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1. Seed mass affects emergence but not germination in native grassland forage species.

Author

Milano, Clara, Pérez, Daniel Roberto, Scarfó, María Cecilia, Rodríguez, Dana Aylen, Cuppari, Selva Yanet, and Loydi, Alejandro

Subjects
GRASSLAND restoration, SEED size, RESTORATION ecology, GERMINATION, GRASSLANDS
Abstract

For ecological restoration of degraded grasslands, species selection and knowledge of the species biology are essential. Seed germination and seedling establishment, as well as seed regenerative traits, can partially determine direct seeding success in this context. The objectives of this study are (1) to characterize the seeds of 29 native forage species of the Pampa Austral grasslands, (2) to evaluate their germination and emergence, and (3) to evaluate the relationship between germination and emergence and seed traits (mass, length, width, and length/width ratio), to test the usefulness of these traits for rapid species selection. We studied the germination percentage of untreated (UG) and treated (TG) seeds under laboratory conditions of 29 native forage species (four legumes, nine cool season, and 16 warm‐season grasses) and the percentage of field emergence (FE) for 17 of those species, selected based on their UG. Additionally, all species were characterized, including thousand‐seed mass, length, width, and length/width ratio. Average UG was 53.30 ± 3.17% for Poaceae and 25.63 ± 5.73% for Fabaceae. Four cool season and eight warm‐season grasses had UG greater than 60%. Mean FE was 35.18 ± 0.66% 2 months after sowing. FE has a direct relationship with seed mass (r2 = 0.69; p < 0.001), while this relationship was not observed for UG under laboratory conditions (r2 = 0.15; p = 0.7174). In Pampa Austral grasslands, seed mass proved to be a relevant trait for species selection given its strong relationship with FE. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Extreme drought impacts have been underestimated in grasslands and shrublands globally

