Juvenile Sandhill Cranes exhibit wider ranging and more exploratory movements than adults during the breeding season

Wolfson, David W.; Fieberg, John; Andersen, David E.

doi:10.1111/ibi.12786

Cited by 21 publications

(17 citation statements)

References 43 publications

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“…However, there is a suggestion of individual consistency, since the individuals with smallest and largest home ranges as immatures maintained smaller and larger home ranges as adults (Table 2 ). In many situations, breeding adults have smaller home ranges than non-breeders during part of the year because their movements are constrained by the location of their nest site 15 , 16 . Although animals in areas of higher productivity tend to have smaller home ranges 11 , 51 , this might not be the case in swampy areas.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, immature Shoebills moved consistent distances throughout the year, while adults moved smaller distances during the breeding season (May–October), particularly during the incubation and chick-rearing period (June–September). During the breeding season, adults forage close to the nest, moving smaller distances and occupying smaller home ranges 15 , 16 . Shoebills chicks hatch in June-July, and until the chicks are about 40 days old, at least one adult is constantly on the nest 37 .…”

Section: Discussionmentioning

confidence: 99%

“…The way individuals explore the environment can change as they age 14 , 15 , and recent advances in GPS tracking technology and increases in device longevity, have enabled the detailed study of individual movements for several years or even throughout lifetimes. This has unravelled differences between adults and juveniles in space use 15 , 16 , habitat selection 14 , 17 , and timing 18 – 20 and efficiency of movements 20 – 22 . Understanding the drivers of movement of long-lived birds relies on information on the spatial and temporal dynamics of movement at different ages in relation to environmental variables.…”

Section: Introductionmentioning

confidence: 99%

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Changes in surface water drive the movements of Shoebills

Acácio

Mullers

Franco

et al. 2021

Sci Rep

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Animal movement is mainly determined by spatial and temporal changes in resource availability. For wetland specialists, the seasonal availability of surface water may be a major determinant of their movement patterns. This study is the first to examine the movements of Shoebills (Balaeniceps rex), an iconic and vulnerable bird species. Using GPS transmitters deployed on six immature and one adult Shoebills over a 5-year period, during which four immatures matured into adults, we analyse their home ranges and distances moved in the Bangweulu Wetlands, Zambia. We relate their movements at the start of the rainy season (October to December) to changes in Normalized Difference Water Index (NDWI), a proxy for surface water. We show that Shoebills stay in the Bangweulu Wetlands all year round, moving less than 3 km per day on 81% of days. However, average annual home ranges were large, with high individual variability, but were similar between age classes. Immature and adult Shoebills responded differently to changes in surface water; sites that adults abandoned became drier, while sites abandoned by immatures became wetter. However, there were no differences in NDWI of areas used by Shoebills before abandonment and newly selected sites, suggesting that Shoebills select areas with similar surface water. We hypothesise that the different responses to changes in surface water by immature and adult Shoebills are related to age-specific optimal foraging conditions and fishing techniques. Our study highlights the need to understand the movements of Shoebills throughout their life cycle to design successful conservation actions for this emblematic, yet poorly known, species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Changes in surface water drive the movements of Shoebills

Acácio

Mullers

Franco

et al. 2021

Sci Rep

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“…For example, juvenile whooping cranes (Grus americana) migrate using more direct routes when flying with older individuals compared to groups consisting only of young birds (Figure 10; Mueller et al, 2013). It is unclear, however, if juveniles deviate from direct routes because of either error or exploration of unfamiliar territory (Mueller et al, 2013;Wolfson et al, 2020). Additionally, learned migratory behaviors are more flexible than genetic instructions, allowing changes in migratory patterns to spread through populations within the lifetimes of individuals.…”

Section: Social Learningmentioning

confidence: 99%

The Cognitive Ecology of Animal Movement: Evidence From Birds and Mammals

2021

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Cognition, defined as the processes concerned with the acquisition, retention and use of information, underlies animals’ abilities to navigate their local surroundings, embark on long-distance seasonal migrations, and socially learn information relevant to movement. Hence, in order to fully understand and predict animal movement, researchers must know the cognitive mechanisms that generate such movement. Work on a few model systems indicates that most animals possess excellent spatial learning and memory abilities, meaning that they can acquire and later recall information about distances and directions among relevant objects. Similarly, field work on several species has revealed some of the mechanisms that enable them to navigate over distances of up to several thousand kilometers. Key behaviors related to movement such as the choice of nest location, home range location and migration route are often affected by parents and other conspecifics. In some species, such social influence leads to the formation of aggregations, which in turn may lead to further social learning about food locations or other resources. Throughout the review, we note a variety of topics at the interface of cognition and movement that invite further investigation. These include the use of social information embedded in trails, the likely important roles of soundscapes and smellscapes, the mechanisms that large mammals rely on for long-distance migration, and the effects of expertise acquired over extended periods.

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“…As birds are such mobile organisms, these include devices that can track individuals beyond specific field research sites (satellite imagery - Borowicz et al, 2018;sophisticated Sullivan et al, 2009Sullivan et al, , 2014. They improve our understanding of avian ecology by identifying previously unknown species-habitat relationships (Jirinec et al, 2016), migratory routes (Jahn et al, 2016(Jahn et al, , 2021Stanley et al, 2012Stanley et al, , 2015, foraging areas and behaviors (including accessing microhabitat refuges - Wolfson et al, 2020), and wintering distributions (Renfrew et al, 2013). These advances facilitate discovery of species responses to global change by revealing locations outside of direct observation.…”

Section: Occurrence Data For Predictive Distribution Modellingmentioning

confidence: 99%

An introduction to predictive distribution modelling for conservation to encourage novel perspectives

MacPherson

Burgio

DeSaix

et al. 2021

Preprint

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Global change creates an urgent need to predict spatial responses of biota to support the conservation of sufficient habitat to maintain biodiversity. We present species distribution model theory and a synthesis of avian literature on approaches to collecting occurrence data, selecting explanatory variables and analytical processes currently in use to predict future distributions. We find that interpreting the validity of current predictive distributions is hindered by variation in spatio-temporal resolution of data sets that force hypothesis testing under the Grinnellian niche concept. Broadly, the capacity of species to shift their geographic ranges under land use and climate change is expected to be limited by both large scale (i.e., the physiological or fundamental niche) and small scale (i.e., the realized or tolerance niche) factors. We highlight the strengths and weaknesses of widely used explanatory variables and analytical approaches tailored to macrohabitat characteristics and the Grinnellian niche concept. This synthesis addresses if and how current approaches align with theory and makes recommendations for future directions to improve the accuracy of predictive distribution modelling.

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Juvenile Sandhill Cranes exhibit wider ranging and more exploratory movements than adults during the breeding season

Cited by 21 publications

References 43 publications

Changes in surface water drive the movements of Shoebills

Changes in surface water drive the movements of Shoebills

The Cognitive Ecology of Animal Movement: Evidence From Birds and Mammals

An introduction to predictive distribution modelling for conservation to encourage novel perspectives

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