Ivan Arismendi

Ivan Arismendi
Oregon State University | OSU · Department of Fisheries Wildlife and Conservation Sciences

He/him/his

About

133
Publications
33,096
Reads
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2,488
Citations
Introduction
Freshwater ecology and conservation focusing on aquatic invasions, climate change, food webs as well as the consequences of natural and human-related disturbances in freshwaters. In addition, topics related to diversity, equity, and inclusion in science.
Additional affiliations
September 2021 - August 2022
Oregon State University
Position
  • Professor (Associate)
September 2016 - September 2021
Oregon State University
Position
  • Professor (Assistant)
May 2014 - June 2015
Oregon State University
Position
  • Instructor
Description
  • Limnology 456/556 (5 credits) - spring term
Education
March 2006 - January 2010
Universidad Austral de Chile
Field of study
  • Doctorate in Forest Sciences

Publications

Publications (133)
Article
Full-text available
1] Temperature is a fundamentally important driver of eco-system processes in streams. Recent warming of terrestrial climates around the globe has motivated concern about con-sequent increases in stream temperature. More specifically, observed trends of increasing air temperature and declining stream flow are widely believed to result in correspond...
Article
Full-text available
In order to evaluate the present distribution patterns of salmonids and their potential effects on native fish. we sampled 11 large lakes and 105 streams, encompassing a total of 13 main hydrographic watersheds of southern Chile (39 degrees to 52 degrees S). Overall, trout (Salmo trutta and Oncorhynchus mykiss) accounted for more thin 60% of total...
Article
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Biological invasions create complex eco-logical and societal issues worldwide. Most of the knowledge about invasions comes only from success-ful invaders, but less is known about which processes determine the differential success of invasions. In this review, we develop a framework to identify the main dimensions driving the success and failure of...
Article
Full-text available
A diverse workforce in science can bring about competitive advantages, innovation, and new knowledge, skills, and experiences for understanding complex problems involving the science and management of natural resources. In particular, fisheries sciences confronts exceptional challenges because of complicated societal-level problems from the overexp...
Article
Transport of fine-grained sediment from unpaved forest roads into streams is a concern due to the potential negative effects of additional suspended sediment on aquatic ecosystems. Here, we compared turbidity and suspended sediment concentration (SSC) dynamics in five non-fish bearing coastal Oregon streams above and below road crossings, during th...
Article
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Aim Climate change is broadly affecting phenology, but species‐specific phenological response to temperature is not well understood. In streams, insect emergence has important ecosystem‐level consequences because emergent adults link aquatic and terrestrial food webs. We quantified emergence timing and duration (within‐population synchronicity) of...
Article
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In US academic institutions, efforts often concentrate on enhancing the recruitment of students from underrepresented groups, focusing on gender and/or race. However, little attention has been paid to nondemographic forms of diversity, such as environmental worldviews (i.e., differences in the metaphysical, epistemological, and ethical beliefs that...
Chapter
The management and conservation of inland waters involves working with diverse groups of people and partners across a wide array of fisheries and aquatic resources. Here, we extracted historical authorship information (2006–2020) from published articles in 18 fish-related international journals to understand the productivity and impact of women inv...
Article
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Until the 1980s, large wood removal from streams was widely promoted across North America because in-stream logs were considered undesirable. At present, millions of dollars are invested annually to place large wood back in streams owing to its importance for the geomorphology of channels, stream discharge, sediment deposits, and habitat for fish....
Article
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Marine derived nutrients (MDN) contained in gametes (mature eggs and sperm), carcasses and metabolic wastes from anadromous migratory salmon can transfer energy and materials to fresh water, thereby affecting the structure and function of stream ecosystems. This is crucial among ecosystems where humans have mediated biological invasions by propagat...
Article
Here, we review extensive information to estimate environmental risks from escaped non‐native salmonids based on the assessments of hazard, sensitivity and exposure of discrete water bodies in Chile. In 2020, the country harvested about 1 million tons salmonids from net pens located along 1500 km of highly biodiverse coastline. We base our analysis...