Author

Universidad de Alicante. Departamento de Ecología, Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef", Smith, Melinda D., Wilkins, Kate D., Holdrege, Martin C., Wilfahrt, Peter, Collins, Scott L., Knapp, Alan K., Sala, Osvaldo, Dukes, Jeffrey S., Phillips, Richard P., Yahdjian, Laura, Gherardi, Laureano A., An, Hui, Anacker, Brian, Anderson, Maggie, Auge, Harald, Bachle, Seton, Bahalkeh, Khadijeh, Bahn, Michael, Batbaatar, Amgaa, Bauerle, Taryn, Beard, Karen H., Loydi, Alejandro, Behn, Kai, Beil, Ilka, Biancari, Lucio, Blindow, Irmgard, Bondaruk, Viviana Florencia, Borer, Elizabeth T., Bork, Edward W., Bruschetti, Carlos Martin, Byrne, Kerry M., Cahill Jr., James F., Luan, Junwei, Calvo, Dianela A., Carbognani, Michele, Cardoni, Augusto, Carlyle, Cameron N., Castillo-Garcia, Miguel, Chang, Scott X., Chieppa, Jeff, Cianciaruso, Marcus V., Cohen, Ofer, Cordeiro, Amanda L., Lubbe, Frederick Curtis, Cusack, Daniela F., Dahlke, Sven, Daleo, Pedro, D'Antonio, Carla M., Dietterich, Lee H., Doherty, Tim S., Dubbert, Maren, Ebeling, Anne, Eisenhauer, Nico, Fischer, Felícia M., Macfarlane, Craig, Forte, T'ai G.W., Gebauer, Tobias, Gozalo, Beatriz, Greenville, Aaron C., Guidoni-Martins, Karlo G., Hannusch, Heather J., Haugum, Siri Vatsø, Hautier, Yann, Hefting, Mariet, Henry, Hugh A.L., Mackie-Haas, Kathleen, Hoss, Daniela, Ingrisch, Johannes, Iribarne, Oscar, Isbell, Forest, Johnson, Yari, Jordan, Samuel, Kelly, Eugene F., Kimmel, Kaitlin, Kreyling, Juergen, Kröel-Dulay, György, Malyshev, Andrey V., Kröpfl, Alicia, Kübert, Angelika, Kulmatiski, Andrew, Lamb, Eric G., Larsen, Klaus Steenberg, Larson, Julie, Lawson, Jason, Leder, Cintia V., Linstädter, Anja, Liu, Jielin, Maturano-Ruiz, Adrián, Liu, Shirong, Lodge, Alexandra G., Longo, Grisel, Merchant, Thomas, Metcalfe, Daniel B., Mori, Akira S., Ohlert, Timothy, Mudongo, Edwin, Newman, Gregory S., Nielsen, Uffe N., Nimmo, Dale, Niu, Yujie, Nobre, Paola, O'Connor, Rory C., Ogaya, Romà, Oñatibia, Gastón R., Orbán, Ildikó, Beier, Claus, Osborne, Brooke, Otfinowski, Rafael, Pärtel, Meelis, Peñuelas Reixach, Josep, Peri, Pablo L., Peter, Guadalupe, Petraglia, Alessandro, Picon-Cochard, Catherine, Pillar, Valério D., Piñeiro-Guerra, Juan Manuel, Fraser, Lauchlan H., Ploughe, Laura W., Plowes, Robert M., Portales-Reyes, Cristy, Prober, Suzanne M., Pueyo, Yolanda, Reed, Sasha C., Ritchie, Euan G., Rodríguez, Dana Aylén, Rogers, William E., Roscher, Christiane, Jentsch, Anke, Sánchez, Ana M., Santos, Bráulio A., Scarfó, María Cecilia, Seabloom, Eric W., Shi, Baoku, Souza, Lara, Stampfli, Andreas, Standish, Rachel J., Sternberg, Marcelo, Sun, Wei, Loik, Michael E., Sünnemann, Marie, Tedder, Michelle, Thorvaldsen, Pål, Tian, Dashuan, Tielbörger, Katja, Valdecantos, Alejandro, van den Brink, Liesbeth, Vandvik, Vigdis, Vankoughnett, Mathew R., Velle, Liv Guri, Maestre, Fernando T., Wang, Changhui, Wang, Yi, Wardle, Glenda M., Werner, Christiane, Wei, Cunzheng, Wiehl, Georg, Williams, Jennifer L., Wolf, Amelia A., Zeiter, Michaela, Zhang, Fawei, Power, Sally A., Zhu, Juntao, Zong, Ning, Zuo, Xiaoan, Yu, Qiang, Felton, Andrew J., Munson, Seth M., Luo, Yiqi, Abdoli, Hamed, Abedi, Mehdi, Alados, Concepción L., Alberti, Juan, Alon, Moshe, Universidad