Mangrove and Fisheries Restoration in Sinaloa and Nayarit, Mexico
Coastal mangrove forests of Sinaloa and Nayarit, Mexico are highly productive ecosystems that not only serve as important carbon sinks but also provide a myriad of other critical ecosystem services, including nursery and spawning areas for commercially valuable fish species. The mangrove forests also support a diverse assemblage of other plant and animal species, including 350 species of birds and 40 species of endemic fauna (invertebrates, fish, reptile, amphibians, birds, and mammals). It is an important wintering region for migratory birds. Local residents rely upon mangroves for sustenance and livelihood from commercial fisheries. When mangroves are restored, there will be more sustainable jobs for local citizens.
There are two primary interrelated aspects to this effort:
Mangrove Forest Restoration
This comprehensive project is intended to significantly lower greenhouse gas emissions arising from the degradation and loss of mangroves in the Pacific coastal mangrove estuaries . The project will also help to restore the basis for healthy local fisheries, benefit the abundant wildlife like ocelotes captured on a camera trap, and help grow tourism economies. We are working with a number of partners to restore the physical processes and conditions necessary for the regeneration of mangrove forests in several large areas that formerly supported healthy systems, and to protect these and other areas from future disturbances that would otherwise contribute to global climate change.
In 2014 – 2016, EcoWB has engaged with its partners on the following accomplishments:
- April, 2016 — EcoWB volunteers met in San Blas, Nayarit with representatives of Pronatura Noroeste AC, ERM, and UNAM to discuss strategies for assisting with mangrove protection and restoration. The visit included a workshop and a field trip to compare healthy and dead mangrove areas. Plans are underway for EcoWB to assist with technical assessment and monitoring, modeling of sequestered carbon, and development of a carbon crediting program.
- March and April, 2014 — EcoWB and SFF co-organized and attended the Second International Mangroves as Fish Habitat Symposium, as part of the Western Division American Fisheries Society meeting in Mazatlán. This conference allowed us to convene local, regional, and international experts on mangroves to set the stage for our cooperative efforts on this project.
- April 8, 2014 – Presentation on this project at the symposium.
- April 9, 2014 – Hosted strategy meeting to coordinate the project with representatives of UNAM, CONAFOR, Pronatura Noroeste, World Wildlife Mexico, Universidad Autonoma de Sinaloa, and the University of Oregon.
- April 10, 2014 – Field trip to Sinaloa mangroves with UNAM scientists to explore various mangrove restoration and assessment techniques.
- September, 2014 – Present – EcoWB volunteer Phil Howell, retired from U.S. Forest Service, has taken the lead on Objective 1, developing the technical aspects of the remote sensing of mangroves. He has built a partnership with the U.S. Forest Service’s Remote Sensing Applications Center. RSAC is writing a protocol and will assist in remote sensing of mangroves.
- November, 2014 – January, 2015 – Negotiated and signed an MOU between EcoWB, SFF, and Pronatura Noroeste that committed the three parties to work together on mangrove restoration in Sinaloa and Nayarit, Mexico.
- January – February, 2015 – Wrote a Concept Paper (final draft is attached) for submission by Pronatura Noroeste to USAID for a grant to implement the two objectives plus a number of other mangrove restoration tasks. (This was partly based on USAID’s interest in a previous full proposal we submitted to them in 2012.)
- Ongoing – Monthly calls with ERMers who are volunteering their time on the project, particularly in developing the details on the two project objectives. ERMers completed a detailed review of the major global carbon crediting programs to identify the program best suited to mangrove carbon crediting.
Our Partner Organizations:
Sustainable Fisheries Foundation — Project management and technical input
ERM and the ERM Foundation– Strategic planning and technical assistance
Pronatura Noroeste AC – Coordination with local, regional, and federal stakeholders, as well as eventual on-the ground guidance for implementation of restoration
UNAM – Technical and scientific guidance on mangrove assessment and ecology, as well as local fisheries expertise
U.S. Forest Service, RSAC – Technical assistance on remote sensing and ground-truthing
Forest Trends – Relationship building and technical guidance on carbon crediting
University of Oregon – Technical and strategic guidance on mangrove ecology and carbon crediting
Mangrove Fisheries Restoration and Management
In this mangrove fisheries project, EcoWB ESPs Dr. Eric Knudsen and Cleve Steward are collaborating in fisheries and mangrove research by providing consultation on experimental design, fish marking techniques, and assistance in field work, as well as preparing proposals for additional funding. This is a collaboration with Drs. Felipe Amezcua Martinez and Francisco Verdugo Flores, and their students, of Universidad Nacional Autonoma de Mexico, Instituto Ciencias del Mar y Limnologia, in Mazatlan, Sinaloa State, Mexico. Northwest Marine Technology has also contributed fish tagging materials and consultation.
