scholarly journals Landscape-scale social and ecological outcomes of dynamic angler and fish behaviours: processes, data, and patterns

2019 ◽  
Vol 76 (6) ◽  
pp. 970-988 ◽  
Author(s):  
Thomas R. Carruthers ◽  
Kornelia Dabrowska ◽  
Wolfgang Haider ◽  
Eric A. Parkinson ◽  
Divya A. Varkey ◽  
...  
Keyword(s):  
Fish Population ◽  
Landscape Scale ◽  
Fish Populations ◽  
Current Management ◽  
Social Ecological ◽  
Recreational Fishery ◽  
Spatial Redistribution ◽  
Behavioural Interactions ◽  
Management Policies ◽  
Lake Fisheries

The first relatively complete landscape-scale social–ecological system (SES) model of a recreational fishery was developed and ground-truthed with independent angling effort data. Based on the British Columbia multistock recreational fishery for rainbow trout (Oncorynchus mykiss), the model includes hundreds of individual lake fisheries, hundreds of thousands of anglers, originating from tens of communities, connected by complex road and trail networks, all distributed over a landscape of approximately half a million square kilometres. The approach is unique in that it incorporates realistic and empirically derived behavioural interactions within and among the three key components of the SES: angler communities, fish populations, and management policies. Current management policies were characterized and alternate policies assessed by simulation. We examined spatial patterns in ecological and social properties of the SES and used simulations to investigate the impacts of alternate management policies on these patterns. Simulation outcomes strongly depended on the spatial redistribution of anglers across the landscape, existing road networks, heterogeneity in angler behaviours, and the spatial pattern of fish population productivity.

scholarly journals Climate Change, Agency Decision-Making, and the Resilience of Land-Based Livelihoods

2020 ◽  
Vol 12 (4) ◽  
pp. 711-727
Author(s):  
Corrine Noel Knapp ◽  
Shannon M. McNeeley ◽  
John Gioia ◽  
Trevor Even ◽  
Tyler Beeton
Keyword(s):  
Climate Change ◽  
Decision Making ◽  
Rural Communities ◽  
Change Agency ◽  
Bureau Of Land Management ◽  
Current Management ◽  
Management Policies ◽  
Management Changes ◽  
Collaborative Efforts ◽  
Adaptive Actions

AbstractMany rural communities in the western United States are surrounded by public lands and are dependent on these landscapes for their livelihoods. Climate change threatens to affect land-based livelihoods through both direct impacts and public land agency decision-making in response to impacts. This project was designed to understand how Bureau of Land Management (BLM) permittees, including ranching and recreation-based businesses in Colorado, are vulnerable to both climate change and management responses and how permittees and the BLM are adapting and could adapt to these changes. We conducted 60 interviews in two BLM field offices to gather permittee and agency employees’ observations of change, impacts, responses, and suggestions for adaptive actions. Data suggested that permittees are dependent on BLM lands and are sensitive to ecological and management changes and that current management policies and structures are often a constraint to adaptation. Managers and permittees are already seeing synergistic impacts, and the BLM has capacity to facilitate or constrain adaptation actions. Participants suggested increased flexibility at all scales, timelier within-season adjustments, and extension of current collaborative efforts to assist adaptation efforts and reduce impacts to these livelihoods.

scholarly journals Local community’s perspective on the current state and management of “Sendang Kalimah Toyyibah” Spring

2018 ◽  
Vol 1 (2) ◽  
pp. 13
Author(s):  
Erry Wiryani ◽  
Murningsih Murningsih
Keyword(s):  
Measurement Data ◽  
Management Plan ◽  
Ecological Condition ◽  
Cultural Value ◽  
Current Management ◽  
Local Factor ◽  
Current State ◽  
Ecological Changes ◽  
Forest Coverage ◽  
Management Policies

