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Articles 151 - 180 of 1020

Full-Text Articles in Ecology and Evolutionary Biology

Have Rusty Crayfish Affected The Diets Of Yellow Perch?, Matthew D. Kvam Jan 2023

Have Rusty Crayfish Affected The Diets Of Yellow Perch?, Matthew D. Kvam

Journal of Earth and Life Science

Freshwater ecosystems are some of the most susceptible to invasive species. It is one of the reasons they face the highest levels of species endangerment. Rusty crayfish Faxonius rusticus are one such invasive species, they fragment food webs and negatively affect native species. However, it seems as though native species are beginning to rely on them as a source of food. Yellow perch Perca flavescens, an important forage and game species, is one such species that is highly affected by these invasions. At smaller sizes yellow perch primarily feed on invertebrates whose populations are degraded by rusty crayfish. Therefore, the …

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Comparing Fish Species Assemblage Between Impacted And Restored Estuarine Salt Marshes Within The Eel River Estuary, Humboldt Co. Ca, Adam Aguilar, Isaac Basham-Clair, Tristan F. Parkinson, Larkin C. Wells Jan 2023

Comparing Fish Species Assemblage Between Impacted And Restored Estuarine Salt Marshes Within The Eel River Estuary, Humboldt Co. Ca, Adam Aguilar, Isaac Basham-Clair, Tristan F. Parkinson, Larkin C. Wells

Undergraduate Scholarship

This report details a study assessing the fish assemblages of a recently restored estuarine salt marsh site, and a similar unrestored and impacted site along the Eel River estuary. These two sites are located within the Eel River (Wiya’t) estuary, roughly 10 miles west of the city of Fortuna, CA. This study was conducted during the months of September through October 2023. Data collection was done through seine net dragging at randomly selected sample points across both sites. Seine net hauls were recorded by species and species count, which were later computed using a diversity index to provide values representative …

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A Preliminary Assessment Of The Spawning Potential Ratio Of Five Target Species Of The Coastal Gillnet Fishery In Guyana And Suriname, Tomas Willems, Elford Liverpool, Michael Hiwat Jan 2023

A Preliminary Assessment Of The Spawning Potential Ratio Of Five Target Species Of The Coastal Gillnet Fishery In Guyana And Suriname, Tomas Willems, Elford Liverpool, Michael Hiwat

Gulf and Caribbean Research

Data—limited stock assessment methods have the potential to positively impact livelihoods of fishermen around the world by providing management recommendations that aim to optimize sustainable yields from fisheries. Some years ago, a novel length— based (LB) method was developed for the assessment of spawning potential ratio (SPR), a measure of the reproductive capacity of fish stocks. We applied the LB—SPR method to 5 important target species of the coastal gillnet fishery in Guyana and Suriname. Nebris microps (Smalleye Croaker; 32% SPR) and Macrodon ancylodon (King Weakfish; 34% SPR) had the highest spawning potential, but remained below the 40% target level …

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Quantifying Antarctic Krill Connectivity Across The West Antarctic Peninsula And Its Role In Large-Scale Pygoscelis Penguin Population Dynamics, Katherine L. Gallagher, Michael S. Dinniman, Heather J. Lynch Jan 2023

Quantifying Antarctic Krill Connectivity Across The West Antarctic Peninsula And Its Role In Large-Scale Pygoscelis Penguin Population Dynamics, Katherine L. Gallagher, Michael S. Dinniman, Heather J. Lynch

CCPO Publications

Antarctic krill (Euphausia superba) are considered a keystone species for higher trophic level predators along the West Antarctic Peninsula (WAP) during the austral summer. The connectivity of krill may play a critical role in predator biogeography, especially for central-place foragers such as the Pygoscelis spp. penguins that breed along the WAP during the austral summer. Antarctic krill are also heavily fished commercially; therefore, understanding population connectivity of krill is critical to effective management. Here, we used a physical ocean model to examine adult krill connectivity in this region using simulated krill with realistic diel vertical migration behaviors across …

