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Trophic Interactions Among Sympatric Zooplanktivorous Fish Species in Volume Change Conditions in a Large, Shallow, Tropical Lake
Neotropical Ichthyology, 9(1):169-176, 2011 Copyright © 2011 Sociedade Brasileira de Ictiologia Trophic interactions among sympatric zooplanktivorous fish species in volume change conditions in a large, shallow, tropical lake Rodrigo Moncayo-Estrada1, Owen T. Lind2 and Carlos Escalera-Gallardo1 Significant reductions in the water volume of shallow lakes impose a restriction on species segregation promoting more interactions in the trophic relationships. The diets of three closely related zooplanktivorous silversides belonging to the Atherinopsidae species flock of lake Chapala, Mexico, were analyzed at two sites (Chirostoma jordani, C. labarcae, and C. consocium). Diets were described in critical shallow (August 2000) and volume recovery conditions (August 2005). Diets included mainly cladocerans (Bosmina, Ceriodaphnia, and Daphnia) and copepods (Cyclops). A significant difference in diets was detected when comparing years (MRPP analysis, A = 0.22, p < 0.0001) and sites at different years (MRPP analysis, A = 0.17, p = 0.004). According to niche breadth mean values, species were classified as specialized and intermediate feeders. In shallow conditions, the small range of niche breadth (1.72 to 3.64) and high diet overlap values (D = 0.64, L = 8.62) indicated a high potential for interspecific exploitative interaction. When the lake volume recovered, an increase in the niche breadth range (1.04 to 4.96) and low niche overlap values (D = 0.53, L = 2.32) indicated a reduction of the species interaction. The Mann- Whitney U-test supported this pattern by showing a significant difference between years for niche overlap (p = 0.006). The increased interaction during the low volume suggests alternative segregation in life-history variations and other niche dimensions such as spatial or temporal distribution. -
Exploraciones De Sondeo En Tuzapan, Veracruz: Materiales Y Cronología
María Rosa Avilez Moreno Exploraciones de sondeo en Tuzapan, Veracruz: materiales y cronología Resumen: Tuzapan fue la cabecera de un altépetl prehispánico ubicado en lo que hoy es el centro- norte de Veracruz y habría sido conquistado por los mexicanos durante sus incursiones hacia la costa del Golfo. Aun cuando no se menciona en la Matrícula de tributos, ni en el Códice Mendo- cino, las evidencias materiales confirman una ocupación en el Posclásico tardío, y hay referencias explícitas en documentos coloniales tempranos como la Suma de visitas o las Relaciones geográ- ficas. Incluso su glifo aparece representado en documentos más tardíos, como los lienzos de Tuxpan y de Tzoquetitlán, que presumiblemente hacen referencia a épocas más tempranas. En este artículo se exponen algunos avances en el conocimiento logrados por el proyecto arqueoló- gico en la cuenca del río Necaxa mediante su trabajo de campo y de gabinete. La excavación, el análisis de los materiales recuperados y los fechamientos efectuados determinaron algunas de las características culturales del sitio, su cronología, la secuencia de ocupación y algunos vínculos interculturales. Se describen los pozos de sondeo y los hallazgos realizados en cada uno de ellos; se esboza una tipología cerámica tentativa; se describen los materiales líticos, y se exponen los resultados de los fechamientos por paleomagnetismo y por radiocarbono. Palabras clave: Tuzapan, Golfo de México, tipos cerámicos, lítica, fechamientos. Abstract: Tuzapan was the head of a pre-Hispanic altepetl (city-state) located in what is today north-central Veracruz and it would have been conquered by the Mexicas during their incursions into the Gulf Coast. -
Central Region of the Sierra Madre Oriental Executive Summary
