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You searched for subject:(Spawning aggregations). Showing records 1 – 3 of 3 total matches.

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Texas A&M University

1. Mendez-Jimenez, Adriana. Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize.

Degree: MS, Geography, 2012, Texas A&M University

Most large reef fish use a migratory reproductive strategy and tend to spawn in aggregations that occur at predictable locations and times. Though numerous hypotheses have been formulated to explain the reasons behind this phenomenon, there remain few data to evaluate the relative merits of various hypotheses. Oceanographic variables and lunar cycles are believed to drive the timing and location of this reproductive strategy. However, the dynamics of the interaction between coastal currents, water temperature, biomass concentrations, spawning site selection and gamete transport are still unclear. This study aimed to examine the influence that currents exert on gametes released at spawning aggregations of Cubera snapper Lutjanus cyanopterus (Cuvier, 1828) at Gladden Spit, Belize. It was hypothesized that surface currents flowed offshore at the time and location of spawning. However, observations from this study, using Lagrangian and Eulerian methods, indicated that eggs most likely travel westerly towards the reef and into the reef channel. The dispersal rate of eggs appeared to be explained by a power relationship, with buoyant fertilized eggs dispersing horizontally such that the area of the spawning cloud increased with time. Egg density within the spawning cloud generally decreased over time as it dispersed with the predominant surface currents. Most importantly low-cost surface drifters area an appropriate, highly replicable way to monitor surface ocean currents at spawning sides in areas where more sophisticated methods are not available. Understanding how abiotic factors influence the occurrence of multispecies spawning aggregations will lead to better conservation and management strategies in the Western Caribbean. Advisors/Committee Members: Heyman, William D. (advisor), DiMarco, Steven F. (committee member), Houser, Christopher (committee member).

Subjects/Keywords: Spawning aggregations; Cubera snapper; Gladden Spit; surface currents; drogued surface drifters

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Mendez-Jimenez, A. (2012). Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876

Chicago Manual of Style (16th Edition):

Mendez-Jimenez, Adriana. “Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize.” 2012. Masters Thesis, Texas A&M University. Accessed April 19, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876.

MLA Handbook (7th Edition):

Mendez-Jimenez, Adriana. “Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize.” 2012. Web. 19 Apr 2021.

Vancouver:

Mendez-Jimenez A. Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize. [Internet] [Masters thesis]. Texas A&M University; 2012. [cited 2021 Apr 19]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876.

Council of Science Editors:

Mendez-Jimenez A. Influence of Surface Currents in the Dispersal Pathways of Eggs of Cubera Snapper, Lutjanus cyanopterus (Cuvier, 1828), at a Spawning Aggregation Site at Gladden Spit, Belize. [Masters Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11876


University of California – Santa Cruz

2. Jackson, Alexis Michelle. Conservation Genetics Of Commercially Exploited Fishes With Case Studies On Leopard And Nassau Grouper.

Degree: Ecology and Evolutionary Biology, 2014, University of California – Santa Cruz

Overfishing is contributing to significant declines in marine species worldwide. Here, I evaluated the contribution of genetic data to enhancing conservation and fisheries management of commercially important fishes. First, I conducted two empirical population genetics studies on groupers that aggregate to spawn. I evaluated population structure of Nassau grouper (Epinephelus striatus) across the Caribbean Sea using mitochondrial DNA, microsatellites and single nucleotide polymorphisms (SNPs). Results suggested ocean currents and long distance migrations of adults to spawning sites may contribute to restricted gene flow and regional genetic differentiation among subpopulations, making it less likely that larvae settle beyond catchment areas of spawning sites. Regional patterns of genetic differentiation warrant international collaboration, standardizing fisheries management and conservation initiatives among countries within genetically isolated clusters. I then evaluated population structure of Leopard grouper (Mycteroperca rosacea) in the Gulf of California using mitochondrial DNA and microsatellites. I observed genetic differentiation and asymmetrical connectivity among subpopulations of M. rosacea, with divergence of lineages dating to the late Pleistocene and Holocene. Findings suggest a combination of marine reserves, catch quotas, and seasonal fishery closures as a potential management strategy for M. rosacea in the Gulf of California. Finally, I conducted a meta-analysis of 386 empirical genetics studies on marine and diadromous fishes in order to evaluate the implications of weak or strong population structure on the implementation of fisheries management. Quantitative adjectives used to describe varying magnitudes of genetic differentiation possessed statistically different mean FST values in studies utilizing mtDNA, microsatellites and allozymes. Additionally, mean FST values across stock management strategies were statistically different from one another. Results have major implications for standardizing reporting of metrics of genetic differentiation across empirical population genetics studies focusing on and prescribing stock management strategies for commercially important fishes.

Subjects/Keywords: Genetics; Conservation biology; Fisheries and aquatic sciences; conservation genetics; fisheries management; groupers; population genetics; spawning aggregations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jackson, A. M. (2014). Conservation Genetics Of Commercially Exploited Fishes With Case Studies On Leopard And Nassau Grouper. (Thesis). University of California – Santa Cruz. Retrieved from http://www.escholarship.org/uc/item/0vz0w0x8

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Jackson, Alexis Michelle. “Conservation Genetics Of Commercially Exploited Fishes With Case Studies On Leopard And Nassau Grouper.” 2014. Thesis, University of California – Santa Cruz. Accessed April 19, 2021. http://www.escholarship.org/uc/item/0vz0w0x8.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Jackson, Alexis Michelle. “Conservation Genetics Of Commercially Exploited Fishes With Case Studies On Leopard And Nassau Grouper.” 2014. Web. 19 Apr 2021.

