Habitat preferences and simulation of physical habitat availability of Perlidae (Plecoptera) and Corydalidae (Megaloptera) in a neotropical river
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| Authors: | , , |
|---|---|
| Format: | artículo original |
| Status: | Versión publicada |
| Publication Date: | 2025 |
| Description: | Introduction: Habitat preferences represent the distribution and abundance of species among different habitat types. These preferences are highly relevant ecological information because they relate to the feeding strategies, offspring care and predator avoidance refuges of the organisms, therefore potentially influencing their fitness. Objective: To define the habitat preference of the nymphs of Anacroneuria spp. (Plecoptera) and larvae of Corydalus spp. (Megaloptera) with respect to current velocity and depth. Methods: We evaluated the abundance of Anacroneuria and Corydalus with information gathered through 15 field campaigns in three sites of the Savegre River, Costa Rica. Also, we used habitat preferences to create simulations of the physical habitat availability for these species through hydraulic models to determine habitat gain or loss due to variations in flow. Results: Anacroneuria (Plecoptera) nymphs preferred velocities of 0.9 m/s and depths between 23-36 cm, while Corydalus (Megaloptera) larvae preferred velocities between 0.6-0.8 m/s, and depths between 17-29 cm. As a case study, these preferences were modeled to determine optimal, regular or inadequate habitat availability for Anacroneuria and Corydalus given hypothetical flow variations in the Savegre River (Costa Rica). A discharge of < 8 m3/s resulted in a decrease in optimal habitat, mainly because it decreased water velocity below the preferred ranges. Also, a discharge of > 18 m3/s resulted in a decrease in optimal habitat because of the depth increase. Conclusions: This type of information is scarce or even absent for neotropical rivers, though necessary for a description of a healthy habitat. Furthermore, this habitat preference vs. modeled habitat availability approach is highly useful, -both in tropical and temperate rivers- for understanding the potential effects of any water derivation or exploitation. |
| Country: | Portal de Revistas UCR |
| Institution: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Language: | Inglés |
| OAI Identifier: | oai:portal.revistas.ucr.ac.cr:article/450 |
| Online Access: | https://revistas.ucr.ac.cr/index.php/rrbt/article/view/450 |
| Keyword: | aquatic insects stoneflies dobsonflies hydrobiological model river management insectos acuáticos moscas de la piedra megalópteros modelo hidrobiológico gestión fluvial |