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Articles 1201 - 1230 of 2464

Full-Text Articles in Ecology and Evolutionary Biology

El Arbolado De Los Espacios Públicos Abiertos De La Zona De Monumentos Del Centro Histórico De La Ciudad De Puebla, Víctor Gutiérrez-Pacheco, Sonia Emilia Silva-Gómez, José Silvestre Toxtle-Tlamani, J. Santos Hernández-Zepeda Jan 2015

El Arbolado De Los Espacios Públicos Abiertos De La Zona De Monumentos Del Centro Histórico De La Ciudad De Puebla, Víctor Gutiérrez-Pacheco, Sonia Emilia Silva-Gómez, José Silvestre Toxtle-Tlamani, J. Santos Hernández-Zepeda

Estudios en Biodiversidad

Los conglomerados humanos, presentan espacios públicos abiertos (EPA´s), sobre todo arbolados, con funciones estéticas, sociales y ambientales. Se requiere información e indicadores con un enfoque ecológico, para que su atención descanse sobre una planeación documentada. Así, se pretende conocer la composición arbórea, su distribución y la biodiversidad en los Espacios Públicos Abiertos (EPA´s) de la Zona de Monumentos del Centro Histórico de la Ciudad de Puebla (ZMCHP). Por tanto, se contaron los especímenes, se ubicaron en los EPA´s y se identificaron. Para determinar la biodiversidad se aplicó el Índice de Diversidad de Shannon-Wiener (H´). En 25 EPA´s, se censaron 1,120 …

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Belowground Bud Bank Of Bromus Inermis In Response To Mowing Frequency Over Two Growing Seasons, Denise Olson, Lan Xu, Arvid Boe, N. H. Troelstrup Jr. Jan 2015

Belowground Bud Bank Of Bromus Inermis In Response To Mowing Frequency Over Two Growing Seasons, Denise Olson, Lan Xu, Arvid Boe, N. H. Troelstrup Jr.

Native Plant Focused Publications

Smooth bromegrass (Bromus inermis) is a Eurasian C3 perennial grass. It was introduced to North America in 1884 to control soil erosion and for pasture improvement, but has been outcompeting the native grasses of the northern Great Plains, decreasing diversity and altering habitats. Control of smooth bromegrass is a key to improve degraded native dominated grasslands. However, current practices have minimal or only short term effects due to extensive rhizome and tiller production by bromegrass. Even though vegetative reproduction via the belowground bud bank is the primary means for its invasiveness and persistence, the effect of management on its bud …

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Using The Past To Restore The Future: Quantifying Historical Vegetation To Assist In Tidal Freshwater Wetland Restoration, Christopher D. Gatens Jan 2015

Using The Past To Restore The Future: Quantifying Historical Vegetation To Assist In Tidal Freshwater Wetland Restoration, Christopher D. Gatens

UROP Posters

Wetlands have been providing humans with critical natural ecosystem services throughout our time on Earth. Nevertheless, these invaluable ecosystems have been habitually altered as a cost of human progression. Two of the most common alterations to wetlands are damming and filling. Both occurred along Kimages Creek in Charles City County, VA during the 19th and 20th centuries. In 2010 the Lake Charles dam was partially removed, restoring the creek’s tidal communication with the James River. Upon the recession of the body of water, numerous woody stumps were revealed. We studied these stump remnants in an attempt to assess …

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Robert Folger Thorne—A Botanical Legacy Jan 2015

Robert Folger Thorne—A Botanical Legacy

Aliso: A Journal of Systematic and Floristic Botany

Robert F. Thorne, distinguished botanist and former curator of the herbarium at Rancho Santa Ana Botanic Garden, left a rich botanical legacy. Contributions featured include a list of his articles appearing in Aliso: A Journal of Systematic and Evolutionary Botany, as well a list of plant taxa named for him.

