scholarly journals The effect of conspecific density, herbivory, and bamboo on seedling dynamics of a dominant oak in a Neotropical highland forest

Biotropica ◽  
2019 ◽  
Vol 51 (6) ◽  
pp. 817-825
Author(s):  
Irene Calderón‐Sanou ◽  
Luis Diego Ríos ◽  
Alfredo Cascante‐Marín ◽  
Gilbert Barrantes ◽  
Eric J. Fuchs
Keyword(s):  
Conspecific Density ◽  
Seedling Dynamics

scholarly journals Interactions in a warmer world: effects of experimental warming, conspecific density, and herbivory on seedling dynamics

Ecosphere ◽  
2014 ◽  
Vol 5 (1) ◽  
pp. art9 ◽  
Author(s):  
Melissa A. Burt ◽  
Robert R. Dunn ◽  
Lauren M. Nichols ◽  
Nathan J. Sanders
Keyword(s):  
Experimental Warming ◽  
Conspecific Density ◽  
Seedling Dynamics

Postfire seedling dynamics and performance in Pinus halepensis Mill. populations

2010 ◽  
Vol 36 (5) ◽  
pp. 446-453 ◽  
Author(s):  
Evangelia N. Daskalakou ◽  
Costas A. Thanos
Keyword(s):  
Pinus Halepensis ◽  
Seedling Dynamics ◽  
And Performance

Intensive research activity alters short-term seedling dynamics in a tropical forest

2008 ◽  
Vol 24 (1) ◽  
pp. 225-230 ◽  
Author(s):  
Liza S. Comita ◽  
Gregory R. Goldsmith ◽  
Stephen P. Hubbell
Keyword(s):  
Tropical Forest ◽  
Short Term ◽  
Research Activity ◽  
Intensive Research ◽  
Seedling Dynamics

scholarly journals Natural seed germination and seedling dynamics in cultivated population of Cassia fistula Linn. in Nigeria

2015 ◽  
Vol 10 (8) ◽  
pp. 865-870
Author(s):  
Tejumola Okusanya Olubukanla ◽  
Olanrewaju Shonubi Olusola ◽  
Elutola Babalola Sadat
Keyword(s):  
Seed Germination ◽  
Cassia Fistula ◽  
Seedling Dynamics

scholarly journals A cryptic Allee effect: spatial contexts mask an existing fitness–density relationship

2015 ◽  
Vol 2 (6) ◽  
pp. 150034 ◽  
Author(s):  
Akira Terui ◽  
Yusuke Miyazaki ◽  
Akira Yoshioka ◽  
Shin-ichiro S. Matsuzaki
Keyword(s):  
Allee Effect ◽  
Local Level ◽  
Freshwater Mussel ◽  
Fertilization Rate ◽  
Positive Density ◽  
Allee Effects ◽  
Flow Conditions ◽  
Conspecific Density ◽  
Sperm Density ◽  
Density Relationship

Current theories predict that Allee effects should be widespread in nature, but there is little consistency in empirical findings. We hypothesized that this gap can arise from ignoring spatial contexts (i.e. spatial scale and heterogeneity) that potentially mask an existing fitness–density relationship: a ‘cryptic’ Allee effect. To test this hypothesis, we analysed how spatial contexts interacted with conspecific density to influence the fertilization rate of the freshwater mussel Margaritifera laevis . This sessile organism has a simple fertilization process whereby females filter sperm from the water column; this system enabled us to readily assess the interaction between conspecific density and spatial heterogeneity (e.g. flow conditions) at multiple spatial levels. Our findings were twofold. First, positive density-dependence in fertilization was undetectable at a population scale (approx. less than 50.5 m 2 ), probably reflecting the exponential decay of sperm density with distance from the sperm source. Second, the Allee effect was confirmed at a local level (0.25 m 2 ), but only when certain flow conditions were met (slow current velocity and shallow water depth). These results suggest that spatial contexts can mask existing Allee effects.

Den sharing by juvenile Caribbean spiny lobsters (Panulirus argus) in nursery habitat: cooperation or coincidence?

1997 ◽  
Vol 48 (8) ◽  
pp. 751 ◽  
Author(s):  
Michael J. Childress ◽  
William F. Herrnkind
Keyword(s):  
Life History Traits ◽  
Dilution Effect ◽  
Nursery Habitat ◽  
Panulirus Argus ◽  
Predator Density ◽  
Conspecific Density ◽  
Spiny Lobsters ◽  
Effect Hypothesis ◽  
Highly Correlated ◽  
Sharing Patterns

Spiny lobsters (Palinuridae) commonly share crevice shelters with conspecifics, a behaviour usually hypothesized to benefit mutually cooperative defenders through reduced predation risk. The group-defence hypothesis predicts a suite of distinct corollary life history traits and ecological correlates including more frequent co-denning than solitary denning, especially where predators or den competitors are numerous and when the lobsters are small, moulting or otherwise vulnerable. Two alternative co-denning hypotheses, the dilution effect (a type of selfish herding) and the guide effect (attraction to a denned conspecific), have different and distinctive sets of predictions. To test among these hypotheses, the den-sharing patterns of newly emerged postalgal juveniles of Panulirus argus and associated ecological conditions in the Florida Bay (USA) nursery habitat were examined. Only half of the juveniles shared dens, and rarely was den sharing in an area greater than that expected by chance. Den-sharing frequency was most highly correlated with conspecific density and scarcity of local dens. The lack of correlation between den sharing and lobster size, moult condition, shelter type and predator density failed to support either the group-defence or the dilution-effect hypothesis. Instead, the data better support the guide-effect hypothesis.

scholarly journals The Effect of Conspecific Density on Emergence ofLestes bipupillatusCalvert, 1909 (Odonata: Lestidae)

2014 ◽  
Vol 2014 ◽  
pp. 1-3 ◽  
Author(s):  
Ricardo Cardoso-Leite ◽  
Gabriel C. Vilardi ◽  
Rhainer Guillermo-Ferreira ◽  
Pitágoras C. Bispo
Keyword(s):  
Population Dynamics ◽  
Density Dependence ◽  
Social Environment ◽  
Growth Rates ◽  
High Density ◽  
Conspecific Density ◽  
Simulated Environments ◽  
The Social ◽  
Emergence Date

Conspecific density may influence adult recruitment and consequently population dynamics. Several studies have shown the density dependence of larvae growth rates in Odonata. However, few studies studied how conspecific density influence final instar larvae emergence date decisions. Considering that larvae may choose the date of emergence, the present study investigated if density affects larvae choice. For this, we reared eight final instar larvae in individual aquaria and other 24 larvae in aquaria with three larvae each. This way, we simulated environments with low and high larval densities. We then noted the days that larvae took to emerge and compared it between low and high density groups. The results showed that larvae seem to emerge earlier when in high densities (Mann-Whitney,U=10.000,P=0.03). These results support the hypothesis that damselfly last instar larvae may postpone or hasten emergence in response to the social environment and related constraints.

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