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1. Linking seed size and number to trait syndromes in trees

Author

Bogdziewicz, M, Acuña, MCA, Andrus, R, Ascoli, D, Bergeron, Y, Brveiller, D, Boivin, T, Bonal, R, Caignard, T, Cailleret, M, Calama, R, Calderon, SD, Camarero, JJ, Chang-Yang, CH, Chave, J, Chianucci, F, Cleavitt, NL, Courbaud, B, Cutini, A, Curt, T, Das, A, Davi, H, Delpierre, N, Delzon, S, Dietze, M, Dormont, L, Farfan-Rios, W, Gehring, CA, Gilbert, GS, Gratzer, G, Greenberg, CH, Guignabert, A, Guo, Q, Hacket-Pain, A, Hampe, A, Han, Q, Hoshizaki, K, Ibanez, I, Johnstone, JF, Journé, V, Kitzberger, T, Knops, JMH, Kunstler, G, Kobe, R, Lageard, JGA, LaMontagne, JM, Ledwon, M, Leininger, T, Limousin, JM, Lutz, JA, Macias, D, Marell, A, McIntire, EJB, Moran, E, Motta, R, Myers, J, Nagel, TA, Naoe, S, Noguchi, M, Oguro, M, Kurokawa, H, Ourcival, JM, Parmenter, R, Perez-Ramos, IM, Piechnik, L, Podgórski, T, Poulsen, J, Qiu, T, Redmond, MD, Reid, CD, Rodman, KC, Šamonil, P, Holik, J, Scher, CL, Van Marle, HS, Seget, B, Shibata, M, Sharma, S, Silman, M, Steele, MA, Straub, JN, Sun, IF, Sutton, S, Swenson, J, Thomas, PA, Uriarte, M, Vacchiano, G, Veblen, TT, Wright, B, Wright, Sam, Whitham, TG, Zhu, K, Zimmerman, JK, Zywiec, M, Clark, JS, Bogdziewicz, M, Acuña, MCA, Andrus, R, Ascoli, D, Bergeron, Y, Brveiller, D, Boivin, T, Bonal, R, Caignard, T, Cailleret, M, Calama, R, Calderon, SD, Camarero, JJ, Chang-Yang, CH, Chave, J, Chianucci, F, Cleavitt, NL, Courbaud, B, Cutini, A, Curt, T, Das, A, Davi, H, Delpierre, N, Delzon, S, Dietze, M, Dormont, L, Farfan-Rios, W, Gehring, CA, Gilbert, GS, Gratzer, G, Greenberg, CH, Guignabert, A, Guo, Q, Hacket-Pain, A, Hampe, A, Han, Q, Hoshizaki, K, Ibanez, I, Johnstone, JF, Journé, V, Kitzberger, T, Knops, JMH, Kunstler, G, Kobe, R, Lageard, JGA, LaMontagne, JM, Ledwon, M, Leininger, T, Limousin, JM, Lutz, JA, Macias, D, Marell, A, McIntire, EJB, Moran, E, Motta, R, Myers, J, Nagel, TA, Naoe, S, Noguchi, M, Oguro, M, Kurokawa, H, Ourcival, JM, Parmenter, R, Perez-Ramos, IM, Piechnik, L, Podgórski, T, Poulsen, J, Qiu, T, Redmond, MD, Reid, CD, Rodman, KC, Šamonil, P, Holik, J, Scher, CL, Van Marle, HS, Seget, B, Shibata, M, Sharma, S, Silman, M, Steele, MA, Straub, JN, Sun, IF, Sutton, S, Swenson, J, Thomas, PA, Uriarte, M, Vacchiano, G, Veblen, TT, Wright, B, Wright, Sam, Whitham, TG, Zhu, K, Zimmerman, JK, Zywiec, M, and Clark, JS

