La larva de Parachrysina parapatrica Deloya y Morón, 1988 se describe por primera vez con base a especímenes procedentes del Valle de Tehuacán, localidad de Santa Ana, municipio de Teloxtoc, Puebla, ...México. Las larvas se recolectaron en raíces de amaranto (Amaranthus hipochondriacus L.) y se criaron hasta obtener pupas y adultos. Se incluyen ilustraciones de las estructuras de importancia taxonómica y comentarios sobre su biología.
The objectives of the present work were to determine the species of bats as floral visitors of Stenocereus huastecorum Alvarado-Sizzo, Arreola-Nava & Terrazas, 2018 in the Jaumave Valley, the night ...activity patterns of these floral visitors, their abundance within the flowering periods of 2018 and the comparison of effectiveness of nocturnal and diurnal pollinators. During March-May and August-October 2018, 12 nights were sampled per flowering period using three mist nets of 12 x 2.6 meters. Bats captured were identified, samples of pollen were taken from them which was processed by Erdtman's acetolysis. Three different treatments were applied to evaluate pollination effectiveness (nocturnal exclusion, diurnal exclusion, and control), selecting three flowers in 19 individuals. Leptonycteris yerbuenae (Martínez & Villa, 1940), L. nivalis (Saussure, 1860) and Choeronycteris mexicana (Tschudi, 1844) were the nocturnal floral visitors of S. huastecorum during its two flowering periods, the first species being the most frequently recorded throughout the night. Although this species has flowers with chiropterophilous characteristics, no significant differences were found in the effectiveness of diurnal, nocturnal and control pollinators. Very little is known about the nocturnal floral visitors of S. huastecorum and the effectiveness of its pollinators in the north of its distribution. Since this species is very important for the economy of rural communities due to the sale of its fruits, this research provides basic information for the conservation and use of this species.
Se registra al escarabajo acuático de dedos largos Postelichus musgravei (Hinton, 1935) (Coleoptera: Byrrhoidea: Dryopidae) para el estado de Nuevo León, México, siendo, el primer registro de la ...familia Dryopidae para este estado, así como el registro más norteño de esta especie. Además, se presenta un listado de especies de la familia Dryopidae de México y una clave de identificación para los géneros encontrados en Norteamérica continental.
Abstract The period of migration can pose significant energetic challenges as birds attempt to reach their destinations. Suitable stopover habitat is, therefore, important to the success of migrating ...individuals, especially as they move along major migration corridors and geographic features, like coastlines. In this study, we used metrics of individual body condition (i.e. fat score, size-corrected body mass, and refueling rate) of fall migrants as they moved across the Gulf of Maine region, a complex coastal landscape. We investigated the extent to which these body condition indices varied by stopover site geography (island vs. mainland) and how these spatial patterns varied with species-specific characteristics such as migratory distance, foraging guild, and age. Geography was an important factor explaining variation in all 3 condition indices, and age explained additional variance in 2 of the 3. In general, individuals captured on islands exhibited significantly lower energetic condition than individuals on the mainland, and this pattern held true across all migratory strategies and foraging guilds. Immature individuals had, on average, lower energy reserves, with less fat and lower size-corrected mass than adults among all stopover sites. We also found that at all sites, size-corrected body mass, on average, significantly increased over the capture day, providing evidence that both island and mainland sites provided energetically beneficial stopover habitat. Our finding that birds offshore are in lower body condition at capture than those along the coast is suggestive that birds use mainland sites for longer stopover bouts than island sites, or that poorer condition birds reorient to land during over-water movements disproportionately use off-shore islands as their initial landing area. Decreases in either island or mainland stopover site availability or quality may affect individual fitness, with population-level consequences, but through different ways.
A new species of whitefly, Aleuropleurocelus petenensis sp. nov. Carapia-Ruiz & García-Ochaeta, found on leaves of a plant belonging to the genus Acalypha (Euphorbiaceae) in Petén, Guatemala, is ...described based on characteristics of the pupa. This new species exhibits a black venter and has microtubercles on the subdorsal and submedian areas, whereas the most closely related species, A. mixtecus Carapia-Ruiz, presents a pale venter and has not microtubercles on the corresponding areas. In both species the transverse suture of the molt ends before the apparent margin and the dorsal surface presents folds; these features support the close relationship between these species. Microphotographs of morphological structures of the new species puparium are provided.
