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  • 1
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    Animal migration: Catching the wave (2012)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2012-10-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fryxell, John M -- Avgar, Tal -- England -- Nature. 2012 Oct 11;490(7419):182-3. doi: 10.1038/490182a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23060184" target="_blank"〉PubMed〈/a〉
    Keywords: *Animal Migration ; Animals ; *Deer ; Food Preferences ; Norway ; Seasons
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 2
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    Resource management cycles and the sustainability of harvested wildlife populations (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-05-15
    Description: Constant harvest policies for fish and wildlife populations can lead to population collapse in the face of stochastic variation in population growth rates. Here, we show that weak compensatory response by resource users or managers to changing levels of resource abundance can readily induce harvest cycles that accentuate the risk of catastrophic population collapse. Dynamic system models incorporating this mix of feedback predict that cycles or quasi-cycles with decadal periodicity should commonly occur in harvested wildlife populations, with effort and quotas lagging far behind resources, whereas harvests should exhibit lags of intermediate length. Empirical data gathered from three hunted populations of white-tailed deer and moose were consistent with these predictions of both underlying behavioral causes and dynamical consequences.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fryxell, John M -- Packer, Craig -- McCann, Kevin -- Solberg, Erling J -- Saether, Bernt-Erik -- New York, N.Y. -- Science. 2010 May 14;328(5980):903-6. doi: 10.1126/science.1185802.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Integrative Biology, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada. jfryxell@uoguelph.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20466934" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Animals, Wild ; Behavior ; *Conservation of Natural Resources ; *Deer ; Female ; Humans ; Male ; Models, Statistical ; Norway ; Ontario ; Periodicity ; Population Density ; Population Dynamics ; Population Growth ; Public Policy ; Seasons
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    The predator-prey power law: Biomass scaling across terrestrial and aquatic biomes (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-09-05
    Description: Ecosystems exhibit surprising regularities in structure and function across terrestrial and aquatic biomes worldwide. We assembled a global data set for 2260 communities of large mammals, invertebrates, plants, and plankton. We find that predator and prey biomass follow a general scaling law with exponents consistently near (3/4). This pervasive pattern implies that the structure of the biomass pyramid becomes increasingly bottom-heavy at higher biomass. Similar exponents are obtained for community production-biomass relations, suggesting conserved links between ecosystem structure and function. These exponents are similar to many body mass allometries, and yet ecosystem scaling emerges independently from individual-level scaling, which is not fully understood. These patterns suggest a greater degree of ecosystem-level organization than previously recognized and a more predictive approach to ecological theory.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hatton, Ian A -- McCann, Kevin S -- Fryxell, John M -- Davies, T Jonathan -- Smerlak, Matteo -- Sinclair, Anthony R E -- Loreau, Michel -- New York, N.Y. -- Science. 2015 Sep 4;349(6252):aac6284. doi: 10.1126/science.aac6284. Epub 2015 Sep 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, McGill University, Montreal, Quebec H3A 1B1, Canada. i.a.hatton@gmail.com. ; Department of Integrative Biology, University of Guelph, Guelph, Ontario N1G 2W1, Canada. ; Department of Biology, McGill University, Montreal, Quebec H3A 1B1, Canada. ; Perimeter Institute for Theoretical Physics, Waterloo, Ontario N2L 2Y5, Canada. ; Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada. Tanzania Wildlife Research Institute, P.O. Box 661, Arusha, United Republic of Tanzania. ; Centre for Biodiversity Theory and Modeling, Experimental Ecology Station, CNRS, 09200 Moulis, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26339034" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biomass ; *Databases, Factual ; *Food Chain ; Invertebrates ; Mammals ; Plankton
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Environmental change and the evolution of migration (2013)
    Wiley
    In: Ecology
    Details
    Publication Date: 2013-06-21
    Description: Ecology, Volume 94, Issue 6, Page 1274-1279, June 2013.
    Print ISSN: 0012-9658
    Electronic ISSN: 1939-9170
    Topics: Biology
    Published by Wiley on behalf of The Ecological Society of America (ESA).
