First description of migration and wintering home range of Gray-headed Lapwings (Vanellus cinereus) tracked with GPS-GSM satellite telemetry

The study of movement patterns and home range is fundamental in understanding the spatial requirements of animals and is important in generating information for the conservation and management of threatened species. Ndumo Game Reserve, in north-eastern KwaZulu-Natal, bordering Mozambique, has the third largest Nile crocodile (Crocodylus niloticus) population in South Africa. Movement patterns of 50 Nile crocodiles with a total length of between 202 cm and 472 cm were followed over a period of 18 months, using mark-resight, radio and satellite telemetry. The duration of radio transmitter attachment (131 ± 11.4 days) was significantly and negatively related to total length and reproductive status. Satellite transmitters failed after an average of 15 ± 12.5 days. Home range was calculated for individuals with 10 or more radio locations, spanning a period of at least 6 months. There was a significant relationship between home range size and total length, with sub-adults (1.5 m – 2.5 m) occupying smaller, more localised home ranges than adults (> 2.5 m). The largest home ranges were for adults (> 2.5 m). Home ranges overlapped extensively, suggesting that territoriality, if present, does not result in spatially discrete home ranges of Nile crocodiles in Ndumo Game Reserve during the dry season. Larger crocodiles moved farther and more frequently than smaller crocodiles. The reserve acts as a winter refuge and spring breeding site for an estimated 846 crocodiles, which also inhabit the Rio Maputo during the summer months. Nile crocodile movement out of the reserve and into the Rio Maputo starts in November and crocodiles return to the reserve as water levels in the floodplain recede in May.Conservation implications: Movement patterns of Nile crocodiles show the important role the reserve plays in the conservation of Nile crocodile populations within the greater Ndumo Game Reserve–Rio Maputo area.

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Space use of wintering waterbirds in India: Influence of trophic ecology on home-range size

Current Zoology ◽

10.1093/czoolo/60.5.616 ◽

2014 ◽

Vol 60 (5) ◽

pp. 616-621

Author(s):

Tsewang Namgail ◽

John Y. Takekawa ◽

Sivananinthaperumal Bala-Chandran ◽

Ponnusamy Sathiyaselvam ◽

Taej Mundkur ◽

...

Keyword(s):

Home Range ◽

Body Mass ◽

Feeding Habits ◽

Satellite Telemetry ◽

Space Use ◽

Home Range Size ◽

Range Size ◽

Home Ranges ◽

Biological Traits ◽

Indian States

Abstract Relationship between species’ home range and their other biological traits remains poorly understood, especially in migratory birds due to the difficulty associated with tracking them. Advances in satellite telemetry and remote sensing techniques have proved instrumental in overcoming such challenges. We studied the space use of migratory ducks through satellite telemetry with an objective of understanding the influence of body mass and feeding habits on their home-range sizes. We marked 26 individuals, representing five species of migratory ducks, with satellite transmitters during two consecutive winters in three Indian states. We used kernel methods to estimate home ranges and core use areas of these waterfowl, and assessed the influence of body mass and feeding habits on home-range size. Feeding habits influenced the home-range size of the migratory ducks. Carnivorous ducks had the largest home ranges, herbivorous ducks the smallest, while omnivorous species had intermediate home-ranges. Body mass did not explain variation in home-range size. To our knowledge, this is the first study of its kind on migratory ducks, and it has important implications for their conservation and management.

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Home Range and Excursive Post-breeding Movements of Eurasian Eagle-Owls Revealed by GPS Satellite Transmitters

Journal of Raptor Research ◽

10.3356/jrr-19-95 ◽

2021 ◽

Author(s):

Oddvar Heggøy ◽

Tomas Aarvak ◽

Peter Sjolte Ranke ◽

Roar Solheim ◽

Ingar Jostein Øien

Keyword(s):

Home Range ◽

Satellite Telemetry ◽

Age Groups ◽

Space Use ◽

Home Range Size ◽

Ranging Behavior ◽

Gps Satellite Telemetry ◽

Eagle Owl ◽

Breeding Seasons ◽

Management And Conservation

ABSTRACT Investigating space use of wild birds provides important knowledge of bird behavior and ecology, which is crucial in the management and conservation of threatened species. In the present study, we used GPS satellite telemetry to investigate space use and movements of seven adult Eurasian Eagle-Owls (Bubo bubo) in Norway during breeding and post-breeding seasons. Breeding adults had a mean home range size of 42.9 km2 (SD ± 35.1 km2; 95% kernel density estimation Had hoc), and five individuals performed long (>20 km) excursive movements away from their breeding territories during autumn. Such wide-ranging behavior has not previously been reported for adults of the nominate subspecies B. b. bubo. The study demonstrates the need to investigate seasonal movements of species, populations, and age groups even if they are considered residents, and provides valuable information for management and conservation of the Eurasian Eagle-Owl.

