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Causes and consequences of individual specialization in Poecilia vivipara (Cyprinodontiformes, Poeciliidae)

Grant number: 10/15567-8
Support type:Research Grants - Young Investigators Grants
Duration: March 01, 2011 - February 29, 2016
Field of knowledge:Biological Sciences - Ecology
Principal Investigator:Márcio Silva Araújo
Grantee:Márcio Silva Araújo
Home Institution: Instituto de Biociências (IB). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil
Assoc. researchers:Plínio Barbosa de Camargo ; Sergio Ivan Perez
Associated scholarship(s):13/01390-7 - Life-history evolution of Poecilia vivipara (Cyprinodontiformes: Poeciliidae) along a predation gradient, BP.IC


Generalist populations can be formed by highly specialized individuals, whose niches are small subsets of the population niche. This "individual specialization" in turn may have important ecological and evolutionary implications. In spite of the large number of empirical examples in the literature, we still know little about the ecological mechanisms generating and maintaining this phenomenon in natural populations, as well as its evolutionary implications. In the present proposal, we want to investigate the effect of increased intraspecific competition, caused by predation release, on the degree of individual specialization of the livebearing fish Poecilia vivipara (Poeciliidae), inhabiting the system of lagoons of northern Rio de Janeiro state. These lagoons vary dramatically in salinity and, as a consequence, in the presence of the predator of P. vivipara in this system, Hoplias malabaricus, constituting a natural, large-scale "experiment". Natural abundances and body condition of P. vivipara will be quantified in different predation regimes. The degree of individual specialization will be quantified with the use of gut contents and stable isotopes. Finally, using body condition as a proxy for fitness, we will test for the presence of divergent natural selection on trophic morphology favoring phenotypes associated with the use of alternative resources in the low-predation regime. (AU)

Scientific publications (10)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
COSTA-PEREIRA, RAUL; TOSCANO, BENJAMIN; SOUZA, FRANCO L.; INGRAM, TRAVIS; ARAUJO, MARCIO S. Individual niche trajectories drive fitness variation. FUNCTIONAL ECOLOGY, v. 33, n. 9 JULY 2019. Web of Science Citations: 0.
COSTA-PEREIRA, RAUL; ARAUJO, MARCIO S.; SOUZA, FRANCO L.; INGRAM, TRAVIS. Competition and resource breadth shape niche variation and overlap in multiple trophic dimensions. PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, v. 286, n. 1902 MAY 1 2019. Web of Science Citations: 2.
RIUS, BIANCA F.; PETRY, ANA CRISTINA; LANGERHANS, R. BRIAN; FIGUEIREDO-BARROS, MARCOS P.; BOZELLI, REINALDO L.; HONDA, LAURA K.; NOVA, CLARICE C.; ARAUJO, MARCIO S. Correlates of life-history variation in the livebearing fish Poecilia vivipara (Cyprinodontiformes: Poeciliidae) inhabiting an environmental gradient. Biological Journal of the Linnean Society, v. 126, n. 3, p. 436-446, MAR 2019. Web of Science Citations: 1.
COSTA-PEREIRA, RAUL; ARAUJO, MARCIO SILVA; OLIVIER, RENAN DA SILVA; SOUZA, FRANCO L.; RUDOLF, VOLKER H. W. Prey Limitation Drives Variation in Allometric Scaling of Predator-Prey Interactions. American Naturalist, v. 192, n. 4, p. E139-E149, OCT 2018. Web of Science Citations: 8.
COSTA-PEREIRA, RAUL; RUDOLF, VOLKER H. W.; SOUZA, FRANCO L.; ARAUJO, MARCIO S. Drivers of individual niche variation in coexisting species. Journal of Animal Ecology, v. 87, n. 5, p. 1452-1464, SEP 2018. Web of Science Citations: 8.
ARAUJO, MARCIO S.; LAYMAN, CRAIG A.; LANGERHANS, R. BRIAN. Body streamlining is related to higher growth in Bahamian mosquitofish. EVOLUTIONARY ECOLOGY RESEARCH, v. 18, n. 4, p. 383-391, JUL 2017. Web of Science Citations: 0.
COSTA-PEREIRA, RAUL; TAVARES, LUIZ E. R.; DE CAMARGO, PLINLO BARBOSA; ARAUJO, MARCIO S. Seasonal population and individual niche dynamics in a tetra fish in the Pantanal wetlands. Biotropica, v. 49, n. 4, p. 531-538, JUL 2017. Web of Science Citations: 10.
LEMOS-COSTA, PAULA; PIRES, MATHIAS M.; ARAUJO, MARCIO S.; DE AGUIAR, MARCUS A. M.; GUIMARAES, JR., PAULO R. Network analyses support the role of prey preferences in shaping resource use patterns within five animal populations. OIKOS, v. 125, n. 4, p. 492-501, APR 2016. Web of Science Citations: 6.
ARAUJO, MARCIO S.; IVAN PEREZ, S.; MAGAZONI, MARIA JULIA C.; PETRY, ANA C. Body size and allometric shape variation in the molly Poecilia vivipara along a gradient of salinity and predation. BMC Evolutionary Biology, v. 14, DEC 4 2014. Web of Science Citations: 12.
ARAUJO, MARCIO S.; LANGERHANS, R. BRIAN; GIERY, SEAN T.; LAYMAN, CRAIG A. Ecosystem fragmentation drives increased diet variation in an endemic livebearing fish of the Bahamas. ECOLOGY AND EVOLUTION, v. 4, n. 16, p. 3298-3308, AUG 2014. Web of Science Citations: 19.

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