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Integrating Human Dimensions In Decadal-Scale Prediction For Marine Social Ecological Systems: Lighting The Grey Zone, Jess Melbourne-Thomas, Desiree Tommasi, Marion Gehlen, Eugene J. Murphy, Jennifer Beckensteiner, Francisco Bravo, Tyler D. Eddy, Mibu Fischer, Elizabeth Fulton, Mayya Gogina, Eileen Hofmann, Maya Ito, Sara Mynott, Kelly Ortega-Cisneros, Anna N. Osiecka, Mark R. Payne, Romeo Saldívar-Lucio, Kim J.N. Scherrer Jan 2023

Integrating Human Dimensions In Decadal-Scale Prediction For Marine Social Ecological Systems: Lighting The Grey Zone, Jess Melbourne-Thomas, Desiree Tommasi, Marion Gehlen, Eugene J. Murphy, Jennifer Beckensteiner, Francisco Bravo, Tyler D. Eddy, Mibu Fischer, Elizabeth Fulton, Mayya Gogina, Eileen Hofmann, Maya Ito, Sara Mynott, Kelly Ortega-Cisneros, Anna N. Osiecka, Mark R. Payne, Romeo Saldívar-Lucio, Kim J.N. Scherrer

CCPO Publications

The dynamics of marine systems at decadal scales are notoriously hard to predict-hence references to this timescale as the "grey zone" for ocean prediction. Nevertheless, decadal-scale prediction is a rapidly developing field with an increasing number of applications to help guide ocean stewardship and sustainable use of marine environments. Such predictions can provide industry and managers with information more suited to support planning and management over strategic timeframes, as compared to seasonal forecasts or long-term (century-scale) predictions. The most significant advances in capability for decadal-scale prediction over recent years have been for ocean physics and biogeochemistry, with some notable advances …

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A Diet Comparison Of Bluegill And Bluegill X Pumpkinseed Hybrids, Russell D. Zwiers Jan 2023

A Diet Comparison Of Bluegill And Bluegill X Pumpkinseed Hybrids, Russell D. Zwiers

Journal of Earth and Life Science

Bluegill Lepomis macrochirus and pumpkinseed Lepomis gibbosus commonly prey upon macroinvertebrates but have been found to show different preferences to what type of macroinvertebrates. Hybrids of the two species have been found to display physical characteristics of both parents but prey selection of the hybrids compared to the parents is unknown. Therefore, the objective of this study was to analyze the diets of bluegill and bluegill x pumpkinseed hybrids to understand what each species’ preference is when it comes to food as well as finding how a hybrid’s diet compares to the pure breed of one of the two crossed …

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Effects Of Velocity And Substrate Size On The Formation Of Zebra Mussel Druses, Ian Mott Jan 2023

Effects Of Velocity And Substrate Size On The Formation Of Zebra Mussel Druses, Ian Mott

Journal of Earth and Life Science

Zebra Mussels Dreissena polymorpha are an invasive bivalve species that are highly successful at dominating new environments. These invaders have been known to colonize substrate so thoroughly that all they have to attach to are members of their own species. When large mats of interconnected mussels completely cover a riverbed, it can have a drastic effect on the surrounding environment. This study serves to create a better understanding of the hydrologic parameters needed for Zebra Mussels to create these ecosystem-transforming colonies known as druses. Data was collected on a small stretch of the Upper Mississippi River in Northern Minnesota, previously …

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Estimate Of Long-Term Phytoplankton Biomass In Lake Bemidji, William J. Peterson Jan 2023

Estimate Of Long-Term Phytoplankton Biomass In Lake Bemidji, William J. Peterson

Journal of Earth and Life Science

Phytoplankton are photosynthetic organisms that are the base of aquatic food webs. In a dimictic temperate lake such as Lake Bemidji, the environment adjusts with the changing water temperatures and sunlight levels. The phytoplankton in a dimictic lake are adapted to subsist in long term seasonal changes but the exact change to the number of phytoplankton in unknown. The focus of this study was to estimate the biomass of phytoplankton in a long term period including winter stratification and summer peak. From a period between March 2023 and October 2023 water samples were collected from the lake in the south …