Article
Documenting species invasions and assessments of ecological changes depend on detection. Here, we present a simple design of a plankton light trap with specific wavelength LEDs and modifications. We used PVC pipe to create standardised small, rigid, low-cost traps that can be deployed in lentic habitats. With a cost of under $30 US each, including...
Article
Full-text available
The introduction of non-native species can negatively impact native species through reduced genetic fitness resulting from hybridization. The lack of spatiotemporal data on hybrid occurrences makes hybridization risk assessment difficult. Here, we developed a spatially-explicit Hybridization Risk Model (HRM) between native Oregon bull trout, an End...
Conference Paper
Full-text available
Early detection methods are critical for the effective management of biological invasions. Escapes from salmon aquaculture facilities can lead to the naturalization of nonnative species. Massive escapes from aquaculture net-pens (approximately one million fish per year), predominantly Atlantic salmon Salmo salar, occur in Southern Chile. Similarly,...
Article
Despite significant investments in watershed‐scale restoration projects, evaluation of their impacts on salmonids is often limited by inadequate experimental design. This project aimed to strengthen study designs by identifying and quantifying sources of temporal and spatial uncertainty while assessing population‐level salmonid responses in Before‐...
Preprint
In U.S. academic institutions, efforts often concentrate on enhancing the recruitment of students from underrepresented groups, focusing on gender and/or race. Yet, non-demographic forms of diversity have received little attention, such as environmental worldviews, i.e., differences in the metaphysical, epistemological, and ethical beliefs that def...
Article
Full-text available
Freshwaters are important, interconnected, and imperiled. Aquatic ecosystems, including freshwater fishes, are closely tied to the terrestrial ecosystems they are embedded within, yet available spatially explicit datasets have been underutilized to determine associations between freshwater fishes and forested areas. Here, we determined the spatial...
Article
Ecological interactions among multiple invaders can aggravate their effects on invaded systems. Many salmonids including rainbow trout Oncorhynchus mykiss and Chinook salmon O. tshawytscha have established naturalized populations and co-occur in rivers worldwide. Predation of eggs and juveniles has been well documented among salmonids in their nati...
Article
Full-text available
Abstract Complex predator–prey interactions over time have the potential to limit survival of threatened native species. Reservoirs created by large dams in temperate ecosystems are sites where both coldwater and warmwater fish species overlap in distributions, forming assemblages that would not occur under natural settings. For example, in many we...
Article
The inclusion of diverse individuals in ecological sciences has shown little progress over the past 2 decades for various reasons, including structural barriers in societies, organizations, and academia. Collaboration networks are important for productivity, promotion, and scientific impact, yet the extent to which the structure of these networks a...
Article
Full-text available
Environmental DNA (eDNA) detection of aquatic invasive species is currently at the forefront of aquatic conservation efforts because the methodology provides a cost effective and sensitive means to detect animals at low densities. Developments in eDNA technologies have improved detection probabilities for rare, indicator, and invasive species over...
Preprint
Despite significant investments in watershed-scale restoration projects, evaluation and documentation of their impacts is often limited by inadequate experimental design. This project aimed to strengthen study designs by quantifying and elucidating sources of error in paired-watershed experiments and evaluating the statistical tools that detect and...
Article
Full-text available
Freshwater inputs strongly influence oceanographic conditions in coastal systems of northwestern Patagonia (41–45ºS). Nevertheless, the influence of freshwater on these systems has weakened in recent decades due to a marked decrease in precipitation. Here we evaluate potential influences of climate and land cover trends on the Puelo River (640 m3s−...
Article
Full-text available
Forests are integral to sustaining clean water resources and healthy watersheds. It is critical, therefore, that managers fully understand the potential impacts of their actions on myriad ecosystem services provided by forested watersheds. While forest hydrologists have long used paired-watershed experiments to elucidate the complex interactions be...
