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  • 1
    In: Galemys, Spanish Journal of Mammalogy, Sociedad Espanola para la Conservacion y Estudio de los Mamiferos (SECEM), Vol. 30 ( 2018-12-31), p. 66-70
    Type of Medium: Online Resource
    ISSN: 1137-8700 , 2254-8408
    URL: Issue
    Language: Unknown
    Publisher: Sociedad Espanola para la Conservacion y Estudio de los Mamiferos (SECEM)
    Publication Date: 2018
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  • 2
    Online Resource
    Online Resource
    CSIRO Publishing ; 2019
    In:  Australian Journal of Botany Vol. 67, No. 2 ( 2019), p. 159-
    In: Australian Journal of Botany, CSIRO Publishing, Vol. 67, No. 2 ( 2019), p. 159-
    Abstract: Herbivory is one of the most important threats that plants face during early stages of development. Previous studies have indicated that seed size and seedling ontogeny strongly influence the response to herbivory at the seedling stage. However, little is known about their interactive effect. We simulated herbivory on seedlings of the exotic Gleditsia triacanthos L. and evaluated the combined effects of seed size and ontogenetic stage at which herbivory occurred on tolerance to herbivory. A greenhouse experiment was performed, with three non-overlapping levels of seed size. Seedlings from each seed size were clipped at two ontogenetic stages (two and five leaves). After three weeks, seedling survival, height, leaf number and dry biomass were measured. Damaged seedlings were not able to reach the size of the undamaged ones. Seedlings from small seeds showed the lowest values in most of the growth variables. Seedlings cut at two-leaf stage showed a higher compensation capacity than those cut at five-leaf stage. Seedlings from large seeds cut at ontogenetic stage I showed the highest compensation capacity in most of the variables. Partly compensating herbivory at this stage may be an advantage for the expansion of this exotic species to new areas.
    Type of Medium: Online Resource
    ISSN: 0067-1924
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 1496155-6
    SSG: 12
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  • 3
    In: Fire Ecology, Springer Science and Business Media LLC, Vol. 17, No. 1 ( 2021-12)
    Type of Medium: Online Resource
    ISSN: 1933-9747
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2575363-0
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  • 4
    In: Australian Journal of Botany, CSIRO Publishing, Vol. 60, No. 4 ( 2012), p. 368-
    Abstract: Ecological theory predicts that the success of exotic plants in new environments depends on a combination of both regenerative and vegetative attributes. Identifying those attributes may benefit from approaches that specifically compare related exotic and native species, thereby overcoming strong habitat dependence and phylogenetic bias. Gleditsia triacanthos L. (Fabaceae) is described as an aggressive woody invader in a broad range of ecosystems of Argentina, where it coexists with other leguminous trees. In the present study, we assessed whether the success of G. triacanthos in the lower areas of Chaco woodlands of central Argentina is determined (1) by differences from the dominant native, Prosopis alba, in its combination of several attributes that enhance the invader’s competitive ability, (2) by differences from P. alba in few key attributes that facilitate its spread, or (3) by strong functional similarities in response to environmental filtering by the invaded system. Our comparison of 19 functional traits of both species showed that regenerative and vegetative trends may vary independently, and that two contrasting strategies seem to underlie the success of G. triacanthos in this region. On the one hand, the invader might benefit by sharing regenerative attributes with the native relative that dominates the community, which is evidently a successful way of recruiting in the system. On the other hand, as recruitment is ensured, the species differs in several vegetative attributes, which may enhance its competitive ability in terms of growth rates and nutrient uptake.