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Diets Of Invasive Channel Catfish Are Subsidized By Invasive Riparian Trees, Christopher A. Cheek, Brandon K. Peoples, Reuben R. Goforth Jan 2023

Diets Of Invasive Channel Catfish Are Subsidized By Invasive Riparian Trees, Christopher A. Cheek, Brandon K. Peoples, Reuben R. Goforth

Natural Resource Management Faculty Publications

Russian olive (Elaeagnus angustifolia) is an invasive, fruit- bearing riparian tree that dominates riparian zones of the San Juan River in the southwestern United States. Previous research in this river suggests olive fruit is common in diets of invasive channel catfish (Ictalurus punctatus), but its energetic importance is unknown (i.e. critical for catfish fitness vs. incidental consumption). We assessed Russian olive consumption in channel catfish diets bimonthly for 1 year, hypothesizing that olive consumption would be greatest during periods of high olive availability and low benthic aquatic invertebrate availability. We found that catfish consumed olive fruit throughout the year and …

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Effects Of Oyster Aquaculture On Elasmobranch Abundance And Habitat Use In Humboldt Bay, Ca, Rose Harman Jan 2023

Effects Of Oyster Aquaculture On Elasmobranch Abundance And Habitat Use In Humboldt Bay, Ca, Rose Harman

Cal Poly Humboldt theses and projects

Habitat modification from aquaculture can have large effects on natural communities, with the habitat complexity provided by aquaculture structure positively influencing benthic invertebrates and small fish abundance. However, the effects of aquaculture on larger predatory fish like elasmobranchs (i.e., sharks and rays), which use nearshore habitat to forage and provide top-down control of these ecosystems, is largely unknown. Over two years, I deployed baited remote underwater video systems (BRUVS) to examine the effects of oyster aquaculture and environmental variables such as habitat (mudflat or eelgrass), salinity (ppt), turbidity (m), temperature (°C), pH (mV), dissolved oxygen (mg · L-1), …

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Measuring The Production Of Migratory Westslope Cutthroat Trout In Tributaries To Priest River, Idaho, Collin J. Hendricks Jan 2023

Measuring The Production Of Migratory Westslope Cutthroat Trout In Tributaries To Priest River, Idaho, Collin J. Hendricks

EWU Masters Thesis Collection

Iteroparous salmonids that exhibit a migratory life history are essential to functioning metapopulations. They are demographically important as migratory females produce more eggs than non-migratory individuals. Additionally, they provide genetic support through gene flow, resulting in more robust, genetically diverse populations. The lower Priest River flows into the Pend Oreille River in the panhandle of northern Idaho and is a system susceptible to degrading conditions due to increasing water temperature. It is also, a significant contributor of migratory Westslope Cutthroat Trout Oncorhynchus clarkii lewisi (WCT) in the Clark- Fork Pend Oreille Basin (CFPOR). The goal of our study was to …

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Length-Weight Relationships Of The Bream Abramis Brama (Linnaeus, 1758) In Beni- Haroun Dam Of Mila City (North-East Of Algeria), Tolba Mounia, Hadjab Ramzi, Chikara Bouziani Mohamed, Berrouk Houda, Kaouachi Nouha Dec 2022

Length-Weight Relationships Of The Bream Abramis Brama (Linnaeus, 1758) In Beni- Haroun Dam Of Mila City (North-East Of Algeria), Tolba Mounia, Hadjab Ramzi, Chikara Bouziani Mohamed, Berrouk Houda, Kaouachi Nouha

Journal of Bioresource Management

The study of fish growth is a valuable tool in providing good understanding on the general biology and growth of fish populations, in addition to the comparison of the same fish species populations living in remote geographic areas. Thus, the present work was designed to study the age and growth of Abramis brama species newly introduced in Beni-Haroun dam (Mila department, Northeast Algeria). Here, the study was conducted on sampling of 141 individuals from July 2015 to October 2016. The age of fishes was determined according to scalimetric method, since the fish sex was determined by macroscopic method, showing that …

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Phytoplankton Community Of Boalia Khal Tributary Of The Halda River, Chattogram, Bangladesh, Md. Shafiqul Islam, M.A. Azadi, Munira Nasiruddin Dec 2022