Conference Paper
Full-text available
Los escapes de salmónidos ocurren en ambientes heterogéneos, influenciando la sobrevivencia y éxito de peces fugitivos y el carácter de sus impactos (e.g., sanitarios, ecológicos, sociales). Escapes en proximidad a ambientes idóneos para la reproducción podrían tener mayores riesgos de sustentar establecimientos de nuevas especies y poblaciones, o...
Article
Full-text available
Traditional methods to measure body lengths of aquatic vertebrates rely on anesthetics, and extended handling times. These procedures can increase stress, potentially affecting the animal's welfare after its release. We developed a simple procedure using digital images to estimate body lengths of coastal cutthroat trout (Oncorhynchus clarkii clarki...
Article
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A common goal of biological adaptation planning is to identify and prioritize locations that remain suitably cool during the summer. This implicitly devalues areas that are ephemerally warm, even if they are suitable most of the year for mobile animals. Here we develop an alternative conceptual framework, the growth regime, which considers seasonal...
Article
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Food webs show the architecture of trophic relationships, revealing the biodiversity and species interactions in an ecosystem. Understanding which factors modulate the structure of food webs offers us the ability to predict how they will change when influential factors are altered. To date, most of the research about food webs has focused on specie...
Article
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The management of species that occur in low densities is a conservation concern worldwide across taxa with consequences for managers and policymakers. The distribution boundary at the upper extent of fish in North America receives extra attention because stream reaches with fish are managed differently and often have more protections than fishless...
Article
The literature on global trends in recreational fishing, the determinants of participation in recreational fishing, and the social embedding of recreational fishing in the public eye are reviewed across the world. Data support a conceptual life-cycle model of fisheries according to which interest in recreational fishing rises rapidly with economic...
Article
Full-text available
Species introductions threaten ecosystem function worldwide, and interactions among introduced species may amplify their impacts. Effects of multiple invasions are still poorly studied, and often, the mechanisms underlying potential interactions among invaders are unknown. Despite being a remote and well-conserved area, the southern portion of Sout...
Article
Biological invasions threaten species and ecosystems worldwide. Impacts from invasions are especially prevalent in freshwaters, where managers have struggled to contain the problem. Conventional approaches to managing invaders focus on prevention and control. In practice, these measures have proven to be variably effective. Control or eradication o...
Article
Recognizing some of the women who have contributed to fisheries science and the American Fisheries Society.
Article
Salmincola californiensis is a Lernaeopodid copepod parasitizing Pacific salmon and trout of the genus Oncorhynchus. Salmincola californiensis is of increasing concern in both native and introduced ranges because of its potential fish health impacts and high infection prevalence and intensity in some systems. Discrepancies in the documented life hi...
Article
Discussions about diversity, equity, and inclusivity are becoming increasingly common in scientific societies. However, more concerted efforts are needed to recognize and challenge systemic discrimination to ensure scientists from marginalized groups can contribute to and benefit from scientific societies. Here, we evaluate efforts and opportunitie...
Article
Chinook salmon are widely distributed across the globe with native stocks in the North Pacific Ocean and self-sustained populations in both the Northern and Southern Hemispheres. In their native range, Chinook salmon face many conservation and management challenges including depleted stocks, loss of genetic diversity, and hatchery influences, where...
Article
Fluctuating asymmetry is the non-directional deviations from bilateral symmetry and occurs across organisms. Fish otoliths are often used to test for differences in symmetry as otoliths aid in hearing, homing, and balance. Here, we evaluated the symmetry of otolith pairs in adult Chinook Salmon between wild and hatchery-origin stocks. Pacific salmo...
Article
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Data scarcity impedes a comprehensive impact assessment of the 38 dams currently proposed within the highly biodiverse central African nation of Gabon. Here, we present a multiple‐species MaxEnt distribution modeling approach to assess species richness for freshwater fishes at the landscape level and demonstrate its utility in identifying proposed...