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Presencia De Metales Pesados En La Reserva De La Biosfera Barranca De Metztitlán, Hidalgo, México, Irving Giovanny González-Salazar, Maritza López-Herrera, Scott Monks, Griselda Pulido-Flores Jan 2015

Presencia De Metales Pesados En La Reserva De La Biosfera Barranca De Metztitlán, Hidalgo, México, Irving Giovanny González-Salazar, Maritza López-Herrera, Scott Monks, Griselda Pulido-Flores

Estudios en Biodiversidad

La Reserva de la Biosfera Barranca de Metztitlán es un área natural protegida por la gran diversidad de flora y fauna existente en la misma. La zona es atravesada por un río de gran longitud que se extiende desde el municipio de Tulancingo hasta su desembocadura en la Laguna de Metztitlán, en la zona núcleo de la reserva. A lo largo del cauce del río se ubican algunos asentamientos humanos y zonas industriales, que vierten aguas residuales domésticas e industriales. Además, el agua del río es un recurso natural utilizado como agua de riego para las zonas agrícolas, que con …

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Percepción De Calidad De Vida, Contaminación Y Riesgo En Localidades Rurales Del Municipio De Tecoanapa, Guerrero, Rocío López-Velasco, América Rodríguez-Herrera, Humberto González-González, Branly Olivier-Salomé, Consuelo Montalvo-Marques Jan 2015

Percepción De Calidad De Vida, Contaminación Y Riesgo En Localidades Rurales Del Municipio De Tecoanapa, Guerrero, Rocío López-Velasco, América Rodríguez-Herrera, Humberto González-González, Branly Olivier-Salomé, Consuelo Montalvo-Marques

Estudios en Biodiversidad

En el presente trabajo se realizó un análisis sobre la percepción de calidad de vida, contaminación y riesgo en nueve comunidades rurales del Municipio de Tecoanapa, Guerrero. Para ello, se seleccionaron nueve comunidades que cumplieran con tres aspectos: rezago social (muy alto, medio y muy bajo); ubicación (cerca de ríos); y vivencias en conflictos y embates ambientales. Se levantó una encuesta a jefes de familia en febrero de 2014. Registrando que el 70% de los habitantes afirmaron tener una buena calidad de vida. Al cuestionarlos sobre contaminación, el 59.9% consideró que si existe y está asociada al agua. El 52.0% …

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Plantas Útiles De Tres Municipios (Metztitlán, Atotonilco El Grande Y Huasca De Ocampo) De La Reserva De La Biosfera Barranca De Metztitlán, Hidalgo, México, Miguel Ángel Villavicencio-Nieto, Blanca Estela Pérez-Escandón, Berenice N. López-Gutiérrez Jan 2015

Plantas Útiles De Tres Municipios (Metztitlán, Atotonilco El Grande Y Huasca De Ocampo) De La Reserva De La Biosfera Barranca De Metztitlán, Hidalgo, México, Miguel Ángel Villavicencio-Nieto, Blanca Estela Pérez-Escandón, Berenice N. López-Gutiérrez

Estudios en Biodiversidad

Existen muy pocos trabajos etnobotánicos realizados en la Reserva de la Biosfera Barranca de Metztitlán, por lo que el objetivo de este estudio fue generar un listado preliminar de plantas útiles de la Reserva. Se aplicaron entrevistas a habitantes de localidades ubicadas en la zona, para colectar las plantas útiles mencionadas se hicieron recorridos de campo en compañía de informantes, posteriormente las especies fueron identificadas con el uso de claves dicotómicas. Se registraron 83 especies de plantas útiles, distribuidas en 39 familias y 20 categorías de uso, siendo la medicinal la mejor representada por número de especies. Conocer el uso …

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Drought Resistance And Resilience Of Non-Native Vs. Native Grasses In The Northern Tallgrass Prairie, Wyatt Kirwan Jan 2015

Drought Resistance And Resilience Of Non-Native Vs. Native Grasses In The Northern Tallgrass Prairie, Wyatt Kirwan

Electronic Theses and Dissertations

Drought can have major impacts on rangeland productivity and remains highly unpredictable. Like many other rangelands in the US, the Tallgrass Prairie of eastern South Dakota contains native prairie where the plant composition includes mostly native species as well as pasture that has been converted to or invaded by cool-season introduced species. So how are these two plant communities impacted by drought? The specific objective of this study was to compare drought resistance and drought resilience of native prairie to introduced cool-season pasture (Smooth brome - Bromus inermis and Kentucky bluegrass - Poa pratensis). Our Hypothesis was that native prairie …

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School Gardens: Cultivating A Child’S Nutritional Habits, Environmental Knowledge, And Sustainability Practices, Jeffrey Meltzer Jan 2015

School Gardens: Cultivating A Child’S Nutritional Habits, Environmental Knowledge, And Sustainability Practices, Jeffrey Meltzer

