Abstract
ABSTRACT The carapace length (CL) at the onset of morphological sexual maturity (MSM) in Aegla paranaSchmitt, 1942was estimated in a population located at Negro River Sub-basin, Upper Iguaçu Basin, southern Brazil. The animals were captured with Surber net and with baited traps in Negro River and in its tributary Totó River, in December/2017, June and July/2018. Carapace length of each individual was measured from the tip of the rostrum to the posterior margin of the carapace, with a digital caliper or under a digital microscope. Length of the major cheliped propodus (LMAP) of males and width of the abdomen (LA) of females were measured for relative growth analysis. The CL at the onset of MSM was estimated as the inflection points on the scatter plots with the REGRANS program. In Negro River, 107 males (CL range 6.90- 50.25 mm) and 95 females (10.37-39.36 mm) were obtained, while in Toto River, 225 males (4.92-25.65 mm) and 160 females (5.18- 26.45 mm). MSM is attained by males at 23.15 mm CL and females at 17.85 mm CL. The smallest ovigerous female measured 19.00 mm CL. Aegla parana reaches the highest maximum size and males attain MSM with the highest CL value among the known species of the genus.
Highlights
The carapace length (CL) at the onset of morphological sexual maturity (MSM) in Aegla parana Schmitt, 1942 was estimated in a population located at Negro River Sub-basin, Upper Iguaçu Basin, southern Brazil
Aegla parana Schmitt, 1942 is distributed along Iguaçu Basin (62,000 km2) between the southern Paraná State and the northern Santa Catarina State and along south of Paraná River, having as type locality the Negro River, located on west side of Serra do Mar mountains, separating the states of Santa Catarina and Paraná until it empties into the Iguaçu River
Considering the importance of understanding the biological patterns of the group for future projects on conservation purpose, this study aims to estimate the size of onset of MSM for understanding aeglid biology of males and females of a population of A. parana living in Negro River Sub-basin, type locality of the species and quoted only from the description article of the species, based on their relative growth
Summary
The carapace length (CL) at the onset of morphological sexual maturity (MSM) in Aegla parana Schmitt, 1942 was estimated in a population located at Negro River Sub-basin, Upper Iguaçu Basin, southern Brazil. Maturidade sexual morfológica do caranguejo anomuro Aegla parana (Crustacea, Decapoda, Aeglidae) da sub-bacia do Rio Negro, bacia do Alto Iguaçu, sul do Brasil. O comprimento da carapaça (CL) no início da maturidade sexual morfológica (MSM) em Aegla parana Schmitt, 1942 foi estimado em uma população que ocorre na Sub-bacia do Rio Negro, Bacia do Alto Iguaçu, sul do Brasil. Negro River flows between some municipalities as of Mafra, Santa Catarina
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