“Sendang Kalimah Toyyibah” is important spring with socio cultural value. However, the increasing activity might cause ecological changes which may affect the sustainability. This research aimed to study the condition of “Sendang Kalimah Toyyibah” based on local society’s perspective to analyze the correlation of the condition toward the management policies, and to formulate the management strategy for sustainable management of the spring. The research was conducted from April to May 2018, through field observation. The research instrument used was questionnaire with three level of likert scale measurement. Data analysis was conducted by descriptive and statistical analysis with correlation and crosstabulation. The result showed that most of the respondents agreed that the spring has changed in the last 5 years. The local factor related to the change of the spring is the development of facilities. However, the change of the spring was not followed by the change of ecological condition, such as reduced debit, decreased water quality and decreased forest coverage. The current management of “Sendang Kalimah Toyyibah” was limitation of exploitation. However, currently there is no replantation effort or development of preservation area even though some respondents suggested that some plants species is no loger found in the spring ecosystem. Suggested management plan included plantation of the spring surrounding to increase plants density and diversity.  

scholarly journals Social-Ecological Connectivity to Understand Ecosystem Service Provision across Networks in Urban Landscapes

Land ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 530
Author(s):  
Monika Egerer ◽  
Elsa Anderson
Keyword(s):  
Land Use ◽  
Ecosystem Services ◽  
Landscape Connectivity ◽  
Urban Ecosystem ◽  
Landscape Scale ◽  
Urban Landscapes ◽  
Ecological Processes ◽  
Ecological Connectivity ◽  
Social Ecological ◽  
Scale Network

Landscape connectivity is a critical component of dynamic processes that link the structure and function of networks at the landscape scale. In the Anthropocene, connectivity across a landscape-scale network is influenced not only by biophysical land use features, but also by characteristics and patterns of the social landscape. This is particularly apparent in urban landscapes, which are highly dynamic in land use and often in social composition. Thus, landscape connectivity, especially in cities, must be thought of in a social-ecological framework. This is relevant when considering ecosystem services—the benefits that people derive from ecological processes and properties. As relevant actors move through a connected landscape-scale network, particular services may “flow” better across space and time. For this special issue on dynamic landscape connectivity, we discuss the concept of social-ecological networks using urban landscapes as a focal system to highlight the importance of social-ecological connectivity to understand dynamic urban landscapes, particularly in regards to the provision of urban ecosystem services.

STRUCTURE OF FISH POPULATION OF THE BAIDARATAYAHA RIVER'S BASIN

2017 ◽  
pp. 33-44 ◽  
Author(s):  
Vladimir Dmitrievich Bogdanov ◽  
Elena Nikolaevna Bogdanova ◽  
Yan Albertovich Kizhevatov ◽  
Irina Pavlovna Melnichenko
Keyword(s):  
Species Diversity ◽  
Pink Salmon ◽  
Fish Population ◽  
Kara Sea ◽  
Arctic Char ◽  
The Other ◽  
Fish Populations ◽  
Deep Lakes ◽  
First Time ◽  
Fish Productivity

The data of studies of fish populations in the basin of the Baidaratayakha river, received in 1998, 2002, 2013, 2014 are summarized for the first time. 18 species of fish are noted. Most of them belong to commercial and valuable species. The greatest species diversity is characteristic of the lower reaches of the river. In deep lakes and sections of the river near these lakes the density of fishes is higher. Scantiness of the fish population of river sites is due to the fact that most of the riverbeds in winter freeze. For this reason, there is no common minnow in the rivers. In most of the tundra non-riverine lakes that dominate among the waterbodies of the basin, there are no fish due to their shallow water and freezing. Some lakes of the lower reaches of the Baidaratayakha river are inhabited by fish only in summer (Asian smelt for breeding and whitefish for feeding). In some lakes, residential groupings (whitefish and pike) are formed. The estuary is used for feeding of whitefish from the Yuribey river and migrants from various regions of the Kara Sea (Arctic char, pink salmon, omul). The omul remains for the wintering in the estuary, most of the other whitefish return to the Yuribey river. The number of populations of residential forms of fish in most lakes is low due to low fish productivity and poaching. To preserve the resources of valuable fish species, it is proposed to include into the existing reserve Gornohadatinsky section of the upper and middle course of the Baidaratayakha river, where there are lakes that provide a reserve of grayling, and spawning grounds for the reproduction of arctic char and pink salmon.