CLIMATE CHANGE ADAPTATION PROGRAMME FOR THE CENTRAL REGION OF THE SIERRA MADRE ORIENTAL EXECUTIVE SUMMARY Climate change poses a growing threat to Mexico’s ecosystems and communities. Cou- pled with climate variability and socio-economic factors, such as changes in land use, it has adverse effects on ecosystems and livelihoods in rural communities. Regional and local planning tools are therefore required to implement climate change adaptation and mitigation strategies. One example is the Central Region of the Sierra Madre Oriental mountain range (RCSMO, for its initials in Spanish), whose biodiversity-rich ecosystems are vulnerable to climate change. This has an impact on local communities, because their livelihoods depend pri- marily on the area’s natural resources. Hence it is vitally important to assess the resilience of the ecosystems and the ability of local communities to cope with the effects of climate change. In 2010, the National Commission of Natural Protected Areas (CONANP) responded by developing the Climate Change Strategy for Protected Areas (ECCAP). The Climate Change Adaptation Programme for the Central Region of the Sierra Madre Oriental (PACC-RCSMO) is an essential part of this project. The area of intervention is ap- proximately 2.15 million hectares, covering parts of the states of Tamaulipas, San Luis Po- tosí, Hidalgo, Puebla and Veracruz and portions of three major river basins� which drain into the Gulf of Mexico (Pánuco, San Fernando-Soto la Marina and northern Veracruz). Four natural protected areas (NPAs) were established in the RCSMO region. Three of them are federal NPAs and the fourth NPA is set to be declared. -
Oocyte Structure and Ultrastructure in the Mexican Silverside Fish Chirostoma Humboldtianum (Atheriniformes: Atherinopsidae)
Oocyte structure and ultrastructure in the Mexican silverside fish Chirostoma humboldtianum (Atheriniformes: Atherinopsidae) Rodolfo Cárdenas1, Mónica Chávez1, José Luis González1, Patricia Aley2, Jesús Espinosa2 & Luis Felipe Jiménez-García3 1. Laboratorio de Endocrinología de Peces, Unidad de Morfología y Función, F.E.S.-Iztacala, U.N.A.M.; rodolf@servi- dor.unam.mx 2. Laboratorio de Neuromorfología, U.I.I.C.S.E., F.E.S.-Iztacala, U.N.A.M. 3. Laboratorio de Microscopia Confocal, Facultad de Ciencias, U.N.A.M. Received 11-VII-2007. Corrected 30-VI-2008. Accepted 31-VII-2008. Abstract: the structural and ultrastructural features of gonads from endemic Mexican fish have received scarce attention. This study describes the histological and ultrastructural characteristics of the oocyte in Chirostoma humboldtianum. The ovary is asynchronic, and as such, most phases of oocyte development are found in the same ovary. The complete process of oogenesis was divided in five stages: oogonium and folliculogenesis, pri- mary growth, cortical alveoli and lipid inclusions, vitellogenesis and maturation. The presence of big filaments, which appear at the end of primary growth, induces some common follicular adaptation. During primary growth, abundant ribosomes, rough endoplasmic reticulum, and mitochondria are grouped in the cytoplasm. At the end of this stage, the Z1 layer of the chorion is developed, while microvilli start to be evident as well. In the corti- cal alveoli and lipid droplets phase, intense PAS positive vesicles, some of them containing nucleoid material, are observed in the peripheral cytoplasm and the lipid droplets take a more central position. In vitellogenesis, the proteic yolk accumulates in a centripetal way while the chorion is completely formed. -
Endangered Species
FEATURE: ENDANGERED SPECIES Conservation Status of Imperiled North American Freshwater and Diadromous Fishes ABSTRACT: This is the third compilation of imperiled (i.e., endangered, threatened, vulnerable) plus extinct freshwater and diadromous fishes of North America prepared by the American Fisheries Society’s Endangered Species Committee. Since the last revision in 1989, imperilment of inland fishes has increased substantially. This list includes 700 extant taxa representing 133 genera and 36 families, a 92% increase over the 364 listed in 1989. The increase reflects the addition of distinct populations, previously non-imperiled fishes, and recently described or discovered taxa. Approximately 39% of described fish species of the continent are imperiled. There are 230 vulnerable, 190 threatened, and 280 endangered extant taxa, and 61 taxa presumed extinct or extirpated from nature. Of those that were imperiled in 1989, most (89%) are the same or worse in conservation status; only 6% have improved in status, and 5% were delisted for various reasons. Habitat degradation and nonindigenous species are the main threats to at-risk fishes, many of which are restricted to small ranges. Documenting the diversity and status of rare fishes is a critical step in identifying and implementing appropriate actions necessary for their protection and management. Howard L. Jelks, Frank McCormick, Stephen J. Walsh, Joseph S. Nelson, Noel M. Burkhead, Steven P. Platania, Salvador Contreras-Balderas, Brady A. Porter, Edmundo Díaz-Pardo, Claude B. Renaud, Dean A. Hendrickson, Juan Jacobo Schmitter-Soto, John Lyons, Eric B. Taylor, and Nicholas E. Mandrak, Melvin L. Warren, Jr. Jelks, Walsh, and Burkhead are research McCormick is a biologist with the biologists with the U.S. -