Vancouver:

Jackson AM. Conservation Genetics Of Commercially Exploited Fishes With Case Studies On Leopard And Nassau Grouper. [Internet] [Thesis]. University of California – Santa Cruz; 2014. [cited 2021 Apr 19]. Available from: http://www.escholarship.org/uc/item/0vz0w0x8.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jackson AM. Conservation Genetics Of Commercially Exploited Fishes With Case Studies On Leopard And Nassau Grouper. [Thesis]. University of California – Santa Cruz; 2014. Available from: http://www.escholarship.org/uc/item/0vz0w0x8

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Texas A&M University

3. Granados-Dieseldorff, Pablo. The Mutton Snapper (Lutjanus analis) Spawning Aggregation Fishery at Gladden Spit, Belize: Inter-annual and Within-season Dynamics.

Degree: PhD, Geography, 2013, Texas A&M University

Artisanal fisheries constitute a considerable source of employment, income, and protein for many coastal communities in the Caribbean. One of the region’s most valuable fisheries is for mutton snapper (Lutjanus analis), a coral-reef fish that uses various habitats throughout its life cycle, aggregates to spawn at specific places and times, and is considered vulnerable to extinction. This dissertation focuses on the mutton snapper spawning aggregation fishery at Gladden Spit, Belize (western Caribbean), which has existed since the 1950s. In 2000, the Government of Belize partnered with a community-based nongovernment organization, fishers, and other stakeholders to conserve and co-manage the artisanal fishery. Considering the study fishery as an adaptive socio-environmental fisher-fish system, this dissertation uses a holistic approach to provide baseline socioeconomic and biological information for strengthening conservation and management of mutton snapper fisheries in Belize, applicable to the rest of the Caribbean. The three overall goals of this dissertation were to 1) present the history of the fishery and delineate for the first time its socio-environmental development and impact on inter-annual catch dynamics and yields, using published and grey literature, knowledge of experienced fishers and stakeholders, and data from landings surveys; 2) characterize the fishery’s within-season dynamics in 2011 through analyses of the variability in fishing activity, catch and bycatch, and in size, age, and maturation of reproductive mutton snapper, and 3) evaluate the potential distribution of habitat for early life stages of mutton snapper across the Belize shelf, using a GIS-based multi-criteria modeling approach evaluated in the field. Inter-annual analyses evidenced a considerable reduction in total landings and fishing effort of the fishery in the late 1980s, parallel to a rapid growth in the tourism industry and to a shift in the livelihoods of many local fishers. Between 1999 and 2011, during the co-management period of the fishery, relatively stable values of annual catch per unit effort (CPUE), individual sizes, and sex ratios suggested persistence of the fishery. Otolith, size, and gonad analyses depicted, for the first time for the species, age-, size-, and maturation-structured mutton snapper spawning aggregations. Within-season analyses showed how mutton snapper size, age, and degree of maturation vary in relation to the lunar cycle and throughout the spawning season, with individuals significantly smaller and females mostly immature later in the season. Overall, the within-season dynamics of the fishery were influenced by the lunar and seasonal patterns in the reproductive biology of mutton snapper, interactions with co-occurring fisheries, and the experience and traditions of local fishers. The GIS-based model provided a common spatial framework for guiding conservation and spatial management of mutton snapper in Belize and highlighted a low degree of protection currently afforded to critical… Advisors/Committee Members: Heyman, William D (advisor), Roark, Erin B (advisor), Houser, Chris (committee member), Rooker, Jay R (committee member), Stronza, Amanda (committee member).

Subjects/Keywords: Artisanal fisheries; Lutjanidae; Reef fish spawning aggregations; Data-poor fisheries; Socio-environmental systems; Age and gowth; GIS modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Granados-Dieseldorff, P. (2013). The Mutton Snapper (Lutjanus analis) Spawning Aggregation Fishery at Gladden Spit, Belize: Inter-annual and Within-season Dynamics. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151808

Chicago Manual of Style (16th Edition):

Granados-Dieseldorff, Pablo. “The Mutton Snapper (Lutjanus analis) Spawning Aggregation Fishery at Gladden Spit, Belize: Inter-annual and Within-season Dynamics.” 2013. Doctoral Dissertation, Texas A&M University. Accessed April 19, 2021. http://hdl.handle.net/1969.1/151808.

MLA Handbook (7th Edition):

Granados-Dieseldorff, Pablo. “The Mutton Snapper (Lutjanus analis) Spawning Aggregation Fishery at Gladden Spit, Belize: Inter-annual and Within-season Dynamics.” 2013. Web. 19 Apr 2021.

Vancouver:

Granados-Dieseldorff P. The Mutton Snapper (Lutjanus analis) Spawning Aggregation Fishery at Gladden Spit, Belize: Inter-annual and Within-season Dynamics. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Apr 19]. Available from: http://hdl.handle.net/1969.1/151808.

Council of Science Editors:

Granados-Dieseldorff P. The Mutton Snapper (Lutjanus analis) Spawning Aggregation Fishery at Gladden Spit, Belize: Inter-annual and Within-season Dynamics. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151808

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