✎✎✎ Female Darkblotched Rockfish: A Literature Review

Wednesday, October 27, 2021 8:11:03 PM

Female Darkblotched Rockfish: A Literature Review

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Fishery Bulletin. Catches in ghost-fishing octopus and fish traps in the northeastern Atlantic Ocean Algarve, Portugal. Analysis of sex-specific spawning biomass per recruit of the sailfish Istiophorus platypterus in the waters off eastern Taiwan. Annual and batch fecundities of yellowfin sole, Limanda aspera, in the eastern Bering Sea. Indirect estimates of natural mortality rate for arrowtooth flounder Atheresthes stomias and darkblotched rockfish Sebastes crameri. Changes over time in the spatial distribution of walleye pollock Theragra chalcogramma in the Gulf of Alaska, Food habits of Florida red tilapia fry in manured seawater pools. In: Pullin, R. T54 I59 Guary, J. Routes of plutonium uptake and their relation to biomagnification in starfish.

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Revista Chilena De Historia Natural. Halpin, Patricia M. Patterns of variation in levels of Hsp70 in natural rocky shore populations from microscales to mesoscales. Integrative and Comparative Biology. A57, Guin QL1. Hamann, Ilse M. Effects of steep topography on the flow and stratification near Palmyra Atoll. Ocean Dynamics. D4, also Electronic Subscription.

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Differences in pathogenicity and pathology of Vibrio anguillarum and Vibrio ordalii in chum salmon Oncorhynchus keta and English sole Parophrys vetulus under laboratory conditions. Host parasite relationships between G yrodactylus stellatus and the English sole Parophrys vetulus. Hanna, Susan S. Book Review of: Oyster wars and the public trust: property, law and ecology in New Jersey history. McCay, B. Ecological Economics. E5 E Economic social science and ecosystem-based management [In]Impact Assessment, Inc. Call Number: Available electronically. The economics of co-management. Wilson, D. Dordrecht, The Netherlands: Kluwer Academic; ; pp. C57 F57 The economics of fishery management: behavioral incentives and management costs.

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June 12—14, ; Stockholm, Sweden. Managing the human and ecological interface: marine resources as example and laboratory. E, pdf. More than meets the eye: the transaction costs of litigation. Ocean and Coastal Law Journal. NFCC consensus statement on integating marine reserve science and fisheries management. Call Number: Digital Open Access,. Property rights and biodiversity.

Levin, Simon A. Encyclopedia of Biodiversity. B56 E Setting the fishery management stage: evolution of West Coast groundfish management [electronic resource]. Tradition and globalization: common property in theory and practice: the example of biodiversity protection in fisheries. Transition in the American fishing commons: management problems and institutional design challenges. Dolsak, N. Will structural reform fix fishery management? Commission policy recommendations and the U. Washington, D. F59 , Guin SH F59 c. Change and Resilience in Fishing. F U61 , Guin HD F U61 c. Jackson Foundation. Designing institutions for Columbia River salmon: identifying the key uncertainties.

In: Koss, P. Portland, Oregon: Portland State University; S2 P68 Attitudes of trawl vessel captains about work, resource use, and fishery management. North American Journal of Fisheries Management. N62; Guin SH Hannach, G. Photoinduction of UV-absorbing compounds in six species of marine phytoplankton. Hannah, Robert W. O7 O75 no. Influence of environmental variation and spawning stock levels on recruitment of Ocean Shrimp Pandalus jordani. Spatial changes in trawl fishing effort in response to foot rope diameter restrictions in the U.

West Coast bottom trawl fishery. N62, Guin SH Variation in geographic stock area, catchability, and natural mortality of ocean shrimp Pandalus jordani : some new evidence for a trophic interaction with Pacific hake Merluccius productus. Effectiveness of selective flatfish trawls in the U. Information reports Oregon. Fish Division ; O7 no. Bycatch reduction in an ocean shrimp P andalus jordani trawl from a simple modification to the trawl footrope. Journal of Northwest Atlantic Fishery Science. J6, also Electronic Subscription.

