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5 results for “Janzen Connell effects”
Data and code from: The functional form of specialized predation affects whether Janzen-Connell effects can prevent competitive exclusion
<p><span>Janzen</span><span>-</span><span>Connell</span><span> Effects (</span><span>JCEs</span><span>), specialized </span><span>predation</span><span> of seeds and seedlings near </span><span>conspecific</span><span> trees, are hypothesized to maintain species richness. While previous studies show </span><span>JCEs</span><span> can maintain high richness relative to neutral communities, recent theoretical work indicates </span><span>JCEs</span><span> may weakly inhibit competitive exclusion when species exhibit inter-specific fitness variation. However, recent models make somewhat restrictive assumptions about the functional form of specialized </span><span>predation</span><span> -- that </span><span>JCEs</span><span> occur at a fixed rate when offspring are within a fixed distance of a </span><span>conspecific</span><span> tree. Using a theoretical model, I show that the functional form of </span><span>JCEs</span><span> largely impacts their ability to maintain coexistence. If </span><span>predation</span><span> pressure increases </span><span>additively</span><span> with adult tree density and decays exponentially with distance, </span><span>JCEs</span><span> maintain considerably higher species richness than predicted by recent models. Loosely </span><span>parameterizing</span><span> the model with data from a Panamanian tree community, I elucidate the conditions under which </span><span>JCEs</span><span> are capable of maintaining high species richness. </span></p>
Data and code from: The functional form of specialized predation affects whether Janzen-Connell effects can prevent competitive exclusion
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Ants may buffer the Janzen–Connell effect in a tropical forest in Southwest China
<p>These files contain the datasets and R codes used in the data analyses in the paper " Ants may buffer the Janzen–Connell effect in a tropical forest in Southwest China" that will be published in Ecology</p>
Janzen-Connell effects partially supported in reef-building corals: adult presence interacts with settler density to limit establishment
<p>The Janzen-Connell hypothesis predicts increased survival of early life stages with decreasing conspecific density and increased distance from conspecific adults. Evidence of Janzen-Connell effects in maintaining diversity is common in plant communities, but its importance in sessile marine invertebrates communities remains unclear. Under controlled aquarium conditions, we examined the effect of density-dependence and adult conspecific water treatments (absent/present) on propagule settlement success and settler post-settlement survival, along with associated spatial patterns, for six broadcast-spawning, reef-building coral species from three families. We also tested if settlement success was linked to increasing propagule species diversity for three coral species from two families. We found that the probability of settlement was density independent and not influenced by adult present water treatments Yet, adult present water treatments and settler density did have a synergistic negative effect on the probability of short-term settler survival for all species examined. Settlers also showed greater spatial aggregation as their numbers increased, but were less aggregated in adult present water treatments compared to those in adult absent water treatments. We further show evidence of significant species interactions among propagules, as settlement in single-species trials was four-fold higher compared to mixed-species trials. Our findings from controlled experimental arenas indicate that the early establishment of corals was predominantly limited by density-dependent settler-adult interactions among conspecifics and propagule-propagule interactions among heterospecifics. Thus, the proximity to established conspecific adults, settler density and species diversity of propagules are relevant drivers of local coral community diversity and structure. Based on these outcomes, we suggest that the Janzen-Connell hypothesis, with demonstrated importance for plants, is partially upheld for reef corals.</p>
Janzen-Connell effects partially supported in reef-building corals: adult presence interacts with settler density to limit establishment
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