The Brook Silversides (Labidesthes Sicculus) , the Other on the Cisco {Leucichthys Artedi) These Have Been Selected As the First Studies Presented for Three Reasons
THE UNIVERSITY OF ILLINOIS LIBRARY v. If CO "5 Digitized by the Internet Archive in 2011 with funding from University of Illinois Urbana-Champaign http://www.archive.org/details/ecologicalstudyo11cahn THE LIBRARY OF THE OCT 2 4 1927 UNIVERSITY OF ILLINOIS ILLINOIS BIOLOGICAL MONOGRAPHS Vol. XI January, 1927 No. 1 Editorial Committee Stephen Alfred Forbes Homer Le Roy Shantz Henry Baldwin Ward Published under the Auspices of the Graduate School by the University of Illinois Copyright, 1927, by the University of Illinois Distributed October 21, 1927 AN ECOLOGICAL STUDY OF SOUTHERN WISCONSIN FISHES The Brook Silversides (Labidestkes siccidus) and the Cisco (Leucichthys artedi) in Their Relations to the Region WITH 16 PLATES AND 27 TABLES BY ALVIN ROBERT CAHN Contributions from the Zoological Laboratory of the University of Illinois under the direction of Henry B. Ward No. 297 THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN ZOOLOGY IN THE GRADUATE SCHOOL OF THE UNIVERSITY OF ILLINOIS 1924 CoT TABLE OF CONTENTS Page General Ecological Considerations 7 Introduction 7 The region under discussion 9 Climatology 18 Lake Conditions 19 Ecological Habitats of Fishes 22 Rivers and Streams 22 Lakes 22 Fishes of Southern Wisconsin (Waukesha County) 25 Order Rhomboganoidea 25 Family Lepisosteidae 25 Order Cycloganoidea 25 Family Amiidae 25 Order Isospondyli 26 Family Salmonidae 26 Order Apodes 30 Family Anguillidae 30 Order Eventognathi 30 Family Catostomidae 30 Family Cyprinidae 33 Order Nematognathi -
Redalyc.BIOENCAPSULATION of Bifidobacterium Animalis AND
Revista Mexicana de Ingeniería Química ISSN: 1665-2738 [email protected] Universidad Autónoma Metropolitana Unidad Iztapalapa México Vázquez-Silva, G.; Castro-Mejía J, J.; Sánchez de la Concha, B.; González-Vázquez, R.; Mayorga-Reyes, L.; Azaola-Espinosa, A. BIOENCAPSULATION OF Bifidobacterium animalis AND Lactobacillus johnsonii IN Artemia franciscana AS FEED FOR CHARAL (Chirostoma jordani) LARVAE Revista Mexicana de Ingeniería Química, vol. 15, núm. 3, 2016, pp. 809-818 Universidad Autónoma Metropolitana Unidad Iztapalapa Distrito Federal, México Available in: http://www.redalyc.org/articulo.oa?id=62048168012 How to cite Complete issue Scientific Information System More information about this article Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Journal's homepage in redalyc.org Non-profit academic project, developed under the open access initiative Vol. 15, No. 3 (2016) 809-818 Revista Mexicana de Ingeniería Química Ingeniería de alimentos BIOENCAPSULATION OF BifidobacteriumCONTENIDO animalis AND Lactobacillus johnsonii IN Artemia franciscana AS FEED FOR CHARAL (Chirostoma jordani) LARVAE Volumen 8, número 3, 2009 / Volume 8, number 3, 2009 BIOENCAPSULACI ON´ DE Bifidobacterium animalis Y Lactobacillus johnsonii EN Artemia franciscana COMO ALIMENTO DE LARVAS DE CHARAL (Chirostoma jordani) G. Vazquez-Silva´ 2131, Derivation J. Castro-Mej and application´ıa J1, B. of Sanchez´ the Stefan-Maxwell de la Concha equations2, R. Gonzalez-V´ azquez´ 2, L. Mayorga-Reyes2, A. Azaola-Espinosa2* 1Departamento -
GIS-Based Models for the Development of Sustainable
GIS-based models for the development of sustainable aquaculture of native fish species in central Mexico: a catchment level approach for the protection of biodiversity. A thesis submitted to the University of Stirling for the degree of Doctor of Philosophy by Victor Manuel Peredo Alvarez Institute of Aquaculture University of Stirling March 2011 STATEMENT OF ORIGINALITY I herby confirm that this is an original piece of work conducted independently by the undersigned and all work contained here has not been submitted for any other degree. All research material has been duly acknowledge and cited. Signature of Candidate ____________________________ Victor Manuel Peredo Alvarez Date: 31st March 2011 To my Mom