Foraging ecology of critically endangered Eastern Pacific hawksbill sea turtles (Eretmochelys imbricata) in the Gulf of California, Mexico.

The Eastern Pacific hawksbill sea turtle population is one of the most endangered of all sea turtle species. Here, we examine the foraging ecology of 47 hawksbill turtles (40.5-90.3 cm CCL, mean = 54.1 ± 10.1 cm) around Isla San José, Gulf of California, Mexico by integrating information from passive acoustic telemetry, behavior recordings, fecal analysis, and habitat surveys. Tagged hawkbill turtles exhibited high site fidelity over months and years (tracking duration 1-1490 days, mean = 255 ± 373 days) to the location and benthic habitat where individuals were initially caught. Diet was dominated by benthic invertebrates and algae including sponges, algae, tunicates, and mangrove roots. The mean percent cover of these benthic food items was significantly greater in the mangrove estuary than in adjacent rocky and sandy reef habitats. The Isla San José foraging ground is a high-use area for hawksbills and should be granted national protection status.

Anti-racist interventions to transform ecology, evolution and conservation biology departments.

Racial and ethnic discrimination persist in science, technology, engineering and mathematics fields, including ecology, evolution and conservation biology (EECB) and related disciplines. Marginalization and oppression as a result of institutional and structural racism continue to create barriers to inclusion for Black people, Indigenous people and people of colour (BIPOC), and remnants of historic racist policies and pseudoscientific theories continue to plague these fields. Many academic EECB departments seek concrete ways to improve the climate and implement anti-racist policies in their teaching, training and research activities. We present a toolkit of evidence-based interventions for academic EECB departments to foster anti-racism in three areas: in the classroom; within research laboratories; and department wide. To spark restorative discussion and action in these areas, we summarize EECB's racist and ethnocentric histories, as well as current systemic problems that marginalize non-white groups. Finally, we present ways that EECB departments can collectively address shortcomings in equity and inclusion by implementing anti-racism, and provide a positive model for other departments and disciplines.

Prairie dog decline reduces the supply of ecosystem services and leads to desertification of semiarid grasslands.

Anthropogenic impacts on North American grasslands, a highly endangered ecosystem, have led to declines of prairie dogs, a keystone species, over 98% of their historical range. While impacts of this loss on maintenance of grassland biodiversity have been widely documented, much less is known about the consequences on the supply of ecosystem services. Here we assessed the effect of prairie dogs in the supply of five ecosystem services by comparing grasslands currently occupied by prairie dogs, grasslands devoid of prairie dogs, and areas that used to be occupied by prairie dogs that are currently dominated by mesquite scrub. Groundwater recharge, regulation of soil erosion, regulation of soil productive potential, soil carbon storage and forage availability were consistently quantitatively or qualitatively higher in prairie dog grasslands relative to grasslands or mesquite scrub. Our findings indicate a severe loss of ecosystem services associated to the absence of prairie dogs. These findings suggest that contrary to a much publicize perception, especially in the US, prairie dogs are fundamental in maintaining grasslands and their decline have strong negative impacts in human well - being through the loss of ecosystem services.

Obtencion de proteinas unicelular de kluyveromyces lactis a partir de suero de queso

El acelerado incremento de la poblacion mundial hace que sea insuficiente las fuentes convencionales de proteinas como lo son, la ganaderia, la pesca y la agricultura. Por lo tanto el hombre ha tenido que recurrir a la obtencion de proteina unicelular, extraccion de proteina de productos agricolas y pesqueros no convencionales y proteinas modificadas por adicion de aminoacidos sinteticos para cubrir las necesidades de la poblacion. El presente trabajo permite la evaluacion de la produccion de proteina unicelular de Kluyveromyces lactis utilizando como substato un subproducto industrial como es el suero de leche. El suero de la leche que resulta de la coagulacion de la misma durante la elaboracion de queso, representa un serio problema de contaminacion ambiental cuando es vertido al curso de los rios debido a sus componentes; si consideramos que algunos de sus componentes poseen valiosas caracteristicas nutricionales como son: proteinas de alta calidad, vitaminas y minerales, se hace comprensible el creciente interes en el aprovechamiento de este subproducto. Se utiliza suero fresco, proveniente de la planta PIL La Paz, el mismo que es separado de sus proteinas antes de la fermentacion por termocuagulacion y acidificacion. El suero es usado como substrato para la produccion de biomasa, con la levadura Kluyveromyces lactis, la cual fue obtenida del Instituto Politecnico de Mexico.