Citations with the tag: ANIMAL orientation
Results 1 - 50
- Animal orienteering.
Curtis, Sam // Backpacker; Aug96, Vol. 24 Issue 6, p26
Focuses on animals' navigational ability. Means by which animals tell direction; Marking out a path; Homing instincts and direction sense. INSETS: Turn left at the rockies, by S. Curtis.;Beastly brief..
- Feeling the distance.
Curtis, Sam // National Wildlife (World Edition); Dec98/Jan99, Vol. 37 Issue 1, p12
Reports on findings about the ability of seals to orient themselves and find food in murky water through the use of their whiskers. Responsiveness of a seal subject to water currents while blindfolded; Hydrodynamic receptor system.
- The Magnetic Sense.
Myers, Jack // Highlights for Children; Oct99, Vol. 54 Issue 10, p24
Focuses on the ability of animals to find their way home.
- Homing in on vertebrates.
Kirschvink, Joseph L. // Nature; 11/27/1997, Vol. 390 Issue 6658, p339
Discusses research which studied rainbow trout to investigate how organisms might sense the Earth's magnetic field and use it for navigating and homing. Research by Walker et al in this issue; Special receptor cells in sensory systems; Previous research; Magnetite and magnetoreception;...
- The dynamics of long term exploration in the rat: Part II. An analytical model of the kinematic structure of rat exploratory behavior.
Tchernichovski, Ofer; Benjamini, Yoav // Biological Cybernetics; 1998, Vol. 78 Issue 6, p433
Abstract. A simple analytical model is proposed here that captures to a large extent the kinematic structure of rat exploratory behavior. Previous studies have shown that such behavior consists of regular excursions into the environment from a preferred place termed a home base. In the first...
- The dynamics of long-term exploration in the rat: Part I. A phase-plane analysis of the relationship between location and velocity.
Tchernichovski, Ofer; Benjamini, Yoav; Golani, Ilan // Biological Cybernetics; 1998, Vol. 78 Issue 6, p423
Abstract. Rat exploratory behavior consists of regular excursions into the environment from a preferred place termed a home base. A phase plane representation of excursions reveals a geometrical pattern that changes during exploration in both shape and size. We first show that with time and...
- Return to the Magic Well: Echolocation Behavior of Bats and Responses of Insect Prey.
Griffin, Donald R. // BioScience; Jul2001, Vol. 51 Issue 7, p555
Presents information on the history of study of the echolocation behavior of bats, or their use of sonar to avoid obstacles and catch flying insects and other prey. Importance of bats' ears for orientation when flying in the dark; Speculation by Hiram Maxim that bats might detect obstacles by...
- Echolocation by Insect-Eating Bats.
Schnitzler, Hans-Ulrich; Kalko, Elisabeth K. V. // BioScience; Jul2001, Vol. 51 Issue 7, p557
Presents a study which identifies four distinct functional groups of bats and differences in signal structure that correlate with the typical echolocation tasks faced by each group. Perceptual problems for foraging bats; Signals adapted for specific tasks; Narrowband and broadband signals; Long...
- Perceptive Bees, Birds, and Bacteria.
Gould, Stephen Jay // Natural History; Nov79, Vol. 88 Issue 9, p25
Investigates how creatures orient themselves within their environments in ways that humans cannot perceive. Correspondence between an organism's form and an engineer's blueprint; Magnet within the bodies of bacteria; Role of oriented motion in adaptive traits; Effects of gravity on humans and...
Gould, Stephen Jay // American Heritage Student Science Dictionary; 2009, p107
Several definitions of the term "echolocation" are presented. It refers to a sensory system in certain animals, such as bats and dolphins, in which the animals send out high-pitched sounds and use their echoes to determine the position of objects. It also refers to the use of reflected sound...
- Nature's navigators: The Feats.
Aziz, Laurel // Canadian Geographic; Jan2000, Vol. 120 Issue 1, p74
Focuses on the orienteering skills of animals. How interaction between navigational cues can influence how they are used; Tools and strategies used by animals to enhance their mobility.
- ADVANTAGES AND DISADVANTAGES OF TECHNIQUES FOR TRANSFORMING AND ANALYZING CHIROPTERAN ECHOLOCATION CALLS.
Parsons, Stuart; Boonman, Arjan M. // Journal of Mammalogy; Nov2000, Vol. 81 Issue 4, p927
Presents a study which examined the advantages and disadvantages of techniques that transform and analyze echolocation calls of bats. Materials and methods; Results and discussion; Conclusions.
