Science Inventory

INTERACTIONS BETWEEN BYTHOTREPHES CEDERSTROEMI AND LEPTODORA KINDTII INFERRED FROM SEASONAL POPULATION ABUNDANCE PATTERNS IN LAKE MICHIGAMME, MICHIGAN, USA

Citation:

Jarnagin, S T. AND B. K. Swan. INTERACTIONS BETWEEN BYTHOTREPHES CEDERSTROEMI AND LEPTODORA KINDTII INFERRED FROM SEASONAL POPULATION ABUNDANCE PATTERNS IN LAKE MICHIGAMME, MICHIGAN, USA. Presented at American Society of Limnology and Oceanography (ASLO) 2001 Aquatic Sciences meeting, Albuquerque, NM, February 12-16, 2001.

Impact/Purpose:

Overarching Objectives and Links to Multi-year Planning

This research directly supports long-term goals established in ORD's multi-year research plans related to GPRA Goal 2 (Water Quality) and Long Term Goal WQ-2 Assessment of aquatic systems impairment. Relative to the GRPA Goal 2 Water Quality multi-year plan, this research will "provide tools to assess and diagnose impairment in aquatic systems and the sources of associated stressors" and "provide the tools to restore and protect aquatic ecosystems and to forecast the ecological, economic, and human health outcomes of alternative solutions" (Water Quality Long Term Research Goals 2 and 3).

Subtask 1 - Impervious Surface Evaluation

This subtask addresses the development of impervious surfaces estimators for local to regional scale assessments of watersheds and their landscape relationship to stream ecology. The amount of impervious surface area in a watershed is a key indicator of landscape change. As a single variable, it serves to integrate a number of concurrent interactions that directly influence a watershed's hydrology, stream chemical quality, and in-stream habitat. It is our working hypothesis that impervious surface area within a watershed, as an independently mapped predictor variable, can be used to generally track a range of watershed ecological parameters (e.g., NPS pollution, biological integrity, TMDLs) that are of concern to local, state and federal environmental managers. The specific objectives of this research are: 1) to quantitatively evaluate the varying remote sensing methods used in mapping impervious surfaces at multiple scales (local to regional), and 2) to relate the varying levels of impervious surface area in watersheds to the environmental condition of multiple water resource endpoints such as streamflow, temperature, and biota.



Subtask 2 -- Landscape Assessments and Evaluations of Best Management Practices: Watershed Demonstrations

Best Management Practices (BMP) encompass a range of strategies to reduce water pollution related to urban and agricultural activities. EPA, through Section 319(h) of the Clean Water Act [PL 92-500], provides grants to states to implement BMPs in areas with suspected or known water-quality problems. Grants for implementation of BMPs have not been tracked or monitored to document their effectiveness. Although effectiveness can be measured in many different ways, one straightforward but important measure is existence. Implementation of BMPs is a voluntary process and actual implementation is not always executed (Nowak 1992). The primary objective of this project is to assess the feasibility of using high-resolution aerial photography and other remotely sensed data to identify the existence of BMPs that were planned under the 319 program. An additional objective is to evaluate the effectives of BMPs implemented by examining monitoring data from about 5 sites in the OW National NPS monitoring system.

There are several potential benefits to determining the feasibility of using the aerial photography for identifying BMPs: 1) since BMP implementation is voluntary and some may not be implemented due to a variety of social and economic factors (Nowak 1992), remote detection of BMPs can provide data to estimate the ratio of BMPs implemented to BMPs planned; 2) remote detection of BMPs provides validation data that can be input into EPA's Grants Reporting and Tracking System (GRTS), and 3) remote monitoring of BMPs over time could be used to develop data on BMP lifespans, providing important data related to social- and cost-effectiveness.

Subtask 3 -- TMDL Non-point Source Assessment Tool

This subtask involves the development of a software tool to assess the potential risks of water bodies to exceed TMDL threshold values established by States. When completed, the tool will allow the user to evaluate watersheds over entire regions. The too

Description:


Bythotrephes cederstroemi is a non-indigenous predaceous zooplankter invading North American freshwater lakes in the Great Lakes region. We present seasonal population abundance values for both Bythotrephes and Leptodora kindtii from Lake Michigamme, Michigan for the years 1995-1997. We illustrate that Leptodora appears to be inhibited by Bythotrephes. Leptodora populations declined to near zero when Bythotrephes mean whole-depth abundance exceeded 3-5 animals per m3 and late season Leptodora populations consisted only of nauplii.

Our population data do not demonstrate the reason for the apparent inhibition of Leptodora by Bythotrephes. Bythotrephes may out-compete Leptodora for a shared food resource or may directly prey upon Leptodora. Our data emphasize the potential for the alteration of food webs due to the introduction of Bythotrephes into freshwater lake ecosystems. Both species rely on resting eggs to overwinter and reestablish populations. The elimination of early season Leptodora adult and juvenile instars and the failure of late season Leptodora nauplii to reach adulthood and produce resting eggs could result in the elimination of Leptodora from lakes where Bythotrephes has invaded.

Record Details:

Record Type:DOCUMENT( PRESENTATION/ ABSTRACT)
Product Published Date:02/12/2000
Record Last Revised:06/06/2005
Record ID: 60751