August 5th, 2015 – Wetland Survey and Preliminary Data Collection-Team Dryad’s Saddle

August 5th, 2015 – Wetland Survey and Preliminary Data Collection-Team Dryad’s Saddle

Blog Entry Written by Team: Team Dryad’s Saddle (Polyporous squamosus)

Team Members: Derek Newton (Queen’s), Lanxue Qin (Tongji), Kangnan Xing (BNU), Wenyang Lyu (D’overbroecks)

Weather:  Partly Cloudy, Sunny in morning with some light showers in the mid-afternoon         18-23°C

We began the morning with a briefing in the basement lecture hall at QUBS. Professor Wang, Professor Lougheed, as well as all the other students gave us feedback on our plans for our wetland survey and assessment. The class discussed and critiqued all of the groups plans, and we then drove out to survey out wetland. We had been give Beaver Marsh, that had a small pool of water, surrounded by vast heterogeneous grasses and sedges. We learned that there was a small meandering creek that ran through our wetland, the remnant of a once large shallow marsh that was created when beavers built a dam to block the creeks flow. When we arrived the beavers had long departed, and the dam was in ruin. The water was flowing, unhindered, and although the ground was moist and muddy, much of the water had dried up. The shallow creek remained a refuge for a variety of amphibians, small fish, snails, and dense macrophytes.  We saw multiple leopard and green frogs leaping, as well many colourful dragonflies fly through the air. With the help of Wenxi, we build a bridge to cross the broken beaver dam to make our surveying in the afternoon easier (true ecosystem engineers!!).

While driving back to lunch at QUBS, along the side of the road we saw two deer and a fawn. That was not the only family out, as four large turkeys blocked our path. They did, however, have one additional member. A duck had decided that he would join them, and the turkeys seemed fine to have him tag along. We also made a stop to talk to some fishermen who said they were fishing for bass along Telephone Bay.

After lunch, we headed back to Beaver Marsh, travelling past the graveyard by Opinicon road and through the open pasture home the various QUBS research bird houses, and through a heavily wooded path. As we arrive on the Canadian Shield Bedrock outcropping on the edge of our marsh we decide to survey the edges of the pond for freshwater snail abundance, as well as clusters of Typha to measure their density. We then walked back through the heterogeneous landscape once again, before being driven back to QUBS for dinner.

During the evening, we had the pleasure to listen to a lecture presented by Julia Colm of Queen’s University and hear about her work on grass pickerel (Esox americanus vermiculatus) and their ecology. Although abundant in the U.S., east of the Appalachians, the grass pickerel is declining in Ontario, even though very tolerant to both warm (22-23 °C), hypoxic, and heavily polluted waters, it has paradoxically declined in numbers in south-eastern Ontario. They are very lethargic and slow moving, and like lots of vegetation coverage.  An ideal wetland species, but yet still not present in expected frequencies in rivers. Julia Colm present the hypothesis, that in contrast to historical data around Jones Creek in 1960, the decline observed recently (2014) may have been due to increased beaver activity, preventing migration of fish to ideal spawning sites, in combination with severe and more frequent droughts.

[2015年8月5日]-湿地调查与数据初步采集(树神之鞍小队)

早晨我们在QUBS基地报告厅做了个简要的报告,开启了新的一天。王教授与Louheed教授以及其他的同学们对我们组的湿地调查计划给出了一些建议。整个班级一起对所有组的湿地调查计划进行了探讨并给出自己的见解。我们通过抽签决定每个组要调查的湿地,我们组得到的是“河狸湿地”,这里有一个小池塘,被大片各类莎草所包围;还有一条蜿蜒曲折的小溪贯穿其中。多年以前河狸在这里建坝阻隔溪流,所以这里曾经水体丰富,而当我们达到这块湿地的时候,水坝已毁,河狸也不在了,曾经的大面积水域下载只剩下潮湿的泥土。但尽管如此,小溪还是无碍地流淌着。这条溪流为许多两栖类动物,小鱼,蜗牛提供了良好的栖息地,并滋养着密集的植被。各种青蛙在地面上跳着,各种颜色的蜻蜓在空中飞着。在文熙的帮助下,我们在破败的水坝上用木头搭了个小桥,以便下午继续对这片湿地进行调查(我们也是生态工程师啦:D)。

在回QUBS吃午餐的路上,我们看到了两只鹿带着它们的孩子站在路边,但出来散步的可不止这一家,有四只火鸡在过马路时挡在了我们的前面,一只鸭子想要加入它们的队伍,火鸡们似乎也接受了它。这真是生动有趣的一幕啊!

吃过午饭,在经过了奥匹尼根路旁一片开阔的墓地后,我们从女王大学的观鸟瞭望科学研究观察站旁经过,然后穿过了一片落叶缤纷的树林后,我们回到了河狸湿地。我们在裸露的加拿大地盾的岩石的表面上决定了我们的调查方向:沿着河岸线随机抽取样本并调查淡水及蜗牛的数量及香蒲丛的密度。在测完了我们需要的数据后,我们暂时地离开了我们的湿地。为此,我们再次穿过了复杂大密度复杂的树林并在身上留下了一些清晰的划痕。

天黑之前,我们有幸听到了来自女王大学的本科生茱莉亚柯乐木的演讲并了解了“梭草鱼”的课程和她的工作重点。尽管这种物种在美国,东阿拉巴起亚很丰富,但在安大略省几乎灭绝。安大略省的环境很适宜而且很恒定(22度到23度),没有污染且含氧量丰富,但在安大略省东南部,这个物种的种群数量下降得很快。它们几乎不怎么游动,昏昏欲睡,喜欢待在茂密的植被下面。虽然这个物种理论上应当广泛存在于湿地中,但实际上它们在河流中的种群密度并不如预期中的高。茱莉亚柯乐木将数据与1960年琼斯的历史数据进行比较后做出了推测:在2014最近的观察到种群数量下降可能是由于增加的河狸种群活动有关,是他们朱德巴阻止了鱼群回油到出生地进行产卵,严峻的干旱条件也是鱼群数量下降的罪魁祸首之一。

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s