Phytoplankton Community Of Boalia Khal Tributary Of The Halda River, Chattogram, Bangladesh, Md. Shafiqul Islam, M.A. Azadi, Munira Nasiruddin

Journal of Bioresource Management

Boalia Khal is one of the important tributaries of the River Halda. The productivity of the Boalia Khal tributary of the Halda River mainly depends on the phytoplankton diversity. A study was conducted for two years period from January 2017 to December 2018 to identify the phytoplankton community of the Boalia Khal tributary. A total of 61 species of phytoplankton under 37 genera belonging to 8 classes were recorded. The dominant group of phytoplankton was 25 species of Diatoms (40.98 %) followed by 18 species of Green Algae (29.5 %), 9 species of Euglenophytes (14.75 %), 7 species of Blue …

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Assessing The Legacy Of Erosion And Flood Control Management Efforts On The Fish Assemblages And Physical Conditions Of Yazoo Basin Bluff Hill Streams, Nicky M. Faucheux Dec 2022

Assessing The Legacy Of Erosion And Flood Control Management Efforts On The Fish Assemblages And Physical Conditions Of Yazoo Basin Bluff Hill Streams, Nicky M. Faucheux

Theses and Dissertations

The hills of Yazoo Basin have a long history of land use modification and subsequent erosion and flood control issues. In response, federal actions were taken to address these issues beginning after the Mississippi River flood of 1927. Four major flood control reservoirs were built in 1932-1957, and instream low-drop grade control structures (GCS) were installed beginning in the 1980s. The objective of my dissertation was to ascertain the long-term effects of these efforts on stream fish assemblages and channel morphology. To assess whether the reservoirs affected upstream fish assemblages as barriers to recolonization by fluvial fishes or as source …

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Crustacean Assemblage Structure Over The Charlie-Gibbs Fracture Zone Of The Mid-Atlantic Ridge Collected During The 2009 Henry B. Bigelow Expedition, Kathryn Medina Dec 2022

Crustacean Assemblage Structure Over The Charlie-Gibbs Fracture Zone Of The Mid-Atlantic Ridge Collected During The 2009 Henry B. Bigelow Expedition, Kathryn Medina

All HCAS Student Capstones, Theses, and Dissertations

The Charlie Gibbs Fracture Zone (CGFZ) consists of two nearly parallel fracture transform faults that intersect the Mid-Atlantic Ridge (MAR) axis. This area has high primary productivity and biomass levels due to the topography and water. A predominant hydrographic feature of the MAR is the Sub-Polar Front (SPF) which runs along the southern edge of the CGFZ and is known as a biogeographical boundary for multiple species. As part of The Census of Marine Life project Patterns and Processes of the Ecosystem of the northern Mid-Atlantic (MAR-ECO), this study analyzed the abundance and distribution patterns of the CGFZ crustacean community …

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Aquaculture In Africa: Aquatic Animal Welfare, Impact On The Environment And The Sustainability Of The Sector, Mwenda M. Mbaka, Janice H. Cox, Stephen Ronan Dec 2022

Aquaculture In Africa: Aquatic Animal Welfare, Impact On The Environment And The Sustainability Of The Sector, Mwenda M. Mbaka, Janice H. Cox, Stephen Ronan

Aquaculture

The African aquaculture sector recorded the fastest growth in the world between 2006-2018, averaging 10% or more, and is expected to partially fill the growing fish supply-demand gap up to 2063. In 2018, there were about 1.2 million aquafarmers across the continent, an increase from 920 thousand in 2014. According to the African Development Bank, expansion of aquaculture in Africa is hampered by "the overwhelming predominance of tilapia farming, which relies heavily on the production of fingerlings from a limited number of genetically improved strains that are resistant to the many diseases affecting this species, and on the production of …

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Environmental Influences On The Growth Of Inland Cisco Populations In Three Minnesota Sentinel Lakes, Edward Carlson Dec 2022

Environmental Influences On The Growth Of Inland Cisco Populations In Three Minnesota Sentinel Lakes, Edward Carlson

