Geomagnetic map used in sea-turtle navigation

Lohmann, Kenneth J.; Lohmann, Catherine M. F.; Ehrhart, Llewellyn M.; Bagley, Dean A.; Swing, Timothy

doi:10.1038/428909a

Cited by 268 publications

(194 citation statements)

References 8 publications

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“…Specifically, we assume 0 u x s so that the flow is between 0 and 100% of an individual's active speed: our framework also allows external currents to exceed the individual's active speed, as happens in the later application to AI homing. We take k [ ½0, 3 : upper end values generate more than half of the turns within +258 of the goal's true bearing, whereas at k ¼ 0.5 this drops to a quarter; estimates of k from the datasets in [30][31][32] all fall comfortably inside this range.…”

Section: Active and Passive Movement Parametersmentioning

confidence: 99%

Navigating the flow: individual and continuum models for homing in flowing environments

Painter

Hillen

2015

J. R. Soc. Interface.

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Navigation for aquatic and airborne species often takes place in the face of complicated flows, from persistent currents to highly unpredictable storms. Hydrodynamic models are capable of simulating flow dynamics and provide the impetus for much individual-based modelling, in which particlesized individuals are immersed into a flowing medium. These models yield insights on the impact of currents on population distributions from fish eggs to large organisms, yet their computational demands and intractability reduce their capacity to generate the broader, less parameter-specific, insights allowed by traditional continuous approaches. In this paper, we formulate an individual-based model for navigation within a flowing field and apply scaling to derive its corresponding macroscopic and continuous model. We apply it to various movement classes, from drifters that simply go with the flow to navigators that respond to environmental orienteering cues. The utility of the model is demonstrated via its application to 'homing' problems and, in particular, the navigation of the marine green turtle Chelonia mydas to Ascension Island.

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Section: Active and Passive Movement Parametersmentioning

confidence: 99%

Navigating the flow: individual and continuum models for homing in flowing environments

Painter

Hillen

2015

J. R. Soc. Interface.

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“…Sensitivity to the Earth's magnetic field has been shown in a wide variety of taxa, including turtles (Lohmann and Johnsen, 2000;Lohmann et al, 2004;Wiltschko and Wiltschko, 1995). While most studies have focused on the use of magnetic cues for goal-oriented movements, many animals also show spontaneous magnetic alignment (SMA) in which they align their body axis with respect to the Earth's magnetic field (e.g., cattle (Begall et al, 2008), foxes ( Cervený et al, 2011), dogs (Hart et al, 2013), songbirds (Stapput et al, 2008), salamanders and trout (Chew and Brown, 1989)).…”

Section: Introductionmentioning

confidence: 99%

High levels of maternally transferred mercury disrupt magnetic responses of snapping turtle hatchlings (Chelydra serpentina)

Landler

Painter

Coe

et al. 2017

Environmental Pollution

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a b s t r a c tThe Earth's magnetic field is involved in spatial behaviours ranging from long-distance migration to nongoal directed behaviours, such as spontaneous magnetic alignment (SMA). Mercury is a harmful pollutant most often generated from anthropogenic sources that can bio-accumulate in animal tissue over a lifetime. We compared SMA of hatchling snapping turtles from mothers captured at reference (i.e., low mercury) and mercury contaminated sites. Reference turtles showed radio frequency-dependent SMA along the north-south axis, consistent with previous studies of SMA, while turtles with high levels of maternally inherited mercury failed to show consistent magnetic alignment. In contrast, there was no difference between reference and mercury exposed turtles on standard performance measures. The magnetic field plays an important role in animal orientation behaviour and may also help to integrate spatial information from a variety of sensory modalities. As a consequence, mercury may compromise the performance of turtles in a wide variety of spatial tasks. Future research is needed to determine the threshold for mercury effects on snapping turtles, whether mercury exposure compromises spatial behaviour of adult turtles, and whether mercury has a direct effect on the magnetoreception mechanism(s) that mediate SMA or a more general effect on the nervous system.

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“…cognitive map | spatial memory | true navigation | movement ecology | global positioning system N avigation is critical for the survival of animals, and has been extensively studied in animals, mostly in nonmammalian species (1)(2)(3)(4)(5)(6)(7)(8)(9)(10). The most advanced type of navigation is the ability to travel directly to a certain destination from any starting point in the environment, regardless of its direction and without relying on familiar routes.…”

mentioning

confidence: 99%

Large-scale navigational map in a mammal

Tsoar

Nathan

Bartan

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

188

150

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Navigation, the ability to reach desired goal locations, is critical for animals and humans. Animal navigation has been studied extensively in birds, insects, and some marine vertebrates and invertebrates, yet we are still far from elucidating the underlying mechanisms in other taxonomic groups, especially mammals. Here we report a systematic study of the mechanisms of long-range mammalian navigation. High-resolution global positioning system tracking of bats was conducted here, which revealed high, fast, and very straight commuting flights of Egyptian fruit bats (Rousettus aegyptiacus) from their cave to remote fruit trees. Bats returned to the same individual trees night after night. When displaced 44 km south, bats homed directly to one of two goal locationsfamiliar fruit tree or cave-ruling out beaconing, route-following, or path-integration mechanisms. Bats released 84 km south, within a deep natural crater, were initially disoriented (but eventually left the crater toward the home direction and homed successfully), whereas bats released at the crater-edge top homed directly, suggesting navigation guided primarily by distal visual landmarks. Taken together, these results provide evidence for a large-scale "cognitive map" that enables navigation of a mammal within its visually familiar area, and they also demonstrate the ability to home back when translocated outside the visually familiar area.

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Geomagnetic map used in sea-turtle navigation

Cited by 268 publications

References 8 publications

Navigating the flow: individual and continuum models for homing in flowing environments

Navigating the flow: individual and continuum models for homing in flowing environments

High levels of maternally transferred mercury disrupt magnetic responses of snapping turtle hatchlings (Chelydra serpentina)

Large-scale navigational map in a mammal

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