Trophic Cascades in Salt Marsh Ecosystems

Salt wetlands were once thought to be an example of bottom-up regulation. There, ecosystems are determined by abiotic factors and the availability of nutrients. Ecologist Dr. Brian Siriman stated that salty wetlands are often covered with snails - what do they eat? Through a series of cage experiments, Dr. Silliman demonstrated that snails control the amount of wetland grass by promoting fungal infection. He also showed that blue crabs control the number of snails, thus protecting wetland grass from overgrazing. This is a good example of long-standing theories and data that can be used to improve and improve our understanding of nature.

Salt wetlands live in the world's low-energy intertidal coastline, one of the most abundant and productive coastal ecosystems. Salt swamp ecosystems bring various benefits to coastal people such as coastline protection, fishery support, water quality improvement, wildlife habitat supply, and carbon sequestration. Historically, the main threat to salt wetlands was to bridge the agricultural sector and urban construction. This tendency continues to evolve as the coastline develops. Considering the value and loss of salty wetlands, wetland management and conservation policies in many countries in recent years have resulted in the conservation and recovery of salt wetlands; however, the global salty wetlands and conditions have declined continue. Currently, the main threats to salty wetland resources include the impact of climate change, pollution, changes in land use, and invasive species.

Salt wetlands are very valuable and productive ecosystems, but they are also vulnerable. They are usually located in areas where agriculture, shipping, industry, urban development are ideal. So far, the biggest threat to salt wetlands is to fill them up for buildings related to these activities. In many cases, this process begins with drought and drainage of salt wetlands. Since 1800, 70% of salt wetlands in the Canadian Pacific has been drained or lost other functions. Other threats to salty wetlands include the following: