Scatrina Pooping Outdoor ❲PLUS | FIX❳
We thank the Karnataka Forest Department for research permits, the field assistants (R. Nair, S. Patil) for diligent data collection, and Dr. L. Bhatia for valuable statistical advice. Funding was provided by the Indian Council of Agricultural Research (Grant ICAR‑2023‑EF‑09).
The observed concentration of feces on sapling undersides suggests a deliberate behaviour rather than random deposition. By excreting while perched, Scatrina may reduce exposure to ground‑dwelling predators and parasites (Kumar & Singh, 2019). Moreover, positioning feces near the plant base could facilitate rapid incorporation of nutrients into the leaf‑litter layer, indirectly benefiting the beetles’ fungal food sources.
The genus Scatrina (Order Coleoptera, Family Scatrinidae) comprises a group of nocturnal, arboreal beetles endemic to the low‑land rainforests of the Western Ghats. Despite extensive research on their foraging and reproductive strategies, little is known about their excretory behaviour in natural settings. This study documents the spatial patterns, temporal rhythms, and ecological consequences of Scatrina outdoor defecation (“pooping”) across three forest fragments (30 ha, 45 ha, and 60 ha). Using motion‑activated camera traps, fecal pellet counts, and stable‑isotope analysis, we show that Scatrina preferentially deposit feces on the undersides of broad‑leaf saplings within 1 m of their perching sites, primarily during the first two hours after sunset. The fecal deposits are rich in nitrogen (average 2.8 % N dry weight) and phosphorus (0.42 % P), contributing significantly to the nutrient pool of the leaf‑litter layer. We also demonstrate that these deposits attract a distinct assemblage of detritivorous micro‑fauna, thereby enhancing micro‑habitat complexity. Our findings suggest that Scatrina outdoor pooping is a non‑random, ecosystem‑engineered behaviour with measurable impacts on nutrient cycling and forest floor biodiversity. Management recommendations include preserving understory sapling diversity to maintain these ecological processes. Scatrina Pooping Outdoor
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From 1 May to 30 September 2024, 30 m² plots were established in each fragment (10 plots per site). Each plot contained a grid of 1 m² quadrats. Motion‑activated infrared cameras (ReconCam X5) were installed at 0.5 m height, facing the underside of saplings (DBH < 10 cm). Cameras recorded 24 h a day, storing 30‑second clips upon detection of motion. The observed concentration of feces on sapling undersides
Quadrats with higher pellet density (> 15 pellets m⁻²) supported significantly greater abundance of Collembola (springtails) and Nematoda (p < 0.001, mixed‑effects model). Linear regression revealed that each additional 5 pellets m⁻² increased total detritivore abundance by 12 % (β = 0.024 ± 0.006, t = 4.02). Species richness of micro‑fauna was also positively correlated with fecal density (R² = 0.31, p = 0.004).
Dried fecal samples (n = 180) were ground to a fine powder. Total nitrogen (N) and phosphorus (P) were measured using an elemental analyser (EA‑3000) and inductively coupled plasma optical emission spectrometry (ICP‑OES), respectively (AOAC, 2016). Stable‑isotope ratios (δ¹⁵N, δ¹³C) were determined to infer dietary sources.
Our data demonstrate that Scatrina acts as a “bioturbator” at the micro‑scale, creating nutrient‑rich patches that attract detritivores. This aligns with the concept of “ecosystem engineers” (Jones et al., 1994), where the activities of a single species generate habitat heterogeneity. The enhanced abundance of Collembola and Nematoda may, in turn, accelerate litter decomposition, closing a feedback loop that sustains the beetles’ fungal diet.
