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Articles 1291 - 1320 of 2030
Full-Text Articles in Other Animal Sciences
A Contribution To The Bats Inhabiting Arid Steppe Habitats In Central Mongolia, Nyambayar Batbayar, Ariunbold Jargalsaikhan, Sukhchuluun Gansukh
A Contribution To The Bats Inhabiting Arid Steppe Habitats In Central Mongolia, Nyambayar Batbayar, Ariunbold Jargalsaikhan, Sukhchuluun Gansukh
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Bats of the steppe habitat require particular attention in Mongolia because of increasingly frequent droughts and the looming specter of global warming which could have a devastating impact on their population. Especially the bats in arid steppe region lack of water resources. All bat species we trapped in Erdenesant, Tov aimag, were using hand dug wells as water source indicating the significance of water availability. Many wells have been dried out or polluted in Mongolia in recent years due to warming effect of climate change and artisanal mining activities, but the extent of their impacts on bat populations have to …
Einige Bemerkungen Zur Biologie Der Wüstenkröte (Bufo Raddei), Ellen Driechciarz, René Driechciarz
Einige Bemerkungen Zur Biologie Der Wüstenkröte (Bufo Raddei), Ellen Driechciarz, René Driechciarz
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Some localities in the Taatsyn river in the valley of the Great Lakes in the South of Changaj in Mongolia were found to harbor Bufo raddei. The authors collected data on population density and tadpole holes of the larvae, collected for the first time from this Asian amphibian species.
Betr.: Schutz Des Wildesels/Kulans (Equus H. Hemionus) In Der Mongolei [Letter], Annegret Stubbe, Michael Stubbe
Betr.: Schutz Des Wildesels/Kulans (Equus H. Hemionus) In Der Mongolei [Letter], Annegret Stubbe, Michael Stubbe
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Letter to R. Grube of Deutschen Bahn AG in Berlin, Germany, asking for dispensation as the authors attempted to relocate a herd of wild asses (Equus h. hemionus) from a site in Mongolia where they would in harm's way due to development.
Do Nest Materials And Nest Substrates Affect The Breeding Of Buteo Hemilasius In The Mongolian Steppe?, Sundev Gombobaatar, B. Odkhuu, Yosef Reuvan, B. Gantulga, B. Amartuvshin, D. Usukhjargal
Do Nest Materials And Nest Substrates Affect The Breeding Of Buteo Hemilasius In The Mongolian Steppe?, Sundev Gombobaatar, B. Odkhuu, Yosef Reuvan, B. Gantulga, B. Amartuvshin, D. Usukhjargal
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Upland buzzards occur across Mongolia excluding lush taiga forest and breeds from the Mongolian Altai mountains to the western foothills of the Great Khyangan Mountains. Our field work was conducted during the breeding season of the species in Mongolia from 2001 to 2007. Nest materials of the studied nests contained natural (twigs of elm tree, shrubs, tail, and mane of horse, hair of cows, fur of sheep, goats and camels), and artificial or man-made (cotton, plastic bags, wires, cables, and others) materials. Contents of the nesting materials of the species were differed by location, region and breeding pair’s behavior. A …
Das Baikalo-Mongolische Übergangsgebiet Und Seine Bedeutung Für Die Dynamik Der Avifauna Der Baikalgrabenzone, Juri Durnev, Marina Sonina
Das Baikalo-Mongolische Übergangsgebiet Und Seine Bedeutung Für Die Dynamik Der Avifauna Der Baikalgrabenzone, Juri Durnev, Marina Sonina
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
The „Baikalgrabenzone“ or Tunka valley is the area between the lake Chubsugul in the Southwest and the bassin of the river Oljekma in the Northeast. It’s an important biogeograhic region. Some bird species are immigrating from Mongolia in this area, some other species are disapeared here. In the ornithofauna can be distinguished ten types of zoogeographic origin.
Paleo-Environmental Changes In The Uvs Nuur Basin (Northwest-Mongolia), Michael Walther
Paleo-Environmental Changes In The Uvs Nuur Basin (Northwest-Mongolia), Michael Walther
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Geomorphological, geochemical, sedimentological and palynological results are presented against the background of palaeoclimatic changes during the past 15,000 years, yielding a chrono-, bio- and morphostratigraphical model of landscape evolution in the region of northern Central Asia. Holocene and Late-Glacial climatic fluctuations there are shown to correlate well with conditions in central Europe. Particular attention is given to the importance of the palaeoclimatic interpretation of lake Basin sediments when reconstructing the palaeoenvironment.
