What Is The Food Chain For Lake Tahoe Including Non Aquatic Animals
journal article
Ecosystems
, pp. 274-288 (15 pages)
Published Past: Springer
https://www. jstor .org/stable/3658893
Plans for the restoration of aquatic ecosystems are increasingly focusing on the restoration and rehabilitation of self-sustaining native fish communities. Such efforts have non traditionally adopted an ecosystem-based perspective, which considers species as embedded within a broader food web context. In this study, we quantify nutrient spider web changes in Lake Tahoe (California-Nevada) over the terminal century based on stable isotope analysis of museum-archived, preserved fish specimens collected during 4 historical periods and under present conditions. Nosotros also examine the gimmicky food web of nearby Pour Lake, which is free from nearly exotic species and contains a species assemblage resembling that of Lake Tahoe prior to historical species introductions. During the last century, the freshwater shrimp Mysis relicta and lake trout (Salvelinus namaycush) have been introduced and established in Lake Tahoe, and the native peak predator, Lahontan cutthroat trout (Oncorhynchus clarki henshawi; hereafter LCT), has been extirpated. Isotope analysis indicates that lake trout at present occupy a trophic niche like to that of historical LCT. Fish production has shifted from benthic to pelagic, corresponding with the eutrophication of Lake Tahoe during recent decades. The current Cascade Lake nutrient web resembles that of the historical Lake Tahoe nutrient web. Our isotope-based nutrient spider web reconstructions reveal long-term nutrient web changes in Lake Tahoe and tin serve as the basis for setting historically relevant restoration targets. Unfortunately, the presence of nonnative species, peculiarly Mysis and lake trout, have dramatically altered the pelagic nutrient web structure; as such, they are barriers to native fish community restoration. Fish community restoration efforts should focus on adjacent ecosystems, such as Cascade Lake, which have a high likelihood of success because they take not been heavily affected by nonnative introductions.
The written report and direction of ecosystems represent the most dynamic field of contemporary ecology. Ecosystem inquiry bridges central ecology and environmental ecology and ecology problem-solving, and spans boundaries of scale, discipline and perspective. Ecosystems features a distinguished team of editors-in-primary and an outstanding international editorial board, and is seen worldwide every bit a vital home for publishing significant inquiry as well as editorials, mini-reviews and special features.
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Source: https://www.jstor.org/stable/3658893
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