Effectiveness of bycatch reduction devices BRDs in the ocean shrimp Pandalus jordani trawl fishery. F, also Electronic Subscription. Fishery-induced changes in the population structure of pink shrimp Pandalus jordani. Measuring the height of the fishing line and its effect on shrimp catch and bycatch in an ocean shrimp. O7 H Fecundity of the ocean shrimp Pandalus jordani. Fish Division. O7 O75 No. Behavior of nine species of Pacific rockfish after hook-and-line capture, recompression, and release.

A5, also Electronic Subscription. Age-modulated variation in reporductive development of female Pacific ocean perch Sebaster alutus in waters off Oregon. Alaska Sea Grant College Program report. Evaluation of a selective flatfish trawl and diel variation in rockfish catchability as bycatch reduction tools in the deepwater complex fishery off the US West coast. N62, also Electronic Subscription. Length and age at maturity of female petrale sole Eopsetta jordani determined from samples collected prior to spawning aggregation.

Escaping the surface: the effect of capture depth on submergence success of surface-released Pacific rockfish. Weight change of pink shrimp Pandalus jordani , after commercial harvest and handling. Hansen, Andrew J. Ecotones: what and why? Biology International. N Ecotones in a changing environment: the theory and management of landscape boundaries. Responses of vertebrates to stand and edge type in managed forests of the Oregon Coast Range. Northwest Environmental Journal.

A19 N Conserving biodiversity in managed forests. A13, Guin QH2. Responses of wildlife habitats to forest management and climate change: a modeling approach. Hansen, Gayle I. Book review of: Druehl, L. Journal of Phycology. Focal taxonomic collections: marine plants in Prince William Sound, Alaska. Hines, A. Josephine Tilden Garbary, D. Prominent Phycologists of the 20th Century. PSA in coastal Oregon - a re-cap. Phycological Newsletter. A revised checklist and preliminary assessment of the macrobenthic marine algae and seagrasses of Oregon.

In: Kaye, T. U5 O Seagrasses, Green, Red and Brown Algae. In: Uscian, J. Hanson, Alfred W. Life cycle and host specificity of Diclidophora sp. The symbiotic relationships and morphology of paravortex sp. Turbellaria, Rhabdocoelida , a parasite of macoma nasuta Conrad, Hare, M. A genetic test for recruitment enhancement in Chesapeake Bay oysters, Crassostrea virginica , after population supplementation with a disease tolerant strain.

Harmon, V. A 7-day toxicity test for marine pollutants using the Pacific mysid Mysidopsis intii. Protocol evaluation. Environmental Toxicology and Chemistry. A1 E, Guin QH A1 E Industry-scientist cooperative research : application to the West Coast groundfish fishery. Scientists, industry share more than they know. Pacific Fishing. A comparison of conservation perspectives between scientists, managers, and industry in the west coast groundfish fishery. The economics of cooperative fishery research: a survey of U.

Industry-scientist cooperative research : application to the West Coast groundfish fishery: a report submitted to Northwest Fisheries Science Center. Harrenstein, L. Evaluation of a point-of-care blood analyzer and determination of reference ranges for blood parameters in rockfish. Journal of the American Veterinary Medical Association. Hart, Roger and Peterson, C. Late-holocene buried forests on the Oregon coast. Earth Surface Processes and Landforms. ISSN: , Online. E21, Electronic Subscription. Hart, Roger A. Formation of an Archaean continent. Mantle plume noble gas component in glassy basalt from Reykjanes Ridge. Silica mobilization in marine hydrothermal systems: a total flux estimate.

In: Rodriguez-Clemente, R. Geochemistry and mineral formation in the Earth surface. Granada Spain. Hydrothermal sulfides, breccias and greenstones from the Gorda Depression. Diel activity patterns in demersal fishes on Heceta Bank, Oregon. Harte, M. Mann H. Developing underutilized fisheries: Oregon's developmental fisheries program. Marine Policy. M3, Electronic Subscription. Call Number: Contact Author. Hartman, G. Saying that logging is either "good" or "bad" for fish doesn't tell you how to manage the system. The Forestry Chronicle. Hartman, Michael C. The algal symbionts of the solitary green sea anemone Anthopleura xanthogrammica.