- Animal behaviour: Insect orientation to polarized moonlight.
Dacke, Marie; Nilsson, Dan-Eric; Scholtz, Clarke H.; Byrne, Marcus; Warrant, Eric J. // Nature; 7/3/2003, Vol. 424 Issue 6944, p33
Moonlight, like sunlight, scatters when it strikes tiny particles in the atmosphere, giving rise to celestial polarization patterns. Here we show that an African dung beetle, Scarabaeus zambesianus, uses the polarization of a moonlit sky to orientate itself so that it can move along a straight...
- Orientation tuning of motion-sensitive neurons shaped by vertical-horizontal network interactions.
Haag, J.; Borst, A. // Journal of Comparative Physiology A: Neuroethology, Sensory, Neu; May2003, Vol. 189 Issue 5, p363
We measured the orientation tuning of two neurons of the fly lobula plate (H1 and H2 cells) sensitive to horizontal image motion. Our results show that H1 and H2 cells are sensitive to vertical motion, too. Their response depended on the position of the vertically moving stimuli within their...
- Cave birds.
Greij, Eldon // Birder's World; Oct2007, Vol. 21 Issue 5, p56
The article presents information on oilbirds. They rely on a form of sonar called echolocation to navigate in their pitch-black homes. They do not need the precise, high-frequency echolocation of bats, which capture insects, they only have to avoid walls and ceilings. Experiments have shown that...
- Geographic variation in the morphology, echolocation and diet of the little free-tailed bat, Chaerephon pumilus (Molossidae).
Aspetsberger, F.; Brandsen, Djuri; Jacobs, D. S. // African Zoology; Oct2003, Vol. 38 Issue 2, p245
The insectivorous bat Chaerephon pumilus has a wide distribution in Africa and displays considerable variation in the colour of its wings and venter. We investigated whether variation is also evident in its morphology, echolocation and diet by comparing a population of this species in Amani...
- Built-in polarizers form part of a compass organ in spiders.
Dacke, M.; Nilsson, D.-E.; Warrent, E.J.; Blest, A.D.; Land, M.F.; O'Carroll, D.C. // Nature; 9/30/1999, Vol. 401 Issue 6752, p470
Presents research on the compass organ in the spider Drassodes cupreus, where a pair of specialized secondary eyes cooperate to analyze skylight polarization. Method of action; Structural details.
- Linking of Learning Signals in Honeybee Orientation.
Bogdany, Franz Josef // Behavioral Ecology & Sociobiology; 1978, Vol. 3 Issue 4, p323
1. Honeybees link time, color, and scent together when these signals are simultaneously presented in training. 2. Presenting time and color, or time and scent, as constant signal combinations in training results in very precise orientation. When either one of the combined signals is varied,...
- VARIATION OF ECHOLOCATION CALLS OF PTERONOTUS QUADRIDENS (CHIROPTERA: MORMOOPIDAE) IN CUBA.
Macías, Silvio; Mora, Emanuel C.; Gannon, William L. // Journal of Mammalogy; Nov2003, Vol. 84 Issue 4, p1428
Echolocation calls were recorded from Pteronotus quadridens flying in the field and in an enclosed space. In the field, search calls contained 1 or 2 harmonics. Patterns of call design show a segment of quasi--constant frequency (QCF2nd-hamonic at 81-84 kHz), followed by a downward...
- Starfish eyes show them the way home.
MacKenzie, Debora // New Scientist; 7/13/2013, Vol. 219 Issue 2925, p01
The article looks at a study by researcher Anders Garm and team on light-sensitive eye-like organs in the tips of the arms of Linckia laevigata blue sea stars, which allow the starfish to return to their home reefs when grazing.
- Juvenile Songbirds Compensate for Displacement to Oceanic Islands during Autumn Migration.
Thorup, Kasper; Ortvad, Troels Eske; Rabøl, Jørgen; Holland, Richard A.; Tøttrup, Anders P.; Wikelski, Martin // PLoS ONE; 2011, Vol. 6 Issue 3, p1
To what degree juvenile migrant birds are able to correct for orientation errors or wind drift is still largely unknown. We studied the orientation of passerines on the Faroe Islands far off the normal migration routes of European migrants. The ability to compensate for displacement was tested...
