Eduardo F. Balart

Instituto Politécnico Nacional

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Héctor Reyes‐Bonilla

Universidad Autónoma de Baja California Sur

David A. Paz‐García

Centro de Investigaciones Biológicas Margarita Salas

Juan Antonio De Anda-Montañez

Instituto Politécnico Nacional

Lía Celina Méndez-Rodríguez

Pronatura Noroeste

Rafael A. Cabral‐Tena

Center for Scientific Research and Higher Education at Ensenada

Tania Zenteno‐Savín

Pronatura Noroeste

Elisa Servière‐Zaragoza

Pronatura Noroeste

Lucía Campos-Dávila

Pronatura Noroeste

Martha Román-Rodríguez

Centro de Investigación y Desarrollo

José Luis Castro‐Aguirre

US Biologic (United States)

Cooperative Institutions

Instituto Politécnico Nacional

Centro de Investigaciones Biológicas Margarita Salas

Universidad Autónoma de Baja California Sur

Consejo Superior de Investigaciones Científicas

Pronatura Noroeste

Centro de Investigaciones Biológicas del Noroeste S.C.

Universidad Nacional Autónoma de México

Walter de Gruyter (Germany)

Universidad Autónoma de Baja California

Consejo Nacional de Humanidades, Ciencias y Tecnologías

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Species richness and composition of macroalgal assemblages of a disturbed coral reef in the Gulf of California, Mexico

Acta Botanica Mexicana (2020)

Alejandra Piñón‐Gimate Tonatiuh Chávez-Sánchez Alejandra Mazariegos‐Villarreal Eduardo F. Balart Elisa Servière‐Zaragoza

Abstract:Background and Aims: In September 2001, the coral reef of the San Lorenzo Channel, La Paz Bay, Gulf of California, Mexico, was affected by the stranding of the oil tank vessel “Lázaro Cárdenas II”. Soon afterwards, hurricane “Juliette” hit the area with strong winds and water movement, disturbing the reef again. After that, three zones could be observed in the reef: one directly impacted by the shipwreck, one indirectly impacted by the hurricane, which moved and accumulated the coral debris left by the shipwreck, and the third one, which was not impacted. Later, a monitoring program was established to determine the degree of recovery of macroalgal assemblages in both impacted zones compared with the non-impacted one.Methods: From February 2005 to December 2007, macroalgae were collected seasonally by scuba divers in the three zones. In each zone, three to five thalli of all conspicuous algae, five rocks and five fragments of dead coral covered with macroalgal turfs were collected. Species number and composition of macroalgae assemblages were compared between zones and between years.Key results: A total of 117 species were found, 70 belonged to the phylum Rhodophyta, 25 to Ochrophyta-Phaeophyceae, and 22 to Chlorophyta. Macroalgal species richness and composition of the impacted zones were not different from the control zone, even between years.Conclusions: Macroalgal assemblages in the San Lorenzo Channel coral reef were able to recover, regardless of the modification of the substrate caused by the stranding and the hurricane “Juliette” in 2001. Therefore, it is important to implement monitoring efforts in case of anthropogenic or natural disturbance to document the extension of damage, recovery of the communities, and propose mitigation strategies if necessary.

10.21829/abm127.2020.1653

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Fish Assemblages in Three Arid Mangrove Systems of the Gulf of California: Comparing Observations from 1980 and 2010

Bulletin of Marine Science (2012)

Francisco J López-Rasgado Sharon Z. Herzka Pablo del Monte‐Luna Elisa Servière‐Zaragoza Eduardo F. Balart

