Population Structure and Growth Patterns of Opuntia echios Var. gigantea Along an Elevational Gradient in the Galapagos Islands
Cacti growing in forests potentially experience growth limitation due to reduced light availability. To test this hypothesis, we studied the population structure of Opuntia echios var. gigantea at 15 sites on the south side of Isla Santa Cruz, Galapagos Islands, Ecuador. Populations were located in...
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| Veröffentlicht in: | Biotropica 2000-06, Vol.32 (2), p.235-243 |
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| creator | Hicks, David J. Mauchamp, Andre |
| description | Cacti growing in forests potentially experience growth limitation due to reduced light availability. To test this hypothesis, we studied the population structure of Opuntia echios var. gigantea at 15 sites on the south side of Isla Santa Cruz, Galapagos Islands, Ecuador. Populations were located in communities ranging from arid scrub at low elevations to closed-canopy tropical dry forest at higher elevations. Ordination confirmed the existence of a strong elevation-vegetation gradient. Opuntia abundance peaked at lower elevations ( |
| doi_str_mv | 10.1043/0006-3606(2000)032(0235:PSAGPO)2.0.CO;2 |
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To test this hypothesis, we studied the population structure of Opuntia echios var. gigantea at 15 sites on the south side of Isla Santa Cruz, Galapagos Islands, Ecuador. Populations were located in communities ranging from arid scrub at low elevations to closed-canopy tropical dry forest at higher elevations. Ordination confirmed the existence of a strong elevation-vegetation gradient. Opuntia abundance peaked at lower elevations (<ca 30 m), with lower densities in closed-canopy sites. For populations in scrub vegetation, density declined fairly regularly with plant height. Populations in forested sites had few plants of intermediate height, suggesting periodic recruitment. Scrub populations had random dispersion, while those in forests were aggregated. The change in spatial pattern may be related to a change in primary reproductive mode from asexual propagation via fallen fruits to propagation via fallen cladodes. Height was significantly correlated with stem diameter. Intercepts of these relationships increased toward higher elevations, probably in response to the increasing height of the surrounding canopy.</description><identifier>ISSN: 0006-3606</identifier><identifier>EISSN: 1744-7429</identifier><identifier>DOI: 10.1043/0006-3606(2000)032(0235:PSAGPO)2.0.CO;2</identifier><language>eng</language><publisher>Association for Tropical Biology</publisher><subject>Arid zones ; Cactus ; Cladodes ; Dry forests ; Ecuador, Galapagos Is ; Forest canopy ; Forest growth ; Opuntia echios gigantea ; Plant growth ; Plants ; Topographical elevation ; Vegetation</subject><ispartof>Biotropica, 2000-06, Vol.32 (2), p.235-243</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/2663852$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/2663852$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,780,784,803,27924,27925,58017,58250</link.rule.ids></links><search><creatorcontrib>Hicks, David J.</creatorcontrib><creatorcontrib>Mauchamp, Andre</creatorcontrib><title>Population Structure and Growth Patterns of Opuntia echios Var. gigantea Along an Elevational Gradient in the Galapagos Islands</title><title>Biotropica</title><description>Cacti growing in forests potentially experience growth limitation due to reduced light availability. To test this hypothesis, we studied the population structure of Opuntia echios var. gigantea at 15 sites on the south side of Isla Santa Cruz, Galapagos Islands, Ecuador. Populations were located in communities ranging from arid scrub at low elevations to closed-canopy tropical dry forest at higher elevations. Ordination confirmed the existence of a strong elevation-vegetation gradient. Opuntia abundance peaked at lower elevations (<ca 30 m), with lower densities in closed-canopy sites. For populations in scrub vegetation, density declined fairly regularly with plant height. Populations in forested sites had few plants of intermediate height, suggesting periodic recruitment. Scrub populations had random dispersion, while those in forests were aggregated. The change in spatial pattern may be related to a change in primary reproductive mode from asexual propagation via fallen fruits to propagation via fallen cladodes. Height was significantly correlated with stem diameter. Intercepts of these relationships increased toward higher elevations, probably in response to the increasing height of the surrounding canopy.