scholarly journals The watershed body: Transgressing frontiers in riverine sciences, planning stochastic multispecies worlds

2017 ◽  
Vol 3 (2) ◽  
pp. 1-32 ◽  
Author(s):  
Cleo Assan Woelfle-Erskine

In conversation with Eva Hayward’s writing on transgender embodiment, this paper explores how beaver modify landscapes differently than human engineers, and how human engineering might be transformed through riverine collaborations with beavers. Considering the body variously as a body of water — a river, which draws together all of the above and underground water in a watershed — as like our own trans bodies, and as a slippery double for the psyche of an Anthropocene engineer, July Cole and I argued that thinking with beaver as stochastic transgressors against Manifest Destiny engineering projects could transfigure engineers approaches to their work and river restoration more broadly. What if, rather than trapping beavers into service as “ecosystem engineers,” we assert that humans should engineer as beavers do, in ways that create porous boundaries between land and water and up- and downstream, by way of stick-and-mud, leaky, temporary dams? Here, I theorize a transfigured watershed body through human-beaver-salmon encounters at three salmon recovery sites in the Pacific west: a Karuk-led project on the Klamath river, agency-led beaver relocation projects in the Methow and Yakima watershed, and a citizen science-agency collaborative project in the beaverless Salmon Creek and Russian River watersheds. All three stories concern river and salmon recovery in the Pacific West, where either humans or beavers have initiated collaborative projects to raise water tables, keep rivers from going dry, and improve salmon habitat. These scientists and local knowledge holders’ encounters with beavers and their ponds thick with salmon are inspiring them to change how they undertake habitat restoration projects and also spurring some to reconsider the proper task of human ecologists and engineers, into a mode inspired by beavers themselves.   

Zootaxa ◽  
2018 ◽  
Vol 4429 (1) ◽  
pp. 157
Author(s):  
LUCIANA MARTINS ◽  
MARCOS TAVARES

Paulayellus gustavi, a new sclerodactylid genus and species, is described from the Pacific coast of Panama. The new genus and species is assigned to the subfamily Sclerothyoninae based on a suite of characters, which include the radial and interradial plates of the calcareous ring united at the base only. Paulayellus gen. nov. differs from the other Sclerothyoninae genera in having posterior processesof radial plates undivided. Additionally, differs from Sclerothyone, Thandarum and Neopentamera in having knobbed buttons, plates and cups in the body wall (whereas the body wall is furnished only with tables and plates in Sclerothyone, Temparena and Thandarum, and only with knobbed buttons and plates in Neopentamera). The new genus is, so far, monotypic. The also monotypic genus Neopentamera proved to have the radial and the interradial plates of the calcareous ring united at the base only, as typically found in the Sclerothyoninae, and is therefore transferred to that subfamily. The discovery of a new genus in the Sclerothyoninae and the transfer of Neopentamera required the amendation of the diagnosis for the subfamily. A key to the Sclerothyoninae is given. 


Author(s):  
Polina Shvanyukova ◽  

Texts authored by maritime explorers occupy a special place in the body of travel literature in English dealing with the exploration of the Pacific in the modern period. This article focuses on a specimen of scientific travel writing in epistolary form authored by Commander Matthew Flinders, the officer under whose command HMS Investigator completed the first circumnavigation of Australia in 1803. I analyse Matthew Flinders’s official despatch to Evan Nepean, Secretary of the Admiralty at the time, as an example of early nineteenth-century epistolary travel writing, paying special attention to the textual strategies employed by Flinders in order to produce a coherent and accurate travel account, on the one hand, and to negotiate his professional status and persona with his interlocutor(s), on the other.


1978 ◽  
Vol 22 (1) ◽  
pp. 303-303
Author(s):  
B.F. Lomov ◽  
V.F. Venda ◽  
Yu. M. Zabrodin

Only two levels of adaptation are used in the most present human engineering projects of information display systems—total and contingent. At the same time experimental and theoretical analysis of the statistical relationships between structures of information display and values of psychological factors of complexity of operators' problem solving shows that three additional levels of adaptation are necessary. There are group, individual and individually—operative levels. Some mathematical methods of evaluation of optimal distribution of information displays between individuals operators, combinations of man with different individual characteristics in one operators group are worked out.


