Dynamics of a landscape mosaic: size and age distributions, growth and demography of seagrass Cymodocea nodosa patches

被引:70
作者
Vidondo, B
Duarte, CM
Middelboe, AL
Stefansen, K
Lutzen, T
Nielsen, SL
机构
[1] CSIC, CTR ESTUDIOS AVANZADOS BLANES, E-17300 BLANES, GIRONA, SPAIN
[2] ROSKILDE UNIV CTR, DEPT LIFE SCI & CHEM, DK-4000 ROSKILDE, DENMARK
关键词
seagrass patch dynamics; landscape scale; three-dimensional mapping; size and age distributions; Pareto distribution;
D O I
10.3354/meps158131
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The patch dynamics (recruitment, growth and mortality) of seagrass Cymodocea nodosa were examined at the landscape scale (i.e. the scale at which disturbances occur) by means of 3-dimensional (X, Y dimensions and depth) mapping of shoot internal density and age structure within the basic units (patches) forming the landscape. Highly skewed patch size and age distributions indicated a high exponential patch mortality rate (m = 0.82 +/- 0.07 yr(-1)) and a slightly higher exponential patch recruitment rate (1.04 yr(-1)) that ensures the maintenance and fast turnover of this population of patches. Patch growth (i.e. increase in number of shoots per patch) proceeded at an exponential growth rate of 2.28 +/- 0.14 yr(-1), indicating a doubling time of 111 d for the shoot population within each patch. Moreover, average patch growth rate accelerates with increasing patch size and age. This self-acceleration of patch growth means that this seagrass species has a remarkable potential for rapid space occupation due to its intense clonal growth. The results obtained emphasize the power of a landscape approach for describing the intense dynamics of colonising seagrass populations.
引用
收藏
页码:131 / 138
页数:8
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