Abstract

Aim: Our understanding of the mechanisms that maintain forest diversity under changing climate can benefit from knowledge about traits that are closely linked to fitness. We tested whether the link between traits and seed number and seed size is consistent with two hypotheses, termed the leaf economics spectrum and the plant size syndrome, or whether reproduction represents an independent dimension related to a seed size–seed number trade-off. Location: Most of the data come from Europe, North and Central America and East Asia. A minority of the data come from South America, Africa and Australia. Time period: 1960–2022. Major taxa studied: Trees. Methods: We gathered 12 million observations of the number of seeds produced in 784 tree species. We estimated the number of seeds produced by individual trees and scaled it up to the species level. Next, we used principal components analysis and generalized joint attribute modelling (GJAM) to map seed number and size on the tree traits spectrum. Results: Incorporating seed size and number into trait analysis while controlling for environment and phylogeny with GJAM exposes relationships in trees that might otherwise remain hidden. Production of the large total biomass of seeds [product of seed number and seed size; hereafter, species seed productivity (SSP)] is associated with high leaf area, low foliar nitrogen, low specific leaf area (SLA) and dense wood. Production of high seed numbers is associated with small seeds produced by nutrient-demanding species with softwood, small leaves and high SLA. Trait covariation is consistent with opposing strategies: one fast-growing, early successional, with high dispersal, and the other slow-growing, stress-tolerant, that recruit in shaded conditions. Main conclusions: Earth system models currently assume that reproductive allocation is indifferent among plant functional types. Easily measurable seed size is a strong predictor of the seed number and species seed productivity. The co

Published
2023

2. Masting is uncommon in trees that depend on mutualist dispersers in the context of global climate and fertility gradients

Author

Qiu, T, Aravena, MC, Ascoli, D, Bergeron, Y, Bogdziewicz, M, Boivin, T, Bonal, R, Caignard, T, Cailleret, M, Calama, R, Calderon, SD, Camarero, JJ, Chang-Yang, CH, Chave, J, Chianucci, F, Courbaud, B, Cutini, A, Das, AJ, Delpierre, N, Delzon, S, Dietze, M, Dormont, L, Espelta, JM, Fahey, TJ, Farfan-Rios, W, Franklin, JF, Gehring, CA, Gilbert, GS, Gratzer, G, Greenberg, CH, Guignabert, A, Guo, Q, Hacket-Pain, A, Hampe, A, Han, Q, Holik, J, Hoshizaki, K, Ibanez, I, Johnstone, JF, Journé, V, Kitzberger, T, Knops, JMH, Kunstler, G, Kurokawa, H, Lageard, J, LaMontagne, JM, Lefevre, F, Leininger, T, Limousin, JM, Lutz, JA, Macias, D, Marell, A, McIntire, EJB, Moore, CM, Moran, E, Motta, R, Myers, JA, Nagel, TA, Naoe, S, Noguchi, M, Oguro, M, Parmenter, R, Pearse, IS, Perez-Ramos, IM, Piechnik, L, Podgorski, T, Poulsen, J, Redmond, MD, Reid, CD, Rodman, KC, Rodriguez-Sanchez, F, Samonil, P, Sanguinetti, JD, Scher, CL, Seget, B, Sharma, S, Shibata, M, Silman, M, Steele, MA, Stephenson, NL, Straub, JN, Sutton, S, Swenson, JJ, Swift, M, Thomas, PA, Uriarte, M, Vacchiano, G, Whipple, AV, Whitham, TG, Wion, AP, Wright, SJ, Zhu, K, Zimmerman, JK, Zywiec, M, Clark, JS, Qiu, T, Aravena, MC, Ascoli, D, Bergeron, Y, Bogdziewicz, M, Boivin, T, Bonal, R, Caignard, T, Cailleret, M, Calama, R, Calderon, SD, Camarero, JJ, Chang-Yang, CH, Chave, J, Chianucci, F, Courbaud, B, Cutini, A, Das, AJ, Delpierre, N, Delzon, S, Dietze, M, Dormont, L, Espelta, JM, Fahey, TJ, Farfan-Rios, W, Franklin, JF, Gehring, CA, Gilbert, GS, Gratzer, G, Greenberg, CH, Guignabert, A, Guo, Q, Hacket-Pain, A, Hampe, A, Han, Q, Holik, J, Hoshizaki, K, Ibanez, I, Johnstone, JF, Journé, V, Kitzberger, T, Knops, JMH, Kunstler, G, Kurokawa, H, Lageard, J, LaMontagne, JM, Lefevre, F, Leininger, T, Limousin, JM, Lutz, JA, Macias, D, Marell, A, McIntire, EJB, Moore, CM, Moran, E, Motta, R, Myers, JA, Nagel, TA, Naoe, S, Noguchi, M, Oguro, M, Parmenter, R, Pearse, IS, Perez-Ramos, IM, Piechnik, L, Podgorski, T, Poulsen, J, Redmond, MD, Reid, CD, Rodman, KC, Rodriguez-Sanchez, F, Samonil, P, Sanguinetti, JD, Scher, CL, Seget, B, Sharma, S, Shibata, M, Silman, M, Steele, MA, Stephenson, NL, Straub, JN, Sutton, S, Swenson, JJ, Swift, M, Thomas, PA, Uriarte, M, Vacchiano, G, Whipple, AV, Whitham, TG, Wion, AP, Wright, SJ, Zhu, K, Zimmerman, JK, Zywiec, M, and Clark, JS

