Molecular helminthology in the Rockies

A report on the Keystone Symposium on Molecular Helminthology, Copper Mountain, Colorado, USA, 9-13 April 2005

Food web topology and nested keystone species complexes

Important species may be in critically central network positions in ecological interaction networks. Beyond quantifying which one is the most central species in a food web, a multi-node approach can identify the key sets of the most central n species as well. However, for sets of different size n, these structural keystone species complexes may differ in their composition. If larger sets contain smaller sets, higher nestedness may be a proxy for predictive ecology and efficient management of ecosystems. On the contrary, lower nestedness makes the identification of keystones more complicated. Our question here is how the topology of a network can influence nestedness as an architectural constraint. Here, we study the role of keystone species complexes in 27 real food webs and quantify their nestedness. After quantifying their topology properties, we determine their keystones species complexes, calculate their nestedness and statistically analyze the relationship between topological indices and nestedness. A better understanding of the cores of ecosystems is crucial for efficient conservation efforts and to know which networks will have more nested keystone species complexes would be a great help for prioritizing species that could preserve the ecosystem’s structural integrity

Keystone XL Pipeline Project: Key Issues

[Excerpt] This report describes the Keystone XL pipeline proposal and the process required for federal approval. It summarizes key arguments for and against the pipeline put forth by the pipeline’s developers, federal agencies, environmental groups, and other stakeholders. Finally, the report reviews the constitutional basis for the State Department’s authority to issue a Presidential Permit, and opponents’ possible challenges to this authority

Keystone XL Pipeline: Overview and Recent Developments

[Excerpt] This report describes the Keystone XL Pipeline Project and the process that the State Department must complete to decide whether it will approve or deny TransCanada’s permit application. The report also discusses key energy security, economic, and environmental issues relevant to the State Department’s national interest determination. Some of these issues include perspectives among various stakeholders both in favor of and opposed to the construction of the pipeline. Finally, the report discusses the constitutional basis for the State Department’s authority to issue a Presidential Permit, and opponents’ possible challenges to this authority

Issuance of the Keystone XL Permit: Presidential Prerogative or Presidential “Chutzpah”

This article uses President Trump\u27s issuance of the Keystone XL Pipeline permit to illustrate the dangers of an imperial presidency, one in which the exercise of discretionary authority, based on neither the text of Article II of the Constitution nor a statute, will in all likelihood be unchecked by Congress, the courts, or popular opinion. To understand the dimensions of this concern, Part I of this article briefly describes the process and requirements for a presidential permit. Part II identifies key facts surrounding issuance of the Keystone XL Pipeline permit, the chronology of its issuance, and commonly given reasons supporting or opposing the permit. Part II includes a discussion of non-legal arguments favoring permit issuance, such as its projected economic and national security benefits and the promotion of beneficial relations with a border country, as well as those against its issuance, such as its projected environmental harm and the dangerous precedent it may set as a way to avoid environmental accountability for presidential activities that may have a significant adverse effect on the environment. Part III looks more closely at the constitutional arguments justifying the permit\u27s issuance, finding potential support in the President\u27s prerogative powers as well as in his constitutionally assigned role as Commanderin-Chief of the Army and Navy, his duty to oversee foreign relations, and to take care that the laws are faithfully executed. Part IV identifies the extent to which Article II cabins the President\u27s authority to issue the Keystone XL Pipeline permit and how its issuance may violate the separation of powers doctrine. The arguments that the courts, Congress, and the public will check any abuse of power by the President and that this use of presidential power is supported by precedent are set out in Part III and then critiqued in Part IV. The last part of the article, Part V, broadens the perspective on the issuance of the Keystone XL Pipeline permit. More specifically, the Part discusses how its issuance reflects an accretion of presidential power and questions the wisdom of potentially unbalancing the balance of powers between the two branches of government in the current political environment. Much of the Part\u27s discussion centers on then--Professor Elena Kagan\u27s strong support for a dominant president, what she calls a “presidential administration,” and those who disagree with that idea. The article concludes the President may have stepped beyond the limits of his Article II enumerated and discretionary constitutional powers by issuing the Keystone XL Pipeline permit. In treading on Congress\u27 constitutional authority, President Trump\u27s action risks the creation of an uncheck-able imperial presidency, beyond even what Justice Kagan envisioned. This type of presidency may do serious permanent damage to the constitutional structure of our government, outlasting, in the specific situation, President Trump\u27s days in office