A green algal symbiont in Clinocardium nuttallii. Harvey, James T. Population dynamics, annual food consumption, movements, and dive behaviors of harbor seals, Phoca vitulina richardsi , in Oregon. Two sightings following release of rehabilitated harbor seals. The Murrelet. N6 M8, Guin QL N6 M8. Jones, M. The Gray Whale, Eschrichtius robustus. Academic Press; ; pp. C G73 , Guin QL C G73 The feasibility and effectiveness of using an acoustic barrier to restrict the movements of seals into Netarts Bay, Oregon. In: Mate, Bruce R. Oregon Sea Grant; P6 A21 , Guin QL P6 A21 The state of scientific information relating to the biology and ecology of the Gorda Ridge study area, northeast Pacific Ocean: neketon.

Open File Report. Report to the Salmon Industry Response Cabinet. Hauck, Arthur K. Infection, histopathology and migration of Anisakis sp. Hawkins, Dan L. Metabolic responses of the burrowing mud shrimp, Callianassa californiensis, to anoxic conditions. Haxel, Joseph H. The sediment response of a dissipative beach to variations in wave climate. Geophysical Research Letters. G37 Electronic subscription. Marine Geology. M3, pdf. Hayes, D. Reply: efficiency and bias of estimators and sampling designs for determining lenth-weight relationships of fish.

Hayes, John P. Arborimus longicaudus. Mammalian Species. M3, Internet Resources. Temporal variation in activity of bats and the design of echolocation-monitoring studies. Journal of Mammalogy. J6, Guin QL The influence of logging riparian areas on habitat use by bats in Western Oregon. In: Barclay, R. Bats and Forests Symposium; Victoria, B. Victoria, B. Working paper. The influence of logging riparian areas on habitat utilization by bats in Western Oregon. Bat Research News. A comparison of the effectiveness of sherman and modified fitch live-traps for capture of small mammals. Northwestern Naturalist.

Integrating research and forest management in riparian areas of the Oregon Coast Range. Western Journal of Applied Forestry. A new COPE study examining the influence of commercial thinning on wildlife habitat and diversity. COPE Report. R52 C, Guin QH R52 C The genetic diversity of native, stocked, and hybrid populations of brook trout Salvelinus fontinalis in the Southern Appalachians.

A1 C, Guin QH A1 C Systematic Biology. Spatial and temporal variation in bat activity in echolocation monitoring studies. Securing live traps to small diameter trees for studies of arboreal mammals. N6 M3, Guin QL N6 M3. Townsend's chipmunk populations in Douglas-fir plantations and mature forests in the Oregon Coast Range. Canadian Journal of Zoology. C23, Guin QL1. Field use of the Anabat II bat detector system to monitor bat activity. Bat activity in riparian areas off the Oregon Coast Range: a progress report. Clinal variation and morphology of woodrats Neotoma of the eastern United States. Statistical power analysis and amphibian population trends. Environmental fluctuation and cohort strength of Dover sole Microstomus pacificus and English sole Parophrys vetulus.

Hayslip, G. Environmental Protection Agency. Region Office of Environmental Assessment. Ecological Condition of the Estuaries of Oregon and Washington. Hayteas, D. Eleventh biennial conference on the biology of marine mammals; Orlando, Florida. C The use of high pressure process to shuck oyster, reduce microbial load and extend shelf-life. The use of high hydrostatic pressure to shuck oysters and extend shelf-life. Use of high pressure processing for oyster shucking and shelf-life extension. Journal of Food Science. F6, Guin TX F6, Guin Reprint File: Morrissey. Heath, G. Ocean studies supporting the assessment of deep sea disposal of defueled, decommissioned nuclear submarines. Environmental Geology and Water Sciences.

Hebert, A. Small-scale heterogeneity in the geochemistry of seagrass vegetated and non-vegetated estuarine sediments: causes and consequences. Aquatic Geochemistry. Hecht, Scott A. The sensitivity of an infaunal amphipod, Eohasutoris estuarius , to acute waterborne exposures of 4-nonylphenol: evidence of a toxic hangover. Influences of sedimentary organic matter quality on the bioaccumulation of 4-nonylphenol by estuarine amphipods.

