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Capera-Aragones P, Tyson RC, Foxall E. The maximum entropy principle to predict forager spatial distributions: an alternate perspective for movement ecology. THEOR ECOL-NETH 2023. [DOI: 10.1007/s12080-023-00552-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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Spatial and temporal patterns of a pulsed resource dynamically drive the distribution of specialist herbivores. Sci Rep 2019; 9:17787. [PMID: 31780724 PMCID: PMC6882897 DOI: 10.1038/s41598-019-54297-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 10/31/2019] [Indexed: 11/14/2022] Open
Abstract
Patterns and drivers of the spatio-temporal distribution of herbivores are key elements of their ecological and evolutionary impacts on plant populations. Herbivore spatial distributions may be influenced by increased (RCH: resource concentration hypothesis) or decreased (RDH: resource dilution hypothesis) resource densities, but the effect of temporal variations in resource densities on such distributions remains poorly documented. We used a survey of a masting tree species and its seed predators in Southeastern France to address the effect of a host’s pulsed resource on the spatio-temporal distributions of highly specialized insect herbivores feeding on seeds. Variations in both resource and seed predator densities were assessed by estimating seed production and seed infestation rates in focus trees during 10 consecutive years. We found increasing seed infestation rates with decreasing host tree densities in years of low seed production, indicating a RDH pattern of seed predators. However, such pattern was not persistent in years of high seed production during which seed infestation rates did not depend on host tree densities. We showed that temporal variations in resource density can lead to transience of seed predator spatial distribution. This study highlights how predictions of plant-herbivore interactions in natural ecosystems may rely on temporal components underlying RCH and RDH hypotheses.
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Mettke-Hofmann C, Hamel PB, Hofmann G, Zenzal TJ, Pellegrini A, Malpass J, Garfinkel M, Schiff N, Greenberg R. Competition and habitat quality influence age and sex distribution in wintering rusty blackbirds. PLoS One 2015; 10:e0123775. [PMID: 25946335 PMCID: PMC4422684 DOI: 10.1371/journal.pone.0123775] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 02/28/2015] [Indexed: 11/26/2022] Open
Abstract
Bird habitat quality is often inferred from species abundance measures during the breeding and non-breeding season and used for conservation management decisions. However, during the non-breeding season age and sex classes often occupy different habitats which suggest a need for more habitat-specific data. Rusty Blackbird (Euphagus carolinus) is a forested wetland specialist wintering in bottomland hardwood forests in the south-eastern U. S. and belongs to the most steeply declining songbirds in the U.S. Little information is available to support priority birds such as the Rusty Blackbird wintering in this threatened habitat. We assessed age and sex distribution and body condition of Rusty Blackbirds among the three major habitats used by this species in the Lower Mississippi Alluvial Valley and also measured food availability. Overall, pecan groves had the highest biomass mainly driven by the amount of nuts. Invertebrate biomass was highest in forests but contributed only a small percentage to overall biomass. Age and sex classes were unevenly distributed among habitats with adult males primarily occupying pecan groves containing the highest nut biomass, females being found in forests which had the lowest nut biomass and young males primarily staying in forest fragments along creeks which had intermediate nut biomass. Males were in better body condition than females and were in slightly better condition in pecan groves. The results suggest that adult males occupy the highest quality habitat and may competitively exclude the other age and sex classes.
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Affiliation(s)
- Claudia Mettke-Hofmann
- School of Natural Sciences and Psychology, Liverpool John Moores University, Liverpool, United Kingdom; Smithsonian Migratory Bird Center, National Zoological Park, Washington, D. C., United States of America
| | - Paul B Hamel
- US Forest Service, Stoneville, MS, United States of America
| | | | - Theodore J Zenzal
- Department of Biological Sciences, University of Southern Mississippi, Hattiesburg, United States of America
| | - Anne Pellegrini
- SWCA Environmental Consultants, Flagstaff, AZ, United States of America
| | - Jennifer Malpass
- School of Environment and Natural Resources, Ohio State University, Columbus OH, United States of America
| | - Megan Garfinkel
- Department of Wildlife, Humboldt State University, Arcata CA, United States of America
| | - Nathan Schiff
- US Forest Service, Stoneville, MS, United States of America
| | - Russell Greenberg
- Smithsonian Migratory Bird Center, National Zoological Park, Washington, D. C., United States of America
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Matsumura S, Arlinghaus R, Dieckmann U. Foraging on spatially distributed resources with sub-optimal movement, imperfect information, and travelling costs: departures from the ideal free distribution. OIKOS 2010. [DOI: 10.1111/j.1600-0706.2010.18196.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tracking prey or tracking the prey's resource? Mechanisms of movement and optimal habitat selection by predators. J Theor Biol 2009; 256:187-200. [DOI: 10.1016/j.jtbi.2008.09.024] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2008] [Revised: 09/08/2008] [Accepted: 09/23/2008] [Indexed: 11/17/2022]
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Mari L, Casagrandi R, Gatto M, Avgar T, Nathan R. Movement Strategies of Seed Predators as Determinants of Plant Recruitment Patterns. Am Nat 2008; 172:694-711. [DOI: 10.1086/591687] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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McGill BJ, Brown JS. Evolutionary Game Theory and Adaptive Dynamics of Continuous Traits. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2007. [DOI: 10.1146/annurev.ecolsys.36.091704.175517] [Citation(s) in RCA: 151] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Brian J. McGill
- Department of Biology, McGill University, Stewart Biology Building, Montreal, QC H3A 1B1 Canada;
| | - Joel S. Brown
- Department of Biological Sciences, University of Illinois Chicago, Chicago, Illinois 60607;
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