scholarly journals Bayesian depletion model estimates of spiny lobster abundance at two marine protected areas in Belize with or without in-season recruitment

2014 ◽  
Vol 72 (suppl_1) ◽  
pp. i232-i243 ◽  
Author(s):  
Elizabeth A. Babcock ◽  
William J. Harford ◽  
Robin Coleman ◽  
Janet Gibson ◽  
Julio Maaz ◽  
...  
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Marine Reserve ◽  
Spiny Lobster ◽  
Fishing Mortality ◽  
Catch Per Unit Effort ◽  
Strombus Gigas ◽  
Queen Conch ◽  
Opening And Closing ◽  
Typical Model

Abstract In Belize, beginning in 2011 at Glover's Reef Marine Reserve, and in 2012 at Port Honduras Marine Reserve, fishers have been required to keep logbooks to document their catch and effort. A Bayesian depletion model including in-season recruitment was applied to the standardized catch per unit effort (cpue) of Caribbean spiny lobster (Panulirus argus) from the logbooks to estimate the abundance and fishing mortality of lobsters at both sites. Two alternative subsets of the cpue data were used to account for changes in targeting caused by the opening and closing of the queen conch (Strombus gigas) season. At Glover's Reef, a typical model estimated abundance ∼66–79 000 lobsters. Of these, ∼60–85% were present at the beginning of the season and the rest recruited into the fished population later in the season. The depletion model applied to data from the 2012 season at Port Honduras found an abundance of ∼12 000 lobsters, and in-season recruitment was not supported by the data. That in-season recruitment was present at Glover's Reef and not at Port Honduras may be explained by the fact that Glover's Reef has more unfished areas that could serve as a source of adult lobsters during the season. Glover's Reef has a larger no-take zone (20% of the reserve area, compared with 5% at Port Honduras), and it is surrounded by a deep wall reef where lobsters are found below the depth accessible to fishers. The models estimated a harvest fraction of ∼70% in both reserves.

scholarly journals Evidence that spillover from Marine Protected Areas benefits the spiny lobster (Panulirus interruptus) fishery in southern California

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hunter S. Lenihan ◽  
Jordan P. Gallagher ◽  
Joseph R. Peters ◽  
Adrian C. Stier ◽  
Jennifer K. K. Hofmeister ◽  
...  
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Spiny Lobster ◽  
Fishing Effort ◽  
Fishing Ground ◽  
Catch Per Unit Effort ◽  
Panulirus Interruptus ◽  
The Status ◽  
Larval Production ◽  
And Behavior

AbstractMarine Protected Areas (MPAs) are designed to enhance biodiversity and ecosystem services. Some MPAs are also established to benefit fisheries through increased egg and larval production, or the spillover of mobile juveniles and adults. Whether spillover influences fishery landings depend on the population status and movement patterns of target species both inside and outside of MPAs, as well as the status of the fishery and behavior of the fleet. We tested whether an increase in the lobster population inside two newly established MPAs influenced local catch, fishing effort, and catch-per-unit-effort (CPUE) within the sustainable California spiny lobster fishery. We found greater build-up of lobsters within MPAs relative to unprotected areas, and greater increases in fishing effort and total lobster catch, but not CPUE, in fishing zones containing MPAs vs. those without MPAs. Our results show that a 35% reduction in fishing area resulting from MPA designation was compensated for by a 225% increase in total catch after 6-years, thus indicating at a local scale that the trade-off of fishing ground for no-fishing zones benefitted the fishery.

scholarly journals Factors affecting relative abundance of low-mobility fishing resources: spiny lobster in the Galapagos Marine Reserve

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7278 ◽  
Author(s):  
Juan Carlos Murillo-Posada ◽  
Silvia Salas ◽  
Iván Velázquez-Abunader
Keyword(s):  
Monitoring System ◽  
Relative Abundance ◽  
Spatial Scales ◽  
Marine Reserve ◽  
Spiny Lobster ◽  
Fishing Effort ◽  
Additive Models ◽  
Catch Per Unit Effort ◽  
Monthly Basis ◽  
Galapagos Marine Reserve