    Type of Medium: Online Resource
    ISSN: 0067-1924
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 1496155-6
    SSG: 12
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  • 5
    In: Fire Ecology, Springer Science and Business Media LLC, Vol. 17, No. 1 ( 2021-12)
    Abstract: El fuego es un importante modulador de la dinámica de los ecosistemas en el mundo. Sin embargo, el conocimiento a gran escala de los patrones de respuesta de ecosistemas y organismos es aún escaso. A través de una revisión sistemática cuantitativa de los estudios disponibles a lo largo de Sudamérica, abordamos los efectos del fuego sobre la biodiversidad, abundancia de diferentes organismos ( i.e., plantas, hongos, invertebrados y vertebrados), aptitud de las plantas y propiedades del suelo bajo diferentes condiciones climáticas ( i.e., cuatro tipos climáticos), y tiempo transcurrido desde el último incendio ( i.e., tiempo post-fuego temprano y tardío). Respondimos: (1) ¿Qué efectos del fuego se han estudiado en Sudamérica? (2) ¿Cuáles son las respuestas generales de la biodiversidad, abundancia, aptitud y propiedades del suelo al fuego? (3) ¿Cómo el clima y el tiempo post-fuego modulan esas respuestas? Resultados Analizamos 160 artículos que reportaron 1465 respuestas al fuego de sitios apareados quemados y no quemados. No encontramos efectos del fuego sobre la biodiversidad y abundancia de invertebrados, encontramos efectos negativos sobre la abundancia de especies de plantas leñosas y de vertebrados, y un incremento en la aptitud de los arbustos. El suelo en sitios quemados tuvo mayor densidad aparente y pH, y menor materia orgánica y Nitrógeno. El efecto del fuego fue significativamente más positivo en tiempos post-fuego tempranos que en tardíos para aptitud de las plantas, y para el Fósforo y Nitrógeno disponible del suelo. Además, encontramos efectos negativos más fuertes en climas semiáridos que en climas húmedos cálidos, sugiriendo que altas temperaturas y disponibilidad de agua permiten una mayor recuperación de los ecosistemas después del fuego. Conclusiones Nuestro estudio destaca la complejidad de las relaciones clima–fuego–vegetación para abordar las respuestas de las propiedades del suelo y de diferentes organismos a varios niveles. La resiliencia observada en la biodiversidad puede ser esperada dado el alto número de ecosistemas propensos al fuego en Sudamérica. La recuperación de la abundancia de invertebrados, la reducción de la abundancia de vertebrados, y las pérdidas de Nitrógeno y Materia Orgánica coincide con las respuestas encontradas en revisiones globales en tiempos cortos después del fuego. La tendencia de estas respuestas estuvo además influenciada por el tipo de clima y tiempo post fuego. Nuestra síntesis provee el primer diagnóstico a gran escala de los efectos del fuego en Sudamérica, ayudando a visualizar las fortalezas, debilidades y vacíos en los estudios del fuego. También brinda información muy necesaria para el desarrollo de estrategias adecuadas de manejo en un continente en el cual el fuego juega un papel socio-ecológico preponderante.
    Type of Medium: Online Resource
    ISSN: 1933-9747
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2575363-0
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  • 6
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2014
    In:  Seed Science Research Vol. 24, No. 1 ( 2014-03), p. 71-77
    In: Seed Science Research, Cambridge University Press (CUP), Vol. 24, No. 1 ( 2014-03), p. 71-77
    Abstract: Seed size is one of the most important traits in the regenerative phase of a plant's life cycle; however, for cactus species the relationship of seed size and germination characteristics and seedling traits is still unclear. We studied the relationship between seed mass and germination and seedling characteristics in 17 cactus species from central Argentina, belonging to different genera and life forms. We measured seed mass, total seed germination, light requirements for germination and mean time to germination for these 17 cacti species; in addition, we recorded seedling size and shape in 15 species. To test light requirements we performed germination experiments under laboratory conditions at 25/15°C (day/night temperatures) and under light or dark conditions. We also calculated seedling volume by measuring seedling height and width. A shape index was obtained by dividing height by width (a value of 1 indicates ‘globose’ seedlings, whereas, as this value increases, seedlings become ‘columnar’). We found no significant relationship between seed mass and any of the germination characteristics considered. However, species with heavier seeds produced bigger seedlings, which were more cylindrical. Adult growth was not totally determined by seedling ‘growth form’, because some species that had globose seedlings were columnar at the adult stage.