Importance of estuarine and coastal lagoon systems with mangrove forests in the life cycle of demersal fishes in the southern Gulf of California have always been regarded as high productive zones that serve as an intermediate nursery habitat that may increase the survivorship of young ﬁsh. It has been proved that, in the Caribbean, mangroves strongly inﬂuence the community structure of ﬁsh on neighboring coral reefs, and it has been observed that the biomass of several commercially important species is more than doubled when adult habitat is connected to mangroves. In the Gulf of California, some studies suggest that ﬁsheries landings are positively related to the local abundance of mangroves and, in particular, to the productive area in the mangrove–water fringe that is used as nursery and/or feeding grounds by many commercial species. These studies estimated that the mangrove-related ﬁsh and crab species account for 32% of the small-scale ﬁsheries landings in the region. However, the studies undertaken in the Gulf of California are based on the perception of fishermen. No real data obtained from sampling surveys has been analyzed in this region.
Other studies have argued that the function that has always been assigned to the mangroves can also be accomplished by other coastal areas, coastal lagoons, estuaries and estuarine systems without mangrove forests. The problem is that the importance that all these habitats have on the life cycle of demersal fish species, including those of economic importance, has rarely been assessed.
In this sense, the main objective of this study is to determine the role and the importance that mangrove systems have in the life cycle of demersal fish in the southern Gulf of California, which is a site where an extensive small-boat artisanl fishing fleet operates in these kind of systems. The working hypothesis is that the diversity, abundance, and biomass of fish, and therefore fishing production, is higher in marine areas closer to mangrove systems, than in sites where the mangrove is absent. To test this hypothesis, three different estuarine systems are being surveyed. One has a heavily impacted mangrove forest, where the mangrove is mostly absent. Another zone has mangrove but is next to an urban development, and therefore with anthropogenic impacts. The third site has a healthy mangrove forest. The expected results are that the production of fish will be higher in marine areas closer to the healthy mangrove forests. An alternate result would be that the fish species do not require the mangrove forests to complete their life cycle, and coastal areas can function as well as nursery areas, as well as zones of growth, refuge and feeding. In this case the production would not be related to the presence or absence of mangrove forests in the vicinity. This study is important because current rates of mangrove deforestation are likely to have severe deleterious consequences for the ecosystem function and ﬁsheries productivity. If the mangrove forests are as important as they are consider to be, conservation efforts should protect these systems.
March 2012 Trip Report
Eric Knudsen travelled March 5–16, 2012 to the Instituto Ciencias del Mar y Limnologia, in Mazatlan, Sinaloa, MX. Activities included:
- Coordinating a grant from Northwest Marine Technology for donated marking supplies.
- Reviewing the study plan and providing consultation with Dr. Amezcua.
- Establishing the fish marking procedures and training the project team on the techniques.
- Testing the fish marking techniques on live, captive fish representing primary species to be marked in the field study (100% survival over the first three days).
- Participating in field work to refine field techniques and mark fish in one of six paired estuary and nearshore ocean fish marking zones (to monitor the movement of fish between zones).
- Delivering a seminar on EcoWB to the Instituto faculty and students.
- Reviewing several manuscripts previously produced from the scientists and graduate students.
- Reviewing a large data set for potential analysis of additional hypotheses.
- Visiting nearby land owned by UNAM that is slated for development of an experimental mangrove and fisheries research mesocosm.
- Strategizing on proposed expanded studies of the connections between mangroves and fisheries production and related restoration of mangrove forests.
- Visiting a local resort to research and negotiate plans for the 2014 Western Division AFS Annual Meeting
Broader Proposal – USAID Concept Paper
EcoWB is partnering with the Sustainable Fisheries Foundation, UNAM Instituto de Ciencias del Mary Limnologia, Plan Vivo, and the Mangrove Action Project in a proposal to advance research on the role of mangroves in fisheries production, strategies for restoring depleted mangroves, and a program to acquire carbon credits by planting mangroves. Read the concept paper here: Pre-proposal to USAID from SFF and EcoWB to restore mangroves and fisheries in Mexico – short version
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