Abstract

The benefits of masting (volatile, quasi-synchronous seed production at lagged intervals) include satiation of seed predators, but these benefits come with a cost to mutualist pollen and seed dispersers. If the evolution of masting represents a balance between these benefits and costs, we expect mast avoidance in species that are heavily reliant on mutualist dispersers. These effects play out in the context of variable climate and site fertility among species that vary widely in nutrient demand. Meta-analyses of published data have focused on variation at the population scale, thus omitting periodicity within trees and synchronicity between trees. From raw data on 12 million tree-years worldwide, we quantified three components of masting that have not previously been analysed together: (i) volatility, defined as the frequency-weighted year-to-year variation; (ii) periodicity, representing the lag between high-seed years; and (iii) synchronicity, indicating the tree-to-tree correlation. Results show that mast avoidance (low volatility and low synchronicity) by species dependent on mutualist dispersers explains more variation than any other effect. Nutrient-demanding species have low volatility, and species that are most common on nutrient-rich and warm/wet sites exhibit short periods. The prevalence of masting in cold/dry sites coincides with climatic conditions where dependence on vertebrate dispersers is less common than in the wet tropics. Mutualist dispersers neutralize the benefits of masting for predator satiation, further balancing the effects of climate, site fertility and nutrient demands.

Published
2023

3. Limits to reproduction and seed size-number trade-offs that shape forest dominance and future recovery

Author

Qiu, T, Andrus, R, Aravena, MC, Ascoli, D, Bergeron, Y, Berretti, R, Berveiller, D, Bogdziewicz, M, Boivin, T, Bonal, R, Bragg, DC, Caignard, T, Calama, R, Camarero, JJ, Chang-Yang, CH, Cleavitt, NL, Courbaud, B, Courbet, F, Curt, T, Das, AJ, Daskalakou, E, Davi, H, Delpierre, N, Delzon, S, Dietze, M, Calderon, SD, Dormont, L, Espelta, J, Fahey, TJ, Farfan-Rios, W, Gehring, CA, Gilbert, GS, Gratzer, G, Greenberg, CH, Guo, Q, Hacket-Pain, A, Hampe, A, Han, Q, Hille Ris Lambers, J, Hoshizaki, K, Ibanez, I, Johnstone, JF, Journé, V, Kabeya, D, Kilner, CL, Kitzberger, T, Knops, JMH, Kobe, RK, Kunstler, G, Lageard, JGA, LaMontagne, JM, Ledwon, M, Lefevre, F, Leininger, T, Limousin, JM, Lutz, JA, Macias, D, McIntire, EJB, Moore, CM, Moran, E, Motta, R, Myers, JA, Nagel, TA, Noguchi, K, Ourcival, JM, Parmenter, R, Pearse, IS, Perez-Ramos, IM, Piechnik, L, Poulsen, J, Poulton-Kamakura, R, Redmond, MD, Reid, CD, Rodman, KC, Rodriguez-Sanchez, F, Sanguinetti, JD, Scher, CL, Schlesinger, WH, Schmidt