and Dad for always believe in me; all I am is thanks to you. And To my lovely wife Elisa and my niece Renata; you are my inspiration. ABSTRACT Over the last 3 decades, freshwater aquaculture has become one of the most important food industries. However the constant introduction of a reduced number of very successful species for aquaculture has been identified as one of the main activities related to the alarming decline of fish biodiversity worldwide. This issue has raised awareness amongst the scientific community, governmental authorities and the general public towards freshwater fish biodiversity. This new awareness has promoted the development of “green” markets and environmentally friendly strategies, aiming for a reliable production of protein sources. The development of native species aquaculture has been presented as a strong alternative for sustainable aquaculture and the protection of biodiversity. However, it seems clear that unplanned native species aquaculture developments can be as detrimental on local biodiversity as the introduction of exotic fish, if not more dangerous. -
Multi-Locus Fossil-Calibrated Phylogeny of Atheriniformes (Teleostei, Ovalentaria)
Molecular Phylogenetics and Evolution 86 (2015) 8–23 Contents lists available at ScienceDirect Molecular Phylogenetics and Evolution journal homepage: www.elsevier.com/locate/ympev Multi-locus fossil-calibrated phylogeny of Atheriniformes (Teleostei, Ovalentaria) Daniela Campanella a, Lily C. Hughes a, Peter J. Unmack b, Devin D. Bloom c, Kyle R. Piller d, ⇑ Guillermo Ortí a, a Department of Biological Sciences, The George Washington University, Washington, DC, USA b Institute for Applied Ecology, University of Canberra, Australia c Department of Biology, Willamette University, Salem, OR, USA d Department of Biological Sciences, Southeastern Louisiana University, Hammond, LA, USA article info abstract Article history: Phylogenetic relationships among families within the order Atheriniformes have been difficult to resolve Received 29 December 2014 on the basis of morphological evidence. Molecular studies so far have been fragmentary and based on a Revised 21 February 2015 small number taxa and loci. In this study, we provide a new phylogenetic hypothesis based on sequence Accepted 2 March 2015 data collected for eight molecular markers for a representative sample of 103 atheriniform species, cover- Available online 10 March 2015 ing 2/3 of the genera in this order. The phylogeny is calibrated with six carefully chosen fossil taxa to pro- vide an explicit timeframe for the diversification of this group. Our results support the subdivision of Keywords: Atheriniformes into two suborders (Atherinopsoidei and Atherinoidei), the nesting of Notocheirinae Silverside fishes within Atherinopsidae, and the monophyly of tribe Menidiini, among others. We propose taxonomic Marine to freshwater transitions Marine dispersal changes for Atherinopsoidei, but a few weakly supported nodes in our phylogeny suggests that further Molecular markers study is necessary to support a revised taxonomy of Atherinoidei. -
Reproductive Biology of Menidia Jordani (Atheriniformes: Atherinopsidae) in Xochimilco Lake, Mexico
Reproductive biology of Menidia jordani (Atheriniformes: Atherinopsidae) in Xochimilco Lake, Mexico Yolanda Mónica Olvera-Blanco,* José Luis Gómez-Márquez,** Bertha Peña-Mendoza,** Ma. Teresa Gaspar-Dillanes*** and Carlos Pérez*** The reproductive biology of Menidia jordani (Woolman, 1894), a native fish of Mexico and one of the most important commercial fish species in Central Mexico for centuries, was analyzed. A monthly sampling bet- ween April 1995 and March 1996 was carried out. Sex ratio was 1.5:1 (female:male), determined by simple observation. Females were larger than males, the largest sizes being 7.2 cm for females and 6.3 cm for males. Standard length at first maturity was 4.8 cm for females and 5.5 cm for males. Monthly variations in gonadosomatic index (GSI), hepatosomatic index (HIS) and ovarian development stages showed that the spawning season occurred mainly from January to May. Best correlation values were between fecundity and length (r = 0.7383; p = 0.0003), compared to those found between fecundity and weight (r = 0.6132; p = 0.002). Fecundity ranged from 143 to 952 eggs per female; mean fecundity was 324 eggs. Key words: Mesa silverside, gonadosomatic index, gonadic maturity, sex ratio. Biología reproductiva de Menidia jordani (Atheriniformes: Atherinopsidae) en el Lago de Xochimilco, México Se analizó la biología reproductiva de Menidia jordani (Woolman, 1894), pez nativo de México, que por varios siglos ha sido una de las especies de peces comercialmente más importantes en el centro de México. Los muestreos se realizaron mensualmente de abril 1995 a marzo 1996. El sexo de los peces fue determi- nado macroscópicamente y la proporción de machos fue significativamente más baja que la de hembras, 1.5:1 (hembra:macho). -
