THE INFLUENCE OF HABITAT COMPLEXITY ON POSTRECRUITMENT PROCESSES IN A TEMPERATE REEF FISH POPULATION
THE INFLUENCE OF HABITAT COMPLEXITY ON POSTRECRUITMENT PROCESSES IN A TEMPERATE REEF FISH POPULATION
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DOI：
10.1016/0022-0981(91)90129-k
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发表时间：
1991-01-01
影响因子：
2
通讯作者：
JONES, GP
中科院分区：
文献类型：
--
作者：
CONNELL, SD;JONES, GP
在新西兰东北部，成年的blennioid鱼Forsterygion varium Bloch等施耐德表现出极端的差异，低，中，高物理复杂性的栖息地之间的密度。年龄组成也不同的栖息地，复杂的网站支持更大比例的老鱼（> 1岁以上）。招募和postrecruitment过程中确定这些模式的相对重要性进行了评估，通过监测的丰度，生存，生长和运动的两个单独的队列的青少年在不同的复杂性的栖息地。人口统计数据的基础上记录的个人识别的鱼类监测从招聘的时间在永久样方。尽管在时间和空间上的高度变异的强度和分布之间的招聘年，成年F。变异高度依赖于早期招募后死亡率。早期少年死亡率较高的栖息地内经历了低复杂性。死亡率在构建空间格局中的最大影响发生在定居后的第一周内。季节性的迁徙高峰可能部分促成了生境之间分布模式的变化。生境对生长的影响不太清楚，虽然有一个趋势，生长更好的高地形复杂性的栖息地内。地形复杂性对幼鱼存活率的影响进行了研究，使用操作实验，增加了简单的栖息地的复杂性，降低了异质性栖息地的复杂性。在所有治疗中招募大致均匀。低复杂性治疗的死亡率为100%，而高复杂性治疗的死亡率仅为13%。自然种群的人口统计学和随后的实验表明，在丰富的成年F。不同生境之间的差异主要是由于幼鱼在低复杂性生境中无法大量生存。
In north-eastern New Zealand, adults of the blennioid fish Forsterygion varium Bloch et Schneider exhibited extreme differences in density among habitats of low, intermediate and high physical complexity. The age composition also differed among habitats, with complex sites supporting a greater proportion of older fish (> 1 + yr). The relative importance of recruitment and postrecruitment processes in determining these patterns was evaluated by monitoring the abundance, survival, growth and movement of two separate cohorts of juveniles in habitats of different complexity. The demographic data were based on records of individually recognised fish monitored from time of recruitment in permanent quadrats. Despite high temporal and spatial variability in the intensity and distribution of recruitment between years, adult F. varium were highly dependent on early postrecruitment mortality. Greater rates of early juvenile mortality were experienced within habitats of low complexity. The greatest impact of mortality in structuring spatial patterns occurred within the first week after settlement. Seasonal peaks in movement may have partially contributed to changes in patterns of distribution between habitats. The effects of habitat on growth were less clear, although there was a trend for growth to be better within habitats of high topographic complexity. The effect of topographic complexity on survivorship of juveniles was examined using a manipulative experiment which increased the complexity of simple habitats and reduced the complexity of heterogeneous habitats. Recruitment occurred roughly evenly across all treatments. Low complexity treatments suffered 100% mortality compared to only 13% in high complexity treatments. The demography of natural populations and the subsequent experiment suggest that differences in the abundance of adult F. varium between habitats can be attributed essentially to the early failure of juveniles to survive in large numbers in low complexity habitats.