Negative Consequences of Allee Effect are Compounded by Fishing Pressure: Comparison of Queen Conch Reproduction in Fishing Grounds and a Marine Protected Area

2012 ◽  
Vol 88 (1) ◽  
pp. 89-104 ◽  
Author(s):  
Allan W Stoner ◽  
Martha H Davis ◽  
Catherine J Booker
Keyword(s):  
Protected Area ◽  
Allee Effect ◽  
Marine Protected Area ◽  
Fishing Pressure ◽  
Negative Consequences ◽  
Queen Conch

Changes in a coral reef fishery along a gradient of fishing pressure in an Indonesian marine protected area

2013 ◽  
Vol 24 (1) ◽  
pp. 92-103 ◽  
Author(s):  
S. J. Campbell ◽  
A. Mukminin ◽  
T. Kartawijaya ◽  
C. Huchery ◽  
J. E. Cinner
Keyword(s):  
Coral Reef ◽  
Protected Area ◽  
Marine Protected Area ◽  
Fishing Pressure ◽  
Coral Reef Fishery

scholarly journals Larval abundances of rockfishes that were historically targeted by fishing increased over 16 years in association with a large marine protected area

2017 ◽  
Vol 4 (9) ◽  
pp. 170639 ◽  
Author(s):  
Andrew R. Thompson ◽  
Dustin C. Chen ◽  
Lian W. Guo ◽  
John R. Hyde ◽  
William Watson
Keyword(s):  
Marine Protected Areas ◽  
Environmental Conditions ◽  
Protected Area ◽  
Reproductive Output ◽  
Marine Protected Area ◽  
Fishing Effort ◽  
Fishing Pressure ◽  
Conservation Areas ◽  
Management Actions ◽  
Surrounding Areas

Marine protected areas (MPAs) can facilitate recovery of diminished stocks by protecting reproductive adults. To effectively augment fisheries, however, reproductive output must increase within the bounds of MPAs so that larvae can be exported to surrounding areas and seed the region. In response to dramatic declines of rockfishes ( Sebastes spp.) in southern California by the late 1990s two large MPAs, the Cowcod Conservation Areas (CCAs), were established in 2001. To evaluate whether the CCAs affected rockfish productivity we evaluated the dynamics of 8 species that were, and 7 that were not, historically targeted by fishing. Abundances of 6/8 targeted and 4/7 non-targeted species increased regionally from 1998 to 2013. These upturns were probably affected by environmental conditions in addition to changes in fishing pressure as the presence of most species correlated negatively with temperature, and temperature was lower than the historic average in 11/15 years. Seventy-five per cent of the targeted, but none of the non-targeted species increased at a greater rate inside than outside the CCAs while controlling for environmental factors. Results indicate that management actions, coupled with favourable environmental conditions, facilitated the resurgence of multiple rockfish species that were targeted by intense fishing effort for decades.

scholarly journals Growth parameters and density variation of a queen conch, Strombus gigas (Neotaenioglossa: Strombidae), population from Xel-Ha park, a marine protected area

2018 ◽  
Author(s):  
Erick R. Baqueiro-Cardenas
Keyword(s):  
Protected Area ◽  
Marine Protected Area ◽  
Growth Parameters ◽  
Density Variation ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Population Number ◽  
Strombus Gigas ◽  
Queen Conch ◽  
Number Variation

This contribution used mark-recapture data to estimate the von Bertalanffy equation parameters and population number variation within a non harvest population from a protected area, to clarify the biometric parameters that better suit for the whole population, or for the juvenile and adult fractions. Conchs from XelHa Park were monthly sampled from November 2001 to August 2005. Every conch found was measured and marked with a numbered tag that identified month and locality; and monthly abundance was estimated with Jolly’s method. Length, lip thickness and weight increments were used to estimate the von Bertalanffy growth equation parameters with Appeldoorn’s subroutine of FISAT program. The population numbervaried through the study, with a minimum of 49 in April 2003 and maximum of 9 848 during June 2005. Conchs make only temporary use of Xel-Ha cove. Shell length gavethe best fit for the juvenile fraction: L∞=251, K=0.3, C=0.8 Wp=0.3; and lip thickness for adults: L∞=47.78, K=0.17, C=0.1, Wp=0.86, while, the whole population was better represented by weight: L∞=3850, K=0.36, C=0.8, Wp=0.3. A maximum age of 19 years was estimated from the population. Natural mortality was 0.49/year for juveniles and 0.29/year for adults. There were two pulses of recruitment: fall-winter and summer. It is concluded that population studies from length frequency data, should be analyzed independently in two groups, shell for the juvenile fraction and lip thickness for the adult fraction, or if it is not possible to analyze the population fractions separately,weight should be used to avoid miss calculation of the age structure.

Seagrass amphipod assemblages in a Mediterranean marine protected area: a multiscale approach

2014 ◽  
Vol 506 ◽  
pp. 175-192 ◽  
Author(s):  
N Sturaro ◽  
G Lepoint ◽  
A Pérez-Perera ◽  
S Vermeulen ◽  
P Panzalis ◽  
...  
Keyword(s):  
Protected Area ◽  
Marine Protected Area ◽  
Multiscale Approach

Habitat use of toothed whales in a marine protected area based on point process models

2019 ◽  
Vol 609 ◽  
pp. 239-256 ◽  
Author(s):  
TL Silva ◽  
G Fay ◽  
TA Mooney ◽  
J Robbins ◽  
MT Weinrich ◽  
...  
Keyword(s):  
Habitat Use ◽  
Point Process ◽  
Protected Area ◽  
Marine Protected Area ◽  
Process Models ◽  
Point Process Models

What Values Do Tourists Place on a Marine Protected Area? White Shark Cage-Dive Tourists and the Neptune Islands

2019 ◽  
Vol 14 (1) ◽  
pp. 19-30 ◽  
Author(s):  
Kirin Apps ◽  
Kay Dimmock ◽  
David J. Lloyd ◽  
Charlie Huveneers
Keyword(s):  
Protected Area ◽  
Marine Protected Area ◽  
White Shark
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