Boletín del Centro de Investigaciones Biológicas

Tabla de Contenido

Teresa Martínez Leones — 2025-08-25

Distributional note of the world species of Paracymus Thomson, 1867 (Coleoptera: Hydrophilidae) in five biogeographical regions

Mauricio García — 2025-08-25

An updated global catalog of the aquatic Coleoptera species of the genus Paracymus Thomson, 1867 is presented. This inventory covers the five biogeographic regions in which the genus is distributed, providing a complete and up-to-date overview of species diversity worldwide.

Laguncularia racemosa (L.) Gaertn. more than halophyte a halotolerant species

Ana Marta Francisco — 2025-08-25

Laguncularia racemosa grows on soils varying widely in interstitial water salinity, and among the mangrove species in the American tropics, is characterized by salt secretion through leaves, development of succulence, and higher Ca concentration in leaf tissues. Investigate interactions between cations uptake and salinity in the determination of biomass and nutrient allocation and growth responses under salt-free growing conditions up to 20-25 ppm, to show whether or not halophytic character in propagules of L. racemosa from seasonal lagoon, were cultivated in a greenhouse in 40% Hoagland solution and salinities of 0, 5, 10 and 20 ‰, during 9 months. Measurements of: a) growth (allometric); b) soluble sugars (colorimetric); c) osmolality (Osmometer) and soluble cations (AA) in leaf sap, d) Ca fractions in whole leaf, (AA) e) concentrations of N (microKjeldahl), P (colorimetric), and K, Mg, Ca, Na, in biomass. Maximum plant height, and biomass, was found growing without salt. Decreased with salinity too in stems, but not in roots. Daily sugar accumulation in leaves, decreased with salinity. Increasing salinity of nutrient solutions reduced leaf concentrations of K, Mg, and Ca in leaf sap and bulk tissues. In leaves, Ca > Mg, K, whereas in roots, K increased, and Ca and Mg varied little with salinity. The major fraction of Ca by all treatments was as oxalate. Despite being a species of halophytic character, it grows better at low or without salinity in the culture medium. Then, it is a "halotolerant" species, but is more favored with less or no salinity.

Identification of free living amoeba and testate amoeba from sediments using to DNA probes

Silvana Beatriz Pertuz Belloso — 2025-08-25

The free living amoeba belong to Gymnamoeba have important members from soil and sediments, and the others aquatic ecosystems. In the sea aquatic ecosystems have species that belong an others taxonomic kind. We found in this description Acanthamoeba species and Mayorella species from sediments. Others genus founded belong to sea environment, as Vexilifera. Species from sea environment of testate amoeba were identified from sediments, as Arcella species. This study was realized in the mangroves bank from Morro (Veracruz); zone in which realized sampled of sediments, using to process of filter and dilution with saline solution (0.8%) until produce to supernatant for mounting this protist and their identification by fluorescence microscopy using to fluorocromo as DNA probes. In this work were identified 6 genera of Gymnamoeba and 2 genera of testate amoeba for identification by DNA probes by analyzed and build a cataloguist of many species founded from sediments.

New record of Dysdercus collaris Blöte, 1931 (Hemiptera: Heteroptera: Pyrrhocoridae) as a host of Pavonia paniculata Cav. (Malvales: Malvaceae)

Jorge Gámez — 2025-08-25

Dysdercus collaris Blöte, 1931, is reported for the first time as host of Pavonia paniculata Cav. The hemipteran, both nymphs and adults, feed by sucking fluids from floral structures, seed and fruit tissues, and based on the presence of pollen on the insect´s body, it is likely that insect contributes to the pollination of Malvaceae. Dysdercus collaris appears to have a strong affinity for the Malvaceae family and has so far been observed in the genera Sida L. and Pavonia Cav. in Mérida state, Venezuela. Knowledge of the wild host plants of D. collaris could aid in the monitoring of the hemipteran in locations where commercial plants or crops such as cotton are grown.

Instrucciones a los autores

Teresa Martínez Leones — 2025-08-25

Instructions for Contributors

Teresa Martínez Leones — 2025-08-25