Water Use Of Asiatic Wild Asses In The Mongolian Gobi, Petra Kaczensky, V. Dresley, D. Vetter, H. Otgonbayar, C. Walzer
Water Use Of Asiatic Wild Asses In The Mongolian Gobi, Petra Kaczensky, V. Dresley, D. Vetter, H. Otgonbayar, C. Walzer
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Water is a key resource for most large bodied mammals in the world’s arid areas. With the growing human population, access to water for wildlife often becomes compromised. Equids are typical inhabitants of semi-arid to arid rangelands and need regular access to fresh water. However, their water needs are difficult to study under free-ranging conditions. In this study we investigated Asiatic wild ass (Equus hemionus) use of permanent water points in the Great Gobi B Strictly Protected Area (SPA) in south-western Mongolia. We combined observational data from one specific water point with high frequency GPS location data from …
The Use Of High Frequency Gps Data To Classify Main Behavioural Categories In A Przewalski’S Horse In The Mongolian Gobi, Petra Kaczensky, Klaus Huber
The Use Of High Frequency Gps Data To Classify Main Behavioural Categories In A Przewalski’S Horse In The Mongolian Gobi, Petra Kaczensky, Klaus Huber
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Behavioral observations of free ranging animals can provide important insight into many aspects of their biology but are not without problems. The recent development of GPS technology allows to remotely collect high precision location data at fixed intervals. We tested whether it is possible to classify the behavior of a Przewalski’s horse in the Mongolian Gobi into Resting, Grazing and Moving based on GPS locations collected at 15 minute intervals by comparing GPS data with direct observations. Although behavioral categories lasting for 15 minutes could by fairly reliably separated based on the distances covered between successive fixes, almost half the …
Ectoparasites Of Bats In Mongolia (Ischnopsyllidae, Nycteribiidae, Cimicidae And Spinturnicidae), Ingo Sceffler, Dietrich Dolch, Jargalsaikhan Ariunbold, Nyamsuren Batsajchan, Andreas Abraham, Klaus Thiele
Ectoparasites Of Bats In Mongolia (Ischnopsyllidae, Nycteribiidae, Cimicidae And Spinturnicidae), Ingo Sceffler, Dietrich Dolch, Jargalsaikhan Ariunbold, Nyamsuren Batsajchan, Andreas Abraham, Klaus Thiele
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
For large parts of the world, the knowledge of bat ectoparasites is still scanty. Regarding Mongolia, only few studies exist to date. This paper analyzes results from extensive captures between 2005-2008, carried out in different sites of Mongolia. Discussed ectoparasites include bat fleas, (Ischnopsyllidae), bat flies (Nycteribiidae), and bat bugs (Cimicidae) and spinturnicid mites (Spinturnicidae). A number of species found in this study were new records for Mongolia, and for many species additional sites were reported. For some bat species, the spectrum and frequency of larger ectoparasites could be determined for the first time.
The Institute For Raptor Studies Expeditions In Mongolia, 1994-2000, David H. Ellis
The Institute For Raptor Studies Expeditions In Mongolia, 1994-2000, David H. Ellis
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
In 1994, 1995, 1997, 1998, and 2000, I led small teams of biologists across Mongolia in search of Saker falcon (Falco cherrug Gray) and golden eagle (Aquila chrysaetos) eyries. We also counted raptors along our march route during the first three years. These expeditions documented: (1) occupancy and productivity rates, and described eyrie sites, for Saker falcons (150 territories, 182 eyries) and golden eagles (27 known breeding territories), (2) mortality of Sakers and ipland buzzards (Buteo hemilasius) due to entanglement with trash in nests and loss of golden eagle eggs due to concealment by trash in nests, …
Current State Of Ixodidae Research In Mongolia, Daniel Kiefer, K. Pfister, D. Tserennorov, G. Bolormaa, D. Otgonbaatar, Ravčigijn Samjaa, E. G. Burmeister, Mathias S. Kiefer
Current State Of Ixodidae Research In Mongolia, Daniel Kiefer, K. Pfister, D. Tserennorov, G. Bolormaa, D. Otgonbaatar, Ravčigijn Samjaa, E. G. Burmeister, Mathias S. Kiefer
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Our research presents the Ixodidae-fauna in Mongolia. The current taxonomic state in Mongolia shows 19 Ixodidae taxa extracted in 308 locations from 115 bird and mammal species. In 1980, the species Ixodes persulcatus SCHULZE, 1930 and Ixodes berlesei Birula, 1895 were detected in Inget Tolgoi and Ixodes laguri OLENEV, 1929 on Meriones unguiculatus 10 km southeast of Ulaanbaatar for the first time. In 2000 the species Haemaphysalis concinna Koch, 1844 was detected in the Selenge-river area and Argas (Argas) vulgaris FILIPPOVA, 1961 was detected in the Gobi area. From the collection of M. and A. STUBBE 1 N …