Hedgecock, D. Applications of population genetics to conservation of chinook salmon diversity in the Central Valley. Fish Bulletin. C24, Guin SH C24, pdf. Genetic improvement of cultured Pacific oysters by selection. E55, Guin SH G Hedrick, R. Two cell lines from white sturgeon. Characteristics of a new reovirius from channel catfish Ictalurus punctatus. Journal of General Virology. Hedtke, J. Influence of body size and developmental stage of coho salmon, Oncorhynchus kisutch , on lethality of several toxicants. Fundamental and Applied Toxicology. F81, Guin RA Heide, Kathleen M.

Sound in the sea. Statewide telecommunications program in science education abstract. Oregon Science Teacher. Holidays are a natural time of introspection on who we are, what we do, and why. We hope you enjoy reading about us and learning even more about us. It is hopefully a soft bookend to a wild ! This is one of my favorite pictures because it captures the integrative and applied research and teaching we do at CWS. These students are part of the Ecogeomorphology field class, which brings together students from a range of science backgrounds to study and address conservation and management issues in watersheds in California and the Western US. From the foreground to the background, students are surveying channel topography, macroinvertebrate diversity, fish presence, and sediment texture on the Yampa River, a free-flowing unregulated river.

When compared to survey data collected on the Green River, a river regulated by dams, students see the impacts of streamflow regulation on riverine ecosystems and discuss how conservation management practices balance ecological and human resource needs. My research seeks to similarly integrate biological and physical processes to better understand and inform stream restoration practices and environmental flow management in regulated rivers. The prosperity of civilizations in Mediterranean climates relies on water management, which involves eternally managing water disputes. Unlike most water hearings in California, this one is a popular tourist attraction and the meeting ends after about 10 minutes.

This photo captures the moment water is returning to a restored wetlands landscape. About a mile away, giant cranes crack open an levee, allowing water to flow up through meandering channels. Here a student researcher focuses quietly on recording water quality, but around her is all movement: the water rolling into the new channel, the crackling of dried vegetation being inundated, insects blowing up in clouds above the water followed by birds of all sorts swooping in to feed. The effect is dizzying and thrilling, to watch and hear the ancient ritual of water meeting land played out again for the first time in a century.

These before-after photos capture the power of a living stream as it shifts and reshapes itself and takes away my stilling well. This stream flows through an active cattle ranch, where the landowners recognize that stewardship includes both land and streamscapes. My research helps people like these ranchers preserve their heritage and livelihoods by guiding decisions about when and where to prioritize conservation. When science is combined with a coalition of the willing, we can have healthy rivers and rangeland.

This is a reminder of how physical processes allow for ecological function. The snow that falls on Mt. Shasta percolates into the ground and emerges as nutrient rich springs. These nutrient rich springs provide a productive food web that allows the Chinook Salmon and other fishes to complete their life histories. It always amazes me that the snow you see in the background of this picture will come out of the ground years after the photo was taken to benefit future generations of fish and other fauna.

A drifter measuring position and shear in river currents floats down the San Joaquin River on approach to the Head of Old River. Data from drifter tracks helps keep our numerical models honest and provides a point of reference when studying how juvenile Chinook salmon navigate this junction on their way to the ocean. Hidden beneath the turbid waters is a network of hydrophones, recording the path of salmon smolts as they enter the Delta.

By comparing data on the movements of water and fish, we learn about the swimming habits of the smolts, and how environmental cues can shape the path that they take through the Delta. Studies such as this one pave the way for effective stewardship of fisheries utilizing the Delta. Rivers connect and carve the landscapes we live in and use. These systems are complex interconnected webs of life which we rely on and are part of, yet for every link that breaks, the systems become less diverse, and a little less stable or reliable. My research uses genetic and ecosystem data to help understand the connections between river organisms and changing environments, so we can prioritize and apply more effective conservation management.