Management of low-mobility or benthic fisheries is a difficult task because variation in the spatial distribution and population dynamics of the resources make the monitoring and assessment of these fisheries challenging. We assumed that environmental, spatial, and temporal factors can contribute to the variability of the relative abundance of such species; we used Generalized Additive Models for Location Scale and Shape (GAMLSS) to test this hypothesis using as a case study the lobster fishery (targeting two species) in the Galapagos Marine Reserve, Ecuador. We gathered data on each of the two species of lobster on a monthly basis over seven years, including: (a) onboard observers’ records of catch data, fishing effort, and ground location by trip, and (b) data from interviews undertaken with fishers at their arrival to port, recording the same type of information as obtained from onboard observers. We use this information to analyze the effect of the measured variables and to standardize the Catch per Unit Effort (CPUE) in each case, using the GAMLSS. For both species, the temperature, region, fishing schedule, month, distance, and the monitoring system were significant variables of the selected models associated with the variability of the catch rate. ForPanulirus penicillatus, CPUE was higher at night than during the day, and forPanulirus gracilisit was higher during the day. Increased temperature resulted in a decrease of CPUE values. It was evident that temporal, spatial scales and monitoring system can influence the variability of this indicator. We contend that the identification of drivers of change of relative abundance in low-mobility species can help to support the development of monitoring and assessment programs for this type of fisheries.

scholarly journals eDNA metabarcoding as a biomonitoring tool for marine protected areas

2020 ◽  
Author(s):  
Zachary Gold ◽  
Joshua Sprague ◽  
David J. Kushner ◽  
Erick Zerecero ◽  
Paul H. Barber
Keyword(s):  
Protected Areas ◽  
Fish Species ◽  
Marine Protected Areas ◽  
Marine Reserve ◽  
Marine Ecosystem ◽  
Site Occupancy ◽  
Visual Methods ◽  
Visual Census ◽  
Underwater Visual Census ◽  
Promising Alternative

AbstractMonitoring of marine protected areas (MPAs) is critical for marine ecosystem management, yet current protocols rely on SCUBA-based visual surveys that are costly and time consuming, limiting their scope and effectiveness. Environmental DNA (eDNA) metabarcoding is a promising alternative for marine ecosystem monitoring, but more direct comparisons to visual surveys are needed to understand the strengths and limitations of each approach. This study compares fish communities inside and outside the Scorpion State Marine Reserve off Santa Cruz Island, CA using eDNA metabarcoding and underwater visual census surveys. Results from eDNA captured 76% (19/25) of fish species and 95% (19/20) of fish genera observed during pairwise underwater visual census. Species missed by eDNA were due to the inability of MiFish 12S barcodes to differentiate species of rockfishes (Sebastes, n=4) or low site occupancy rates of crevice-dwelling Lythrypnus gobies. However, eDNA detected an additional 30 fish species not recorded in paired visual surveys, but previously reported from prior visual surveys, highlighting the sensitivity of eDNA. Significant variation in eDNA signatures by location (50m) and site (~1000m) demonstrates the sensitivity of eDNA to address key questions such as community composition inside and outside MPAs. Interestingly, eDNA results recorded higher species richness outside the MPA while visual surveys observed the opposite pattern. This result is likely caused by swamping effects of high fish abundance in MPAs that reduce detection probabilities of pelagic and intertidal taxa. Results demonstrate the utility of eDNA metabarcoding for monitoring marine ecosystems, providing an important complementary tool to visual methods.