Distribution Of Fleas (Siphonaptera) In Bird-Nests, Bird Siphonaptera On Mammalia And The Medical Importance Of Interspecific Flea Transmission In Mongolia, Daniel Kiefer, K. Pfister, D. Tserennorov, D. Otgonbaatar, Ravčigijn Samjaa, D. Sumjaa, E. G. Burmeister, Mathias S. Kiefer
Distribution Of Fleas (Siphonaptera) In Bird-Nests, Bird Siphonaptera On Mammalia And The Medical Importance Of Interspecific Flea Transmission In Mongolia, Daniel Kiefer, K. Pfister, D. Tserennorov, D. Otgonbaatar, Ravčigijn Samjaa, D. Sumjaa, E. G. Burmeister, Mathias S. Kiefer
Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298
Starting in the 1960s of the last century a huge amount of material from mammals and birds was collected in Mongolia. The according results were published in Erforschung biologischer Ressourcen der Mongolei, Volume 1-10, and represented on conferences in Halle, Moscow, Irkutsk, Ulaanbaatar, Bratislava and the Entomological Review St. Petersburg.
A big part of the collected material consisted of ectoparasites analyzed by experts from Mongolia, Germany, England, Russia, Poland, Czech Republic, and Slovakia resulting in newly described species along with zoogeographical and ecological profiles.
During the years 1974-2007 material from 321 nests of 38 bird taxa were obtained. 157 …
The Differential Roles Of D-Pax2 Variants In Regulating Drosophila Eye And Bristle Development, Colin J. O’Shea
The Differential Roles Of D-Pax2 Variants In Regulating Drosophila Eye And Bristle Development, Colin J. O’Shea
Honors Theses
The ability to appropriately interact with the environment is crucial to an organism’s survival. The establishment of functional sensory systems, such as the bristles and eyes in Drosophila, is a critical event during the development of the organism. The transcription factor D Pax2 is involved in the differentiation of the shaft and glial cells in the developing bristle (Kavaler et al., Dev, 126:2261-2272, 1999) and of the cone and primary pigment cells in the developing eye (Fu and Noll, Genes Dev, 11:389-405, 1997). How D-Pax2 contributes to distinct differentiative pathways in different cell types is not known. Recent work by …
Conservation Status And Habitat Use Of The West Virginia Spring Salamander (Gyrinophilus Subterraneus) And Spring Salamander (G. Porphyriticus) In General Davis Cave, Greenbrier Co., West Virginia, Matthew L. Niemiller, Michael S. Osbourn, Dante B. Fenolio, Thomas K. Pauley, Brian T. Miller, John R. Holsinger
Conservation Status And Habitat Use Of The West Virginia Spring Salamander (Gyrinophilus Subterraneus) And Spring Salamander (G. Porphyriticus) In General Davis Cave, Greenbrier Co., West Virginia, Matthew L. Niemiller, Michael S. Osbourn, Dante B. Fenolio, Thomas K. Pauley, Brian T. Miller, John R. Holsinger
Biological Sciences Faculty Publications
The West Virginia Spring Salamander (Gyrinophilus subterraneus) is one of four obligate cave-dwelling species of plethodontid salamanders found east of the Mississippi River in the United States. This species is endemic to a single cave system; General Davis Cave, in Greenbrier Co., West Virginia, where it is syntopic with the closely-related Spring Salamander (G. porphyriticus). Accordingly, the West Virginia Spring Salamander is a species of critical conservation concern. Because of it's conservation status and lack of data regarding the ecology and life history, particularly about population trends, we present data on relative abundance of and habitat …
Laterality Enhances Cognition In Australian Parrots, Maria Magat, Culum Brown
Laterality Enhances Cognition In Australian Parrots, Maria Magat, Culum Brown
Sentience Collection
Cerebral lateralization refers to the division of information processing in either hemisphere of the brain and is a ubiquitous trait among vertebrates and invertebrates. Given its widespread occurrence, it is likely that cerebral lateralization confers a fitness advantage. It has been hypothesized that this advantage takes the form of enhanced cognitive function, potentially via a dual processing mechanism whereby each hemisphere can be used to process specific types of information without contralateral interference. Here, we examined the influence of lateralization on problem solving by Australian parrots. The first task, a pebble-seed discrimination test, was designed for small parrot species that …
Student Sample Perceptions Of Organic Food Products And Buying Habits, Alycia M. Deus
Student Sample Perceptions Of Organic Food Products And Buying Habits, Alycia M. Deus
Agricultural Education and Communication
The purposes of this senior project were to identify college students’ perceptions and knowledge of organic food. This study also focuses on the respondents’ purchasing and budgeting of organic food. This information is essential to inform farmers and ranchers because it serves as an indicator of future market’s demands.