Article
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The planned construction of 38 hydropower dams will impact the fish species inhabiting freshwater ecosystems in the megadiverse African country of Gabon. Many of Gabon's most culturally and economically important fish species are marine‐associated, moving between fresh and salt or brackish waters. However, we know little about their life histories...
Article
Natural history collections provide a wealth of information beyond the scope of their initial purpose, including a historical window into host–parasite relationships. For example, collections can reveal historical infections of fishes by the freshwater gill‐maggot Salmincola californiensis, a parasite of increasing concern because of negative effec...
Article
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The importance of zooplankton as a food resource for higher trophic levels, including threatened and endangered salmon species, highlights the need to improve our understanding of the mechanisms that structure reservoir food webs. Pelagic plankton are the dominant primary and secondary producers in reservoirs experiencing extreme water level fluctu...
Article
Linked foraging and bioenergetics models allow for increased understanding of fish growth potential and behavior by incorporating prey availability coupled to environmental conditions including temperature and prey visibility. To inform our understanding of growth and vertical migration patterns of Chinook Salmon inhabiting lentic ecosystems, we li...
Presentation
These are the Abstracts of the 2019 annual meeting of SNVB, WA TWS, and NW PARC. I have two abstracts in this compilation: Olson et al., Density Management and Riparian Buffer Study update, pp 154-155; Weil and Olson, NW PARC update, pp 162-163.
Article
Changes in land-uses and cover are strong drivers of stream degradation worldwide. In Mediterranean ecoregions, land conversion from forest with native species to tree plantations, agricultural, and urban areas have drastically increased in recent years. Here, we examined the influence of land-use types on water quality (physical and chemical varia...
Article
Full-text available
Fish passage out of reservoirs is a critical issue for downstream movement of juvenile salmonids and other migratory species. Reservoirs can delay downstream migrations by juvenile salmon for months or years. Here, we examine whether a novel management activity implementing annual short‐term draining of a reservoir to streambed improves timely down...
Article
Full-text available
Wetlands in arid landscapes provide critical habitat for millions of migratory waterbirds across the world and throughout their annual cycle. the scope and scale of understanding avian use of these wetlands in conjunction with changes in climate are daunting yet critical to address lest we lose continent-wide migratory pathways. Here, we assess cha...
Article
Temperature is a fundamental driver of aquatic environments. Changes in thermal regimes due to timber harvest may be detrimental for cold-water instream biota. Although it is understood that stream temperature may increase immediately below timber harvest operations, the understanding of how thermal responses propagate downstream is less clear. Her...
Article
Full-text available
Large dams and their respective reservoirs provide renewable energy and water security, but also can profoundly alter riverine ecosystems. Here, we present evidence of changing aquatic food web structure in the seasons following short-duration, extreme manipulation of water levels in a reservoir (i.e., draining of the reservoir to the original rive...
Data
One-way ANOVA—Tukey multiple pairwise-comparisons for d15N signatures. (DOCX)
Data
Largemouth Bass Gut content sampling. (DOCX)
Data
Summer light extinction coefficients from study reservoirs. (DOCX)
Data
Fish community structure in study reservoirs. (DOCX)
Data
Macroinvertebrate and Cladoceran densities in Fall Creek, Hills Creek and Lookout point reservoirs. (DOCX)
Article
Full-text available
• Globally, river systems have been extensively modified through alterations in riverscapes and flow regimes, reducing their capacity to absorb geophysical and environmental changes. • In western North America and elsewhere, alterations in natural flow regimes and swimways through dams, levees, and floodplain development, work in concert with fire...
Article
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Determining the ecological roles that fishes play in the complex trophic relationships of coral reef systems depends on our ability to detect changes in the fish community composition and function. The functional redundancy of fishes in different habitats is highly influenced by species composition and ontogenetic shifts in diets and feeding behavi...