- tropisms, theory of (c. 1912) Biology/Philosophy.
Thorup, Kasper; Ortvad, Troels Eske; Rabøl, Jørgen; Holland, Richard A.; Tøttrup, Anders P.; Wikelski, Martin // Dictionary of Theories; 2002, p535
A definition of the term "theory of tropisms" is presented. It was proposed by Jacques Loeb , a physiologist and physician who was associated with the Rockefeller Institute in New York. It refers to the concept that all the activities of animals and humans are determined by tropisms, just as...
- Do Dolphins Eavesdrop on the Echolocation Signals of Conspecifics?
Gregg, Justin D.; Dudzinski, Kathleen M.; Smith, Howard V. // International Journal of Comparative Psychology; 2007, Vol. 20 Issue 1, p65
Preliminary experimental evidence shows that it is possible for an eavesdropping dolphin to discern object information from the returning echoes generated by the echolocation signals of conspecifics. Researchers have offered suggestions as to how this proposed ability may affect the behavior of...
- WEEKLY READER:.
Gregg, Justin D.; Dudzinski, Kathleen M.; Smith, Howard V. // World Almanac for Kids; 2005, p35
The article looks at the use of echolocation by bats. Some kinds of bats use echolocation to navigate in the dark and to find insects. The bats make sounds that cannot be heard by humans. A bat knows where an insect is because the bat's sounds echo, or bounce off, an insect and return to the...
- Seeing with Ears.
Ingram, Scott // Dolphins (1-59716-161-6); 2006, p22
A chapter of the book "Dolphins" is presented. It discusses the way dolphins use echoes to help them find fish and stay away from dangerous animals. Dolphins make clicking sounds which they aim with the large, rounded part of their head. The clicks bounce off objects and return to the dolphin,...
- Guiding contact by coupling the taus of gaps.
Lee, David N.; Georgopoulos, Apostolos P.; Clark, Martyn J.O.; Craig, Cathy M.; Port, Nicholas Lindman // Experimental Brain Research; Jul2001, Vol. 139 Issue 2, p151
Animals control contact with surfaces when locomoting, catching prey, etc. This requires sensorily guiding the rate of closure of gaps between effectors such as the hands, feet or jaws and destinations such as a ball, the ground and a prey. Control is generally rapid, reliable and robust, even...
- Mechanical adaptations for echolocation in the cochlea of the bat Hipposideros lankadiva.
Foeller, Elisabeth; K�ssl, Manfred // Journal of Comparative Physiology A: Sensory, Neural & Behaviora; Sep2000, Vol. 186 Issue 9, p859
The cochlear mechanics of bats with long constant-frequency components in their echolocation calls are sharply tuned to the dominant second harmonic constant frequency. Hipposiderid bats employ a shorter constant-frequency call component whose frequency is less stable than in...
Foeller, Elisabeth; K�ssl, Manfred // American Heritage Student Science Dictionary; 2009, p351
A definition for "tropism " is presented. It refers the growth or movement of a plant or animal toward or away from an external stimulus, such as light, heat, or gravity.
- Flight first, sound later.
Foeller, Elisabeth; K�ssl, Manfred // Australian Life Scientist; 2/15/2008, p1
Fossil find suggests bats evolved the ability to fly before developing echolocation.
- Effects of a "Permanent" Clock-Shift on the Orientation of Young Homing Pigeons.
Wiltschko, Wolfgang; Wiltschko, Roswitha; Keeton, William T. // Behavioral Ecology & Sociobiology;
1. Young pigeons kept under a 6-h-slow photoperiod from the time of weaning and allowed to see the sun during the afternoon (=their subjective morning) did not depart from test release sites with the 90Â° deflection ordinarily seen in 6-h-slow clock-shifted pigeons; their orientation did not...
- In the mating system of the bat Saccopteryx bilineata, bioacoustic constraints impede male eavesdropping on female echolocation calls for their surveillance.
Hoffmann, F. F.; Hejduk, J.; Caspers, B.; Siemers, B. M.; Voigt, C. C. // Canadian Journal of Zoology; Aug2007, Vol. 85 Issue 8, p863
At night, bats utter loud echolocation calls at high repetition rates that may reveal the location and current behaviour of callers to eavesdropping bats. Given the strong attenuation of echolocation calls, we predicted that territorial males of a harem-polygynous species ought to forage at...
- Laboratory observations of habitat selection in aestivating and active adult sea cucumber Apostichopus japonicus.
