| ชื่อเรื่อง | : | Switching from negative to positive density-dependence among populations of a cobble beach plant |
| นักวิจัย | : | Goldenheim, William M. , Irving, Andrew D. , Bertness, Mark D. |
| คำค้น | : | LIBRARY OF CONGRESS NEEDED , Pure basic research. , 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments. , 960802 Coastal and Estuarine Flora, Fauna and Biodiversity. , . , 050205 Environmental Management. , 050102 Ecosystem Function. , . , Facilitation -- \a , Physical Stress -- \a , Spartina Alterniflora -- \a , Stress Gradient Hypothesis -- \a , Suaeda Linearis -- \a , Journal Article |
| หน่วยงาน | : | Central Queensland University, Australia |
| ผู้ร่วมงาน | : | - |
| ปีพิมพ์ | : | 2551 |
| อ้างอิง | : | http://hdl.cqu.edu.au/10018/1024955 |
| ที่มา | : | Goldenheim, WM, Irving, AD & Bertness, MD 2008, 'Switching from negative to positive density-dependence among populations of a cobble beach plant', Oecologia, vol. 158, no. 3, pp. 473-483, http://dx.doi.org/10.1007/s00442-008-1157-0 |
| ความเชี่ยวชาญ | : | - |
| ความสัมพันธ์ | : | Oecologia. Germany : Springer, 2008. 158, no. 3473-483 11 pages Refereed 0029-8549 1432-1939 (online) , ACQUIRE [electronic resource] : Central Queensland University Institutional Repository |
| ขอบเขตของเนื้อหา | : | - |
| บทคัดย่อ/คำอธิบาย | : | Interactions among species occur across a continuumfrom negative to positive and can have a criticalrole in shaping population and community dynamics.Growing evidence suggests that inter- and intra-speciWcinteractions can vary in strength or even switch direction(i.e., negative to positive) depending on environmental conditions,consumer pressure, and also among life-historystages. We tested the hypothesis that seedlings and adultsof the intertidal annual forb Suaeda linearis growing onNew England shores exhibit positive density-dependenceunder physically stressful conditions high on the shore (i.e.,greater temperatures, evaporative stress), but negative density-dependence under physically milder conditions low onthe shore. Among experimental treatments of plant density(dense versus sparse) at each shore height, plant biomass,length, and number of leaves/branches were greater indense stands high on the shore (positive density-dependence),but greater in sparse stands low on the shore (negativedensity-dependence). Such responses were consistentamong life-history stages and generally consistent betweensites. As a more direct measure of Wtness, per capita seedproduction was also positively density-dependent high onthe shore, but negatively density-dependent low on theshore. These results support the current theory predicting anincrease in the frequency of positive interactions withincreasing environmental stress and further emphasize thepreviously understated role of positive interactions in shapingand maintaining populations and communities. |
| บรรณานุกรม | : |
Goldenheim, William M. , Irving, Andrew D. , Bertness, Mark D. . (2551). Switching from negative to positive density-dependence among populations of a cobble beach plant.
กรุงเทพมหานคร : Central Queensland University, Australia. Goldenheim, William M. , Irving, Andrew D. , Bertness, Mark D. . 2551. "Switching from negative to positive density-dependence among populations of a cobble beach plant".
กรุงเทพมหานคร : Central Queensland University, Australia. Goldenheim, William M. , Irving, Andrew D. , Bertness, Mark D. . "Switching from negative to positive density-dependence among populations of a cobble beach plant."
กรุงเทพมหานคร : Central Queensland University, Australia, 2551. Print. Goldenheim, William M. , Irving, Andrew D. , Bertness, Mark D. . Switching from negative to positive density-dependence among populations of a cobble beach plant. กรุงเทพมหานคร : Central Queensland University, Australia; 2551.
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