2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/27/2021 | 2:00 PM - 3:30 PM | DYNAMIC OCCUPANCY MODELING OF AN INVASIVE MACROPHYTE, HYDRILLA VERTICILLATA, IN RIVERINE ROCK POOLS | Virtual Platform

DYNAMIC OCCUPANCY MODELING OF AN INVASIVE MACROPHYTE, HYDRILLA VERTICILLATA, IN RIVERINE ROCK POOLS

Invasive species pose a threat to ecosystems by outcompeting native species and/or modifying habitats. Understanding what drives invasion has been a central question for invasion biology for decades. Hydrilla verticillata is an invasive macrophyte throughout the United States, dominating lakes and streams, negatively impacting local economies. We studied drivers of Hydrilla invasion and persistence in riverine rock pools. Leveraging a four-year data set collected from hundreds (N=745) of independent rock pools, we dynamically modeled occupancy, colonization, and extinction probabilities of Hydrilla using the “unmarked” package in R. Occupancy was greater in more voluminous pools with higher flood levels. Colonization was greater in pools with higher flood levels and increased across years; while lower in pools further away from Hydrilla pools. Extinction was greater further away from Hydrilla pools and decreased across years; while lower in more voluminous pools that were further away from the river channel and flooded at higher levels. Pool morphology, temporal, and spatial factors heavily influenced Hydrilla in the rock pool system. It is important to understand the drivers of invasion to predict the spread of invasive species in lakes and streams to better inform management strategies.

Models
Monitoring
Stream

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Presenters/Authors

Joshua Armstrong (), Virginia Commonwealth University, j.armstrong9280@gmail.com;