Honors Theses

School gardens have existed since the late nineteenth century and today are becoming increasingly popular in many parts of the world, including where I studied in Maine and Australia (AUS). Multiple organizations support school gardens in Maine, including the Maine School Garden Network, which has over 125 registered school gardens. In AUS, the Stephanie Alexander Kitchen Garden Foundation primarily supports the school garden movement and has over 800 registered school gardens. While many researchers have studied school gardens, few have compared two countries, focused on environmental sustainability, or investigated Maine in particular. This thesis combines information from literature reviews, and …

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Allelopathic Effects Of S. Canadensis On The Germination Of Native Prairie Plants, James David Megenhardt Jan 2015

Allelopathic Effects Of S. Canadensis On The Germination Of Native Prairie Plants, James David Megenhardt

Masters Theses

Solidago canadensis has become a aggressive species of North American prairie forb throughout the world and within restored prairies throughout North America, causing the loss of biodiversity within those ecosystems. While reproductive methods of wind dispersed seeds and clonal expansion through rhizomes has helped S. canadensis colonize and spread through these ecosystems, S. canadensis also releases allelopathic chemicals which may inhibit the germination and growth of competing species. What was unknown is if these same allelopathic chemicals which give S. canadensis an edge within foreign ecosystems might also explain why S. canadensis is so prolific in restored North American …

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Quaking Aspen At The Residential-Wildland Interface: Elk Herbivory Hinders Forest Conservation., Paul C. Rogers, Allison Jones, James Catlin, James Shuler, Arthur Morris, Michael R. Kuhns Jan 2015

Quaking Aspen At The Residential-Wildland Interface: Elk Herbivory Hinders Forest Conservation., Paul C. Rogers, Allison Jones, James Catlin, James Shuler, Arthur Morris, Michael R. Kuhns

Aspen Bibliography

T: Quaking aspen (Populus tremuloides) forests are experiencing numerous impediments across North America. In the West, recent drought, fire suppression, insects, diseases, climate trends, inappropriate management, and ungulate herbivory are impacting these high biodiversity forests. Additionally, ecological tension zones are sometimes created at residential-wildland interfaces with divergent management directives. For example, private conservation reserves bordering public land may be degraded from browsing where game species find refuge from hunting and plentiful forage. We examined putative herbivore impacts to nearly pure aspen forests at Wolf Creek Ranch (WCR), a sparsely developed residential landscape in northern Utah. Forty-three one-hectare monitoring …

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Altered Fire Regimes And The Persistence Of Quaking Aspen In The Rocky Mountains: A Literature Review, Aaron Rosenblum Jan 2015

Altered Fire Regimes And The Persistence Of Quaking Aspen In The Rocky Mountains: A Literature Review, Aaron Rosenblum

Aspen Bibliography

The persistence of quaking aspen (Populus tremuloides Michx.) is of significant importance to land managers in the Rocky Mountain region. Fire suppression in the past century has been implicated as a mechanism influencing aspen population dynamics, as aspen are generally considered an early seral disturbance adapted species. The heterogeneity of aspen community assemblages and fire regimes makes it difficult to discern what the result of fire suppression has been at large spatial and temporal scales. Decision makers should investigate the questions at hand at the stand level in their study location to best determine the mechanisms at play, as well …

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Long-Term Vegetation Change In Utah's Henry Mountains: A Study In Repeat Photography, Charles E. Kay Jan 2015

Long-Term Vegetation Change In Utah's Henry Mountains: A Study In Repeat Photography, Charles E. Kay

Aspen Bibliography

An extensive search was conducted of archival and other sources to locate as many historical photographs as possible for the Henry Mountains in south-central Utah. Those images were then taken into the field, the original camera stations relocated, and modern pictures made of the historical scenes to evaluate long-term vegetation change and land management activities. In all, 626 repeat photo sets were compiled—608 by the author and 18 by Earl Hindley. This book includes 126 photo sets that were representative of the areas studied.

