Salamander occupancy in headwater stream networks

Evan H.Campbell Grant, Linda E. Green, Winsor H. Lowe

Research output: Contribution to journalArticlepeer-review

Abstract

1. Stream ecosystems exhibit a highly consistent dendritic geometry in which linear habitat units intersect to create a hierarchical network of connected branches. 2. Ecological and life history traits of species living in streams, such as the potential for overland movement, may interact with this architecture to shape patterns of occupancy and response to disturbance. Specifically, large-scale habitat alteration that fragments stream networks and reduces connectivity may reduce the probability a stream is occupied by sensitive species, such as stream salamanders. 3. We collected habitat occupancy data on four species of stream salamanders in first-order (i.e. headwater) streams in undeveloped and urbanised regions of the eastern U.S.A. We then used an information-theoretic approach to test alternative models of salamander occupancy based on a priori predictions of the effects of network configuration, region and salamander life history. 4. Across all four species, we found that streams connected to other first-order streams had higher occupancy than those flowing directly into larger streams and rivers. For three of the four species, occupancy was lower in the urbanised region than in the undeveloped region. 5. These results demonstrate that the spatial configuration of stream networks within protected areas affects the occurrences of stream salamander species. We strongly encourage preservation of network connections between first-order streams in conservation planning and management decisions that may affect stream species.

Original languageEnglish
Pages (from-to)1370-1378
Number of pages9
JournalFreshwater Biology
Volume54
Issue number6
DOIs
StatePublished - Jun 2009

Keywords

  • Dendritic ecological network
  • Headwater stream
  • Occupancy
  • Protected areas
  • Stream salamander

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