Patterns of zero and nonzero counts suggest spatiotemporal distributions, aggregation, and dispersion of invasive carp
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Abstract
Bigheaded carp Hypophthalmichthys spp. are invasive species native to Asia expanding in the Mississippi River Basin in North America. An understanding of spatiotemporal distribution and aggregation of invasive carp is key to establishing when and where to focus surveillance designed to monitor expansion, and to managing harvest programs designed to curb population densities. We applied a two-stage hurdle model to assess three aspects of bigheaded carp ecology: distribution, relative abundance, and aggregation. Stage 1 was a binary 0/1 model that represented fish presence (p), and stage 2 was a truncated count distribution that had no zeros and included counts ≥ 1 only (C). Estimates of p and C varied temporally and spatially, but not in harmony and sometimes in opposing directions, indicating temporal and spatial swings in fish distributions and aggregations. Intense fish aggregations in channels in spring shown by low p’s and high C’s, eventually scattered by summer and fall as shown by high p’s and low C’s. An alternative but complementary interpretation of our observations is that p indexes incidence of aggregations and C indexes size of aggregations. Partitioning catch into its zero and nonzero components provided insight into population ecology that can inform development of monitoring and management of harvesting programs targeted at lessening potential effects of the invasion.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Patterns of zero and nonzero counts suggest spatiotemporal distributions, aggregation, and dispersion of invasive carp |
| Series title | Management of Biological Invasions |
| DOI | 10.3391/mbi.2023.14.2.12 |
| Volume | 14 |
| Issue | 2 |
| Year Published | 2023 |
| Language | English |
| Publisher | Invasives.net |
| Contributing office(s) | Coop Res Unit Atlanta |
| Description | 15 p. |
| First page | 363 |
| Last page | 377 |
| Country | United States |
| State | Alabama, Georgia, Kentucky, Mississippi, North Carolina, Tennessee |
| Other Geospatial | Cumberland River basin, Kentucky Lake, Lake Barkley, Tennessee River basin |
| Google Analytic Metrics | Metrics page |