Ecological and life-history correlates of erythrocyte size and shape in Lepidosauria.

Blood oxygen-carrying capacity is shaped both by the ambient oxygen availability as well as species-specific oxygen demand. Erythrocytes are a critical part of oxygen transport and both their size and shape can change in relation to species-specific life-history, behavioural or ecological conditions. Here, we test whether components of the environment (altitude), life history (reproductive mode, body temperature) and behaviour (diving, foraging mode) drive erythrocyte size variation in the Lepidosauria (lizards, snakes and rhynchocephalians). We collected data on erythrocyte size (area) and shape (L/W: elongation ratio) from Lepidosauria across the globe (N = 235 species). Our analyses show the importance of oxygen requirements as a driver of erythrocyte size. Smaller erythrocytes were associated with the need for faster delivery (active foragers, high-altitude species, warmer body temperatures), whereas species with greater oxygen demands (diving species, viviparous species) had larger erythrocytes. Erythrocyte size shows considerable cross-species variation, with a range of factors linked to the oxygen delivery requirements being major drivers of these differences. A key future aspect for study would include within-individual plasticity and how changing states, for example, pregnancy, perhaps alter the size and shape of erythrocytes in Lepidosaurs.

Introducing 'Ngaruroro', a New Model for Understanding Maori Wellbeing.

Indigenous peoples around the world are revitalising their ancestral beliefs, practices, and languages, including traditional understandings of health and wellbeing. In the Aotearoa (New Zealand) context, a number of ground-breaking Maori health- and wellbeing-related models have emerged, each with their own scope and applications. We sought in our qualitative studies to explore and identify several key sources of wellbeing for Maori individuals. Nine interviews were conducted with members of Maori communities to identify key themes of Maori wellbeing. We performed a Reflexive Thematic Analysis on these data and then conducted a further fifteen interviews to revise, refine, and reposition the previously generated themes. The Ngaruroro model describes wellbeing as the embodied and active process of being well in relation with one's (1) here tangata (social and familial ties), (2) te taiao (the environment), and (3) taonga tuku iho (cultural treasures) while doing what one can to make lifestyle choices that are conducive to the health of one's (4) tinana (body) and (5) wairua (spirit) while cultivating a balanced (6) ngakau (inner-system), fulfilling (7) matea (core needs) and exercising your (8) mana (authority). These themes illustrate that Maori wellbeing is dynamic, interconnected, and holistic.