Biology Graduate Theses

Cisco Coregonus artedi are a pelagic cold-water fish that are widely distributed throughout many inland lakes across the northern Midwest and play an important role as forage for large piscivores. Inland Cisco populations have been observed to vary in their overall size and recruitment potential based on the system in which they are found. Cisco are sensitive to oxythermal stress and with climate change, land use, and invasive species effects becoming more prevalent in Minnesota, aspects of lake ecosystems are changing, ultimately making Cisco more susceptible to these stressors. To investigate how different factors were affecting the population dynamics of …

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Patterns Of Occurrence Of The Black Basses In The Upper Savannah River Tributaries Of Georgia And South Carolina With Emphasis On Bartram’S Bass Micropterus Sp. Cf. Coosae, Caroline Cox Dec 2022

Patterns Of Occurrence Of The Black Basses In The Upper Savannah River Tributaries Of Georgia And South Carolina With Emphasis On Bartram’S Bass Micropterus Sp. Cf. Coosae, Caroline Cox

All Theses

Aquatic ecosystems are among the most threatened in the world due to anthropogenic alterations to the natural landscape and native biotas. Identifying the local and landscape-level environmental factors that influence the occurrence of endemic species can help protect aquatic ecosystems by facilitating predictions of where hybridization or replacement with generalist species may occur across the landscape. The need for such predictions is pronounced for black bass species in the southeastern United States. Bartram’s Bass (Micropterus sp. cf. coosae) is a provisional species of conservation concern. Allelic frequencies of Bartram’s Bass in Savannah River reservoirs and tributaries have been …

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The Impacts Of A Quagga And Zebra Mussel Infestation, Casey Silva Dec 2022

The Impacts Of A Quagga And Zebra Mussel Infestation, Casey Silva

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Invasive species issues have been on the rise in the United States for decades. These organisms can disrupt the natural flow of an ecosystem and overtake native species, altering an environment as a whole. The introduction of the zebra mussel (Dreissena polymorpha) in 1988, followed by the quagga mussel (Dreissena rostriformis) in 1989 is arguably the most prolific aquatic infestation the nation is currently up against (Hoddle, 2022). Beginning in the Great Lakes, both quagga and zebra mussels quickly spread their infestations through the Midwest and the East coast. The potential invasion of these species across …

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Characterizing Habitat Suitability For Gulf Sturgeon (Acipenser Oxyrinchus Desotoi) In Southern Louisiana, Jenna N. Brogdon Aug 2022

Characterizing Habitat Suitability For Gulf Sturgeon (Acipenser Oxyrinchus Desotoi) In Southern Louisiana, Jenna N. Brogdon

LSU Master's Theses

A generalized additive modeling (GAM) framework was used to characterize fish-habitat relationships and develop habitat suitability maps to predict spatiotemporal and ontogenetic shifts in Gulf sturgeon distribution within an impacted estuary in the northern Gulf of Mexico, Lake Pontchartrain. Gulf sturgeon (n = 103) were fitted with acoustic transmitters in the Pearl River during the early summer and fall from 2013 to 2018, and an array of acoustic receivers (n = 81) was used to monitor Gulf sturgeon habitat use and movement in the estuary from 2016 to 2019. Daily presence data from the telemetry array were paired with environmental …

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Enzootic Trends Of Crassostrea Virginica And Perkinsus Marinus In North Inlet Estuary, South Carolina, Nico Martin D'Amico May 2022

Enzootic Trends Of Crassostrea Virginica And Perkinsus Marinus In North Inlet Estuary, South Carolina, Nico Martin D'Amico

Electronic Theses and Dissertations

The Eastern oyster (Crassostrea virginica) co-occurs with the protozoan parasite Perkinsus marinus (the causative agent for "Dermo") in US Atlantic and Gulf of Mexico estuaries. Oyster host functions as an ecological engineer and agent for benthic-pelagic coupling are compromised when P. marinus infections are common in populations (prevalence) and high in individuals (intensity). P. marinus infections in oysters from North Inlet estuary, South Carolina were quantified in relation to shell height (60-76 mm, ≥76 mm), sex (functional female, male, indeterminate), water temperature, and salinity. Three fringing reefs on a longitudinal transect from the inlet mouth into the watershed were sampled …