This study focuses on species richness, abundance, diversity, and seasonal variation of spiders in two coffee plantations with different crop management and a portion of tropical forest in two ...municipalities of La Costa region of Oaxaca, Mexico, using manual collection, foliage beating and pitfall traps. We collected 2,210 spiders belonging to 35 families, 100 genera and 146 species. The inventory includes 51 new species records for Oaxaca. Completeness values for two estimators indicate that the level of representation of inventories range from 68.25% to 78.44%, and the proportion of singletons range from 33.72% to 38.14%. Spider abundance in the rainy season was significantly lower than during the dry season. Spider abundance in the Tropical Forest was significantly lower than Monoculture site with the foliage beating method. Polyculture was the site with the lowest spider abundance with the pitfall traps. Rarefaction curves did not show significant differences in species richness between the sites and seasons. Hutcheson t-test showed that spider diversity was significantly lower in Monoculture than Tropical Forest during the rainy season. This study contributes to the knowledge of the arachnofauna of Mexico and particularly of the state of Oaxaca.
Se presenta la información hasta la fecha del género pantropical Holocompsa Burmeister, 1838, con énfasis en México. Adicionalmente, se describe una nueva especie con base en material colectado en ...Yucatán, México. Se propone una guía taxonómica para las especies americanas.
Abstract Migratory birds encounter the Great Lakes while moving through eastern North America toward breeding grounds to the North, which offers a good opportunity to study variation in migratory ...behavior as birds face a potentially influencing topographical feature. Using passive infrared technology, we documented the direction of relatively low-flying, nocturnal, mostly passerine migration in spring along the southern coast of Lake Erie’s western basin. We examined the extent to which spring migrants flew across Lake Erie as a continuation of the inland, northeasterly broad front migratory direction, as determined by weather radar and infrared observations, or displayed a tendency to deviate to more closely follow the direction of the coastline. We found that an estimated 62% of all low-flying migrants deviated their flight directions toward the coast of Lake Erie at 2 coastal sites, Cedar Point and Ottawa, which were characterized by northwest–southeast oriented coastlines. Migrants at a third coastal location, Maumee Bay, which has a more east–west oriented coastline, did not display similarly deviated flight directions. We found that even when winds were energetically favorable for a lake crossing, many migrants still routinely displayed deviated flight directions that approached paralleling the coastline. Further, the mean flight direction at one site, Ottawa, shifted more in the direction of the coastline as the night progressed, suggesting that time of night could influence the shift to a more coastal flight direction. The data indicate that the western basin of Lake Erie acts as a salient topographical feature influencing the flight directions of nocturnal migrants. The data further suggest that birds are making active decisions while in flight, based on current environmental and physiological conditions, about whether to continue to cross Lake Erie or take a coastal detour.
Los picudos (Coleoptera: Curculionidae) son una de las principales plagas en los sistemas de producción citrícola debido a su distribución y forma de alimentación. El objetivo del presente trabajo ...fue identificar morfológicamente las especies de picudos asociados al cultivo de limón persa (Citrus latifolia Tanaka) en la zona citrícola del municipio de Huimanguillo, Tabasco, México. Las capturas de picudos se realizaron de manera directa en la copa de los árboles, de septiembre de 2019 a febrero de 2021, para un total de 17 muestreos en tres plantaciones de limón persa, dos con manejo convencional y una con manejo orgánico, cada una con parcelas útiles de dos hectáreas (624 plantas). Se colectaron 1,039 picudos correspondientes a cuatro morfoespecies, de las cuales 240 se identificaron morfológicamente como Epicaerus sp. (1), 355 como Epicaerus sp. (2), 112 como Exophthalmus opulentus y 332 como Cleistolophus subfasciatus.
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