Ecological model of competitive interaction among three species of amphipods associated to Bryocladia thrysigera (J. Agardh) and extreme environmental stress effects

Flynn, Máurea Nicoletti; Pereira, William Roberto Luiz Silva

doi:10.1590/s0104-64972013000100001

Cited by 3 publications

(2 citation statements)

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“…The level of aggression displayed by competitors during such interactions is influenced by the potential benefits obtained by winning a contest, and the risks faced during confrontations (Maynard-Smith 1982, Enquist and Leimar 1987, Innocent et al 2011. Accordingly, fluctuations in resource availability, competitive ability, or changes in the population density of competitors are likely to influence the coexistence of antagonistic competitors (Brown 1989, Sih et al 2012, Flynn and Pereira 2013, Jiang et al 2015.…”

Section: Impacts Of Worker Density In Colony-level Aggression Expansmentioning

confidence: 99%

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Impacts of worker density in colony‐level aggression, expansion, and survival of the acacia‐ant Crematogaster mimosae

Ruiz-Guajardo

Grossenbacher

Grosberg

et al. 2017

Ecological Monographs

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Experimental studies assessing the impact of demographic changes on aggression and inter‐group competitive outcomes in communities of social species are rare. This gap in our knowledge is important, not only because social species are foundational elements of many terrestrial ecosystems, but because interference competition among social groups often involves decision‐like processes influenced by demographic and environmental contexts. In East Africa, the symbiotic ant Crematogaster mimosae is a co‐dominant competitor that engages in high‐mortality, intra‐ and interspecific battles for sole possession of host trees. We manipulated worker density on C. mimosae Acacia host trees, and the colony's opportunity to expand onto neighboring trees to identify how these factors influenced colony‐level aggression, expansion success, and longer‐term survivorship. Worker density on focal trees was increased through translocation of domatia‐bearing branches, and was decreased using partial tree fumigations. We examined impacts of density manipulations on aggression and immediate expansion success under two different risk scenarios. We tied focal trees to either an experimentally emptied‐tree (low‐risk treatment), or to a C. nigriceps‐occupied tree (high‐risk treatment). Expansion success onto emptied neighbor trees was 100% for controls and increased‐density colonies, but only 50% for decreased‐density colonies, despite the fact that host trees are a limiting resource in this system. Success expanding onto trees occupied by a heterospecific competitor reached 36%, 40%, and 79% in decreased, control, and increased‐density trees, respectively. Our results show that changes in worker density due to disturbances or inter‐group battles have the potential to disrupt competitive hierarchies. Worker density manipulations also affected longer‐term colony persistence. Behavioral and genetic data revealed that 12 months after expansions 100% of the decreased‐density colonies, and 25% of control and increased‐density colonies, had been supplanted by neighboring opportunistic conspecifics. Intraspecific aggression may have lower costs in C. mimosae because aggressive colonies can incorporate workers or queens from defeated competitors. The unexpectedly high frequency of conflicts between conspecific C. mimosae, in combination with behaviors decreasing the cost of intraspecific competition relative to interspecific conflict, may create opportunities for the survival of subordinate competitors in this ant–plant system.

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Section: Impacts Of Worker Density In Colony-level Aggression Expansmentioning

confidence: 99%

“…Accordingly, fluctuations in resource availability, competitive ability, or changes in the population density of competitors are likely to influence the coexistence of antagonistic competitors (Brown , Sih et al. , Flynn and Pereira , Jiang et al. ).…”

Section: Introductionmentioning

confidence: 99%

Impacts of worker density in colony‐level aggression, expansion, and survival of the acacia‐ant Crematogaster mimosae

Ruiz-Guajardo

Grossenbacher

Grosberg

et al. 2017

Ecological Monographs

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Population dynamics of Parhyale hawaiensis (Dana, 1853) (Amphipoda: Hyalidae) associated with an intertidal algal belt in southeastern Brazil

Alegretti

Umbuzeiro

Flynn

2016

Journal of Crustacean Biology

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Alometrias em toda parte

Pereira¹

2015

REV

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A scaling relationship emerges when a variable can be explained in function to another by a power-law Y = ax b . An allometric scaling emerges when a given biological variable can be explained in a power-law Y = am b , but in this case, the variable becomes function of organism's body mass (but to the last one there are exceptions). Both the scaling relationship and allometric scaling rise in several levels of biological organization, since metabolical and physiological to the ecosystemic approach. Currently this field is intensely debated: in one side theoreticals make an effort to explain why some allometries lay down in characteristics values to the exponents and the mechanisms that define the values; in the other side there are experts who describre new allometries from carefully controlled experiments, whose results strengthen or weaken theoretical arguments. It's too hard to follow all the development in this intriguing biological field, given the large knowledge generated until nowadays. Then, the propose of this article is to guide the reader since the initial investigations of the allometric concept, pointing some biological fields that scaling relationship and allometric scaling are studied and applied, pointing some advances and pratical applications. em toda parte. RevInter Revista Intertox de Toxicologia, Risco Ambiental e Sociedade, v. 6, n. 1, p. 78-101, fev. 2013. regulares, mas não contíguos; (d) ou em áreas em que variam de tamanho, como ilhas ou fragmentos florestais.

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Ecological model of competitive interaction among three species of amphipods associated to Bryocladia thrysigera (J. Agardh) and extreme environmental stress effects

Cited by 3 publications

References 14 publications

Impacts of worker density in colony‐level aggression, expansion, and survival of the acacia‐ant Crematogaster mimosae

Impacts of worker density in colony‐level aggression, expansion, and survival of the acacia‐ant Crematogaster mimosae

Population dynamics of Parhyale hawaiensis (Dana, 1853) (Amphipoda: Hyalidae) associated with an intertidal algal belt in southeastern Brazil

Alometrias em toda parte

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