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Trophish: Building A Global Database Of Freshwater Trophic Interactions, Jacob M. Ridgway May 2022

Trophish: Building A Global Database Of Freshwater Trophic Interactions, Jacob M. Ridgway

Honors Thesis

Freshwater management and research frequently use the trophic data of freshwater fishes. Despite this fact, it is difficult to perform a simple search of dietary information for any one fish species. FishBase represents, to our knowledge, the largest compilation of freshwater dietary information to date. However, it excludes a large portion of the ecological literature due to its development taking place prior to the creation of most modern scientific search engines. Our project (TroPhish) is building upon FishBase by digitizing approximately 130 years of data from the fish predation literature. Data from the primary and grey (e.g. theses, dissertations, reports) …

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A Genetic Evaluation Of The Impacts Of Dams On Sauger Movement Patterns In The Arkansas River, Emily R. Jonagan May 2022

A Genetic Evaluation Of The Impacts Of Dams On Sauger Movement Patterns In The Arkansas River, Emily R. Jonagan

ATU Theses and Dissertations 2021 - Present

Decreased habitat connectivity as a result of damming can lead to genetic isolation in fish communities, especially in highly migratory species. Sauger Sander canadensis is a migratory freshwater species native to the Arkansas River. Sauger are highly sought after by anglers during their annual spawning migration in late winter. In order to investigate the impacts Arkansas River dams on Sauger populations, fin clips were collected in the winters of 2019, 2020, and 2021 below eight dams in the McClellan-Kerr Arkansas River Navigational System (MKARNS). Fin clips were also collected from two reservoirs in Kansas to serve as distinct reference populations. …

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Striped Blenny (Chasmodes Bosquianus) Behavior And Shelter Use In A Southeastern Salt Marsh Tidal Creek, Brooklyn Johnson, Juliana Harding May 2022

Striped Blenny (Chasmodes Bosquianus) Behavior And Shelter Use In A Southeastern Salt Marsh Tidal Creek, Brooklyn Johnson, Juliana Harding

Honors Theses

Temperate estuaries are important habitats for resident species and maturing juvenile transient fishes. The North Inlet estuary, SC resident fish fauna includes the Striped Blenny (Chasmodes bosquianus) and Crested Blenny (Hypleurochilus geminatus). Individual blenny males occupy habitat shelters year-round. During breeding season, blenny males attract mates to nest and protect developing embryos within the nest. Salinity requirements establish blenny spatial distribution in the estuary. Seasonal spawning activity by these temperate blenny species is related to water temperature and seasonal productivity patterns. Blenny nest site occupancy patterns relative to the lunar cycle, water depth, and salinity were …

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Accumulation Of Persistent Organic Pollutants In Marine Mammals: A Case Study On Cetaceans, Pinnipeds, And Sirenians, Alydia Moorhead Apr 2022

Accumulation Of Persistent Organic Pollutants In Marine Mammals: A Case Study On Cetaceans, Pinnipeds, And Sirenians, Alydia Moorhead

All HCAS Student Capstones, Theses, and Dissertations

Persistent organic pollutants (POPs) are lipophilic semi-volatile organic chemicals that present a range of challenges to marine biota, specifically marine mammals that often occupy a high trophic position in the food web. POPs have become a global problem since they have been shown to cause immunologic, teratogenic, carcinogenic, neurological, and reproductive complications in living organisms due to their resistance to biodegradation and their lipophilic nature. Marine mammals can accumulate these toxic substances through direct ingestion, trophic transfer, adsorption, and maternal offloading. They are susceptible to both bioaccumulation and biomagnification of POPs. Accumulation of POPs is affected by many variables, including …

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An Assessment Of Burbot Life History In Minnesota With A Focus On Movement Dynamics And Spawning Vulnerability, Tyler Robinson Apr 2022

An Assessment Of Burbot Life History In Minnesota With A Focus On Movement Dynamics And Spawning Vulnerability, Tyler Robinson