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Winter ranging behaviour of a greater spotted eagle (Aquila clanga) in southeast Spain during four consecutive years

Slovak Raptor Journal ◽

10.2478/srj-2014-0014 ◽

2014 ◽

Vol 8 (2) ◽

pp. 123-128 ◽

Cited By ~ 3

Author(s):

Juan M. Pérez-García ◽

Urmas Sellis ◽

Ülo Väli

Keyword(s):

Home Range ◽

Urban Areas ◽

Satellite Telemetry ◽

Water Reservoir ◽

Conservation Strategies ◽

Suitable Habitat ◽

Migratory Species ◽

Ranging Behaviour ◽

Waterfowl Hunting ◽

Irrigated Crops

Abstract Knowing the winter behaviour is essential for deciding on conservation strategies for threatened migratory species such as the greater spotted eagle (Aquila clanga). Fidelity and inter-annual variation in winter home range of an Estonian greater spotted eagle were studied during the first four years of its life by means ofGPS satellite telemetry in south-eastern Spain. Results show the eagle exploited a small area (1 2.7 km2, 95% kernel) with high inter-annual fidelity during all winter stages. The A. clanga preferred marshes and water bodies and avoided irrigated crops and urban areas. Waterfowl hunting did not show any effect on the spatial pattern of the eagle’s behaviour, although water level management in reservoirs could influence their use by the A. clanga. Our study highlights that the wintering home range may be limited to a small suitable habitat patch where human activities, especially water reservoir management, should be regulated

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Interannual home range variation, territoriality and overlap in breeding Bonelli’s Eagles (Aquila fasciata) tracked by GPS satellite telemetry

Journal of Ornithology ◽

10.1007/s10336-012-0871-x ◽

2012 ◽

Vol 154 (1) ◽

pp. 63-71 ◽

Cited By ~ 21

Author(s):

Juan Manuel Pérez-García ◽

Antoni Margalida ◽

Iván Afonso ◽

Ernesto Ferreiro ◽

Andrea Gardiazábal ◽

...

Keyword(s):

Home Range ◽

Satellite Telemetry ◽

Gps Satellite Telemetry ◽

Aquila Fasciata ◽

Range Variation

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Home range size, utilization and spatial organization of Pine Martens in Bial'owieza National Park, Poland

Mammal Review ◽

10.1046/j.1365-2907.2000.0075l.x ◽

2000 ◽

Vol 30 (3-4) ◽

pp. 232-232

Author(s):

A. Zalewski ◽

W. Jedrzejewski

Keyword(s):

Home Range ◽

National Park ◽

Spatial Organization ◽

Home Range Size ◽

Range Size ◽

Pine Martens

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Two-Dimensional Near-Infrared and Shortwave Infrared Molecular Aggregates: Taking Kasha’s Model to the Next Dimension

10.26434/chemrxiv.7699358.v3 ◽

2019 ◽

Author(s):

Arundhati Deshmukh ◽

Danielle Koppel ◽

Chern Chuang ◽

Danielle Cadena ◽

Jianshu Cao ◽

...

Keyword(s):

Near Infrared ◽

Photophysical Properties ◽

Satellite Telemetry ◽

Transition Dipole Moment ◽

Short Wave ◽

Tissue Imaging ◽

Transition Dipole ◽

Deep Tissue Imaging ◽

Excitonic States ◽

Shortwave Infrared

Technologies which utilize near-infrared (700 – 1000 nm) and short-wave infrared (1000 – 2000 nm) electromagnetic radiation have applications in deep-tissue imaging, telecommunications and satellite telemetry due to low scattering and decreased background signal in this spectral region. However, there are few molecular species, which absorb efficiently beyond 1000 nm. Transition dipole moment coupling (e.g. J-aggregation) allows for redshifted excitonic states and provides a pathway to highly absorptive electronic states in the infrared. We present aggregates of two cyanine dyes whose absorption peaks redshift dramatically upon aggregation in water from ~ 800 nm to 1000 nm and 1050 nm with sheet-like morphologies and high molar absorptivities (e ~ 105 M-1cm-1). To describe this phenomenology, we extend Kasha’s model for J- and H-aggregation to describe the excitonic states of 2-dimensional aggregates whose slip is controlled by steric hindrance in the assembled structure. A consequence of the increased dimensionality is the phenomenon of an intermediate “I-aggregate”, one which redshifts yet displays spectral signatures of band-edge dark states akin to an H-aggregate. We distinguish between H-, I- and J-aggregates by showing the relative position of the bright (absorptive) state within the density of states using temperature dependent spectroscopy. Our results can be used to better design chromophores with predictable and tunable aggregation with new photophysical properties.

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