Van Marle, H, Seget, B, Sharma, S, Silman, M, Steele, MA, Stephenson, NL, Straub, JN, Sun, IF, Sutton, S, Swenson, JJ, Swift, M, Thomas, PA, Uriarte, M, Vacchiano, G, Veblen, TT, Whipple, AV, Whitham, TG, Wion, AP, Wright, B, Wright, SJ, Zhu, K, Zimmerman, JK, Qiu, T, Andrus, R, Aravena, MC, Ascoli, D, Bergeron, Y, Berretti, R, Berveiller, D, Bogdziewicz, M, Boivin, T, Bonal, R, Bragg, DC, Caignard, T, Calama, R, Camarero, JJ, Chang-Yang, CH, Cleavitt, NL, Courbaud, B, Courbet, F, Curt, T, Das, AJ, Daskalakou, E, Davi, H, Delpierre, N, Delzon, S, Dietze, M, Calderon, SD, Dormont, L, Espelta, J, Fahey, TJ, Farfan-Rios, W, Gehring, CA, Gilbert, GS, Gratzer, G, Greenberg, CH, Guo, Q, Hacket-Pain, A, Hampe, A, Han, Q, Hille Ris Lambers, J, Hoshizaki, K, Ibanez, I, Johnstone, JF, Journé, V, Kabeya, D, Kilner, CL, Kitzberger, T, Knops, JMH, Kobe, RK, Kunstler, G, Lageard, JGA, LaMontagne, JM, Ledwon, M, Lefevre, F, Leininger, T, Limousin, JM, Lutz, JA, Macias, D, McIntire, EJB, Moore, CM, Moran, E, Motta, R, Myers, JA, Nagel, TA, Noguchi, K, Ourcival, JM, Parmenter, R, Pearse, IS, Perez-Ramos, IM, Piechnik, L, Poulsen, J, Poulton-Kamakura, R, Redmond, MD, Reid, CD, Rodman, KC, Rodriguez-Sanchez, F, Sanguinetti, JD, Scher, CL, Schlesinger, WH, Schmidt Van Marle, H, Seget, B, Sharma, S, Silman, M, Steele, MA, Stephenson, NL, Straub, JN, Sun, IF, Sutton, S, Swenson, JJ, Swift, M, Thomas, PA, Uriarte, M, Vacchiano, G, Veblen, TT, Whipple, AV, Whitham, TG, Wion, AP, Wright, B, Wright, SJ, Zhu, K, and Zimmerman, JK

Abstract

The relationships that control seed production in trees are fundamental to understanding the evolution of forest species and their capacity to recover from increasing losses to drought, fire, and harvest. A synthesis of fecundity data from 714 species worldwide allowed us to examine hypotheses that are central to quantifying reproduction, a foundation for assessing fitness in forest trees. Four major findings emerged. First, seed production is not constrained by a strict trade-off between seed size and numbers. Instead, seed numbers vary over ten orders of magnitude, with species that invest in large seeds producing more seeds than expected from the 1:1 trade-off. Second, gymnosperms have lower seed production than angiosperms, potentially due to their extra investments in protective woody cones. Third, nutrient-demanding species, indicated by high foliar phosphorus concentrations, have low seed production. Finally, sensitivity of individual species to soil fertility varies widely, limiting the response of community seed production to fertility gradients. In combination, these findings can inform models of forest response that need to incorporate reproductive potential.