de Alicante. Departamento de Ecología, Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef", Smith, Melinda D., Wilkins, Kate D., Holdrege, Martin C., Wilfahrt, Peter, Collins, Scott L., Knapp, Alan K., Sala, Osvaldo, Dukes, Jeffrey S., Phillips, Richard P., Yahdjian, Laura, Gherardi, Laureano A., An, Hui, Anacker, Brian, Anderson, Maggie, Auge, Harald, Bachle, Seton, Bahalkeh, Khadijeh, Bahn, Michael, Batbaatar, Amgaa, Bauerle, Taryn, Beard, Karen H., Loydi, Alejandro, Behn, Kai, Beil, Ilka, Biancari, Lucio, Blindow, Irmgard, Bondaruk, Viviana Florencia, Borer, Elizabeth T., Bork, Edward W., Bruschetti, Carlos Martin, Byrne, Kerry M., Cahill Jr., James F., Luan, Junwei, Calvo, Dianela A., Carbognani, Michele, Cardoni, Augusto, Carlyle, Cameron N., Castillo-Garcia, Miguel, Chang, Scott X., Chieppa, Jeff, Cianciaruso, Marcus V., Cohen, Ofer, Cordeiro, Amanda L., Lubbe, Frederick Curtis, Cusack, Daniela F., Dahlke, Sven, Daleo, Pedro, D'Antonio, Carla M., Dietterich, Lee H., Doherty, Tim S., Dubbert, Maren, Ebeling, Anne, Eisenhauer, Nico, Fischer, Felícia M., Macfarlane, Craig, Forte, T'ai G.W., Gebauer, Tobias, Gozalo, Beatriz, Greenville, Aaron C., Guidoni-Martins, Karlo G., Hannusch, Heather J., Haugum, Siri Vatsø, Hautier, Yann, Hefting, Mariet, Henry, Hugh A.L., Mackie-Haas, Kathleen, Hoss, Daniela, Ingrisch, Johannes, Iribarne, Oscar, Isbell, Forest, Johnson, Yari, Jordan, Samuel, Kelly, Eugene F., Kimmel, Kaitlin, Kreyling, Juergen, Kröel-Dulay, György, Malyshev, Andrey V., Kröpfl, Alicia, Kübert, Angelika, Kulmatiski, Andrew, Lamb, Eric G., Larsen, Klaus Steenberg, Larson, Julie, Lawson, Jason, Leder, Cintia V., Linstädter, Anja, Liu, Jielin, Maturano-Ruiz, Adrián, Liu, Shirong, Lodge, Alexandra G., Longo, Grisel, Merchant, Thomas, Metcalfe, Daniel B., Mori, Akira S., Ohlert, Timothy, Mudongo, Edwin, Newman, Gregory S., Nielsen, Uffe N., Nimmo, Dale, Niu, Yujie, Nobre, Paola, O'Connor, Rory C., Ogaya, Romà, Oñatibia, Gastón R., Orbán, Ildikó, Beier, Claus, Osborne, Brooke, Otfinowski, Rafael, Pärtel, Meelis, Peñuelas Reixach, Josep, Peri, Pablo L., Peter, Guadalupe, Petraglia, Alessandro, Picon-Cochard, Catherine, Pillar, Valério D., Piñeiro-Guerra, Juan Manuel, Fraser, Lauchlan H., Ploughe, Laura W., Plowes, Robert M., Portales-Reyes, Cristy, Prober, Suzanne M., Pueyo, Yolanda, Reed, Sasha C., Ritchie, Euan G., Rodríguez, Dana Aylén, Rogers, William E., Roscher, Christiane, Jentsch, Anke, Sánchez, Ana M., Santos, Bráulio A., Scarfó, María Cecilia, Seabloom, Eric W., Shi, Baoku, Souza, Lara, Stampfli, Andreas, Standish, Rachel J., Sternberg, Marcelo, Sun, Wei, Loik, Michael E., Sünnemann, Marie, Tedder, Michelle, Thorvaldsen, Pål, Tian, Dashuan, Tielbörger, Katja, Valdecantos, Alejandro, van den Brink, Liesbeth, Vandvik, Vigdis, Vankoughnett, Mathew R., Velle, Liv Guri, Maestre, Fernando T., Wang, Changhui, Wang, Yi, Wardle, Glenda M., Werner, Christiane, Wei, Cunzheng, Wiehl, Georg, Williams, Jennifer L., Wolf, Amelia A., Zeiter, Michaela, Zhang, Fawei, Power, Sally A., Zhu, Juntao, Zong, Ning, Zuo, Xiaoan, Yu, Qiang, Felton, Andrew J., Munson, Seth M., Luo, Yiqi, Abdoli, Hamed, Abedi, Mehdi, Alados, Concepción L., Alberti, Juan, and Alon, Moshe