A thirteen item questionnaire was distributed to sixty-five students attending California Polytechnic State University, San Luis Obispo, enrolled in either Agricultural Education and Communication courses or Agricultural Business courses. Both upper and lower division classes were surveyed. The questionnaires were distributed and collected from June 2, 2009 to June 4, 2009. …
Economic Contribution Of The Agricultural Sector To The Arkansas Economy In 2007 And Revised Estimates For 2006, Nathan Kemper, Jennie Popp, Wayne Miller
Economic Contribution Of The Agricultural Sector To The Arkansas Economy In 2007 And Revised Estimates For 2006, Nathan Kemper, Jennie Popp, Wayne Miller
AAES Research Reports and Research Bulletins
This report is the fourth in a series of reports examining agriculture’s economic contribution on the Arkansas economy. Utilizing data from the United States Bureau of Economic Analysis, USDA Economics Research Service, USDA National Agricultural Statistics Service, and Minnesota IMPLAN Group, Inc., the economic contribution of agriculture on the Arkansas economy was estimated for the most recent year available, 2007. Gross Domestic Product (GDP) by State information for Arkansas was compared with those of other states in the southeast U.S. to give a measure of the relative importance of agriculture in Arkansas. The total economic contribution of agriculture (direct, indirect, …
Creating A Rabbitry For A High School Agricultural Program: A Guide For The Approval Process And Materials Required, Anne Marie Katuin
Creating A Rabbitry For A High School Agricultural Program: A Guide For The Approval Process And Materials Required, Anne Marie Katuin
Agricultural Education and Communication
The proposal for a rabbitry to be added to the campus of Liberty High School in Golden Valley Unified School District in the designated agricultural area was proposed to the agricultural teacher and site administration for the high school. A floor plan was designed to fit the needs of a small rabbit breeding operation for the use of the LHS FFA students who wished to have a breeding or meat rabbit SAE.
Guidelines and plans were created in order to help an agricultural teacher or community member go through the previously mentioned approval process if they were to want to …
Sim-Plete Feeding Trial, Kelsey Johnson
Sim-Plete Feeding Trial, Kelsey Johnson
Animal Science
A. An internship with ENI will offer an opportunity to work in the field with horse owners, feeds, marketing, and nutrition. I will be assisting in the placement of a product in the field and evaluating response. It is the first step in evaluating if this product is an appropriate and marketable product.
B. The responsibilities will be to place a new equine feed product with 10-15 horse owners (approximately 30-45 horses) and measure customer response and potential marketability of the product. Including:
- Delivery of the product
- Creation of Questionnaires (one will be given before the owners begin feeding the …
Conservation Genetics And Systematics Of Several Turtles Species In The Southeastern United States, Joshua Robert Ennen
Conservation Genetics And Systematics Of Several Turtles Species In The Southeastern United States, Joshua Robert Ennen
Dissertations
Chelonians (i.e., turtles) are an imperiled group of reptiles with about 66% of the recognized species listed as threatened by the IUCN. Most chelonian species have a unique set of life history traits (i.e., longevity, delayed sexual maturity, and low juvenile survivorship), which makes their populations exceedingly sensitive to increases in adult and juvenile moralities. With numerous anthropogenic effects (e.g., habitat alteration, exploitation, and over harvesting) negatively influencing mortality rates, chelonians have experienced global precipitous declines and extinctions.
