Group Survival Value for Philodina Rosola, A Rotifer

Allee, W. C.; Rosenthal, Gert

doi:10.2307/1932623

Cited by 30 publications

(19 citation statements)

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“…As a consequence of pollinator preferences, plant populations with a low density may suffer from a decrease in pollination visits (pollinator limitation) due to a reduced attractiveness caused by fewer attraction cues, a lower total reward and longer travel times between bouts (Eriksson and Ehrlen 1992;Feldman 2008;Klinkhamer et al 1989;Sih and Baltus 1987). Very small or isolated populations are exposed to the risk of going extinct due to inbreeding depression caused by mating with closely related individuals or reproductive failure due to ineffective pollination (absence of pollinators) (Allee effect;Allee 1949;Dornier et al 2008;Forsyth 2003;Groom 1998;Lamont et al 1993). For a thorough understanding of the stability of mutualism, one has to understand how variation in population/community structure interacts with the occurrence and frequency of nectarless individuals or species.…”

Section: Introductionmentioning

confidence: 99%

Variable responses of hawkmoths to nectar-depleted plants in two native Petunia axillaris (Solanaceae) populations

Brandenburg

Bshary

2011

Arthropod-Plant Interactions

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Pollination success of deceptive orchids is affected by the density and distribution of nectar providing plant species and overall plant density. Here we extended the framework of how plant density can affect pollination to examine how it may promote the success of plant intraspecific cheaters. We compared hawkmoth behaviour in two native populations of Petunia axillaris, where we simultaneously offered rewarding and manually depleted P. axillaris. We asked whether pollinator foraging strategies change as a function of plant density and whether such changes may differentially affect nectarless plants. We observed the first choice and number of flowers visited by pollinators and found that in the dense population, pollinators visited more flowers on rewarding plants than on nectar-depleted plants. In the sparse population, such discrimination was absent. As we found no differences in nectar volume between plants of the two populations, the observed differences in plant density may be temporal. We reason that if differences were more permanent, an equivalent of the remote habitat hypothesis prevails: in a sparse population, cheating plants benefit from the absence of inter-and intraspecific competitors because pollinators tend to visit all potential resources. In a denser population, a pollinator's optimal foraging strategy involves more selectivity. This would cause between-plant competition for pollinators in a pollinator-limited context, which applies to most hawkmoth-pollinated systems. We propose that nectar-provisioning of plants can be density-dependant, with cheaters able to persist in low density areas.

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Section: Introductionmentioning

confidence: 99%

Variable responses of hawkmoths to nectar-depleted plants in two native Petunia axillaris (Solanaceae) populations

Brandenburg

Bshary

2011

Arthropod-Plant Interactions

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“…Limited gene flow after logging may also reduce genetic variability and thus the ability to adapt to changing environmental conditions. In concert, these processes may lead to negative density dependence at low densities (Allee, 1949), increasing the risk of local extinction for timber tree populations.…”

Section: Practical Considerations Of Livelihood and Sometimes Aesthetmentioning

confidence: 99%

Ecological limitations of reduced-impact logging at the smallholder scale

Rockwell¹,

Kainer²,

Marcondes³

et al. 2007

Forest Ecology and Management

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“…The Allee effect is a phenomenon in ecology characterized by a positive correlation between population density (or size) and its per capita growth rate [1,2]. In their book, Courchamp et al [8] described the Allee effect in a straightforward manner: 'The more the merrier' (see also [9]).…”

Section: Introductionmentioning

confidence: 99%

“…mate limitation, predator saturation, etc), and the demographic Allee effect (of overriding concern to conservationists). From these authors' point of view, the benefits of conspecificity (two or more individuals are conspecific if they belong to the same species) may include one or more predator dilution or saturation: (1) Antipredator vigilance or aggression; (2) cooperative predation or resource defense; (3) social thermoregulation; (4) collective modification or amelioration of the environment; (5) increased pollination or fertilization success; (6) conspecific enhancement of reproduction; and (7) reduction of inbreeding, genetic drift or loss of integrity by hybridization. Stephens et al [31], then, put forward a definition of the Allee effect as follows: 'The Allee effect is defined as a positive relationship between any component of individual fitness and either numbers or density of conspecifics.…”

Section: Introductionmentioning

confidence: 99%

Competition models with Allee effects

Livadiotis

Assas

Elaydi

et al. 2014

Journal of Difference Equations and Applications

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In this paper, we study a generalized two-species contest-competition model with an Allee effect. We provide a complete analysis of the global dynamics of the system. In particular, we determine all the invariant manifolds, the extinction, the exclusion and the coexistence regions. We use tools from topology and dynamical systems to show that all orbits must converge to one of the equilibrium points of the system. The analysis shows that there are several potential scenarios including competition coexistence, exclusion and extinction.

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Group Survival Value for Philodina Rosola, A Rotifer

Cited by 30 publications

References 0 publications

Variable responses of hawkmoths to nectar-depleted plants in two native Petunia axillaris (Solanaceae) populations

Variable responses of hawkmoths to nectar-depleted plants in two native Petunia axillaris (Solanaceae) populations

Ecological limitations of reduced-impact logging at the smallholder scale

Competition models with Allee effects

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