Nutrients in Salmonid Ecosystems: Sustaining Production and Biodiversity

2003 ◽  
Keyword(s):  
Ecosystem Function ◽  
Fish Populations ◽  
Alternative Methods ◽  
Ecosystem Productivity ◽  
Ecosystem Recovery ◽  
Current Management ◽  
Stream Flows ◽  
Riparian Habitats ◽  
Productivity Potential ◽  
Salmon Carcasses

<em>Abstract.</em>—Based on the information presented at the Restoring Nutrients to Salmonid Ecosystems conference in Eugene, Oregon, in April of 2001, it will be necessary to substantially increase and achieve salmon spawner escapement goals in order to meet ecosystem productivity potential. Modeling of recovery rates shows that achievement of even the currently identified spawner escapement goals (much less ecosystem recovery) in less than 50–100 years is unlikely, unless there are substantial shifts in management thought and practice. To speed recovery, it is necessary to achieve consistent rates of increase in spawning escapement not seen in current management activities. Until actual spawner escapements approach levels necessary to support ecosystem function, it will be necessary to utilize alternative methods such as the distribution of salmon carcasses, carcass analogs, or the use of fertilizer to provide the nutrients needed to assist its salmonid population recovery. In addition to restoring absolute numbers, the size and age structures of the fish populations need to be restored in order to successfully utilize the available environment. Simply increasing escapements and resultant nutrient levels, however, is insufficient. Stream flows, whether average, flood, or low, need to be stabilized. Instream and riparian habitats need to be stabilized and restored; this would include allowing normal flood paths to be followed.

scholarly journals Evolutionary response to size-selective mortality in an exploited fish population

2007 ◽  
Vol 274 (1613) ◽  
pp. 1015-1022 ◽  
Author(s):  
Douglas P Swain ◽  
Alan F Sinclair ◽  
J Mark Hanson
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Fish Population ◽  
Fish Populations ◽  
Selective Mortality ◽  
Genetic Changes ◽  
Evolutionary Response ◽  
In The Wild ◽  
Size At Age ◽  
Change In Mean

Many collapsed fish populations have failed to recover after a decade or more with little fishing. This may reflect evolutionary change in response to the highly selective mortality imposed by fisheries. Recent experimental work has demonstrated a rapid genetic change in growth rate in response to size-selective harvesting of laboratory fish populations. Here, we use a 30-year time-series of back-calculated lengths-at-age to test for a genetic response to size-selective mortality in the wild in a heavily exploited population of Atlantic cod ( Gadus morhua ). Controlling for the effects of density- and temperature-dependent growth, the change in mean length of 4-year-old cod between offspring and their parental cohorts was positively correlated with the estimated selection differential experienced by the parental cohorts between this age and spawning. This result supports the hypothesis that there have been genetic changes in growth in this population in response to size-selective fishing. Such changes may account for the continued small size-at-age in this population despite good conditions for growth and little fishing for over a decade. This study highlights the need for management regimes that take into account the evolutionary consequences of fishing.

The monitoring of biological effects: the separation of natural changes from those induced by pollution

1979 ◽  
Vol 286 (1015) ◽  
pp. 597-609 ◽  
Keyword(s):  
Biological Effects ◽  
Total Mortality ◽  
Fish Population ◽  
Maximum Sustainable Yield ◽  
The Self ◽  
Fish Populations ◽  
Sustainable Yield ◽  
Density Dependent Mortality ◽  
Unknown Risk ◽  
Dependent Mortality

An added mortality rate of eggs, larvae and juveniles of fish populations, or impact, is assumed to be density independent. The total mortality from hatching to recruitment is represented by the fecundity, and any increment in density independent mortality implies a decrement in density dependent mortality. At high stock the consequence is an increase in stock towards a position of less resilience: at low stock less resilience is found with a decrease in stock. In general impact generates a shift of K -strategy, the self-stabilizing strategy, to r -strategy, an opportunistic one. In a fish population very little impact should be tolerated at low stock because it would prevent recovery to a management objective such as maximum sustainable yield. At high stock, impact may generate more stock at an unknown risk.

Sign in / Sign up

Export Citation Format

Share Document