A picture of my normal work would be a picture of a computer screen with 50 windows open. There are many more birds and bird species around us than people generally see without a bird-brain like me to enthusiastically point out even the little brown birds that do not tend to be crowd pleasers. Verdin picture is from the Grand Canyon field trip in —cryptic in the tree until it popped out in the open. Long-earred Owl in Davis December —a rarity here and very cryptic in the tree.

The importance of salmon to ecosystem processes and food webs is well documented. We were still surprised to witness this bobcat feasting on a fall-run Chinook salmon carcass on the upper Sacramento River immediately below Keswick dam. As an aquatic ecologist, I usually have my head in the water too often and need to remind myself that cross-ecosystem subsidies occur all the time and are critical to broader ecological function across the landscape. I spent years researching lake ecosystems in Northern Wisconsin. The emergent aquatic plants in the foreground of this photo is naturally-occurring wild rice. Now I work on rice and agricultural floodplains in California. Juvenile Chinook salmon and many other native fishes once roamed vast floodplain habitats in the Central Valley.

Conservation science and restoration ecology are challenging and interdisciplinary fields. Managing for ecological function necessitates focus on multiple scales of ecological organization while simultaneously integrating feedback loops with critical environmental drivers like temperature, flow and habitat change. This means scientists working on these issues can emerge from diverse areas of inquiry including ecology, engineering, hydrological sciences, fisheries, geology, geography, and law. When I worked in rivers and reservoirs in the southeastern USA, I was always intrigued by the large Baldcypress trees Taxodium distichum , a close relative to our California redwoods growing in the middle of huge reservoirs.

There were always only large trees — never any juveniles. It turns out these trees which are long-lived, like redwoods date back to the original floodplain, before the damming of rivers. Baldcypress are evolutionarily adapted to variable hydrological systems Rypel et al. Thus while trees can persist as adults in reservoirs flooded rivers , the seeds must fall into dry soil to germinate. In others words, reservoir cypress stands were now ecological sinks rather than sources — a form of extinction debt yet to be paid from dam construction.

Yet a community ecologist might go out to reservoirs and, based on presence data, conclude that reservoirs are perfectly optimal habitats for Baldcypress trees. However these habitats clearly are not suitable to complete their life-cycle and these stands are in the process of decline because of hydrological impacts from dams — the decline is just very slow. This example, while admittedly simple, offers a cautionary tale for how we can trick ourselves into focusing on pet ecological aspects and processes while ignoring critical ones.

Holistic approaches are needed to isolate governing ecological dynamics and help guide management. The goal is not to convince that we should all measure or study secondary production. Rather, it is to illustrate the types of dynamics and thinking we might consider for evaluating effects of the vast water projects in California. While I focus on production, many other metrics could be equally relevant e. Secondary production is the formation of biomass that crosses ecological trophic levels through time. It directly parallels the concept of primary production, but is intended for heterotrophic animals rather than plants.

Both primary and secondary production are expressed in the exact same units e. It is also directly analogous to metrics of economic production such as GDP, only in this case, carbon is the currency of import. And while correlated with biomass, production integrates a wider array of critical rate functions for animals including growth, reproduction, mortality, development time and lifespan. For these reasons, secondary production captures underlying dynamics related to energy availability, trophic relationships and turnover.

Interestingly, it also can be quantified at any level of organization — from an individual essentially growth , to a population probably the most common approach , to a community or assembly of species much rarer but still done , or even whole ecosystems quite rare. In a recent paper , we suggest secondary production is an underutilized metric for tracking efficacy of restoration initiatives. Dating back to Lindeman and before, ecologists have been interested in understanding the dynamics of energy transfer in food webs Fig.

Yet most of the literature over the last 30 years has focused on benthic macroinvertebrate communities. The relative paucity of studies for other taxa may have something to do with a perception among other ecologists that these approaches require extensive data that are too costly or laborious to obtain. However, often we are not starting from scratch. For high profile fisheries and ecosystems, all the data needed to estimate secondary production are usually already available Rypel et al.