Yamana, Yusuke; Hamano, Tatsuo; Goshima, Seiji // Fisheries Science; Sep2009, Vol. 75 Issue 5, p1097
In order to verify which factors affect habitat selection for aestivating and in the active adult Apostichopus japonicus, animals were tested for their selection of attachment site in an experimental device (1-m pipes) in which the perceived environmental stimuli (light intensity, degree of...
- Pigeon Homing: Deprivation of Olfactory Information Does Not Affect the Deflector Effect.
Kiepenheuer, J. // Behavioral Ecology & Sociobiology; Nov1979, Vol. 6 Issue 1, p11
1. Pigeons reared in deflector cages show on release a very pronounced bias of their mean vanishing bearings in the predicted direction, confirming the results of Baldaccini et al. (1975a). The angle of deviation though is only about half the angle of actual wind deflection in the cages. The...
- Orientation by Jumping Spiders of the Genus Phidippus (Araneae: Salticidae) During the Pursuit of Prey.
Hill, David Edwin // Behavioral Ecology & Sociobiology; 1979, Vol. 5 Issue 3, p301
1. Jumping spiders of the genus Phidippus tend to occupy waiting positions on plants during the day. From such reconnaissance positions, the spiders often utilize an indirect route of access (detour) to attain a position from which sighted prey (the primary objective of pursuit) can be captured....
- Spontaneous preferences for magnetic compass direction in the American red-spotted newt, Notophthalmus viridescens (Salamandridae, Urodela).
Schlegel, Peter A. // Journal of Ethology; Jul2007, Vol. 25 Issue 2, p177
In addition to other sensory modalities, migratory vertebrates are able to use the earthsâ€™ magnetic field for orientation and navigation. The magnetic cue may also serve as a reference for other orientation mechanisms. In this study, significant evidence is shown that, even in darkness,...
- Orientation of larval and juvenile horseshoe crabs Limulus polyphemus to visual cues: Effects of chemical odors.
Medina, Julie M.; Tankersley, Richard A. // Current Zoology; 2010, Vol. 56 Issue 5, p618
Adult horseshoe crabs Limulus polyphemus have long served as models for the study of vision in marine arthropods. Yet, little is known about the ability of early life history stages to detect and respond to visual cues. We examined the visually directed movements of larvae and first stage...
- Influence of gaze and directness of approach on the escape responses of the Indian rock lizard, Psammophilus dorsalis (Gray, 1831).
Sreekar, Rachakonda; Quader, Suhel // Journal of Biosciences; Dec2013, Vol. 38 Issue 5, p829
Animals often evaluate the degree of risk posed by a predator and respond accordingly. Since many predators orient their eyes towards prey while attacking, predator gaze and directness of approach could serve as conspicuous indicators of risk to prey. The ability to perceive these cues and...
- Follow Your Beak.
Flores, Graciela // Natural History; Jun2007, Vol. 116 Issue 5, p14
The article focuses on a study by neurobiologist Gerta Fleissner and colleagues at the University of Frankfurt in Germany, which investigated the magnetic sense of homing pigeons and other birds which help them find their way home. The investigators propose that an extremely delicate arrangement...
- Motility Enhancement through Surface Modification Is Sufficient for Cyanobacterial Community Organization during Phototaxis.
Ursell, Tristan; Chau, Rosanna Man Wah; Wisen, Susanne; Bhaya, Devaki; Huang, Kerwyn Casey // PLoS Computational Biology; Sep2013, Vol. 9 Issue 9, p1
The emergent behaviors of communities of genotypically identical cells cannot be easily predicted from the behaviors of individual cells. In many cases, it is thought that direct cell-cell communication plays a critical role in the transition from individual to community behaviors. In the...
- The Brain as a Source of Selection on the Social Niche: Examples from the Psychophysics of Mate Choice in TÃºngara Frogs.
Ryan, Michael J. // Integrative & Comparative Biology; Nov2011, Vol. 51 Issue 5, p756
The main premise of this article is that various cognitive functions involved in signal analysis, memory, and decision making, all modulated by the animalâ€™s internal milieu, can generate selection for the forms of signals used in social interactions. Thus, just as an animalâ€™s view...
- A New Look at Animal Intelligence.