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Regeneration Dynamics Of White Spruce, Trembling Aspen, And Balsam Poplar In Response To Disturbance, Climatic, And Edaphic Factors In The Cold, Dry Boreal Forests Of The Southwest Yukon, Canada, Shyam K. Paudel, Craig R. Nitschke, Suzanne W. Simard, John L. Innes Jan 2015

Regeneration Dynamics Of White Spruce, Trembling Aspen, And Balsam Poplar In Response To Disturbance, Climatic, And Edaphic Factors In The Cold, Dry Boreal Forests Of The Southwest Yukon, Canada, Shyam K. Paudel, Craig R. Nitschke, Suzanne W. Simard, John L. Innes

Aspen Bibliography

The southwestern region of the Yukon Territory of Canada has experienced an unprecedented spruce bark beetle outbreak (Dendroctonus rufipennis) and an increase in the frequency of forest fires that extend beyond historical trends and that have caused significant impacts on forest structure and composition. A Strategic Forest Management Plan (SFMP) for the Champagne and Aishihik Traditional Territory located in the southwest Yukon was implemented in 2004 in response to the spruce bark beetle (D. rufipennis) infestation and increased fire risk. The plan has recommended salvage harvesting of beetle-killed stands as a strategy to facilitate the development …

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Striking The Balance: Challenges And Perspectives For The Protected Areas Network In Northeastern European Russia, Svetlana V. Degteva, Vasily I. Ponomarev, Sasha W. Eisenman, Vyacheslav Dushenkov Jan 2015

Striking The Balance: Challenges And Perspectives For The Protected Areas Network In Northeastern European Russia, Svetlana V. Degteva, Vasily I. Ponomarev, Sasha W. Eisenman, Vyacheslav Dushenkov

Publications and Research

Increasing anthropogenic pressure on the largest remaining tracts of old-growth boreal forest in Europe necessitates additional conservation of ecosystems and biodiversity in northeastern European Russia. In a regional network comprising 8 % of the Nenets Autonomous District and 13.5 % of the Komi Republic, 248 areas have varying protected statuses as state nature reserves (zapovedniks), national parks, reserves/sanctuaries (zakazniks), or natural monuments. Due to increased natural resource extraction in this relatively pristine area, designation of additional protected areas is critical for the protection of key ecological sites. The history of ecological preservation in these regions is herein described, and recent …

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Target-Directed Biosynthetic Evolution: Redirecting Plant Evolution To Genomically Optimize A Plant’S Pharmacological Profile, Dustin Paul Brown Jan 2015

Target-Directed Biosynthetic Evolution: Redirecting Plant Evolution To Genomically Optimize A Plant’S Pharmacological Profile, Dustin Paul Brown

Theses and Dissertations--Neuroscience

The dissertation describes a novel method for plant drug discovery based on mutation and selection of plant cells. Despite the industry focus on chemical synthesis, plants remain a source of potent and complex bioactive metabolites. Many of these have evolved as defensive compounds targeted on key proteins in the CNS of herbivorous insects, for example the insect dopamine transporter (DAT). Because of homology with the human DAT protein some of these metabolites have high abuse potential, but others may be valuable in treating drug dependence. This dissertation redirects the evolution of a native Lobelia species toward metabolites with greater activity …

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Physiological Variation Of Garry Oak (Quercus Garryana) Seedlings To Drought Stress, Matthew A. Merz Jan 2015

Physiological Variation Of Garry Oak (Quercus Garryana) Seedlings To Drought Stress, Matthew A. Merz

All Master's Theses

The purpose of this study was to determine physiological differences in drought response among Garry oak (Quercus garryana Douglas ex Hook. [Fagaceae]) seedlings that grow in distinct populations in Washington state, in order to aid in restoration efforts by informing growers of the potential differences between the acorn collection sites. Acorns from six Washington populations east of the Cascades, as well as one population from Whidbey Island, were collected and grown in containers under controlled conditions. The plants were assessed with and without moderate and severe drought stress induced by withholding water. The most extreme differences in photosynthetic characteristics …

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Vegetation-Based Metrics Of Biotic Integrity For Assessing The Ecological Condition Of Wetlands Of Kentucky, Tanner Matthew Morris Jan 2015

Vegetation-Based Metrics Of Biotic Integrity For Assessing The Ecological Condition Of Wetlands Of Kentucky, Tanner Matthew Morris

Online Theses and Dissertations

Over the last two centuries, wetland acreage across the world has significantly declined due to human disturbances. It has been estimated that Kentucky has lost over 80% of its wetland area. In response to these losses occurring across the United States, the Clean Water Act was passed to halt this dramatic decline and to restore the ecological integrity of waters of the United States. To enforce the Clean Water Act, a number of ecological assessment techniques have been developed to quantify the ecological quality of the waters of the United States. Kentucky recently adopted a rapid method for assessing the …

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Nutrient Competition Between Algae And Juncus Effusus In The Lake Fayetteville Artificial Spiral Wetland, Toryn Jones, Thad Scott Jan 2015

