1 / 26

Assessing the Impact of Long-term Seasonal Flow Patterns on Fish Species in Backwaters

This study aims to establish baselines for long-term monitoring of fish species in backwater habitats influenced by seasonal low-flow scenarios (LSSF). Key objectives include identifying distribution patterns, estimating relative abundances, evaluating growth rates of young-of-year (YOY) native and small non-native fishes, and understanding the anticipated effects of LSSF on temperature and habitat stability. The findings indicate increased spawning for native fishes and variable responses in non-native species, highlighting the importance of continued monitoring over the next several years to assess long-term impacts.

hedda
Télécharger la présentation

Assessing the Impact of Long-term Seasonal Flow Patterns on Fish Species in Backwaters

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GOALS and OBJECTIVES • BASELINE FOR LONG TERM MONITORING • Identify distribution and estimate relative abundances of fish species • (Other objectives - no time to discuss) • EVALUATE LSSF • Identify growth patterns for YOY native fishes and small non-native fishes in backwaters during LSSF • Evaluate changes in relative abundance

  2. ANTICIPATED EFFECTS OF LSSF • MAIN CHANNEL TEMPERATURE INCREASES • NEAR SHORE TEMPERATURE INCREASES • INCREASED STABILITY AND TEMPERATURE OF SHORELINE HABITATS (Backwaters) • ENHANCED SPAWNING FOR NATIVE FISHES • INCREASED GROWTH AND SURVIVAL FOR NATIVE FISHES • INCREASED GROWTH, SURVIVAL AND EXPANDED DISTRIBUTION OF WARM WATER NON-NATIVE FISHES

  3. LSSF : CONCLUSIONS • MAIN CHANNEL AND BACKWATER TEMPERATURES INCREASED • NO IMMEDIATE INCREASE OR CHANGE IN DISTRIBUTION OF ADULT NATIVES OR NON-NATIVES • NO OBSERVABLE POSITIVE EFFECT ON GROWTH OF YOY FISH • ENHANCED SPAWNING FOR NATIVE FISHES • ENHANCED SPAWNING FOR FATHEAD MINNOW • SIGNIFICANT INCREASE IN ABUNDANCE OF FMS, BHS, SPD, AND FHM (NOT HBC) • FALL SPIKE; DISADVANTAGED FHM MORE THAN NATIVES • INCREASED SURVIVAL ??

  4. LSSF: BOTTOM LINE • BENEFIT TO HBC MINIMAL • BENEFIT TO NATIVE SUCKERS ONLY IF YEAR CLASS SUCCESSFULLY RECRUITS - WON’T KNOW FOR 3-4 YEARS • BENEFIT TO NON-NATIVES (FHM) • WAS IT STEADY FLOWS OR TEMPERATURES, OR BOTH ? (SAME EFFECTS WITH WARMER TEMPS AND FLUCTUATING FLOWS?) • REPEATABLE?

More Related