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  • 5
    Electronic Resource
    Electronic Resource
    Food limitation and demography of a migratory antelope, the white-eared kob (1987)
    Springer
    Oecologia 72 (1987), S. 83-91 
    Details
    ISSN: 1432-1939
    Keywords: Kobus ; Antelope ; Food-limitation ; Demography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Although it is commonly presumed that many populations of large-herbivores are limited by food availability, supporting evidence is scarce. This hypothesis was investigated in a population of over 800,000 white-eared kob in the Boma National Park region of the southern Sudan. Food availability, body condition, and mortality rates of adults and calves were measured during the dry seasons of 1982 and 1983. Sampled age distributions from both the live population and carcasses were used to calculate age-specific rates of mortality. In 1982, food supplies during the dry season were augmented by substantial rainfall, which produced regrowth of grass in areas that ordinarily had little green forage. As a result, fat reserves declined little, and rates of adult mortality showed no increasing trend. Total adult mortality was 5%. In 1983, there was no rainfall during the dry season and food intake was insufficient to meet the estimated energy requirements of kob. As a result, fat reserves declined and adult mortality rates increased fourfold. Total adult mortality was 10% (equivalent to the recruitment rate of yearling into the population). Calf mortality during the dry season was similar in both years (50%), based on field estimates of mortality rates and calf/female ratios. Lactation throughout the dry season possibly provided a buffer for calves against variations in food availability. The age structure of the live population in 1983 suggests that a drought in 1980 reduced kob numbers by 40%. These results suggest that adult survival is influenced strongly by the availability of food during the dry season. However, the duration of the dry season also plays an important role. During the dry season, declining fat reserves make an increasing proportion of the population vulnerable to mortality. As a result, even moderate droughts may lead to substantial changes in population numbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385049
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  • 6
    Electronic Resource
    Electronic Resource
    Diet choice and predator—prey dynamics (1994)
    Springer
    Evolutionary ecology 8 (1994), S. 407-421 
    Details
    ISSN: 1573-8477
    Keywords: diet choice ; initial population density ; optimal foraging ; predator—prey systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We compare the dynamics of predator-prey systems with specialist predators or adaptive generalist predators that base diet choice on energy-maximizing criteria. Adaptive predator behaviour leads to functional responses that are influenced by the relative abundance of alternate prey. This results in the per capita predation risk being positively density-dependent near points of diet expansion. For a small set of parameter values, systems with adaptive predators can be locally stable whereas systems with specialist predators would be unstable. This occurs mainly when alternate prey have low enough profitability that predators cannot sustain themselves indefinitely when feeding on alternate prey. Local stability of systems with adaptive predator behaviour is inversely related to the goodness of fit to optimal diet choice criteria. Hence, typical patterns of partial prey preference are more stabilizing than perfect optimal diet selection. Locally stable systems with adaptive predators are often globally unstable, converging on limit cycles for many initial population densities. The small range of parameter combinations and initial population densities leading to stable equilibria suggest that adaptive diet selection is unlikely to be a ubiquitous stabilizing factor in trophic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01238191
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  • 7
    Electronic Resource
    Electronic Resource
    Optimal patch use and metapopulation dynamics (1993)
    Springer
    Evolutionary ecology 7 (1993), S. 379-393 
    Details
    ISSN: 1573-8477
    Keywords: dispersal ; marginal value theorem ; predator—prey dynamics ; spatial structure ; stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We compared the metapopulation dynamics of predator—prey systems with (1) adaptive global dispersal, (2) adaptive local dispersal, (3) fixed global dispersal and (4) fixed local dispersal by predators. Adaptive dispersal was modelled using the marginal value theorem, such that predators departed patches when the instantaneous rate of prey capture was less than the long-term rate of prey capture averaged over all patches, scaled to the movement time between patches. Adaptive dispersal tended to stabilize metapopulation dynamics in a similar manner to conventional fixed dispersal models, but the temporal dynamics of adaptive dispersal models were more unpredictable than the smooth oscillations of fixed dispersal models. Moreover, fixed and adaptive dispersal models responded differently to spatial variation in patch productivity and the degree of compartmentalization of the system. For both adaptive dispersal and fixed dispersal models, localized (‘stepping-stone’) dispersal was more strongly stabilizing than global (‘island’) dispersal. Variation among predators in the probability of dispersal in relation to local prey density had a strong stabilizing influence on both within-patch and metapopulation dynamics. These results suggest that adaptive space use strategies by predators could have important implications for the dynamics of spatially heterogeneous trophic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01237869
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  • 8
