大梭鱼管理:五十年的合作垂钓者,科学家和渔业生物学家BOB国际体育

水位和衬底斜率的影响可用性的合适的栖息地Age-0大梭鱼的乔治亚湾(抽象)

帕特丽夏Chow-Fraser和丹·韦勒

doi:https://doi.org/10.47886/9781934874462.ch26

乔治亚湾支持自我维持的大梭鱼该河masquinongy渔业,但招聘失败被怀疑在乔治亚湾东南部(SEGB)程序。在历史性的幼儿园网站缺乏age-0大梭鱼SEGB归因于持续的低水位夏天;然而,存在age-0乔治亚湾北部的鱼(NGB)湿地的相对重要性在低水位年怀疑水位大梭鱼招聘。相反,age-0鱼类的栖息地可能依赖水位和近岸水域的深度测量法;之间的差异的存在age-0鱼SEGB NGB在低水位年可能是由于网站地貌的差异。数字高程模型是用来计算斜率和核心托儿所区域(CNA;离海岸地区为20 m等高线)历史性的幼儿园网站SEGB和17在NGB幼儿园网站确认使用1981(高)和2012(低)水位条件。NGB网站的平均斜率明显高于在高水位(8.35°和6.78°)。相比之下,意味着斜率SEGB网站之间类似的高(0.94°)和低水位(0.73°)。意味着CNA明显高于在NGB低水位(0.11公顷和0.15公顷)和SEGB(1.7公顷和2.5公顷)。 Between 1981 and 2012, the shoreline migrated lakeward 20 m in SEGB versus only 10 m in NGB while the 1-m-depth contour migrated 50 m in SEGB versus 22 m in NGB. Both regions experienced similar water levels, so steeper nearshore slopes appear to mitigate effects of water-level fluctuations. Absence of age-0 fish during the 2012 survey in SEGB was likely due to the interaction between sustained low water levels and shallow slopes exposed by the low water levels that negatively affected the suitability of age-0 Muskellunge habitat.