Endangered Species
FEATURE: ENDANGERED SPECIES Conservation Status of Imperiled North American Freshwater and Diadromous Fishes ABSTRACT: This is the third compilation of imperiled (i.e., endangered, threatened, vulnerable) plus extinct freshwater and diadromous fishes of North America prepared by the American Fisheries Society’s Endangered Species Committee. Since the last revision in 1989, imperilment of inland fishes has increased substantially. This list includes 700 extant taxa representing 133 genera and 36 families, a 92% increase over the 364 listed in 1989. The increase reflects the addition of distinct populations, previously non-imperiled fishes, and recently described or discovered taxa. Approximately 39% of described fish species of the continent are imperiled. There are 230 vulnerable, 190 threatened, and 280 endangered extant taxa, and 61 taxa presumed extinct or extirpated from nature. Of those that were imperiled in 1989, most (89%) are the same or worse in conservation status; only 6% have improved in status, and 5% were delisted for various reasons. Habitat degradation and nonindigenous species are the main threats to at-risk fishes, many of which are restricted to small ranges. Documenting the diversity and status of rare fishes is a critical step in identifying and implementing appropriate actions necessary for their protection and management. Howard L. Jelks, Frank McCormick, Stephen J. Walsh, Joseph S. Nelson, Noel M. Burkhead, Steven P. Platania, Salvador Contreras-Balderas, Brady A. Porter, Edmundo Díaz-Pardo, Claude B. Renaud, Dean A. Hendrickson, Juan Jacobo Schmitter-Soto, John Lyons, Eric B. Taylor, and Nicholas E. Mandrak, Melvin L. Warren, Jr. Jelks, Walsh, and Burkhead are research McCormick is a biologist with the biologists with the U.S. -
Relative Clauses in Upper Necaxa Totonac: Local, Comparative, and Diachronic Perspectives1
Relative clauses in Upper Necaxa Totonac: Local, comparative, and diachronic perspectives1 David Beck University of Alberta Relativization strategies in the Totonacan family are largely undescribed, but detailed examination of one of the languages in the group, Upper Necaxa Totonac, reveals the presence of both externally- and internally-headed relative constructions. Also of note is the presence of relativizers that mark the animacy (human/non-human) of the head of the relative construction. This paper will show that, while phylogenetic evidence clearly demonstrates the relativizers to be descended diachronically from interrogative pronouns, they are best treated synchronically as complementizers, an analysis that follows directly from the presence of internally-headed relative constructions. Totonacan languages are spoken by approximately 240,000 people (INEGI 2010) living in an area of east-central Mexico centred on northern Puebla State and including adjacent parts of Hidalgo and Veracruz (see Figure 1; languages dealt with directly in this paper are shown in red). The family is generally considered an isolate; however, recent work has suggested links to Mixe-Zoque (Brown et al. 2011) and Chitimacha (Brown et al. 2014). Although the family has only recently become the object of serious investigation and description, the focus has been largely on its (admittedly spectacular) morphology; little has been written about syntax, and even less about the structure of complex clauses. Relative clauses in particular seem to have been given short shrift—which is surprising, given that from what we do know about them they seem to have some unusual properties. Consider the example in (1) from Upper Necaxa Totonac, the language for which we currently have the most data on relativization:2 1 I would like to thank my consultants in Patla and Chicontla, especially Porfirio Sampayo Macín and Longino Barragán Sampayo, for their help putting this paper together.