Abstract

Climate change is increasing the frequency and severity of short-term (~1 y) drought events—the most common duration of drought—globally. Yet the impact of this intensification of drought on ecosystem functioning remains poorly resolved. This is due in part to the widely disparate approaches ecologists have employed to study drought, variation in the severity and duration of drought studied, and differences among ecosystems in vegetation, edaphic and climatic attributes that can mediate drought impacts. To overcome these problems and better identify the factors that modulate drought responses, we used a coordinated distributed experiment to quantify the impact of short-term drought on grassland and shrubland ecosystems. With a standardized approach, we imposed ~a single year of drought at 100 sites on six continents. Here we show that loss of a foundational ecosystem function—aboveground net primary production (ANPP)—was 60% greater at sites that experienced statistically extreme drought (1-in-100-y event) vs. those sites where drought was nominal (historically more common) in magnitude (35% vs. 21%, respectively). This reduction in a key carbon cycle process with a single year of extreme drought greatly exceeds previously reported losses for grasslands and shrublands. Our global experiment also revealed high variability in drought response but that relative reductions in ANPP were greater in drier ecosystems and those with fewer plant species. Overall, our results demonstrate with unprecedented rigor that the global impacts of projected increases in drought severity have been significantly underestimated and that drier and less diverse sites are likely to be most vulnerable to extreme drought.

