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Start Over Author "Chisholm, Ryan A." Journal ecology letters
13 results on '"Chisholm, Ryan A."'

5. Temporal population variability in local forest communities has mixed effects on tree species richness across a latitudinal gradient

Author

Fung, Tak, primary, Chisholm, Ryan A., additional, Anderson‐Teixeira, Kristina, additional, Bourg, Norm, additional, Brockelman, Warren Y., additional, Bunyavejchewin, Sarayudh, additional, Chang‐Yang, Chia‐Hao, additional, Chitra‐Tarak, Rutuja, additional, Chuyong, George, additional, Condit, Richard, additional, Dattaraja, Handanakere S., additional, Davies, Stuart J., additional, Ewango, Corneille E. N., additional, Fewless, Gary, additional, Fletcher, Christine, additional, Gunatilleke, C. V. Savitri, additional, Gunatilleke, I. A. U. Nimal, additional, Hao, Zhanqing, additional, Hogan, J. Aaron, additional, Howe, Robert, additional, Hsieh, Chang‐Fu, additional, Kenfack, David, additional, Lin, YiChing, additional, Ma, Keping, additional, Makana, Jean‐Remy, additional, McMahon, Sean, additional, McShea, William J., additional, Mi, Xiangcheng, additional, Nathalang, Anuttara, additional, Ong, Perry S., additional, Parker, Geoffrey, additional, Rau, E‐Ping, additional, Shue, Jessica, additional, Su, Sheng‐Hsin, additional, Sukumar, Raman, additional, Sun, I‐Fang, additional, Suresh, Hebbalalu S., additional, Tan, Sylvester, additional, Thomas, Duncan, additional, Thompson, Jill, additional, Valencia, Renato, additional, Vallejo, Martha I., additional, Wang, Xugao, additional, Wang, Yunquan, additional, Wijekoon, Pushpa, additional, Wolf, Amy, additional, Yap, Sandra, additional, and Zimmerman, Jess, additional

Published
2019
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7. Mean growth rate when rare is not a reliable metric for persistence of species.

Author

Pande, Jayant, Fung, Tak, Chisholm, Ryan, Shnerb, Nadav M., and Coulson, Tim

Subjects
BIOTIC communities, PERSISTENCE, SPECIES, BIOLOGICAL extinction, COEXISTENCE of species
Abstract

The coexistence of many species within ecological communities poses a long‐standing theoretical puzzle. Modern coexistence theory (MCT) and related techniques explore this phenomenon by examining the chance of a species population growing from rarity in the presence of all other species. The mean growth rate when rare, E[r], is used in MCT as a metric that measures persistence properties (like invasibility or time to extinction) of a population. Here we critique this reliance on E[r] and show that it fails to capture the effect of temporal random abundance variations on persistence properties. The problem becomes particularly severe when an increase in the amplitude of stochastic temporal environmental variations leads to an increase in E[r], since at the same time it enhances random abundance fluctuations and the two effects are inherently intertwined. In this case, the chance of invasion and the mean extinction time of a population may even go down as E[r] increases. [ABSTRACT FROM AUTHOR]

Published
2020
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8. Temporal population variability in local forest communities has mixed effects on tree species richness across a latitudinal gradient.

Author

Fung, Tak, Chisholm, Ryan A., Anderson‐Teixeira, Kristina, Bourg, Norm, Brockelman, Warren Y., Bunyavejchewin, Sarayudh, Chang‐Yang, Chia‐Hao, Chitra‐Tarak, Rutuja, Chuyong, George, Condit, Richard, Dattaraja, Handanakere S., Davies, Stuart J., Ewango, Corneille E. N., Fewless, Gary, Fletcher, Christine, Gunatilleke, C. V. Savitri, Gunatilleke, I. A. U. Nimal, Hao, Zhanqing, Hogan, J. Aaron, and Howe, Robert

Subjects
*SPECIES diversity, *COMMUNITY forests, *BIOTIC communities, *BIOLOGICAL extinction, *COEXISTENCE of species, *TREES, *HABITAT partitioning (Ecology)
Abstract

Among the local processes that determine species diversity in ecological communities, fluctuation‐dependent mechanisms that are mediated by temporal variability in the abundances of species populations have received significant attention. Higher temporal variability in the abundances of species populations can increase the strength of temporal niche partitioning but can also increase the risk of species extinctions, such that the net effect on species coexistence is not clear. We quantified this temporal population variability for tree species in 21 large forest plots and found much greater variability for higher latitude plots with fewer tree species. A fitted mechanistic model showed that among the forest plots, the net effect of temporal population variability on tree species coexistence was usually negative, but sometimes positive or negligible. Therefore, our results suggest that temporal variability in the abundances of species populations has no clear negative or positive contribution to the latitudinal gradient in tree species richness. [ABSTRACT FROM AUTHOR]

Published
2020
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12. Temporal variability of forest communities: empirical estimates of population change in 4000 tree species

Author

Chisholm, Ryan A., primary, Condit, Richard, additional, Rahman, K. Abd., additional, Baker, Patrick J., additional, Bunyavejchewin, Sarayudh, additional, Chen, Yu-Yun, additional, Chuyong, George, additional, Dattaraja, H. S., additional, Davies, Stuart, additional, Ewango, Corneille E. N., additional, Gunatilleke, C. V. S., additional, Nimal Gunatilleke, I. A. U., additional, Hubbell, Stephen, additional, Kenfack, David, additional, Kiratiprayoon, Somboon, additional, Lin, Yiching, additional, Makana, Jean-Remy, additional, Pongpattananurak, Nantachai, additional, Pulla, Sandeep, additional, Punchi-Manage, Ruwan, additional, Sukumar, Raman, additional, Su, Sheng-Hsin, additional, Sun, I-Fang, additional, Suresh, H. S., additional, Tan, Sylvester, additional, Thomas, Duncan, additional, and Yap, Sandra, additional

Published
2014
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