Nutrient Competition Between Algae And Juncus Effusus In The Lake Fayetteville Artificial Spiral Wetland, Toryn Jones, Thad Scott

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

There is insufficient research focusing exclusively on how nutrient competition between algae and wetland macrophytes affects the growth of these species. This study examined the relationship between nutrient concentrations (N and P), algal concentrations, and the growth of Juncus effusus. Juncus effusus growth in the Lake Fayetteville artificial spiral wetland was monitored over a four month period during the prime growing season. Eighteen plants were taken from the wetland and replanted in 1 of 6 treatments: plant-only, algae-only, combined, plant-only +supplement, algaeonly +supplement, or combined +supplement. The algae and combined environments received an inoculation of algae, and the +supplement treatments …

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Helmintos Parásitos De Fauna Silvestre En Las Costas De Guerrero, Oaxaca Y Chiapas, México, Griselda Pulido-Flores, Scott Monks, Jorge Falcón-Ordaz, Juan Violante-González Jan 2015

Helmintos Parásitos De Fauna Silvestre En Las Costas De Guerrero, Oaxaca Y Chiapas, México, Griselda Pulido-Flores, Scott Monks, Jorge Falcón-Ordaz, Juan Violante-González

Estudios en Biodiversidad

La costa sureste del Pacífico en México es rica en biodiversidad, en parte por la posición en la intersección de las corrientes oceánicas ecuatoriales. Sin embargo, los helmintos son un grupo de organismos que ha sido poco estudiado en la región y los registros están en diversas fuentes de información. El propósito de este trabajo es juntar todos los registros de las diferentes especies de hemintos en uno solo. Los registros publicados de helmintos parásitos de vertebrados de la zona incluyen 192 especies de Digenea, Monogenea, Cestoda, Acanthocephala, Nematoda e Hirudinea. Los Digenea son los mejor representados con 34 familias …

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Revisión Bibliográfica De Algunos Términos Ecológicos Usados En Parasitología, Y Su Aplicación En Estudios De Caso, Christian Elizbeth Bautista-Hernández, Scott Monks, Griselda Pulido-Flores, Amado Erick Rodríguez-Ibarra Jan 2015

Revisión Bibliográfica De Algunos Términos Ecológicos Usados En Parasitología, Y Su Aplicación En Estudios De Caso, Christian Elizbeth Bautista-Hernández, Scott Monks, Griselda Pulido-Flores, Amado Erick Rodríguez-Ibarra

Estudios en Biodiversidad

Se realizó una revisión bibliográfica de los términos ecológicos usados en parasitología, de acuerdo con Margolis et al. (1982), Esch et al. (1990), Bush et al. (1997), Bush et al. (2001) y Zander, (2001), que hasta 1982 era un conflicto en parasitología, ya que a que no existían conceptos establecidos para esta área del conocimiento, debido a que esta disciplina se enfocaba principalmente en investigaciones médicas. Aunado a esto, se incurría en conflictos con los conceptos ecológicos como hábitat, sitio, localidad entre otros de igual valor. Con base en lo anterior Margolis et al. (1982) propusieron el desarrollo de nuevos …

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Revisión Del Uso De Céstodos Como Indicadores De Contaminación Por Metales Pesados En Mamíferos De Medios Terrestres, Jorge Falcón-Ordaz, Scott Monks, Griselda Pulido-Flores Jan 2015

Revisión Del Uso De Céstodos Como Indicadores De Contaminación Por Metales Pesados En Mamíferos De Medios Terrestres, Jorge Falcón-Ordaz, Scott Monks, Griselda Pulido-Flores

Estudios en Biodiversidad

En México son pocos los estudios realizados con invertebrados para conocer la concentración de metales pesados en el ambiente, los primeros trabajos fueron realizados con organismos acuáticos. Sin embargo, la necesidad de conocer la contaminación ambiental en medios terrestres ha llevado a los investigadores a utilizar otras herramientas, por ejemplo los helmintos, que se utilizan como bioindicadores de contaminación ambiental basados en su capacidad de absorción, y concentración de contaminantes del medio en su cuerpo. El uso de bioindicadores es ventajoso y económico comparado con el análisis directo de contaminantes por que solo las fracciones que están biológicamente disponibles son …

