Sea urchin grazing rates can strongly impact kelp bed persistence. Elevated water temperature associated with climate change may increase grazing rates; however, these effects may interact with local stressors such as sedimentation, which may inhibit grazing. In Alaska, glacial melt is increasing with climate change, resulting in higher sedimentation rates, which are often associated with lower grazer abundance and shifts in macroalgal species composition. The short-term effects of elevated temperature and sediment on grazing were investigated for the green sea urchin, Strongylocentrotus droebachiensis (O.F. Müller, 1776), in Kachemak Bay, Alaska (59° 37′ 45.00″ N, 151° 36′ 38.40″ W) in early May 2017. Feeding assays were conducted at ambient temperature (6.9–9.8 °C) and at 13.8–14.6 °C with no sediment and under a high sediment load. Grazing rates significantly decreased in the presence of sediment, but were not significantly affected by temperature. Along with sediment impacts on settlement and post-settlement survival, grazing inhibition may contribute to the commonly observed pattern of decreased macroinvertebrate grazer abundance in areas of high sedimentation and increased sedimentation in the future may alter sea urchin grazing in kelp forests.

中文翻译：

---

高温和泥沙淤积对绿海胆放牧率的影响：对因气候变化而增加泥沙淤积的海带森林的影响

海胆放牧率会严重影响海带床的持久性。与气候变化有关的水温升高可能会提高放牧率；但是，这些影响可能会与局部压力（例如沉淀）相互作用，从而抑制放牧。在阿拉斯加，冰川融化随着气候变化而增加，导致更高的沉积速率，这通常与较低的放牧者丰度和大型藻类组成的变化有关。研究了阿拉斯加Kachemak湾的绿海顽童Strongylocentrotus droebachiensis（OFMüller，1776）（59°37′45.00″ N，151°36′38.40″ W）的高温和沉积物对放牧的短期影响）于2017年5月上旬。在环境温度（6.9–9.8°C）和13.8–14.6°C且无沉积物和高沉积物负荷的条件下进行喂养试验。在有沉积物的情况下，放牧率显着降低，但不受温度影响。除沉积物对定居和定居后生存的影响外，放牧抑制可能导致通常观察到的高沉积地区大型无脊椎动物放牧者丰度下降的模式，而未来的沉积增加可能会改变海带森林中海胆的放牧。