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首页> 外文期刊>San Francisco Estuary and Watershed Science >Individual-level and Population-level Historical Prey Demand of San Francisco Estuary Striped Bass Using a Bioenergetics Model
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Individual-level and Population-level Historical Prey Demand of San Francisco Estuary Striped Bass Using a Bioenergetics Model

机译：使用生物能学模型的旧金山河口条纹鲈个体水平和人口水平的历史猎物需求

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Striped bass are both a major predator of native fishes and support a recreational fishery in the San Francisco Estuary (the estuary). Quantifying their demands on their prey is important for understanding long-term trends of fish in the estuary. In this study, we: (i) applied a bioenergetics model of sub-adult (age 1 and age 2) and adult (age 3+) striped bass (Morone saxatilis) to quantify long-term consumption patterns from 1969 through 2004 in the estuary; (ii) developed a method to estimate the abundances of sub-adult striped bass; (iii) evaluated how consumption varied by age and gender; and (iv) identified factors that affect the resulting consumption estimates. On a ‘per capita’ basis, modeled individual prey fish consumption increased after 1990, and individual total and prey fish consumption by age-2 striped bass increased after 1994. Conversely, individual total and prey fish consumption by adult striped bass decreased over the period analyzed. This decline in individual consumption over the study period was related to a decline in mean length at age of adults. As expected, long-term trends in population consumption (total and prey fish) by all ages of striped bass (ages 1 through 6) closely followed their respective population- abundance trends. Population total consumption and prey fish-specific consumption by sub-adult striped bass was found to be similar to the population consumption by adult striped bass, largely because of the high abundance of sub-adults. Unlike adult striped bass that may emigrate and forage in the Pacific Ocean, the majority of sub-adult striped bass reside within the estuary; hence, consumption by the relatively abundant sub-adult population may have significant effects upon their estuarine prey species.
机译：条纹鲈鱼既是本地鱼类的主要捕食者，又支持旧金山河口（河口）的休闲渔业。量化他们对猎物的需求对于了解河口鱼类的长期趋势很重要。在这项研究中，我们：（i）应用了亚成人（1岁和2岁）和成人（3岁以上）条纹鲈（Morone saxatilis）的生物能学模型来量化1969年至2004年的长期消费模式。河口; （ii）开发了一种方法来估计亚成人条纹鲈的丰度; （iii）评估了消费如何随年龄和性别变化; （iv）确定影响最终消费估算的因素。在“人均”基础上，1990年以后，模型化的个体fish鱼消费量增加，而1994年以后，按2岁条纹鲈鱼的个体总和猎物鱼的消费量增加。相反，在此期间，成年条纹鲈鱼的个人总和猎物鱼的消费量减少了。分析。在研究期间，个人消费的下降与成人年龄平均长度的下降有关。不出所料，各个年龄段的鲈鱼（1至6岁）的种群消费（总和猎物）的长期趋势紧随其各自的种群数量趋势。发现亚成年鲈鱼的种群总消费量和捕食鱼类的消费量与成年鲈鱼的种群消费量相似，这主要是由于亚成虫的丰富度很高。与可能在太平洋移民和觅食的成年鲈鱼不同，大多数亚成年鲈鱼生活在河口内。因此，相对丰富的亚成年人口的食用可能对其河口猎物种类产生重大影响。

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