Bias in evaluating the effects of marine protected areas: the importance of baseline data for the Galapagos Marine Reserve

2004 ◽  
Vol 31 (3) ◽  
pp. 212-218 ◽  
Author(s):  
G.J. EDGAR ◽  
R.H. BUSTAMANTE ◽  
J.-M. FARIÑA ◽  
M. CALVOPIÑA ◽  
C. MARTÍNEZ ◽  
...  
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Marine Reserve ◽  
Baseline Data ◽  
Important Species ◽  
Fishery Resource ◽  
Political Processes ◽  
High Level ◽  
Conservation Zones ◽  
Galapagos Marine Reserve

Analysis of ecological baseline data collected for key resource species within the Galapagos Marine Reserve indicates that variation in animal density associated with the location of fully protected zones can be comparable to protected area effects. Even with a high level of interspersion between conservation, tourism and fishing management zones, major differences in densities of economically important species were evident between zone types prior to enforcement of fishing restrictions. Densities of the most valuable fishery resource, sea cucumbers, were three times higher in zones that remained open to fishing compared to ‘no-take’ conservation zones, and densities of sharks were five times higher in tourism zones than fishing or conservation zones. These results highlight bias in the socio-political processes that can accompany selection of marine protected areas, where fishers attempt to minimize perceived impacts on their livelihood by locating large protected zones in resource-poor areas, and tourism operators and sport divers argue for protection of areas containing atypically-interesting features. Bias in the location of fully protected zones can seriously confound ‘control-impact’ field investigations when data prior to prohibitions on fishing are lacking, including meta-analyses, which are dominated by such potentially systematically biased studies.

scholarly journals eDNA metabarcoding as a biomonitoring tool for marine protected areas

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0238557
Author(s):  
Zachary Gold ◽  
Joshua Sprague ◽  
David J. Kushner ◽  
Erick Zerecero Marin ◽  
Paul H. Barber
Keyword(s):  
Protected Areas ◽  
Fish Species ◽  
Marine Protected Areas ◽  
Marine Reserve ◽  
Marine Ecosystem ◽  
Site Occupancy ◽  
Visual Methods ◽  
Visual Census ◽  
Underwater Visual Census ◽  
Promising Alternative

Monitoring of marine protected areas (MPAs) is critical for marine ecosystem management, yet current protocols rely on SCUBA-based visual surveys that are costly and time consuming, limiting their scope and effectiveness. Environmental DNA (eDNA) metabarcoding is a promising alternative for marine ecosystem monitoring, but more direct comparisons to visual surveys are needed to understand the strengths and limitations of each approach. This study compares fish communities inside and outside the Scorpion State Marine Reserve off Santa Cruz Island, CA using eDNA metabarcoding and underwater visual census surveys. Results from eDNA captured 76% (19/25) of fish species and 95% (19/20) of fish genera observed during pairwise underwater visual census. Species missed by eDNA were due to the inability of MiFish 12S barcodes to differentiate species of rockfishes (Sebastes, n = 4) or low site occupancy rates of crevice-dwelling Lythrypnus gobies. However, eDNA detected an additional 23 fish species not recorded in paired visual surveys, but previously reported from prior visual surveys, highlighting the sensitivity of eDNA. Significant variation in eDNA signatures by location (50 m) and site (~1000 m) demonstrates the sensitivity of eDNA to address key questions such as community composition inside and outside MPAs. Results demonstrate the utility of eDNA metabarcoding for monitoring marine ecosystems, providing an important complementary tool to visual methods.

scholarly journals Managing mobile species with MPAs: the effects of mobility, larval dispersal, and fishing mortality on closure size

2008 ◽  
Vol 66 (1) ◽  
pp. 122-131 ◽  
Author(s):  
W. J. F. Le Quesne ◽  
Edward A. Codling
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Larval Dispersal ◽  
Population Model ◽  
Marine Reserves ◽  
Spatially Explicit ◽  
Fishing Mortality ◽  
Mobile Species ◽  
Explicit Dynamic ◽  
Dynamic Population