Published
2024

3. Extreme drought impacts have been underestimated in grasslands and shrublands globally

Author

Smith, Melinda D., Wilkins, Kate D., Holdrege, Martin C., Wilfahrt, Peter, Collins, Scott L., Knapp, Alan K., Sala, Osvaldo E., Dukes, Jeffrey S., Phillips, Richard P., Yahdjian, Laura, Gherardi, Laureano A., Ohlert, Timothy, Beier, Claus, Fraser, Lauchlan H., Jentsch, Anke, Loik, Michael E., Maestre, Fernando T., Power, Sally A., Yu, Qiang, Felton, Andrew J., Munson, Seth M., Luo, Yiqi, Abdoli, Hamed, Abedi, Mehdi, Alados, Concepción L., Alberti, Juan, Alon, Moshe, An, Hui, Anacker, Brian, Anderson, Maggie, Auge, Harald, Bachle, Seton, Bahalkeh, Khadijeh, Bahn, Michael, Batbaatar, Amgaa, Bauerle, Taryn, Beard, Karen H., Behn, Kai, Beil, Ilka, Biancari, Lucio, Blindow, Irmgard, Bondaruk, Viviana Florencia, Borer, Elizabeth T., Bork, Edward W., Bruschetti, Carlos Martin, Byrne, Kerry M., Cahill, James F., Calvo, Dianela A., Carbognani, Michele, Cardoni, Augusto, Carlyle, Cameron N., Castillo-Garcia, Miguel, Chang, Scott X., Chieppa, Jeff, Cianciaruso, Marcus V., Cohen, Ofer, Cordeiro, Amanda L., Cusack, Daniela F., Dahlke, Sven, Daleo, Pedro, D'Antonio, Carla M., Dietterich, Lee H., Doherty, Tim S., Dubbert, Maren, Ebeling, Anne, Eisenhauer, Nico, Fischer, Felícia M., Forte, Tai G.W., Gebauer, Tobias, Gozalo, Beatriz, Greenville, Aaron C., Guidoni-Martins, Karlo G., Hannusch, Heather J., Haugum, Siri Vatsø, Hautier, Yann, Hefting, Mariet, Henry, Hugh A.L., Hoss, Daniela, Iribarne, Oscar, Isbell, Forest, Johnson, Yari, Jordan, Samuel, Kelly, Eugene F., Kimmel, Kaitlin, Kreyling, Juergen, Kröel-Dulay, György, Ingrisch, Johannes, Kröpfl, Alicia, Kübert, Angelika, Kulmatiski, Andrew, Lamb, Eric G., Larsen, Klaus Steenberg, Larson, Julie, Leder, Cintia V., Linstädter, Anja, Liu, Jielin, Liu, Shirong, Lodge, Alexandra G., Longo, Grisel, Loydi, Alejandro, Luan, Junwei, Lawson, Jason, Lubbe, Frederick Curtis, Macfarlane, Craig, Mackie-Haas, Kathleen, Malyshev, Andrey V., Maturano-Ruiz, Adrián, Merchant, Thomas, Metcalfe, Daniel B., Mori, Akira S., Mudongo, Edwin, Newman, Gregory S., Nielsen, Uffe N., Nimmo, Dale, Niu, Yujie, Nobre, Paola, O'Connor, Rory C., Ogaya, Romà, Oñatibia, Gastón R., Orbán, Ildikó, Osborne, Brooke, Otfinowski, Rafael, Pärtel, Meelis, Penuelas, Josep, Peri, Pablo L., Peter, Guadalupe, Petraglia, Alessandro, Picon-Cochard, Catherine, Pillar, Valério D., Piñeiro-Guerra, Juan Manuel, Ploughe, Laura W., Plowes, Robert M., Portales-Reyes, Cristy, Prober, Suzanne M., Pueyo, Yolanda, Reed, Sasha C., Ritchie, Euan G., Rodríguez, Dana Aylén, Rogers, William E., Roscher, Christiane, Sánchez, Ana M., Santos, Bráulio A., Scarfó, María Cecilia, Seabloom, Eric W., Shi, Baoku, Souza, Lara, Stampfli, Andreas, Standish, Rachel J., Sternberg, Marcelo, Sun, Wei, Sünnemann, Marie, Tedder, Michelle, Thorvaldsen, Pål, Tian, Dashuan, Tielbörger, Katja, Valdecantos, Alejandro, van den Brink, Liesbeth, Vandvik, Vigdis, Vankoughnett, Mathew R., Velle, Liv Guri, Wang, Changhui, Wang, Yi, Wardle, Glenda M., Werner, Christiane, Wei, Cunzheng, Wiehl, Georg, Williams, Jennifer L., Wolf, Amelia A., Zeiter, Michaela, Zhang, Fawei, Zhu, Juntao, Zong, Ning, Zuo, Xiaoan, Smith, Melinda D., Wilkins, Kate D., Holdrege, Martin C., Wilfahrt, Peter, Collins, Scott L., Knapp, Alan K., Sala, Osvaldo E., Dukes, Jeffrey S., Phillips, Richard P., Yahdjian, Laura, Gherardi, Laureano A., Ohlert, Timothy, Beier, Claus, Fraser, Lauchlan H., Jentsch, Anke, Loik, Michael E., Maestre, Fernando T., Power, Sally A., Yu, Qiang, Felton, Andrew J., Munson, Seth M., Luo, Yiqi, Abdoli, Hamed, Abedi, Mehdi, Alados, Concepción L., Alberti, Juan, Alon, Moshe, An, Hui, Anacker, Brian, Anderson, Maggie, Auge, Harald, Bachle, Seton, Bahalkeh, Khadijeh, Bahn, Michael, Batbaatar, Amgaa, Bauerle, Taryn, Beard, Karen H., Behn, Kai, Beil, Ilka, Biancari, Lucio, Blindow, Irmgard, Bondaruk, Viviana Florencia, Borer, Elizabeth T., Bork, Edward W., Bruschetti, Carlos Martin, Byrne, Kerry M., Cahill, James F., Calvo, Dianela A., Carbognani, Michele, Cardoni, Augusto, Carlyle, Cameron N., Castillo-Garcia, Miguel, Chang, Scott X., Chieppa, Jeff, Cianciaruso, Marcus V., Cohen, Ofer, Cordeiro, Amanda L., Cusack, Daniela F., Dahlke, Sven, Daleo, Pedro, D'Antonio, Carla M., Dietterich, Lee H., Doherty, Tim S., Dubbert, Maren, Ebeling, Anne, Eisenhauer, Nico, Fischer, Felícia M., Forte, Tai G.W., Gebauer, Tobias, Gozalo, Beatriz, Greenville, Aaron C., Guidoni-Martins, Karlo G., Hannusch, Heather J., Haugum, Siri Vatsø, Hautier, Yann, Hefting, Mariet, Henry, Hugh A.L., Hoss, Daniela, Iribarne, Oscar, Isbell, Forest, Johnson, Yari, Jordan, Samuel, Kelly, Eugene F., Kimmel, Kaitlin, Kreyling, Juergen, Kröel-Dulay, György, Ingrisch, Johannes, Kröpfl, Alicia, Kübert, Angelika, Kulmatiski, Andrew, Lamb, Eric G., Larsen, Klaus Steenberg, Larson, Julie, Leder, Cintia V., Linstädter, Anja, Liu, Jielin, Liu, Shirong, Lodge, Alexandra G., Longo, Grisel, Loydi, Alejandro, Luan, Junwei, Lawson, Jason, Lubbe, Frederick Curtis, Macfarlane, Craig, Mackie-Haas, Kathleen, Malyshev, Andrey V., Maturano-Ruiz, Adrián, Merchant, Thomas, Metcalfe, Daniel B., Mori, Akira S., Mudongo, Edwin, Newman, Gregory S., Nielsen, Uffe N., Nimmo, Dale, Niu, Yujie, Nobre, Paola, O'Connor, Rory C., Ogaya, Romà, Oñatibia, Gastón R., Orbán, Ildikó, Osborne, Brooke, Otfinowski, Rafael, Pärtel, Meelis, Penuelas, Josep, Peri, Pablo L., Peter, Guadalupe, Petraglia, Alessandro, Picon-Cochard, Catherine, Pillar, Valério D., Piñeiro-Guerra, Juan Manuel, Ploughe, Laura W., Plowes, Robert M., Portales-Reyes, Cristy, Prober, Suzanne M., Pueyo, Yolanda, Reed, Sasha C., Ritchie, Euan G., Rodríguez, Dana Aylén, Rogers, William E., Roscher, Christiane, Sánchez, Ana M., Santos, Bráulio A., Scarfó, María Cecilia, Seabloom, Eric W., Shi, Baoku, Souza, Lara, Stampfli, Andreas, Standish, Rachel J., Sternberg, Marcelo, Sun, Wei, Sünnemann, Marie, Tedder, Michelle, Thorvaldsen, Pål, Tian, Dashuan, Tielbörger, Katja, Valdecantos, Alejandro, van den Brink, Liesbeth, Vandvik, Vigdis, Vankoughnett, Mathew R., Velle, Liv Guri, Wang, Changhui, Wang, Yi, Wardle, Glenda M., Werner, Christiane, Wei, Cunzheng, Wiehl, Georg, Williams, Jennifer L., Wolf, Amelia A., Zeiter, Michaela, Zhang, Fawei, Zhu, Juntao, Zong, Ning, and Zuo, Xiaoan