Author(s):  
John A. Roebuck

An integrated system of mobility notation and standard techniques for measurement of spacesuit mobility is described. New terminology is proposed to describe human body movements for engineering workspace analysis and suit mobility specifications. Vector and link concepts are combined in a simplified model of man to describe body positions in terms of orientation of limbs with respect to a tri-planar angular coordinate system conceived as attached to the pelvic region. Numerical coding of the body links and joints is described. The notation system may be used as a basis for mathematical modeling for computer analysis of vehicle workspace geometry and control locations. The system is independent of gravitational reference semantic implications and sufficiently general for a wide range of complexity in kinesiological, medical, and human engineering applications.


2005 ◽  
Vol 8 (2) ◽  
pp. 237-273 ◽  
Author(s):  
Nicholas P. Lovrich ◽  
Michael J. Gaffney ◽  
Edward P. Weber ◽  
R. Michael Bireley ◽  
Dayna R. Matthews ◽  
...  

2014 ◽  
Vol 59 (3) ◽  
Author(s):  
Luis García-Prieto ◽  
Nallely Ruiz-Torres ◽  
David Osorio-Sarabia ◽  
Aldo Merlo-Serna

AbstractA new nematode species, Foleyellides rhinellae sp. nov. (Onchocercidae), is described from specimens found in the body cavity of the cane toad, Rhinella marina (Linnaeus) (Anura, Bufonidae), in the Laguna de Coyuca, Guerrero, in the Pacific slope of Mexico. The new species differs from the other nine species of Foleyellides by infecting bufonid anurans and by the number and arrangement of caudal papillae. Other distinguishing feature of the new species is the size of the left spicule (0.16–0.23 long), the smallest recorded among the species included in the genus. Foleyellides rhinellae sp. nov. is the second known species of the genus recorded from amphibians of Mexico.


Irriga ◽  
2008 ◽  
Vol 13 (3) ◽  
pp. 355-366
Author(s):  
João Carlos Cury Saad ◽  
José Cerilo Calegaro

WATER TABLE EFFECTS ON BEAN YIELD AND NITRATE DISTRIBUTION IN THE SOIL PROFILE  João Carlos Cury Saad; José Cerilo CalegaroRural Engineering Departament, School of Agronomic Sciences, Sao Paulo State University, Botucatu, SP, [email protected] 1 ABSTRACT              In order to evaluate the bean yield under different water table levels as well as the moisture and nitrate distribution in the soil profile, a field experiment was carried out in the experimental area of the College of Agricultural Sciences – UNESP, Botucatu, SP, Brazil. Beans were grown in field lysimeters under five water table depths: 30; 40; 50; 60 and 70 cm. The moisture in the soil profile was determined gravimetrically using samples collected at 10; 20;  30; 40; 50; 60 and 70 cm deep. The water table depths of 30cm and 40cm showed the highest productivities (3,228.4kg.ha-1 and 3,422.1kg.ha-1, respectively), with no statistical differences between them. The highest productivity was related to the two highest water table levels (30 and 40cm), which provided the highest moisture average values on the basis of volume in the soil profile (33.3 e 31%) as well as the consumptive use of water (416 and 396mm). The nitrate content during the bean cycle at the extraction depth of 60cm was below the safe drinking limit of 10mg.l-1 for water table depths of 30; 40; 50 and 60cm, which shows the denitrification efficiency as a way of controlling nitrate pollution in water tables. The management of water table can lead to high levels of bean yield and to a better control of nitrate pollution in underground water. KEY WORDS: lysimeters, soil moisture, denitrification.  SAAD, J. C. C.; CALEGARO, J. C. EFEITOS NO NÍVEL FREÁTICO NA PRODUTIVIDADE DO FEIJOEIRO E NA DISTRIBUIÇÃO DE NITRATO NO PERFIL DE SOLO  2 RESUMO Para avaliar a produtividade do feijoeiro submetido a diferentes níveis de lençol freático, a distribuição de umidade e a concentração de nitrato no perfil do solo, um experimento de campo foi conduzido na área experimental do Departamento de Engenharia Rural da FCA-Câmpus de Botucatu-UNESP. O feijão foi semeado em lisímetros de campo e submetido a cinco níveis de lençol freático, 0,30; 0,40; 0,50; 0,60 e 0,70m de profundidade a partir da superfície do solo. A  umidade no perfil do solo foi determinada pelo método gravimétrico, com amostras  obtidas à 0,10; 0,20; 0,30; 0,40; 0,50; 0,60 e 0,70m de profundidade. As profundidades de nível freático 0,30m e 0,40m apresentaram as maiores produtividades (3.228,4kg.ha-1 e 3.422,1kg.ha-1, respectivamente), não diferindo estatisticamente entre si. As maiores produtividades estiveram associadas aos dois níveis freáticos mais elevados (0,30 e 0,40m), que propiciaram os maiores valores médios de umidade à base de volume no perfil do solo (33,3 e 31%), as maiores lâminas totais (416 e 396 mm) e as maiores taxas de denitrificação (99,6 e 99,7%). O teor de nitrato durante o ciclo do feijoeiro, na profundidade de extração de 0,60m, esteve abaixo do limite tolerável de 10mg.l-1 para as profundidades de lençol freático de 0,30; 0,40; 0,50 e 0,60m, mostrando a eficiência da denitrificação como forma de controle da poluição do lençol freático por NO3-N. O manejo do lençol freático permite tanto a obtenção de elevados níveis de produtividade do feijoeiro como o controle da poluição das águas subterrâneas por nitrato. UNITERMOS: lisímetro,  umidade do solo,  denitrificação.