    Type of Medium: Online Resource
    ISSN: 0960-2585 , 1475-2735
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2014
    detail.hit.zdb_id: 2016354-X
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    FapUNIFESP (SciELO) ; 2017
    In:  Acta Botanica Brasilica Vol. 31, No. 1 ( 2017-03-13), p. 141-146
    In: Acta Botanica Brasilica, FapUNIFESP (SciELO), Vol. 31, No. 1 ( 2017-03-13), p. 141-146
    Type of Medium: Online Resource
    ISSN: 1677-941X , 0102-3306
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2017
    detail.hit.zdb_id: 2055440-0
    SSG: 12
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  • 8
    In: Forest Ecology and Management, Elsevier BV, Vol. 440 ( 2019-05), p. 189-201
    Type of Medium: Online Resource
    ISSN: 0378-1127
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2019
    detail.hit.zdb_id: 2016648-5
    detail.hit.zdb_id: 751138-3
    SSG: 23
    SSG: 12
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  • 9
    In: Plant Species Biology, Wiley, Vol. 30, No. 2 ( 2015-04), p. 126-136
    Abstract: Identifying plant traits that promote invasiveness has been a major goal in invasion ecology. Germination plays a central role in the life cycle of plants and therefore could be a key trait in determining species invasiveness. In this study, seed germination of two confamilial, co‐occurring species that share ecological characteristics, the exotic invasive Gleditsia triacanthos L and the native Acacia aroma G illies ex. H ook. & A rn., was compared. Seeds were obtained from individuals of three localities in the C haco S errano region of C órdoba, A rgentina. Percent of seed germination and mean germination time were recorded in chemically and mechanically scarified seeds, and the former variable was also recorded in seeds subjected to: passage through the digestive tract of dispersers, fire simulations, fire simulation plus mechanical scarification, seed longevity, and dormancy break over time. In general, both species showed similar germination percentage. However, non‐scarified seeds of the exotic species lost physical dormancy when subjected to experiments of dormancy break over time, whereas, the native species had shorter mean germination time. The greater percentage of seed germination over time of the exotic species than of the native one might be triggering the spread of the former, whereas the shorter mean germination time might be hindering its expansion to more arid regions. The study of different mechanisms for achieving seed germination, particularly in hard seed species, could provide important information on the expansion of invasive species as well as useful knowledge for their management.
    Type of Medium: Online Resource
    ISSN: 0913-557X , 1442-1984
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 2020484-X
    SSG: 12
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  • 10
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2018
    In:  Seed Science Research Vol. 28, No. 1 ( 2018-03), p. 8-15
    In: Seed Science Research, Cambridge University Press (CUP), Vol. 28, No. 1 ( 2018-03), p. 8-15
    Abstract: Differences in fruit morphology among or within species might indicate differences in other regenerative traits, such as seed dormancy and germination. In species with physical dormancy (PY), environmental conditions are suggested to be responsible for dormancy break in field. Seeds of Vachellia caven have PY. This species exhibits two fruit morphs highly represented in Córdoba forests, Argentina: one is dehiscent and the other is indehiscent. In this study we performed a burial experiment with the aim to determine if the differences in V. caven fruit morphology were related to different patterns of PY break of their seeds in field conditions. We related these patterns to (1) environmental conditions that could influence the loss of PY, and (2) histological features of the lens zone. Seeds of both morphs exhibited dormancy break within 14 months of the start of the experiment, but with different patterns. The dehiscent morph showed an abrupt percentage of seeds that broke dormancy 14 months after the beginning of the experiment, probably after undergoing environmental changes similar to those suggested by the two-stage softening model. The indehiscent morph showed a gradual increase in seeds that broke dormancy, not clearly related to any of the environmental variables studied. No differences in seed coat structure of the lens zone were observed between morphs. The existence of both morphs could confer the species with higher possibilities of establishing and coping with environmental heterogeneity. Those characteristics contribute to the understanding of the success of this species in open and disturbed environments.
    Type of Medium: Online Resource
    ISSN: 0960-2585 , 1475-2735
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2018
    detail.hit.zdb_id: 2016354-X
    SSG: 12
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