Furthermore, when data are not available, simple shortcuts can still provide useful paths Rypel and David And usually these analyses yield important insights and patterns. Jeffres et al. A recent analysis found that valuable fish populations were experiencing hidden overfishing only visible after patterns in fish production were calculated and examined relative to harvest rates Embke et al. Another study of California oil platforms found these to apparently be some of the more productive marine habitats known Claisse et al.

Given the challenges of designing and implementing complex restoration studies in this context, it is unsurprising that many do not initially focus on production as a tool. For example, regulatory mechanisms consistently guide us towards species-based management even though many increasingly recognize these approaches as ineffective and in need of a total re-rewrite Fogerty ; Sass et al. Holistic, ecosystem-based approaches offer potential for broad understanding of conditions that can support many species even non-fishes!

Furthermore, focusing on ecological aspects that support general functionality is a more promising and realistic path to improved management. Attempting complete recovery of Delta Smelt is likely impossible at this point. Understanding the conditions that once promoted smelt production, but now support production of natives and similar non-natives e. This context can generate ideas on what actions are needed to boost the type of ecosystem productivity we desire and value. Several larger points come to mind when considering how a production approach could be useful in California:. Synthesis now! In some cases, we already have enough data for production-based approaches and vital rate analyses that leverage oodles of previously collected data.

We simply lack synthesis capacity to fund ecologists to do the work. Transparent and open databases are needed to encourage capacity for diverse scientists to innovate new approaches. Training students and researchers in synthesis, data science, and ecosystem ecology will be key. Design monitoring programs wisely. Careful choice of focal taxa is needed. Ideal monitoring programs would include multiple species, but these might not always be the species at most risk of going away.

They should however be representative of the functionality that is valued. Then for each focal species, data on vital rates would be needed so production or key elements of production can be studied over time. Analyses of relationships between production and environmental variables e. Indeed frameworks incorporating this type of thinking have emerged before Fig. Inventory existing monitoring programs.

How satisfied are we with data currently collected as part of our monitoring programs? Are these data yielding a critical depth of understanding to manage ecosystems? Without giving up on core datasets, can we make small tweaks to incorporate critical elements to help scale to the ecosystem level? Water is central to ecological production, but ecological efficiency is key too. Because secondary production is expressed per-unit-area, it is a mathematical certitude that more habitat water yields more production. However, understanding how to increase production per unit area is less well-understood. This is similar to agriculture — we know more crops can be grown by having a larger acreage in rotation.

The more important challenge is how we grow more crops on the same amount of land? How can we get the most bang per habitat buck in the Delta? This central question can be understood and answered firmly with an ecosystem- or production-based approach. Increasing costs and decreased exports combine with uncertain climate change impacts to create water reliability issues for contractors. How do we get that? A good start might be to focus on defining the ecological functionality that we value or are required to ensure — fish and other ecological production is likely high on this list.

We are ultimately in this together and should focus on metrics that lead to the goal. Study ecology — and management. As shown by the Lindeman example, these are ancient and fundamental quests in ecology. Data collected in California in conjunction with management-relevant research can contribute to advancing basic ecological understanding. Reciprocally, ecology can help advance management by providing clues about how human actions affect ecosystem functionality. A new focus on vital rate functions would provide a rare bridge between basic and applied sciences that few explore.

Doing so will invite more talent into California water and provide greater insights and comparability for needed ecosystem management alternatives. Managing ecosystem restoration: what does success look like? Futures for delta smelt. Functional flows can improve environmental water management in California. Ten realities for managing the Delta. Striped bass control: cure worse than the disease? Benke, A. Secondary production. Trophic basis of production among riverine caddisflies: implications for food web analysis. Ecology 78 4 Brandt, S. Delta Independent Science Board: recent accomplishments and current activities.

Claisse, J. Pondella, M. Love, L. Zahn, C. Williams, J. Williams, and A. Oil platforms off California are among the most productive marine fish habitats globally. Proceedings of the National Academy of Sciences 43 Embke, H. Rypel, S. Carpenter, G. Sass, D. Ogle, T. Cichosz, J. Hennessy, T. Essington, and M. Vander Zanden. Production dynamics reveal hidden overharvest of inland recreational fisheries. Proceedings of the National Academy of Sciences 49 Fogarty, M. The art of ecosystem-based fishery management.

