Factors affecting establishment success of the endangered Caribbean cactus Harrisia portoricensis (Cactaceae)
Early plant stages may be the most vulnerable within the life cycle of plants especially in arid ecosystems. Interference from exotic species may exacerbate this condition. We evaluated germination, seedling survival and growth in the endangered Caribbean cactus Harrisia portoricensis, as a function...
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| Format: | Article |
| Language: | English |
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Vicerractoría Investigación
2012-06-01
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| Series: | Revista de Biología Tropical |
| Subjects: | |
| Online Access: | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442012000200028&lng=en&tlng=en |
| _version_ | 1797709205138833408 |
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| author | Julissa Rojas-Sandoval Elvia Meléndez-Ackerman |
| author_facet | Julissa Rojas-Sandoval Elvia Meléndez-Ackerman |
| author_sort | Julissa Rojas-Sandoval |
| collection | DOAJ |
| description | Early plant stages may be the most vulnerable within the life cycle of plants especially in arid ecosystems. Interference from exotic species may exacerbate this condition. We evaluated germination, seedling survival and growth in the endangered Caribbean cactus Harrisia portoricensis, as a function of sunlight exposure (i.e., growing under open and shaded areas), different shade providers (i.e., growing under two native shrubs and one exotic grass species), two levels of predation (i.e., exclusion and non-exclusion) and variable microenvironmental conditions (i.e., temperature, PAR, humidity). Field experiments demonstrated that suitable conditions for germination and establishment of H. portoricensis seedling are optimal in shaded areas beneath the canopy of established species, but experiments also demonstrated that the identity of the shade provider can have a significant influence on the outcome of these processes. Harrisia portoricensis seedlings had higher probabilities of survival and grew better (i.e., larger diameters) when they were transplanted beneath the canopy of native shrubs, than beneath the exotic grass species, where temperature and solar radiation values were on average much higher than those obtained under the canopies of native shrubs. We also detected that exclusión from potential predators did not increase seedling survival. Our combined results for H. portoricensis suggested that the modification of microenvironmental conditions by the exotic grass may lower the probability of recruitment and establishment of this endangered cactus species. Rev. Biol. Trop. 60 (2): 867-879. Epub 2012 June 01. |
| first_indexed | 2024-03-12T06:32:58Z |
| format | Article |
| id | doaj.art-6549f717951548c4b00ad8b0d1b82cd2 |
| institution | Directory Open Access Journal |
| issn | 0034-7744 |
| language | English |
| last_indexed | 2024-03-12T06:32:58Z |
| publishDate | 2012-06-01 |
| publisher | Vicerractoría Investigación |
| record_format | Article |
| series | Revista de Biología Tropical |
| spelling | doaj.art-6549f717951548c4b00ad8b0d1b82cd22023-09-03T01:30:11ZengVicerractoría InvestigaciónRevista de Biología Tropical0034-77442012-06-01602867879S0034-77442012000200028Factors affecting establishment success of the endangered Caribbean cactus Harrisia portoricensis (Cactaceae)Julissa Rojas-Sandoval0Elvia Meléndez-Ackerman1University of Puerto RicoUniversity of Puerto RicoEarly plant stages may be the most vulnerable within the life cycle of plants especially in arid ecosystems. Interference from exotic species may exacerbate this condition. We evaluated germination, seedling survival and growth in the endangered Caribbean cactus Harrisia portoricensis, as a function of sunlight exposure (i.e., growing under open and shaded areas), different shade providers (i.e., growing under two native shrubs and one exotic grass species), two levels of predation (i.e., exclusion and non-exclusion) and variable microenvironmental conditions (i.e., temperature, PAR, humidity). Field experiments demonstrated that suitable conditions for germination and establishment of H. portoricensis seedling are optimal in shaded areas beneath the canopy of established species, but experiments also demonstrated that the identity of the shade provider can have a significant influence on the outcome of these processes. Harrisia portoricensis seedlings had higher probabilities of survival and grew better (i.e., larger diameters) when they were transplanted beneath the canopy of native shrubs, than beneath the exotic grass species, where temperature and solar radiation values were on average much higher than those obtained under the canopies of native shrubs. We also detected that exclusión from potential predators did not increase seedling survival. Our combined results for H. portoricensis suggested that the modification of microenvironmental conditions by the exotic grass may lower the probability of recruitment and establishment of this endangered cactus species. Rev. Biol. Trop. 60 (2): 867-879. Epub 2012 June 01.http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442012000200028&lng=en&tlng=encactus columnaresHarrisia portoricensisMegathrysus maximusIsla de Monaplantas nodrizagerminación de semillassupervivencia de plántulas |
| spellingShingle | Julissa Rojas-Sandoval Elvia Meléndez-Ackerman Factors affecting establishment success of the endangered Caribbean cactus Harrisia portoricensis (Cactaceae) Revista de Biología Tropical cactus columnares Harrisia portoricensis Megathrysus maximus Isla de Mona plantas nodriza germinación de semillas supervivencia de plántulas |
| title | Factors affecting establishment success of the endangered Caribbean cactus Harrisia portoricensis (Cactaceae) |
| title_full | Factors affecting establishment success of the endangered Caribbean cactus Harrisia portoricensis (Cactaceae) |
| title_fullStr | Factors affecting establishment success of the endangered Caribbean cactus Harrisia portoricensis (Cactaceae) |
| title_full_unstemmed | Factors affecting establishment success of the endangered Caribbean cactus Harrisia portoricensis (Cactaceae) |
| title_short | Factors affecting establishment success of the endangered Caribbean cactus Harrisia portoricensis (Cactaceae) |
| title_sort | factors affecting establishment success of the endangered caribbean cactus harrisia portoricensis cactaceae |
| topic | cactus columnares Harrisia portoricensis Megathrysus maximus Isla de Mona plantas nodriza germinación de semillas supervivencia de plántulas |
| url | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442012000200028&lng=en&tlng=en |
| work_keys_str_mv | AT julissarojassandoval factorsaffectingestablishmentsuccessoftheendangeredcaribbeancactusharrisiaportoricensiscactaceae AT elviamelendezackerman factorsaffectingestablishmentsuccessoftheendangeredcaribbeancactusharrisiaportoricensiscactaceae |