Space-use strategies of female polar bears in a dynamic sea ice habitat

Mauritzen, Mette; Derocher, Andrew E.; Wiig, Øystein

doi:10.1139/z01-126

Cited by 140 publications

(101 citation statements)

References 60 publications

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“…This seems to be well established for herbivores, such as wildebeest, that can be migratory, nomadic or range resident [57,58]. Similar behavioral and environmental plasticity have also been reported for carnivore species such as lion [59], polar bear [60], wolverine [61], and wolf [62]. In our study, we did not identify the underlying movement behavior of non-resident jaguars, observed in jaguar collared in the Pantanal and the Caatinga biome.…”

Section: Discussionmentioning

confidence: 52%

Space Use and Movement of a Neotropical Top Predator: The Endangered Jaguar

et al. 2016

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Accurately estimating home range and understanding movement behavior can provide important information on ecological processes. Advances in data collection and analysis have improved our ability to estimate home range and movement parameters, both of which have the potential to impact species conservation. Fitting continuous-time movement model to data and incorporating the autocorrelated kernel density estimator (AKDE), we investigated range residency of forty-four jaguars fit with GPS collars across five biomes in Brazil and Argentina. We assessed home range and movement parameters of range resident animals and compared AKDE estimates with kernel density estimates (KDE). We accounted for differential space use and movement among individuals, sex, region, and habitat quality. Thirty-three (80%) of collared jaguars were range resident. Home range estimates using AKDE were 1.02 to 4.80 times larger than KDE estimates that did not consider autocorrelation. Males exhibited larger home ranges, more directional movement paths, and a trend towards larger distances traveled per day. Jaguars with the largest home ranges occupied the Atlantic Forest, a biome with high levels of deforestation and high human population density. Our results fill a gap in the knowledge of the species’ ecology with an aim towards better conservation of this endangered/critically endangered carnivore—the top predator in the Neotropics.

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Section: Discussionmentioning

confidence: 52%

Space Use and Movement of a Neotropical Top Predator: The Endangered Jaguar

et al. 2016

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“…Polar bear migration patterns typically differ between contiguous areas depending on individual strategies related to local habitat dynamics (Ferguson et al . 1998; Mauritzen, Derocher & Wiig 2001). In the Norwegian Arctic, some individuals reside within the fjords of the Svalbard Archipelago and move onto land during sea‐ice retreat in summer, while other individuals stay on sea‐ice all year and migrate seasonally following the sea‐ice retreat and advance (Mauritzen, Derocher & Wiig 2001).…”

Section: Introductionmentioning

confidence: 99%

Using satellite telemetry to define spatial population structure in polar bears in the Norwegian and western Russian Arctic

Mauritzen

Derocher

Wiig

et al. 2002

Journal of Applied Ecology

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126

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Summary1. Animal populations, defined by geographical areas within a species' distribution where population dynamics are largely regulated by births and deaths rather than by migration from surrounding areas, may be the correct unit for wildlife management. However, in heterogeneous landscapes varying habitat quality may yield subpopulations with distinct patterns in resource use and demography significant to the dynamics of populations. 2. To define the spatial population structure of polar bears Ursus maritimus in the Norwegian and western Russian Arctic, and to assess the existence of a shared population between the two countries, we analysed satellite telemetry data obtained from 105 female polar bears over 12 years. 3. Using both cluster analyses and home-range estimation methods, we identified five population units inhabiting areas with different sea-ice characteristics and prey availability. 4. The continuous distribution of polar bear positions indicated that the different subpopulations formed one continuous polar bear population in the Norwegian and western Russian Arctic. Hence, Norway and Russia have a shared management responsibility. 5. The spatial population structure identified will provide a guide for evaluating geographical patterns in polar bear ecology, the dynamics of polar bear-seal relationships and the effects of habitat alteration due to climate change. The work illustrates the importance of defining population borders and subpopulation structure in understanding the dynamics and management of larger animals.

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“…Animals may track resources with nomadic movements in unpredictable environments (Korpimaki , Dean ) or migrate between seasonal ranges when resources vary predictably (Levey & Stiles , Mauritzen et al . ). Over shorter time periods and distances, adjustments in animal abundance linked to changing patterns of resource availability may reflect food search decisions made across and within habitat patches (García & Ortiz‐Pulido , Saracco et al .…”

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confidence: 97%

“…, Mauritzen et al . ), herbivores (Searle et al . ), granivores (Renton , Boyes & Perrin ), nectarivores (Cartar , Cotton , Rothenwöhrer et al .…”

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confidence: 99%

Nutrients in fruits as determinants of resource tracking by birds

Blendinger

Giannini

Zampini

et al. 2015

Ibis

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Fruit pulp is an important source of nutrients for many bird species. Fruit‐eating birds use a variety of strategies to cope with changes in the availability of fruits, exhibiting a remarkable ability to track resources. We assessed the role of nutrient availability in the fruiting environment as a factor driving resource tracking by fruit‐eating birds. Fruit consumption by the four most common frugivorous species in a 6‐ha plot in the Southern Yungas montane forest of Argentina was assessed. We determined the content of selected nutrients (soluble carbohydrates, proteins, phenols, ascorbic acid and essential minerals) in 22 fruiting plant species eaten by birds, and measured fruit–frugivore interactions and the availability of nutrients and dry fruit pulp mass over 2 years. There was strong temporal covariation in the availability of the selected nutrients in fruits across the study period. Similarly, the availability of nutrients in the fruiting environment covaried with pulp mass. Fruit consumption by the four commonest bird species and the abundance of most species were positively associated with nutrient availability and dry pulp mass. Nutrient availability was a good predictor of temporal fruit tracking by three of the four commonest frugivores. Despite large differences in particular nutrient concentrations in fruits, overall nutrient (and pulp) quantity in the fruiting environment played a greater role in fruit tracking than did the nutritional quality of individual fruits. While overall nutrient availability (i.e. across fruit) and total pulp mass were important determinants of fruit tracking, we suggest that plant species‐specific differences in fruit nutrient concentration may be important in short‐term foraging decisions involved in fruit choice and nutritional balance of birds.

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Space-use strategies of female polar bears in a dynamic sea ice habitat

Cited by 140 publications

References 60 publications

Space Use and Movement of a Neotropical Top Predator: The Endangered Jaguar

Space Use and Movement of a Neotropical Top Predator: The Endangered Jaguar

Using satellite telemetry to define spatial population structure in polar bears in the Norwegian and western Russian Arctic

Nutrients in fruits as determinants of resource tracking by birds

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