Evaluating two sampling methodologies for shrimp density and biomass estimates in streams

Moreira-Ferreira, Beatriz; Selhorst, Yasmin; Almeida, L. C.; Amaral, Jeferson Ribeiro; Silva, Élida F. da; Queiroz, Igor Raposo; Secchi, Karina G.; Zandonà, Eugênia

doi:10.1590/2358-2936e2020042

Cited by 1 publication

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“…The habitat use of the shrimp would also be closely associated to their predator-avoidance behavior (Leberer & Nelson, 2001). For example, nocturnal shrimps hide underneath or behind substrates such as stone and vegetation in water during the day to secure their survival (Pringle & Hamazaki, 1998;Mariappan & Balasundaram, 2003;Lammers et al, 2009;Moreira-Ferreira et al, 2020). The distribution of the shrimp would then be concentrated in shelter-rich habitats.…”

Section: ■ Introductionmentioning

confidence: 99%

Daytime habitat use and abundance of a freshwater shrimp <i>Macrobrachium yui</i> Holthuis, 1950 (Decapoda: Palaemonidae) in tropical forest stream, northern Laos

Kounthongbang¹,

Souliyamath²,

Chanthasone³

et al. 2021

Crust Res

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From 2008 to 2014, we monitored the abundance and daytime habitat use of the freshwater shrimp Macrobrachium yui at a fixed site on a tributary of the Xuang River in northern Laos. Throughout the monitoring period, the shrimp M. yui showed strong preference for cobble and small boulder substrates, as well as moderate preferences for 21-30 cm depth and the midstream (251-350 cm distance from the bank) as daytime habitat factors. The shrimp M. yui, on the other hand, exhibited intense avoidance for shallower water depths (less than 10 cm), stagnant (0 cm s −1 ) and faster water velocity (greater than 60 cm s −1 ), finer substrates (from silt to gravel), and stream margin (less than 50 cm from the bank). During the day, the habitat with the cobble and small boulder in the midstream is probably the best place for the shrimp M. yui to hide from predators. The abundance of the shrimp M. yui had positive and negative correlations with water depth and sand percentage in the bottom sediment, respectively. It suggests that a decrease in water depth caused by increased deposition of fine sediment from the catchment has a negative impact on the shrimp abundance.

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