Published
2022

4. The Relationship Between Maturation Size and Maximum Tree Size From Tropical to Boreal Climates.

Author

Journé V, Bogdziewicz M, Courbaud B, Kunstler G, Qiu T, Acuña MA, Ascoli D, Bergeron Y, Berveiller D, Boivin T, Bonal R, Caignard T, Cailleret M, Calama R, Camarero JJ, Chang-Yang CH, Chave J, Chianucci F, Curt T, Cutini A, Das A, Daskalakou E, Davi H, Delpierre N, Delzon S, Dietze M, Calderon SD, Dormont L, Espelta JM, Farfan-Rios W, Fenner M, Franklin J, Gehring C, Gilbert G, Gratzer G, Greenberg CH, Guignabert A, Guo Q, Hacket-Pain A, Hampe A, Han Q, Hanley ME, Lambers JHR, Holík J, Hoshizaki K, Ibanez I, Johnstone JF, Knops JMH, Kobe RK, Kurokawa H, Lageard J, LaMontagne J, Ledwon M, Lefèvre F, Leininger T, Limousin JM, Lutz J, Macias D, Mårell A, McIntire E, Moran EV, Motta R, Myers J, Nagel TA, Naoe S, Noguchi M, Norghauer J, Oguro M, Ourcival JM, Parmenter R, Pearse I, Pérez-Ramos IM, Piechnik Ł, Podgórski T, Poulsen J, Redmond MD, Reid CD, Samonil P, Scher CL, Schlesinger WH, Seget B, Sharma S, Shibata M, Silman M, Steele M, Stephenson N, Straub J, Sutton S, Swenson JJ, Swift M, Thomas PA, Uriarte M, Vacchiano G, Whipple A, Whitham T, Wright SJ, Zhu K, Zimmerman J, Żywiec M, and Clark JS

Subjects
Climate Change, Reproduction, Forests, Trees growth & development, Tropical Climate
Abstract

The fundamental trade-off between current and future reproduction has long been considered to result in a tendency for species that can grow large to begin reproduction at a larger size. Due to the prolonged time required to reach maturity, estimates of tree maturation size remain very rare and we lack a global view on the generality and the shape of this trade-off. Using seed production from five continents, we estimate tree maturation sizes for 486 tree species spanning tropical to boreal climates. Results show that a species' maturation size increases with maximum size, but in a non-proportional way: the largest species begin reproduction at smaller sizes than would be expected if maturation were simply proportional to maximum size. Furthermore, the decrease in relative maturation size is steepest in cold climates. These findings on maturation size drivers are key to accurately represent forests' responses to disturbance and climate change., (© 2024 John Wiley & Sons Ltd.)

Published
2024
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5. Masting is uncommon in trees that depend on mutualist dispersers in the context of global climate and fertility gradients.

Author

Qiu T, Aravena MC, Ascoli D, Bergeron Y, Bogdziewicz M, Boivin T, Bonal R, Caignard T, Cailleret M, Calama R, Calderon SD, Camarero JJ, Chang-Yang CH, Chave J, Chianucci F, Courbaud B, Cutini A, Das AJ, Delpierre N, Delzon S, Dietze M, Dormont L, Espelta JM, Fahey TJ, Farfan-Rios W, Franklin JF, Gehring CA, Gilbert GS, Gratzer G, Greenberg CH, Guignabert A, Guo Q, Hacket-Pain A, Hampe A, Han Q, Holik J, Hoshizaki K, Ibanez I, Johnstone JF, Journé V, Kitzberger T, Knops JMH, Kunstler G, Kurokawa H, Lageard JGA, LaMontagne JM, Lefevre F, Leininger T, Limousin JM, Lutz JA, Macias D, Marell A, McIntire EJB, Moore CM, Moran E, Motta R, Myers JA, Nagel TA, Naoe S, Noguchi M, Oguro M, Parmenter R, Pearse IS, Perez-Ramos IM, Piechnik L, Podgorski T, Poulsen J, Redmond MD, Reid CD, Rodman KC, Rodriguez-Sanchez F, Samonil P, Sanguinetti JD, Scher CL, Seget B, Sharma S, Shibata M, Silman M, Steele MA, Stephenson NL, Straub JN, Sutton S, Swenson JJ, Swift M, Thomas PA, Uriarte M, Vacchiano G, Whipple AV, Whitham TG, Wion AP, Wright SJ, Zhu K, Zimmerman JK, Zywiec M, and Clark JS