This dissertation focuses on species within two chelonian genera, Gopherus and Graptemys. Although these two genera are vastly different ecologically, they are …
Effects Of Coyote Removal On Pronghorn And Mule Deer Populations In Wyoming, Dylan Earl Brown
Effects Of Coyote Removal On Pronghorn And Mule Deer Populations In Wyoming, Dylan Earl Brown
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
I studied the relationship between coyote (Canis latrans) removal and pronghorn (Antilocapra americana) and mule deer (Odocoileus hemionus) density and fawn:doe ratios in southwest Wyoming and northeast Utah in 2007 and 2008. Coyote removal variables studied included the number of coyotes removed, ground hours worked, total hours worked, coyotes removed/aerial gunning hour, coyotes removed/ground work hour, and coyotes removed/total effort hour. None of the variables explained changes observed in fawn:doe ratios of pronghorn or mule deer. The number of coyotes removed, ground hours worked, total hours worked, and coyotes removed/aerial gunning hour were positively …
Investigation Of Van Gogh-Like 2 Mrna Regulation And Localisation In Response To Nociception In The Brain Of Adult Common Carp (Cyprinus Carpio), Siobhan C. Reilly, Anja Kipar, David J. Hughes, John P. Quinn, Andrew R. Cossins, Lynne U. Sneddon
Investigation Of Van Gogh-Like 2 Mrna Regulation And Localisation In Response To Nociception In The Brain Of Adult Common Carp (Cyprinus Carpio), Siobhan C. Reilly, Anja Kipar, David J. Hughes, John P. Quinn, Andrew R. Cossins, Lynne U. Sneddon
Veterinary Science and Medicine Collection
The Van Gogh-like 2 (vangl2) gene is typically associated with planar cell polarity pathways, which is essential for correct orientation of epithelial cells during development. The encoded protein of this gene is a transmembrane protein and is highly conserved through evolution. Van Gogh-like 2 was selected for further study on the basis of consistent regulation after a nociceptive stimulus in adult common carp and rainbow trout in a microarray study. An in situ hybridisation was conducted in the brain of mature common carp (Cyprinus carpio), 1.5 and 3 h after a nociceptive stimulus comprising of an acetic acid injection to …
Assessing Animal Welfare: Different Philosophies, Different Scientific Approaches, David Fraser
Assessing Animal Welfare: Different Philosophies, Different Scientific Approaches, David Fraser
Assessment of Animal Welfare Collection
Attempts to improve animal welfare have commonly centered around three broad objectives: (1) to ensure good physical health and functioning of animals, (2) to minimize unpleasant ‘‘affective states’’ (pain, fear, etc.) and to allow animals normal pleasures, and (3) to allow animals to develop and live in ways that are natural for the species. Each of these objectives has given rise to scientific approaches for assessing animal welfare. An emphasis on health and functioning has led to assessment methods based on rates of disease, injury, mortality, and reproductive success. An emphasis on affective states has led to assessment methods based …
The Development And Role Of Peripheral Auditory Structures In Otocinclus Affinis, Sri Kiran Kumar Reddy Botta
The Development And Role Of Peripheral Auditory Structures In Otocinclus Affinis, Sri Kiran Kumar Reddy Botta
Masters Theses & Specialist Projects
Loricariidae is a very diverse family of catfishes found primarily in the Amazon River basin. These catfishes have a unique characteristic feature of having fenestrae (holes) in the skull region (compound pterotic bone) adjacent to their bi-lobed swim bladder. Since the swim bladders and the compound pterotic may act as an external ear for hearing in this taxon, I hypothesized that these swim bladders structures have an acoustical functional in the loricariid Otocinclus affinis. In order to understand the development of these structures in O. affinis, I first monitored the ontogeny of the compound pterotic bone by clearing …
Genetic Relationship Between Longevity And Objectively Or Subjectively Assessed Performance Traits In Sheep Using Linear Censored Models, W. Mekkaway, Rainer Roehe, Ronald M. Lewis, M. H. Davies, L. Bünger, G. Simm, W. Haresign
Genetic Relationship Between Longevity And Objectively Or Subjectively Assessed Performance Traits In Sheep Using Linear Censored Models, W. Mekkaway, Rainer Roehe, Ronald M. Lewis, M. H. Davies, L. Bünger, G. Simm, W. Haresign
Department of Animal Science: Faculty Publications