Biology Graduate Theses

Burbot have a circumpolar range spanning from rivers of Alaska to lentic systems in Minnesota. Although Burbot population dynamics have been studied, their movement dynamics have been rarely investigated. Our objectives were to assess seasonal home range changes of Burbot in a closed-lentic system and quantify the scale of spawning aggregations. Sixty-six Burbot were implanted with acoustic transmitters in Bad Medicine Lake, Minnesota, with 32 surviving the length of the study period between 10 April 2019 to 11 June 2020. The peak spawning date for Burbot in Bad Medicine Lake was estimated to be mid-March, when home range estimates were …

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Larval Fish Abundance In The Benthic And Surface Drift Of The Missouri River, Ryan L. Ruskamp Apr 2022

Larval Fish Abundance In The Benthic And Surface Drift Of The Missouri River, Ryan L. Ruskamp

Department of Agricultural Leadership, Education, and Communication: Dissertations, Theses, and Student Research

Knowledge of the larval fish community of the Missouri River is one of the biggest gaps in fisheries research. The Nebraska Game and Parks Commission has sampled the drift of the Missouri River for many years (1983-2015), but these data have not been compiled into a unified assessment. Therefore, the objectives of this study were to: 1) quantify temporal and spatial aspects of larval fish community composition (richness) and structure (abundance) of the surface drift, 2) quantify associations of larval fish communities of the drift to different discharges of the Missouri River, 3) quantify the larval benthic drift community, and …

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Estimating Fish Diet In Lake Turkana, Kenya, Julia G. Sharapi Apr 2022

Estimating Fish Diet In Lake Turkana, Kenya, Julia G. Sharapi

Student Publications

Lake Turkana, located in northern Kenya on the Ethiopian border, is the world’s largest permanent desert lake. Over 90% of its flow originates from the Omo River in Ethiopia, which causes the lake to have seasonal rises and falls in water level. The Omo River has been subject to the construction of five dams (the Gilgel Gibe dams) and several irrigation projects. These developments will impact the amount of water entering the lake, with implications for lake chemistry and productivity, littoral habitat availability, and the breeding biology of the lake’s fishes. Though ongoing upstream changes are likely to have serious …

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3d Library From Body Size From Unconventional Specimens: A 3d Geometric Morphometrics Approach To Fishes From Ancestral Pueblo Contexts, Jonathan Dombrosky, Thomas F. Turner, Alexandra Harris, Emily Lena Jones Apr 2022

3d Library From Body Size From Unconventional Specimens: A 3d Geometric Morphometrics Approach To Fishes From Ancestral Pueblo Contexts, Jonathan Dombrosky, Thomas F. Turner, Alexandra Harris, Emily Lena Jones

Anthropology Faculty & Staff Publications

Animal body size estimation from zooarchaeological specimens often relies on specific, one-dimensional (i.e., conventional) measures from skeletal elements. Here, we introduce an animal body size estimation technique for archaeological fishes that relies on 3D reference scans and the calculation of centroid size, a standard 3D geometric morphometric proxy measure for organism size. Centroid size-based estimations on whole caudal vertebrae are strongly correlated with a widely accepted measure (i.e., centrum width), but the scalability and flexibility of the centroid size-based approach allows for use on a wide variety of fragmented remains. We use zooarchaeological fish remains (subfamily Ictiobinae) from late pre-Hispanic …

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The Role Of Leaf Decomposition In Macroinvertebrate Colonization, Bethany Mabel Lian Schorr, Kevin Geedey Mar 2022

The Role Of Leaf Decomposition In Macroinvertebrate Colonization, Bethany Mabel Lian Schorr, Kevin Geedey

Independent Research Projects

Decomposition plays an important ecological role in carbon and nutrient cycling that supply food and energy resources to food webs. This study investigates the potential role that leaf decomposition of different leaf species may play in macroinvertebrate assemblages in upper Midwest streams. We hypothesized that the different decomposition rates experienced with different leaf species and in different streams would have an effect on invertebrate colonization due to the variance in nutrient availability. Due to altered fire regimes and other influences, forests are experiencing declines in fire-adapted, heliophytic species such as oaks and compositional shifts toward shade-tolerant, mesophytic species such as …

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