Subjects
Fertility, Seeds, Satiation, Trees, Reproduction
Abstract

The benefits of masting (volatile, quasi-synchronous seed production at lagged intervals) include satiation of seed predators, but these benefits come with a cost to mutualist pollen and seed dispersers. If the evolution of masting represents a balance between these benefits and costs, we expect mast avoidance in species that are heavily reliant on mutualist dispersers. These effects play out in the context of variable climate and site fertility among species that vary widely in nutrient demand. Meta-analyses of published data have focused on variation at the population scale, thus omitting periodicity within trees and synchronicity between trees. From raw data on 12 million tree-years worldwide, we quantified three components of masting that have not previously been analysed together: (i) volatility, defined as the frequency-weighted year-to-year variation; (ii) periodicity, representing the lag between high-seed years; and (iii) synchronicity, indicating the tree-to-tree correlation. Results show that mast avoidance (low volatility and low synchronicity) by species dependent on mutualist dispersers explains more variation than any other effect. Nutrient-demanding species have low volatility, and species that are most common on nutrient-rich and warm/wet sites exhibit short periods. The prevalence of masting in cold/dry sites coincides with climatic conditions where dependence on vertebrate dispersers is less common than in the wet tropics. Mutualist dispersers neutralize the benefits of masting for predator satiation, further balancing the effects of climate, site fertility and nutrient demands., (© 2023. The Author(s), under exclusive licence to Springer Nature Limited.)

Published
2023
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6. Limits to reproduction and seed size-number trade-offs that shape forest dominance and future recovery.

Author

Qiu T, Andrus R, Aravena MC, Ascoli D, Bergeron Y, Berretti R, Berveiller D, Bogdziewicz M, Boivin T, Bonal R, Bragg DC, Caignard T, Calama R, Camarero JJ, Chang-Yang CH, Cleavitt NL, Courbaud B, Courbet F, Curt T, Das AJ, Daskalakou E, Davi H, Delpierre N, Delzon S, Dietze M, Calderon SD, Dormont L, Espelta J, Fahey TJ, Farfan-Rios W, Gehring CA, Gilbert GS, Gratzer G, Greenberg CH, Guo Q, Hacket-Pain A, Hampe A, Han Q, Hille Ris Lambers J, Hoshizaki K, Ibanez I, Johnstone JF, Journé V, Kabeya D, Kilner CL, Kitzberger T, Knops JMH, Kobe RK, Kunstler G, Lageard JGA, LaMontagne JM, Ledwon M, Lefevre F, Leininger T, Limousin JM, Lutz JA, Macias D, McIntire EJB, Moore CM, Moran E, Motta R, Myers JA, Nagel TA, Noguchi K, Ourcival JM, Parmenter R, Pearse IS, Perez-Ramos IM, Piechnik L, Poulsen J, Poulton-Kamakura R, Redmond MD, Reid CD, Rodman KC, Rodriguez-Sanchez F, Sanguinetti JD, Scher CL, Schlesinger WH, Schmidt Van Marle H, Seget B, Sharma S, Silman M, Steele MA, Stephenson NL, Straub JN, Sun IF, Sutton S, Swenson JJ, Swift M, Thomas PA, Uriarte M, Vacchiano G, Veblen TT, Whipple AV, Whitham TG, Wion AP, Wright B, Wright SJ, Zhu K, Zimmerman JK, Zlotin R, Zywiec M, and Clark JS

Subjects
Fertility, Reproduction, Trees, Forests, Seeds physiology
Abstract

The relationships that control seed production in trees are fundamental to understanding the evolution of forest species and their capacity to recover from increasing losses to drought, fire, and harvest. A synthesis of fecundity data from 714 species worldwide allowed us to examine hypotheses that are central to quantifying reproduction, a foundation for assessing fitness in forest trees. Four major findings emerged. First, seed production is not constrained by a strict trade-off between seed size and numbers. Instead, seed numbers vary over ten orders of magnitude, with species that invest in large seeds producing more seeds than expected from the 1:1 trade-off. Second, gymnosperms have lower seed production than angiosperms, potentially due to their extra investments in protective woody cones. Third, nutrient-demanding species, indicated by high foliar phosphorus concentrations, have low seed production. Finally, sensitivity of individual species to soil fertility varies widely, limiting the response of community seed production to fertility gradients. In combination, these findings can inform models of forest response that need to incorporate reproductive potential., (© 2022. The Author(s).)

Published
2022
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