematics of t...
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Branchinecta mexicana, new species, a fairy shrimp from central Mexico, is described and figured. Its principal diagnostic characteristic is a squamate appendix on the median side of the basal antennal article. The proximal peglike part of this appendix extends into a posterodorsally directed tip, while its distal part shows 2-5 incisions. Differen...
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A new fairy shrimp,Branchinecta belki n.sp., endemic to the south of Coahuila state is described and figured. A total of nine species of phyllopods, including the new species, occur in ponds in the type area. The laboratory hybridization ofB. belki andB. packardi through ‘no-choice’ mating tests in reciprocal crosses is discussed. A mixture of char...
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We inventorize the known distribution of the species of Anostraca, Notostraca, Spinicaudata, and Laevicaudata present in Mexico. Determinations of the species and their distribution involved: 1) Examination of Mexican collections of phyllopods, 2) Extensive sampling in 17 states, and 3) Study of laboratory cultures. The number of phyllopod species...
Article
Se describe una nueva especie de concostraco de la familia Lynceidae, Paralimnetis mapimi colectada en el Bolsón de Mapimí en los estados de Chihuahua y Durango, México. Este trabajo representa el primer registro del género en Norteamérica, antes conocido únicamente de Paraguay en Sudamérica. Las principales características diagnósticas de la forma...

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Projects (4)
Project
To test the vicariant species diversification hypothesis of Anger (2013) that the closure of the Panama landbridge in Central America in the Late Pliocene was a significant vicariant event that caused species diversification of coastal Macrobrachium in the neotropical region.