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INHS Seminar - Incorporating Early Life History and Recruitment in Analysis of Population Dynamics of Wetland Fishes

Event Type
Seminar/Symposium
Sponsor
Illinois Natural History Survey Seminar Committee
Location
Virtual (Zoom)
Virtual
Date
Oct 20, 2020   4:00 pm  
Speaker
John Gatto, Postdoctoral Researcher, Great Rivers Field Station, Illinois Natural History Survey
Contact
Cathy Bialeschki
E-Mail
cathyb@illinois.edu
Views
123

Join Zoom Meeting: https://illinois.zoom.us/j/93282240583?pwd=T2NxYkdGNDJXbTM5L2VSWHZIRzZvQT09

Meeting ID: 932 8224 0583 | Password: INHS1858

Fish recruitment is linked to three important characteristics: age-specific growth (G’), mortality (M’), and dispersal.  However, hydrological variation is believed to be the major abiotic factor influencing recruitment in floodplain ecosystems.  I examined long-term recruitment dynamics for six fish species in the Everglades by addressing the impact of hydrology on dispersal, growth, and mortality.  Rapid colonization resulted in higher recruitment for strong dispersing species.   For poor dispersing species, the age/size when M’/G’=1 acted as an important indicator of recruitment success.  Results determined that hydrology not only alters movement but delays the onset of an important recruitment indicator (age/size when M’/G’=1).

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