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Nuevos Registros Y Redescripción De Rhabdochona Xiphophori Caspeta-Mandujano, Moravec Y Salgado- Maldonado, 2001 (Nematoda: Rhabdochonidae) En El Estado De Hidalgo, México, Jorge Falcón-Ordaz, Scott Monks, Griselda Pulido-Flores, Christian Elizbeth Bautista-Hernández, Sarahi Hernández-Hernández Jan 2015

Nuevos Registros Y Redescripción De Rhabdochona Xiphophori Caspeta-Mandujano, Moravec Y Salgado- Maldonado, 2001 (Nematoda: Rhabdochonidae) En El Estado De Hidalgo, México, Jorge Falcón-Ordaz, Scott Monks, Griselda Pulido-Flores, Christian Elizbeth Bautista-Hernández, Sarahi Hernández-Hernández

Estudios en Biodiversidad

Teniendo en cuenta la diversidad de los ecosistemas acuáticos en México y la infinita riqueza de especies de peces en el país, la lista actual de nemátodos parásitos de peces de agua dulce en México está incompleta. Hasta la fecha en México el género Rhabdochona se encuentra registrado como parásito en una amplia gama de familias de peces de agua dulce. El objetivo del presente trabajo es redescribir ejemplares de Rhabdochona xiphophori parásita de Xiphophorus malinche colectados de dos localidades del estado de Hidalgo y compararlos morfológicamente.

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Importancia De Las Aves Ictiófagas Como Hospederos Finales De Helmintos, En Dos Lagunas Costeras Del Estado De Guerrero, México, Juan Violante-González, Griselda Pulido-Flores, Scott Monks, Agustín A. Rojas-Herrera, Miguel A. Melo-García, Sergio García-Ibáñez, Edgar León Esparza-Ibarra, Edvino Larumbe-Morán, Jonatan Carbajal-Violante Jan 2015

Importancia De Las Aves Ictiófagas Como Hospederos Finales De Helmintos, En Dos Lagunas Costeras Del Estado De Guerrero, México, Juan Violante-González, Griselda Pulido-Flores, Scott Monks, Agustín A. Rojas-Herrera, Miguel A. Melo-García, Sergio García-Ibáñez, Edgar León Esparza-Ibarra, Edvino Larumbe-Morán, Jonatan Carbajal-Violante

Estudios en Biodiversidad

Se examinó la composición y riqueza de comunidades de helmintos en tres especies de aves ictiófagas: Ardea alba, Nyctanassa violacea y Phalacrocorax brasilianus en dos lagunas costeras del estado de Guerrero, México. La helmintofauna estuvo constituida por 23 especies: 17 digéneos, un acantocéfalo, dos céstodos y tres nemátodos. Cinco especies (Ascocotyle longa, Mehrastomum minutum, Riberoia ondatrae, Southwellina hispida y Contracaecum multipapillatum) co-ocurrieron en las tres especies de aves de ambas lagunas. Los niveles de infección de un 50% de las especies identificadas, variaron significativamente entre las especies de aves y lagunas. A nivel componente, la riqueza de especies varió significativamente …

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Evaluación De Las Infracomunidades De Tres Especies De Peces En Dos Localidades De La Huasteca Hidalguense, Christian Elizbeth Bautista-Hernández, Scott Monks, Griselda Pulido-Flores Jan 2015

Evaluación De Las Infracomunidades De Tres Especies De Peces En Dos Localidades De La Huasteca Hidalguense, Christian Elizbeth Bautista-Hernández, Scott Monks, Griselda Pulido-Flores

Estudios en Biodiversidad

Uno de los problemas más severos y menos controlados en México es el gran número de especies introducidas en las cuencas del país, hecho que pone en peligro la existencia de muchas de las especies endémicas. Además, las especies introducidas pueden transportar sus parásitos, que con frecuencia afectan a las poblaciones de especies endémicas. Anteriormente se realizó un estudio de las comunidades de parásitos de tres especies de peces, dos endémicas y una exótica (Xiphophorus birchmanni, Pseudoxiphophorus bimaculata y Amatitlania nigrofasciata). En ese trabajo se realizó el análisis de éstas comunidades evaluándolas a nivel infracomunidad, además se calculó la caracterización …

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Parasitofauna De Peces De Lagunas Costeras Del Estado De Guerrero, México, Juan Violante-González, Griselda Pulido-Flores, Scott Monks, Agustín A. Rojas-Herrera, Jaime Salvador Gil-Guerrero, Sergio García-Ibáñez, Jonatan Carbajal-Violante Jan 2015