Abstract Le Quesne, W. J. F., and Codling, E. A. 2009. Managing mobile species with MPAs: the effects of mobility, larval dispersal, and fishing mortality on closure size. – ICES Journal of Marine Science, 66: 122–131. The use of closed areas (marine protected areas, marine reserves, no-take zones) has been suggested as a possible solution to the perceived global fisheries crisis. However, to optimize the design and evaluate the effectiveness of closed areas, we need to understand the interaction between larval dispersal, adult mobility, and fishing mortality. In this paper, a simple, spatially explicit dynamic population model was developed to examine the effects of these interacting factors on optimal closure size and resulting yields. The effect of using one large or several smaller closed areas was also examined. Our model confirmed previous results: closed areas do not improve the yield of populations that are optimally managed or underexploited and, as mobility increases, optimum closure size increases. The model also predicted some interesting counter-intuitive results; for overexploited stocks, the greatest benefit from closed areas can be obtained for stocks with highest mobility, although this may require closure of 85% of the total area. For the tested parameter settings, adult spillover had greater potential to improve yield than larval export, and using several small closed areas rather than a single larger one had the same effect as increasing the mobility of the population.

Distribution and abundance of Caribbean spiny lobsters in the Key West National Wildlife Refuge: relationship to habitat features and impact of an intensive recreational fishery

2001 ◽  
Vol 52 (8) ◽  
pp. 1567 ◽  
Author(s):  
David B. Eggleston ◽  
Craig P. Dahlgren
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Spiny Lobster ◽  
Habitat Characteristics ◽  
National Wildlife Refuge ◽  
Habitat Features ◽  
Wildlife Refuge ◽  
Key West ◽  
Reduced Density ◽  
The Impact

During 1999 we determined abundance and size frequency of the Caribbean spiny lobster, Panulirus argus, in various habitats within the ‘Lakes’ and ‘Marquesas’ regions (122 km2 ) of the Key West National Wildlife Refuge (KWNWR), USA, using visual surveys. We also assessed the relationship between lobster abundance and habitat characteristics. During July–August 2000, we quantified the impact of a two-day recreational fishing ‘miniseason’ in fished and nonfished areas within the KWNWR. Lobster density was highest in channels, followed by hard bottom and patch reefs. P. argus was rarely observed in sea-grass and never in mangrove prop-roots. Its density was related to density and volume of large sponges in channel habitats. Although channels represent only 0.06% of the study area, they provide abundant refuges and a likely corridor for migrating juveniles. The two-day fishing season reduced density of lobsters >7 cm CL by an average of 80% across several habitats, including three marine protected areas closed to fishing. The observed decline was probably due to fishing, because percent change in density was related to number of recreational boats anchored at a given site. Relatively small marine protected areas (30–150 ha) may therefore be too small to protect the population structure of P. argus adequately within the KWNWR.

scholarly journals FUZZY RULE-BASED MODEL FOR OPTIMAL MANAGEMENT OF MARINE PROTECTED AREAS: A CASE STUDY ON THE MARINE RESERVE CERBÈRE-BANYULS

2017 ◽  
Vol 5 (7) ◽  
pp. 239-251
Author(s):  
Afraa Ghanem ◽  
Ali Zaher
Keyword(s):  
Land Use ◽  
Protected Areas ◽  
Marine Protected Areas ◽  
Fuzzy Inference ◽  
Marine Reserve ◽  
Fuzzy Rule ◽  
Good Efficiency ◽  
Coastal Aquaculture ◽  
Land Use Conflicts ◽  
Inference Systems

Marine spatial planning (MSP) is considered as one of the most appropriate ways to create and manage marine protected areas (MPAs) around the world. However, conservation constraints and the increase in competition for limited space and resources can generate land use conflicts. The purpose of this study is to develop an approach based on fuzzy inference systems FIS in order to solve the problem of land use conflicts in the Marine Reserve Cerbère-Banyuls in France. The advantage of the proposed method is that expert scientific knowledge in coastal aquaculture activities and the GIS data can be incorporated into a geospatial model to create optimal maps for spatial distribution of activities in the MPAs. This method is applied to the reserve Cerbère-Banyuls and it demonstrated a good efficiency.

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