Abstract

Climate change is increasing the frequency and severity of short-term (~1 y) drought events—the most common duration of drought—globally. Yet the impact of this intensification of drought on ecosystem functioning remains poorly resolved. This is due in part to the widely disparate approaches ecologists have employed to study drought, variation in the severity and duration of drought studied, and differences among ecosystems in vegetation, edaphic and climatic attributes that can mediate drought impacts. To overcome these problems and better identify the factors that modulate drought responses, we used a coordinated distributed experiment to quantify the impact of short-term drought on grassland and shrubland ecosystems. With a standardized approach, we imposed ~a single year of drought at 100 sites on six continents. Here we show that loss of a foundational ecosystem function—aboveground net primary production (ANPP)—was 60% greater at sites that experienced statistically extreme drought (1-in-100-y event) vs. those sites where drought was nominal (historically more common) in magnitude (35% vs. 21%, respectively). This reduction in a key carbon cycle process with a single year of extreme drought greatly exceeds previously reported losses for grasslands and shrublands. Our global experiment also revealed high variability in drought response but that relative reductions in ANPP were greater in drier ecosystems and those with fewer plant species. Overall, our results demonstrate with unprecedented rigor that the global impacts of projected increases in drought severity have been significantly underestimated and that drier and less diverse sites are likely to be most vulnerable to extreme drought., Climate change is increasing the frequency and severity of short-term (~1 y) drought events—the most common duration of drought—globally. Yet the impact of this intensification of drought on ecosystem functioning remains poorly resolved. This is due in part to the widely disparate approaches ecologists have employed to study drought, variation in the severity and duration of drought studied, and differences among ecosystems in vegetation, edaphic and climatic attributes that can mediate drought impacts. To overcome these problems and better identify the factors that modulate drought responses, we used a coordinated distributed experiment to quantify the impact of short-term drought on grassland and shrubland ecosystems. With a standardized approach, we imposed ~a single year of drought at 100 sites on six continents. Here we show that loss of a foundational ecosystem function—aboveground net primary production (ANPP)—was 60% greater at sites that experienced statistically extreme drought (1-in-100-y event) vs. those sites where drought was nominal (historically more common) in magnitude (35% vs. 21%, respectively). This reduction in a key carbon cycle process with a single year of extreme drought greatly exceeds previously reported losses for grasslands and shrublands. Our global experiment also revealed high variability in drought response but that relative reductions in ANPP were greater in drier ecosystems and those with fewer plant species. Overall, our results demonstrate with unprecedented rigor that the global impacts of projected increases in drought severity have been significantly underestimated and that drier and less diverse sites are likely to be most vulnerable to extreme drought.