Parasitofauna De Peces De Lagunas Costeras Del Estado De Guerrero, México, Juan Violante-González, Griselda Pulido-Flores, Scott Monks, Agustín A. Rojas-Herrera, Jaime Salvador Gil-Guerrero, Sergio García-Ibáñez, Jonatan Carbajal-Violante

Estudios en Biodiversidad

No obstante que los parásitos representan un porcentaje muy importante de la biodiversidad global a nivel mundial, en muchas ocasiones son excluidos de estudios con este enfoque, debido principalmente a que han sido considerados durante muchos años, como simples agentes causantes de enfermedad. A partir de los datos obtenidos de varios estudios parasitológicos de peces y aves, efectuados en algunas lagunas costeras del estado de Guerrero a lo largo de varios años, se presenta un análisis global de la riqueza de la parasitofauna de peces, en estos altamente productivos y complejos sistemas acuáticos. La parasitofauna total estuvo constituida por 66 …

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The Functional Role Of Leaf Nutrients In An Old-Field Successional Community, Kirstin I. Duffin Jan 2015

The Functional Role Of Leaf Nutrients In An Old-Field Successional Community, Kirstin I. Duffin

Masters Theses

In functional ecology, traits that capture aspects of plant performance are used to understand how organisms interact with their environment. Leaf nutrients are an example of a functional trait that directly links to plant metabolic processes and therefore may describe plant assemblage dynamics. Multivariate leaf nutrient analyses may be used with other functional traits to understand ecological strategies because they are a direct measure of leaf metabolic processes and can describe nuances in plant allocation patterns. In this thesis, I explored (1) whether a suite of leaf nutrients (carbon, nitrogen, phosphorus, potassium, calcium, and magnesium) was related to plant growth …

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Matrix And Edge Effects On The Maintenance Of Ecological Function In An Afromontane Protected Area, Robin M. Martino Jan 2015

Matrix And Edge Effects On The Maintenance Of Ecological Function In An Afromontane Protected Area, Robin M. Martino

Antioch University Dissertations & Theses

Land use type in the human dominated matrix surrounding tropical forest can influence edge effects at the forest-matrix interface. Edge effects can alter ecological processes and impact the function of forest edge ecosystems. A key ecological process that helps maintain tropical forest and is affected by forest disturbance is seed dispersal by large, fruit eating vertebrates (frugivores). This dissertation examines how the type of vegetation in the matrix, the `soft’ edge contrast of pine plantations and the `hard’ edge contrast of tea plantations, affect seed dispersal behavior of large frugivores, and the structure and composition of tree species, in forest …

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Decadal Scale Responses Of Soil And Ecosystem Processes To Forest Restoration In Rocky Mountain Conifer Forests, Peter Ganzlin Jan 2015

Decadal Scale Responses Of Soil And Ecosystem Processes To Forest Restoration In Rocky Mountain Conifer Forests, Peter Ganzlin

Graduate Student Theses, Dissertations, & Professional Papers

Decades of fire suppression have left much of the forest in the intermountain western United States exceedingly dense, and forest restoration techniques – including thinning and prescribed fire – are increasingly being used in an attempt to mitigate the potentially disastrous effects of severe wildfire, to enhance tree growth and regeneration, and to stimulate soil nutrient cycling. While many of the short-term effects of forest restoration have been established, the long-term effects on soil biogeochemical and ecosystem processes are largely unknown. In this thesis I present two manuscripts documenting and synthesizing these long-term impacts. The first chapter focuses on the …

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Plant Functional Traits Of Dominant Native And Invasive Species In Mediterranean-Climate Ecosystems, Jennifer L. Funk, Rachel J. Standish, William D. Stock, Fernando Valladares Jan 2015

Plant Functional Traits Of Dominant Native And Invasive Species In Mediterranean-Climate Ecosystems, Jennifer L. Funk, Rachel J. Standish, William D. Stock, Fernando Valladares

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

The idea that dominant invasive plant species outperform neighboring native species through higher rates of carbon assimilation and growth is supported by several analyses of global datasets. However, theory suggests that native and invasive species occurring in low-resource environments will be functionally similar, as environmental factors restrict the range of observed physiological and morphological trait values. We measured resource-use traits in native and invasive plant species across eight diverse vegetation communities distributed throughout the five Mediterranean-climate regions, which are drought-prone and increasingly threatened by human activities including the introduction of exotic species. Traits differed strongly across the five regions. In …

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