2021 ◽  
Author(s):  
Colby L. Hause ◽  
Gabriel P. Singer ◽  
Rebecca A. Buchanan ◽  
Dennis E. Cocherell ◽  
Nann A. Fangue ◽  
...  

AbstractExtirpation of the Central Valley spring-run Chinook Salmon ESU (Oncorhynchus tshawytscha) from the San Joaquin River is emblematic of salmonid declines across the Pacific Northwest. Habitat restoration and fish reintroduction efforts are ongoing, but recent telemetry studies have revealed low outmigration survival of juveniles to the ocean. Previous investigations have focused on modeling survival relative to river discharge and geographic regions, but have largely overlooked the effects of habitat variability. To evaluate the link between environmental conditions and survival of juvenile spring-run Chinook Salmon, we combined high spatial resolution habitat mapping approaches with acoustic telemetry along a 150 km section of the San Joaquin River during the spring of 2019. While overall outmigration survival was low (5%), our habitat-based classification scheme described variation in survival of acoustic-tagged smolts better than other candidate models based on geography or distance. There were two regional mortality sinks evident along the longitudinal profile of the river, revealing poor survival in areas that shared warmer temperatures but that diverged in chlorophyll-α, fDOM, turbidity and dissolved oxygen levels. These findings demonstrate the value of integrating river habitat classification frameworks to improve our understanding of survival dynamics of imperiled fish populations. Importantly, our data generation and modeling methods can be applied to a wide variety of fish species that transit heterogeneous and diverse habitat types.


Zootaxa ◽  
2020 ◽  
Vol 4894 (3) ◽  
pp. 403-412
Author(s):  
AOI TSUYUKI ◽  
YUKI OYA ◽  
NAOTO JIMI ◽  
HIROSHI KAJIHARA

We describe a new species of polyclad flatworm, Pericelis flavomarginata sp. nov., from the intertidal and subtidal zones along localities on the Pacific coast of Japan. Pericelis flavomarginata sp. nov. is characterized by i) the dorsal surface of the body fringed by a lemon-yellow line except for the tip of tentacles, with a narrow brown midline running from the anterior edge of the body to the posterior end of the pharynx, ii) the pair of marginal tentacles with the tips extending and tapering, and iii) the presence of a common gonopore. Our molecular phylogenetic analysis revealed that selected Pericelis species were divided into two clades, each of which may be agreed with a characteristic dorsal color pattern. Additionally, we report an observation on the feeding behavior of P. flavomarginata sp. nov. on the polychaete Iphione muricata (Savigny in Lamarck, 1818). 


Sign in / Sign up

Export Citation Format

Share Document