Genetic parameters of longevity in crossbred mule ewes, and genetic relationships among longevity, growth, body composition, and subjectively assessed traits on mule lambs and ewes have been estimated using Bayesian linear censored models. Additionally, the genetic associations between longevity and culling reasons were examined. Data comprised 1,797 observations of mule ewes for longevity, culling reasons, growth, body composition, mouth scores, and type traits. Longevity was defined as the time (in years) from 2 yr of age (the age at first lambing of most ewes) to culling or death. Censored data (i.e., observations for which only the lower bound of the …
Pain Perception In Fish: Indicators And Endpoints, Lynne U. Sneddon
Pain Perception In Fish: Indicators And Endpoints, Lynne U. Sneddon
Aquaculture Collection
Recent evidence has shown that fish display aversive behavioral and physiological reactions and a suspension of normal behavior in response to noxious stimuli that cause pain in other animals and humans. In addition to these behavioral responses, scientists have identified a peripheral nociceptive system and recorded specific changes in the brain activity of fish during noxious stimulation. As a result of these observations teleost fish are now considered capable of nociception and, in some opinions, pain perception. From both an experimental and an ethical perspective, it is important that scientists be able to assess possible pain and minimize discomfort that …
Unlv Magazine, Matthew K. Jacobsen, Holly Ivy De Vore, Lisa Arth, Cate Weeks, Greg Lacour, Tony Allen, Afsha Bawany, Barbara Cloud, Gian Galassi, Phil Hagen, Karyn S. Hollingsworth, Michelle Mouton, Erin O'Donnell
Unlv Magazine, Matthew K. Jacobsen, Holly Ivy De Vore, Lisa Arth, Cate Weeks, Greg Lacour, Tony Allen, Afsha Bawany, Barbara Cloud, Gian Galassi, Phil Hagen, Karyn S. Hollingsworth, Michelle Mouton, Erin O'Donnell
UNLV Magazine
No abstract provided.
Migration Dynamics Of The Northern Saw-Whet Owl In The Piedmont, Mountain, And Coastal Plain Provinces Of Virginia, Kyle E. Van Althuis
Migration Dynamics Of The Northern Saw-Whet Owl In The Piedmont, Mountain, And Coastal Plain Provinces Of Virginia, Kyle E. Van Althuis
Senior Honors Theses
The Northern Saw-whet Owl (Aegolius acadicus) is a small common owl of which little is known. The saw-whet’s migration dynamics are particularly shrouded in mystery due to the secretive nature of this owl. This study examined data obtained by capturing owls with mist nets in order to better understand volume, timing, sex differences and age differences in migration in the Piedmont province of Virginia for 2002-2007. Comparative owl capture data from two other physiographic regions (Mountain and Coastal Plain) were also examined.
Migration flight volume was highest in the Mountain province and lowest in the Coastal Plain, while movements were …
Response To Displaced Neighbours In A Territorial Songbird With A Large Repertoire, Elodie F. Briefer, Thierry Aubin, Fanny Rybak
Response To Displaced Neighbours In A Territorial Songbird With A Large Repertoire, Elodie F. Briefer, Thierry Aubin, Fanny Rybak
Ethology Collection
Neighbour recognition allows territory owners to modulate their territorial response according to the threat posed by each neighbour and thus to reduce the costs associated with territorial defence. Individual acoustic recognition of neighbours has been shown in numerous bird species, but few of them had a large repertoire. Here, we tested individual vocal recognition in a songbird with a large repertoire, the skylark Alauda arvensis. We first examined the physical basis for recognition in the song, and we then experimentally tested recognition by playing back songs of adjacent neighbours and strangers. Males showed a lower territorial response to adjacent neighbours …
Automatic Recognition Of Frog Calls Using A Multi-Stage Average Spectrum, Wen-Ping Chen, Song-Shyong Chen, Chun-Cheng Lin, Ya-Zhung Chen, Wen-Chih Lin
Automatic Recognition Of Frog Calls Using A Multi-Stage Average Spectrum, Wen-Ping Chen, Song-Shyong Chen, Chun-Cheng Lin, Ya-Zhung Chen, Wen-Chih Lin
Bioacoustics Collection
The automatic recognition of animal sounds is one of the powerful techniques for replacing the traditional ecological survey method that mainly depends on manpower, which is hence both costly and time consuming. This study developed an automatic frog call recognition system based on the combination of a pre-classification method of the syllable lengths and a multi-stage average spectrum (MSAS) method. In this system, the input frog syllables are first classified into one of the four groups determined by the pre-classification method according to syllable length. Then the proposed MSAS method is used to extract the standard feature template to analyze …