当前位置: X-MOL 学术N. Am. J. Fish. Manag. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Factors Influencing Capture and Retention of Razorback Sucker in Light Traps
North American Journal of Fisheries Management ( IF 1.1 ) Pub Date : 2020-07-15 , DOI: 10.1002/nafm.10491
Catherine M. Vlaming 1 , Kevin R. Bestgen 1
Affiliation  

Light trap captures of larval, endangered Razorback Sucker Xyrauchen texanus are used to guide flow release timing from reservoirs and measure Razorback Sucker annual reproductive success in the Green River, Utah. However, little is known regarding efficacy of light traps to capture or retain larvae under variable and field‐relevant environmental conditions. We conducted laboratory experiments to investigate the effects of light trap set time, fish release distance from trap, light presence, turbidity, fish density, and cover on capture and retention probabilities of five early life stages of Razorback Sucker. Mean capture probability of protolarvae prior to swim bladder development (7–9 mm TL) was 0.40 (range = 0.28–0.55) over various treatments but rose to 0.76 (0.73–0.80) after swim bladder development in later protolarvae (9–10 mm TL). Mesolarvae (11–17 mm TL), the most common life stage captured in field sampling, had a similar mean capture probability (0.86; 0.82–0.90) as later protolarvae. Capture probabilities of metalarval (mean = 0.42, range = 0.21–0.63; 15–24 mm TL) and juvenile (mean = 0.24, range = 0.20–0.28; 22–37 mm TL) life stages were lower. Larvae retention probabilities were generally > 0.75 and increased to 0.97 for juveniles. Longer set times positively influenced capture probabilities, though capture probabilities were similar in 1‐, 3‐, and 5‐m release distances and relatively high (>0.75) for most the commonly sampled life stages in standard conditions. Light presence in traps greatly increased capture and retention of larvae compared with unlit traps. Our results confirm that light traps may be useful to detect first presence of Razorback Sucker larvae in Green River backwaters each spring, which triggers Flaming Gorge Reservoir releases to inundate floodplain wetlands and for annual monitoring of reproductive success. We also provide recommendations for gear set up, deployment, and techniques to increase capture and retention probabilities of Razorback Sucker larvae.

中文翻译:

影响诱捕器中剃刀背吸盘的捕获和保留的因素

捕光幼虫,濒临灭绝的Razorback Sucker Xyrauchen texanus的光陷阱  用于指导从水库中释放水流的时间并评估Razorback Sucker在犹他州格林河的年度繁殖成功率。但是,对于在可变的和与田地有关的环境条件下,捕光器捕获或保留幼虫的功效知之甚少。我们进行了实验室实验,以研究捕蝇器设置时间,鱼从捕捞器中释放的距离,光照的存在,浊度,鱼的密度以及覆盖率对剃刀背吸盘五个生命早期阶段的捕获和保留概率的影响。在各种处理中,在泳囊发育之前(7–9 mm TL)原虫的平均捕获概率为0.40(范围= 0.28–0.55),但在后来的原虫发育(9–10 mm)中,在膀胱发育后的平均捕获概率上升至0.76(0.73–0.80)。 TL)。Mesolarvae(11–17 mm TL),是现场采样中最常见的生命阶段,平均捕获概率(0.86; 0.82-0.90)与后期的幼虫相似。金属生命(平均= 0.42,范围= 0.21-0.63; 15-24 mm TL)和青少年(平均= 0.24,范围= 0.20-0.28; 22-37 mm TL)的捕获概率较低。幼虫的保留概率通常> 0.75,而幼虫则增加到0.97。更长的设置时间对捕获概率有积极影响,尽管捕获概率在1-3、3和5m的释放距离中相似,并且在大多数标准条件下通常采样的生命阶段中相对较高(> 0.75)。与未点燃的诱捕器相比,诱捕器中的光存在极大地提高了幼虫的捕获和保留。我们的结果证实,每年春天在绿河回水中使用诱捕器可能有助于检测Razorback Sucker幼虫的首次存在,这触发了火焰状峡谷水库的释放,淹没了泛滥的平原湿地,并每年进行繁殖成功监测。我们还提供有关齿轮设置,部署和技术的建议,以增加Razorback Sucker幼虫的捕获和保留概率。
更新日期:2020-07-15
down
wechat
bug