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    Moving in the Anthropocene: Global reductions in terrestrial mammalian movements (2018)
    Tucker, M. A., Böhning-Gaese, K., Fagan, W. F., Fryxell, J. M., Van Moorter, B., Alberts, S. C., Ali, A. H., Allen, A. M., Attias, N., Avgar, T., Bartlam-Brooks, H., Bayarbaatar, B., Belant, J. L., Bertassoni, A., Beyer, D., Bidner, L., van Beest, F. M., Blake, S., Blaum, N., Bracis, C., Brown, D., de Bruyn, P. J. N., Cagnacci, F., Calabrese, J. M., Camilo-Alves, C., Chamaille-Jammes, S., Chiaradia, A., Davidson, S. C., Dennis, T., De; Stefano, S., Diefenbach, D., Douglas-Hamilton, I., Fennessy, J., Fichtel, C., Fiedler, W., Fischer, C., Fischhoff, I., Fleming, C. H., Ford, A. T., Fritz, S. A., Gehr, B., Goheen, J. R., Gurarie, E., Hebblewhite, M., Heurich, M., Hewison, A. J. M., Hof, C., Hurme, E., Isbell, L. A., Janssen, R., Jeltsch, F., Kaczensky, P., Kane, A., Kappeler, P. M., Kauffman, M., Kays, R., Kimuyu, D., Koch, F., Kranstauber, B., La; Point, S., Leimgruber, P., Linnell, J. D. C., Lopez-Lopez, P., Markham, A. C., Mattisson, J., Medici, E. P., Mellone, U., Merrill, E., de Miranda Mourao, G., Morato, R. G., Morellet, N., Morrison, T. A., Diaz-Munoz, S. L., Mysterud, A., Nandintsetseg, D., Nathan, R., Niamir, A., Odden, J., OHara, R. B., Oliveira-Santos, L. G. R., Olson, K. A., Patterson, B. D., Cunha de Paula, R., Pedrotti, L., Reineking, B., Rimmler, M., Rogers, T. L., Rolandsen, C. M., Rosenberry, C. S., Rubenstein, D. I., Safi, K., Saïd, S., Sapir, N., Sawyer, H., Schmidt, N. M., Selva, N., Sergiel, A., Shiilegdamba, E., Silva, J. P., Singh, N., Solberg, E. J., Spiegel, O., Strand, O., Sundaresan, S., Ullmann, W., Voigt, U., Wall, J., Wattles, D., Wikelski, M., Wilmers, C. C., Wilson, J. W., Wittemyer, G., Zieba, F., Zwijacz-Kozica, T., Mueller, T.
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-01-26
    Description: Animal movement is fundamental for ecosystem functioning and species survival, yet the effects of the anthropogenic footprint on animal movements have not been estimated across species. Using a unique GPS-tracking database of 803 individuals across 57 species, we found that movements of mammals in areas with a comparatively high human footprint were on average one-half to one-third the extent of their movements in areas with a low human footprint. We attribute this reduction to behavioral changes of individual animals and to the exclusion of species with long-range movements from areas with higher human impact. Global loss of vagility alters a key ecological trait of animals that affects not only population persistence but also ecosystem processes such as predator-prey interactions, nutrient cycling, and disease transmission.
    Keywords: Ecology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Why are we not evaluating multiple competing hypotheses in ecology and evolution? (2017)
    Royal Society
    Details
    Publication Date: 2017-01-13
    Description: The use of multiple working hypotheses to gain strong inference is widely promoted as a means to enhance the effectiveness of scientific investigation. Only 21 of 100 randomly selected studies from the ecological and evolutionary literature tested more than one hypothesis and only eight tested more than two hypotheses. The surprising rarity of application of multiple working hypotheses suggests that this gap between theory and practice might reflect some fundamental issues. Here, we identify several intellectual and practical barriers that discourage us from using multiple hypotheses in our scientific investigation. While scientists have developed a number of ways to avoid biases, such as the use of double-blind controls, we suspect that few scientists are fully aware of the potential influence of cognitive bias on their decisions and they have not yet adopted many techniques available to overcome intellectual and practical barriers in order to improve scientific investigation.
    Keywords: ecology, evolution
    Electronic ISSN: 2054-5703
    Topics: Natural Sciences in General
    Published by Royal Society
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  • 10
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    Calcium interacts with temperature to influence Daphnia movement rates (2016)
    Royal Society
    Details
    Publication Date: 2016-12-09
    Description: Predicting the ecological responses to climate change is particularly challenging, because organisms might be affected simultaneously by the synergistic effects of multiple environmental stressors. Global warming is often accompanied by declining calcium concentration in many freshwater ecosystems. Although there is growing evidence that these changes in water chemistry and thermal conditions can influence ecosystem dynamics, little information is currently available about how these synergistic environmental stressors could influence the behaviour of aquatic organisms. Here, we tested whether the combined effects of calcium and temperature affect movement parameters (average speed, mean turning frequency and mean-squared displacement) of the planktonic Daphnia magna , using a full factorial design and exposing Daphnia individuals to a range of realistic levels of temperature and calcium concentration. We found that movement increased with both temperature and calcium concentration, but temperature effects became considerably weaker when individuals were exposed to calcium levels close to survival limits documented for several Daphnia species, signalling a strong interaction effect. These results support the notion that changes in water chemistry might have as strong an effect as projected changes in temperature on movement rates of Daphnia , suggesting that even sublethal levels of calcium decline could have a considerable impact on the dynamics of freshwater ecosystems.
    Keywords: behaviour, physiology, ecology
    Electronic ISSN: 2054-5703
    Topics: Natural Sciences in General
    Published by Royal Society
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