Published
2024

5. Effect of competition intensity on recruitment of palatable and unpalatable grasses

Author

García, Andrés, Scarfó, María Cecilia, Loydi, Alejandro, and Distel, Roberto Alejandro

Subjects
PALATABILITY, SEEDLING RECRUITMENT, CHASCOLYTRUM SUBARISTATUM (LAM.) DESV, CIENCIAS AGRÍCOLAS, COMPETITION, Ganadería, Producción Animal y Lechería, NASSELLA TRICHOTOMA (NEES) HACK. EX ARECHAV
Abstract

In this study, we made an attempt to reveal how competition intensity from established plants impacts on palatable and unpalatable grass seedlings recruitment, in a natural mesic grassland of central Argentina. Our objective was to assess the seedling recruitment of a palatable species (Chascolytrum subaristatum) and an unpalatable species (Nassella trichotoma) in microsites differing in competition intensity from established plants. Identity (C. subaristatum and N. trichotoma) and defoliation severity were used as surrogate for competition intensity. In March 2017, we permanently marked established individuals of N. trichotoma and C. subaristatum and placed two circular plots adjacent to each individual. In one plot we added seeds of N. trichotoma and in the other seeds of C. subaristatum. After seeding, established plants were randomly assigned to one of three level of defoliation: without defoliation, low defoliation severity and high defoliation severity. From April to November 2017 (i.e. over a complete annual growing cycle), we measured seedling density, recruitment and growth. Our results supported the hypothesis that seedlings of palatable grasses are more competitive than seedlings of unpalatable grasses. Seedling of the palatable grass C. subaristatum recruited successfully regardless the intensity of competition from established plants, whereas seedlings of the unpalatable grass N. trichotoma recruited better under low competitive pressure from established plants. Our results suggest that the availability of microsites with low competitive pressure from the established vegetation, created by selective grazing of palatable grasses, promotes the recruitment of unpalatable grass seedlings. This mechanism may contribute to the species replacement process commonly observed in heavy grazed grasslands. Fil: García, Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina Fil: Scarfó, María Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina Fil: Loydi, Alejandro. Universidad Nacional del Sur. Departamento de Biología, Bioquímica y Farmacia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina Fil: Distel, Roberto Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Centro de Recursos Naturales Renovables de la Zona Semiárida. Universidad Nacional del Sur. Centro de Recursos Naturales Renovables de la Zona Semiárida; Argentina. Universidad Nacional del Sur. Departamento de Agronomía; Argentina

Published
2019
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7. Effect of competition intensity on recruitment of palatable and unpalatable grasses.

Author

García, Andrés, Scarfó, María Cecilia, Loydi, Alejandro, and Distel, Roberto Alejandro

Subjects
GRASSES, DEFOLIATION, SEEDS, GRASSLANDS, SOWING, SEEDLINGS
Abstract

In this study, we made an attempt to reveal how competition intensity from established plants impacts on palatable and unpalatable grass seedlings recruitment, in a natural mesic grassland of central Argentina. Our objective was to assess the seedling recruitment of a palatable species (Chascolytrum subaristatum) and an unpalatable species (Nassella trichotoma) in microsites differing in competition intensity from established plants. Identity (C. subaristatum and N. trichotoma) and defoliation severity were used as surrogate for competition intensity. In March 2017, we permanently marked established individuals of N. trichotoma and C. subaristatum and placed two circular plots adjacent to each individual. In one plot we added seeds of N. trichotoma and in the other seeds of C. subaristatum. After seeding, established plants were randomly assigned to one of three level of defoliation: without defoliation, low defoliation severity and high defoliation severity. From April to November 2017 (i.e. over a complete annual growing cycle), we measured seedling density, recruitment and growth. Our results supported the hypothesis that seedlings of palatable grasses are more competitive than seedlings of unpalatable grasses. Seedling of the palatable grass C. subaristatum recruited successfully regardless the intensity of competition from established plants, whereas seedlings of the unpalatable grass N. trichotoma recruited better under low competitive pressure from established plants. Our results suggest that the availability of microsites with low competitive pressure from the established vegetation, created by selective grazing of palatable grasses, promotes the recruitment of unpalatable grass seedlings. This mechanism may contribute to the species replacement process commonly observed in heavy grazed grasslands. [ABSTRACT FROM AUTHOR]

Published
2020
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