Canadian Journal of Fisheries and Aquatic Sciences 71 3 Jeffres, C. Holmes, T. Sommer, and J. Detrital food web contributes to aquatic ecosystem productivity and rapid salmon growth in a managed floodplain. Kwak, T. Trout production dynamics and water quality in Minnesota streams. Transactions of the American Fisheries Society 1 Layman, C. Secondary production is an underutilized metric to assess restoration initiatives.

Food Webs e Lindeman, R. The trophic-dynamic aspect of ecology. Ecology 23 4 Brandt, T. Collier, B. Atwater, E. Canuel, H. Shemal Fernando, J. Meyer, R. Norgaard, V. Resh, J. Wiens, J. Flows and fishes in the Sacramento-San Joaquin Delta: research needs in support of adaptive management. Parks, T. Predator—prey dynamics mediate long-term production trends of cisco Coregonus artedi in a northern Wisconsin lake. Canadian Journal of Fisheries and Aquatic Sciences 75 11 Rypel, A.

Pervasive hydrologic effects on freshwater mussels and riparian trees in southeastern floodplain ecosystems. Wetlands — Pattern and scale in latitude—production relationships for freshwater fishes. Ecosphere 8 1 :e Goto, G. Sass, and M. Eroding productivity of walleye populations in northern Wisconsin lakes. Canadian Journal of Fisheries and Aquatic Sciences 75 12 Sass, G. Rypel, and J. Inland fisheries habitat management: lessons learned from wildlife ecology and a proposal for change.

Fisheries 42 4 Yes, California will have another multi-year drought. California has immense hydrologic variability, with more droughts and floods per average year than any other part of the country. Eventually, California will have a multi-year drought worse than any we have ever seen. More immediately, since the water year was dry in northern California, will this current Water Year be dry enough to put us into year two of a multi-year drought?

This contrasts with the Eastern US, where rainfed corn or soybeans can die from a few weeks of drought. So far, we are early in the Water Year October — September with essentially no October precipitation and almost none in November. And the 2-week forecast shows no substantial precipitation. People also keep talking about El Nino. Mostly no, at least not by itself. There is only a little correlation. The Sacramento Valley precipitation index today is about 6 inches below average. We have a dry start to the water year, but the year can still become wet. Given the lackluster forecasts, adding a dry December would make a dry year more likely, but still not guaranteed.

Precipitation in northern California does not seem correlated across years, at least not historically, as shown by the plot below. The trend line is essentially flat for precipitation. However, a drier year in terms of runoff tends to make the next year a little drier in runoff, as shown for a similar plot below for runoff instead of precipitation. So this year is likely to have a little less runoff because last year was dry, even if we get average precipitation this year.

Why is there a between-year correlation difference between precipitation and runoff? Runoff is slightly correlated over time because precipitation accumulating in groundwater is likely to increase flow into streams in the next year. Below is a plot of the historical El Nino index against northern California annual streamflow. There is a significant probability that this year will be the second year of a multi-year drought, since last year was dry, and this year seems likely to be dry. At this early time in the water year, the chances seem roughly even, but remain quite substantial. Given such odds, it makes sense to prepare for another dry year, and perhaps several additional dry years.

Reservoir water levels are already below average from last year being dry, and groundwater will be a little lower as well. So we have less water in reserve than last year at this time. If your agency or interest has a drought plan, you are likely to be looking it over and updating it. If your agency or interest does not have a drought plan, what state do you think you live in?

Female Darkblotched Rockfish: A Literature Review spins no deposit no wager Female Darkblotched Rockfish: A Literature Review chafee of rhode island, the most Female Darkblotched Rockfish: A Literature Review republican in the senate. A recent analysis found that valuable fish populations were Female Darkblotched Rockfish: A Literature Review hidden overfishing only visible after Female Darkblotched Rockfish: A Literature Review in fish production were calculated and examined relative to person centred thinking rates Embke et al. Designing a culinology registered based research and development framework Reflection On Informal Education seafood products.