Regeneración celular: una segunda oportunidad de vida

Las cabezas de la hidra que resurgen al ser cortadas o las extremidades perdidas en batalla que vuelven a aparecer en algunos seres, no son solo ficciones. Prácticamente todos los seres vivos tienen la capacidad de regenerarse, en especial las plantas. Aunque en grado menor, la regeneración celular también es una característica humana y sus aplicaciones en medicina podrían implicar una nueva oportunidad de vida. Fotogalería: https://www.ecosur.mx/regeneracion-celular-una-segunda-oportunidad-de-vida

Potential present and future distributions of the genus Atta of Mexico.

Temperature and precipitation influence insect distribution locally and drive large-scale biogeographical patterns. We used current and future climate data from the CHELSA database to create ensemble species distribution models for three Atta leaf-cutting ant species (Atta cephalotes, A. mexicana, and A. texana) found in Mexico. These models were used to estimate the potential impact of climate change on the distribution of these species in the future. Our results show that bioclimatic variables influence the distribution of each Atta species occupying a unique climatic niche: A. cephalotes is affected by temperature seasonality, A. mexicana by isothermality, and A. texana by the minimum temperature of the coldest month. Atta texana and A. mexicana are expected to decline their range by 80% and 60%, respectively, due to rising temperatures, decreased rainfall, and increased drought. Due to rising temperatures and increased humidity, Atta cephalotes is expected to expand its range by 30%. Since Atta species are important pests, our coexistence with them requires knowledge of their ecological functions and potential future distribution changes. In addition, these insects serve as bioindicators of habitat quality, and they can contribute to the local economy in rural areas since they are eaten as food for the nutritional value of the queens. In this sense, presenting a future perspective of these species' distribution is important for forest and crop management. Education programs also are necessary to raise awareness of the importance of these ants and the challenges they face because of climate change. Our results offer a perspective of climate change studies to define conservation and adaptation strategies for protecting vulnerable areas such as high-elevation remnant forests

First record of oviposition event by Laemanctus longipes (Sauria: Corytophanidae) in Mexico

Oviposition in elusive reptiles has been poorly documented due to the difficulty in observing it in natural habitats. Here, we document the first egg-laying record in the Eastern Casque-headed Basilisk Laemanctus longipes in the wild. Our record adds novel information about the oviposition of this scarcely studied reptile species

Primer reporte de puesta de huevos de Laemanctus longipes (Sauria: Corytophanidae) en México

Oviposition in elusive reptiles has been poorly documented due to the difficulty in observing it in natural habitats. Here, we document the first egg-laying record in the Eastern Casque-headed Basilisk Laemanctus longipes in the wild. Our record adds novel information about the oviposition of this scarcely studied reptile species. La oviposición en especies elusivas de reptiles ha sido escasamente registrada en vida libre debido a la dificultad para observarla. En este trabajo documentamos por primera vez un evento de puesta de huevos en vida libre del toloque verde Laemanctus longipes en el centro del estado de Veracruz, México. Este registro agrega información novedosa sobre la oviposición de esta especie de reptil poco estudiada.

Bioclimatic variables used to predict the distribution of three Mexican <i>Atta</i> leaf-cutting ant species and their importance (%).

Bioclimatic variables used to predict the distribution of three Mexican Atta leaf-cutting ant species and their importance (%).</p

Exploratory visualization of niche separation.

Niche separation between the Atta genus niche’s three species (shared variables). A three-dimensional representation was used to visualize the ecological niches of the three Atta leaf-cutting ant species based on principal components (PC). Minimum Volume Ellipsoids were used to represent the boundaries of the species’ environmental distributions. The green ellipsoid represents A. cephalotes, the blue ellipsoid corresponds to A. mexicana, and the orange ellipsoid represents A. texana. Gray dots represent the environmental conditions where the species have been observed, as determined by the Principal Components Analysis (PCA) of the five shared variables (S2 Table).</p

Thresholds established to categorize the suitability and evaluation metrics applied to the ESDM for each Mexican <i>Atta</i> leaf-cutting ant species studied.

Thresholds established to categorize the suitability and evaluation metrics applied to the ESDM for each Mexican Atta leaf-cutting ant species studied.</p

Species ecoregions.

Ecoregions selected for each species based on known distribution: calibration using Olson et al.’s [21] terrestrial ecoregions model (M space). (XLSX)</p

Potential distribution of <i>Atta</i> species.

The possible distribution of A. cephalotes in the a) current; b) future; A. mexicana in the c) current; d) future; and A. texana in the e) current; f) future. In the case of the current scenario, suitability is shown, and in the future scenario, the number of models that predict the distribution is shown.</p