Greene, Kate // U.S. News Digital Weekly; 5/9/2014, Vol. 6 Issue 19, p11
The article discusses findings by researchers who took a closer look to an understanding of how animals' minds actually work. Topics covered include the researchers study of the birds' brains using positron emission tomography scans for added insight, the need to test an animal's intelligence...
- Object tracking in motion-blind flies.
Bahl, Armin; Ammer, Georg; Schilling, Tabea; Borst, Alexander // Nature Neuroscience; Jun2013, Vol. 16 Issue 6, p730
Different visual features of an object, such as its position and direction of motion, are important elements for animal orientation, but the neural circuits extracting them are generally not well understood. We analyzed this problem in Drosophila, focusing on two well-studied behaviors known as...
- Further characterization of an aversive learning task in Drosophila melanogaster: intensity of the stimulus, relearning, and use of rutabaga mutants.
Perisse, Emmanuel; Portelli, Geoffrey; Le Goas, Solène; Teste, Elsa; Le Bourg, Eric // Journal of Comparative Physiology A: Neuroethology, Sensory, Neu; Nov2007, Vol. 193 Issue 11, p1139
Various learning tasks have been described in Drosophila melanogaster, flies being either tested in groups or at the individual level. Le Bourg and Buecher (Anim Learn Behav 33:330â€“341, ) have designed a task at the individual level: photopositive flies crossing a T-maze learn to prefer...
- Object recognition by echolocation: a nectar-feeding bat exploiting the flowers of a rain forest vine.
von Helversen, D.; von Helversen, O. // Journal of Comparative Physiology A: Neuroethology, Sensory, Neu; May2003, Vol. 189 Issue 5, p327
In the bat-pollinated vine Mucuna holtonii only the first visit to a flower is rewarded with a substantial amount of nectar, which is released when a bat lands on the flower and triggers an explosion mechanism. During later visits the bats receive only small amounts of nectar. Nevertheless, the...
- Bearing selection in ball-rolling dung beetles: is it constant?
Baird, Emily; Byrne, Marcus J.; Scholtz, Clarke H.; Warrant, Eric J.; Dacke, Marie // Journal of Comparative Physiology A: Neuroethology, Sensory, Neu; Nov2010, Vol. 196 Issue 11, p801
Ball rolling in dung beetles is thought to have evolved as a means to escape intense inter- and intra-specific competition at the dung pile. Accordingly, dung beetles typically roll along a straight-line path away from the pile, this being the most effective escape strategy for transporting dung...
- And on that farm the cows face North - says Google.
Callaway, Ewen // New Scientist; 8/30/2008, Vol. 199 Issue 2671, p10
The article provides information that reveals the cows' magnetic orientation. It is found out that grazing cows tend to align north-south suggesting their sensitivity on Earth's magnetic field. Through examining the photographs of Google Earth, it was found out that cows' orientation were not...
- Echolocation Calls of Pteronotus Davyi (Chiroptera: Mormoopidae) From Panama.
Ibanez, Carlos; Guillen, Antonio // Journal of Mammalogy; Aug99, Vol. 80 Issue 3, p924
Presents a study on echolocation signals broadcast by free-flying naked-backed bats (Pteronotus davyi) from Panama. Materials and methods; Results; Discussion.
- Two-Toned Echolocation Calls From Molossus Molossus in Cuba.
Kossl, M.; Mora, E. // Journal of Mammalogy; Aug99, Vol. 80 Issue 3, p929
Presents a study on the echolocation behavior in the Cuban subspecies of Molossus molossus to investigate how search calls might be adapted to match the bat's hearing capabilities and optimize chance of detecting an insect. Materials and methods; Results; Discussion.
- Microstructure of a spatial map in the entorhinal cortex.
Hafting, Torkel; Fyhn, Marianne; Molden, Sturla; Moser, May-Britt; Moser, Edvard I. // Nature; 8/11/2005, Vol. 436 Issue 7052, p801
The ability to find one's way depends on neural algorithms that integrate information about place, distance and direction, but the implementation of these operations in cortical microcircuits is poorly understood. Here we show that the dorsocaudal medial entorhinal cortex (dMEC) contains a...
- Response to: Green Light for Nocturnally Migrating Birds.
Evans, William R. // Ecology & Society; 2010, Vol. 15 Issue 3, Special section p1
The author offers a commentary on a study about the effects of artificial light on night migrating birds. This study, claims the author, has the potential to affect conservation efforts. The sample size used to base the conclusion that red light causes disorientation is criticized. Lack of...