Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X0523
Acta Limnologica Brasiliensia
Original Article

Length-dry mass regressions for Leptonema (Trichoptera, Hydropsychidae) larvae in a Neotropical headwater stream

Equações de comprimento-massa seca para larvas de Leptonema (Trichoptera, Hydropsychidae) em um riacho de cabeceira Neotropical

Amanda de Melo Coelho; Pedro Henrique Monteiro do Amaral; Marden Seabra Linares; Marcos Callisto

http://dx.doi.org/10.1590/S2179-975X0523 Acta Limnol. Bras. (Online), vol.35, e5, 2023
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Abstract

Abstract:: Aim: The objectives of this study were to evaluate which allometric measurements of Leptonema larvae are most suitable in order to develop mathematical equations to describe biomass relationships for the population of this taxon in a reference condition headwater stream.

Methods: We measured four body dimensions (body length, interocular distance, horizontal width of cephalic capsule and vertical width of the cephalic capsule) of 65 Leptonema larvae, which were collected in February 2022, in the Taboões spring, Serra do Rola Moça State Park, Minas Gerais, using a Surber sampler. For the determination of allometric measurements, each individual was photographed under a dissecting stereomicroscope (Leica M80) equipped with a digital camera. Each photographed specimen's length was measured using the Motic Image Plus 2.0 software. After measuring the linear body dimension and direct measurement of the biomass, we used these values ​​to calculate the length-mass mathematical equations. To the equations use power models: DM = a Lb, where a/b are constants, DM is the dry mass, L is the linear body dimension.

Results: Among body dimensions of Leptonema larvae, body length showed the greatest range of variation, with values ranging from 4.03 to 25.28 mm, followed by head capsule vertical width (0.51 - 2.69 mm), head capsule horizontal width (0.55 - 2.22 mm) and interocular distance (0.24 - 1.88 mm). Our results show that body length provided the best-fitting equation for estimating biomass (R2 = 0.90). However, we observed a close fit between the other allometric measures, including high coefficients of determination, head capsule horizontal width (R2 = 0.85), interocular distance (R2 = 0.82), head capsule vertical width (R2 = 0.78).

Conclusions: These results will be useful in providing the best allometric measurement and equations to estimate the biomass of Leptonema larvae from the tropics.

Keywords

allometric measures, biomass, body dimensions, invertebrates

Resumo

Resumo:

Objetivo: Os objetivos deste estudo foram avaliar quais medidas alométricas do corpo das larvas de Leptonema são mais adequadas, a fim de desenvolver equações matemáticas para descrever as relações de biomassa para a população deste táxon em riachos de cabeceira.

Métodos: Foram medidas quatro dimensões corporais (comprimento corporal, distância interocular, largura horizontal da cápsula cefálica e largura vertical da cápsula cefálica) de 65 larvas de Leptonema, que foram coletadas no mês de fevereiro de 2022, no manancial Taboões, Parque Estadual da Serra do Rola Moça, Minas Gerais, utilizando amostrador Surber. Para a determinação das medidas alométricas, cada indivíduo foi fotografado em um estereomicroscópio dissecante (Leica M80) equipado com câmera digital. O comprimento de cada espécime foi medido usando o software Motic Image Plus 2.0. Após a medição da dimensão corporal linear e medição direta da biomassa, utilizamos esses valores para calcular equações comprimento-massa. Para às equações, usamos modelos de potência: DM = a Lb, onde a/b são constantes, DM é a massa seca, L é a dimensão corporal linear.

Resultados: O comprimento do corpo apresentou a maior variação, com valores variando de 4,03 a 25,28 mm, seguido pela largura vertical da cápsula cefálica (0,51 - 2,69 mm), largura horizontal da cápsula cefálica (0,55 - 2,22 mm) e distância interocular (0,24 - 1,88 mm). Nossos resultados mostram que o comprimento do corpo forneceu a equação de melhor ajuste para estimar a biomassa (R2 = 0,90). No entanto, observamos um ajuste próximo entre as demais medidas alométricas, retornando altos coeficientes de determinação, largura horizontal da cápsula cefálica (R2 = 0,85), distância interocular (R2 = 0,82), largura vertical da cápsula cefálica (R2= 0,78).

Conclusões: Esses resultados podem ser úteis para fornecer as melhores medidas alométricas e equações para estimar a biomassa de larvas de Leptonema de riachos tropicais.
 

Palavras-chave

medidas alométricas, biomassa, dimensões corporais, invertebrados

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Submitted date:
01/18/2023

Accepted date:
03/03/2023

Publication date:
04/10/2023

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