</description><subject>Arid zones</subject><subject>Cactus</subject><subject>Cladodes</subject><subject>Dry forests</subject><subject>Ecuador, Galapagos Is</subject><subject>Forest canopy</subject><subject>Forest growth</subject><subject>Opuntia echios gigantea</subject><subject>Plant growth</subject><subject>Plants</subject><subject>Topographical elevation</subject><subject>Vegetation</subject><issn>0006-3606</issn><issn>1744-7429</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><recordid>eNo9jsFKw0AQhhdRsFbfwMOeRA9JN7PJptFTKbUKQgsWr2W6mbQpaTbubhRPvrqLFU8zA9_3z8_YKBFxIlI5EkKoSCqhbiGsd0LCrQCZ3S9fJ_Pl4g5iEU8XD3DCBkmeplGeQnHKBv_WObtwbh_OIhPpgH0vTdc36GvT8ldve-17Sxzbks-t-fQ7vkTvybaOm4ovur71NXLSu9o4_oY25tt6i60n5JPGtNtg8llDH7-B2IQQLGtqPa9b7nfE59hgh9sgP7smfHGX7KzCxtHV3xyy1eNsNX2KXhbz5-nkJdpnUESZkhrGUI6xIJXpYixSIlVstAZAIRKloNSUY6V0FYASdFpIBZCphKoNZXLIbo6xnTXvPTm_PtROUxM6kOndOsmVzCEpAnh9BPfOG7vubH1A-7UGpeQ4A_kDJk9x1w</recordid><startdate>20000601</startdate><enddate>20000601</enddate><creator>Hicks, David J.</creator><creator>Mauchamp, Andre</creator><general>Association for Tropical Biology</general><scope>7SN</scope><scope>C1K</scope></search><sort><creationdate>20000601</creationdate><title>Population Structure and Growth Patterns of Opuntia echios Var. gigantea Along an Elevational Gradient in the Galapagos Islands</title><author>Hicks, David J. ; Mauchamp, Andre</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-j529-563c282d8a9e65c9804ee69bcc22a001662dce7af6cfe65d2c493622561efbe53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Arid zones</topic><topic>Cactus</topic><topic>Cladodes</topic><topic>Dry forests</topic><topic>Ecuador, Galapagos Is</topic><topic>Forest canopy</topic><topic>Forest growth</topic><topic>Opuntia echios gigantea</topic><topic>Plant growth</topic><topic>Plants</topic><topic>Topographical elevation</topic><topic>Vegetation</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hicks, David J.</creatorcontrib><creatorcontrib>Mauchamp, Andre</creatorcontrib><collection>Ecology Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Biotropica</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hicks, David J.</au><au>Mauchamp, Andre</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Population Structure and Growth Patterns of Opuntia echios Var. gigantea Along an Elevational Gradient in the Galapagos Islands</atitle><jtitle>Biotropica</jtitle><date>2000-06-01</date><risdate>2000</risdate><volume>32</volume><issue>2</issue><spage>235</spage><epage>243</epage><pages>235-243</pages><issn>0006-3606</issn><eissn>1744-7429</eissn><abstract>Cacti growing in forests potentially experience growth limitation due to reduced light availability. To test this hypothesis, we studied the population structure of Opuntia echios var. gigantea at 15 sites on the south side of Isla Santa Cruz, Galapagos Islands, Ecuador. Populations were located in communities ranging from arid scrub at low elevations to closed-canopy tropical dry forest at higher elevations. Ordination confirmed the existence of a strong elevation-vegetation gradient. Opuntia abundance peaked at lower elevations (<ca 30 m), with lower densities in closed-canopy sites. For populations in scrub vegetation, density declined fairly regularly with plant height. Populations in forested sites had few plants of intermediate height, suggesting periodic recruitment. Scrub populations had random dispersion, while those in forests were aggregated. The change in spatial pattern may be related to a change in primary reproductive mode from asexual propagation via fallen fruits to propagation via fallen cladodes. Height was significantly correlated with stem diameter. Intercepts of these relationships increased toward higher elevations, probably in response to the increasing height of the surrounding canopy.</abstract><pub>Association for Tropical Biology</pub><doi>10.1043/0006-3606(2000)032(0235:PSAGPO)2.0.CO;2</doi><tpages>9</tpages></addata></record> |
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| source | BioOne Complete; Access via Wiley Online Library; JSTOR Archive Collection A-Z Listing |
| subjects | Arid zones Cactus Cladodes Dry forests Ecuador, Galapagos Is Forest canopy Forest growth Opuntia echios gigantea Plant growth Plants Topographical elevation Vegetation |
| title | Population Structure and Growth Patterns of Opuntia echios Var. gigantea Along an Elevational Gradient in the Galapagos Islands |
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