We evaluated the fish community structure in three mangrove systems from la Paz bay, southwestern gulf of California, mexico, during two annual cycles separated by 30 yrs (1980-1981 and 2009-2010). The three mangrove system have suffered different degrees of anthropogenic impact that range from relatively pristine (Balandra) to minor impacts from development (Zacatecas), and to highly modified (Enfermeria). A robust comparison between periods was attained by field sampling and identification of fishes using a museum collection. Species richness, density, biomass, shannon diversity, Pielou evenness, and average taxonomic distinctness (ATD) were computed using data collected during each period (12 monthly samples). During both periods, a few species dominated fish abundance in the three systems [Eucinostomus dowii (Gill, 1863), Diapterus brevirostris (Sauvage, 1879), and Mugil curema (Valenciennes, 1836)]. Enfermeria showed the most substantial changes in ecological indices; there were significant differences in mean monthly richness, density, and evenness over time. MDS and ANOSIM analyses revealed no differences in assemblage structure; however, SIMPER analysis indicated greater similarity in the assemblage structure overtime in enfermeria (38.06%) compared with Zacatecas (33.49%) and balandra (9.71%). ATD values were relatively consistent between periods at Balandra and Zacatecas. However, a few samples collected at Enfermeria had ATD values that indicated that the dominant species were closely related. This is likely due to the extensive habitat modification the system has suffered. Our study emphasizes the importance of long-term studies for understanding the changes in community structure in mangrove systems that are caused by habitat alteration.

10.5343/bms.2011.1111

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Sexual dimorphism in a broadcast spawning coral, Porites lobata

Research Square (Research Square) (2022)

Ricardo Mijail Pedraza-Pohlenz Eduardo F. Balart José de Jesús Adolfo Tortolero-Langarica Alma Paola Rodríguez‐Troncoso Michael E. Hellberg

Abstract Sexual selection in gonochoristic corals should vary with the sex of the colony, which may lead to sexual dimorphism. Because coral colonies possess a complex morphological architecture composed of subunits (corallites), the degree of coordinated change among these subunits may be subject to divergent selection between sexes. This study tested for sexual dimorphism in the corallites of a reef-building coral Porites lobata, a free-spawner, and compared this with dimorphism of massive congeners, the brooder P. panamensis . Corallite area for male P. lobata was 17% larger than for conspecific females, perhaps due to enabling greater sperm release and fertilization success. Phenotypic modularity analysis (i.e., ability of subsets of traits to vary in a coordinated manner) showed that the integration of skeletal traits was similar between sexes in P. lobata but higher in males than females in P. panamensis . High integration may result in a more stable corallite morphology, while lower integration may permit a greater capacity for plasticity. Our results demonstrate corallite traits can be sexually dimorphic in free-spawning corals and suggest that between-sex differences in the degree of corallite integration may vary with reproductive mode.

Sexual dimorphism

Lobata

Porites

Scleractinia

10.21203/rs.3.rs-1376851/v1

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Checklist of conspicuous reef fishes of the Bahía de los Ángeles region, Baja California Norte, Mexico, with comments on abundance and ecological biogeography

Zootaxa (2011)

Ismael Mascareñas‐Osorio Brad Erisman Jerry Moxley Eduardo F. Balart Octavio Aburto‐Oropeza

A first checklist of conspicuous reef fishes observed at 15 sites in the vicinity of Bahía de los Ángeles from 2008 to 2010 is presented. A total of 70 species representing 31 families were observed. Species composition was similar to well studied regions in the southern Gulf of California, in that most species had distributions that span the Tropical Eastern Pacific but species endemic to Mexico or the Gulf of California ranked highest in relative abundance, frequency of occurrence, and mean density. Several species with temperate geographic distributions were more abundant and frequent than on reefs in the southern Gulf. Large-bodied, predatory species such as sharks and the Gulf Grouper, Mycteroperca jordani, were rare or absent.

Tropical Eastern Pacific

10.11646/zootaxa.2922.1.7

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Acumulación de carbono orgánico total y carbonato de calcio en la zona de oxígeno mínimo del Pacífico nororiental mexicano

Alberto Sánchez O. González-Yajimovich Eduardo F. Balart B. Estela López-Ortiz Sergio Aguı́ñiga-Garcı́a

The distribution and preservation of the total organic carbon (TOC) and CaCO3 in marine sediments is important because its connection to the carbon cycle and the regulation of atmospheric CO2. Studies of the sinking, accumulation and carbon burial are limited and therefore it is necessary to know, identify and quantify the content of this element in marginal sediments. In the present work was determined the distribution and accumulation of TOC and CaCO3 in surface sediments with different conditions of oxygenation of the water column in the southwestern margin of the Peninsula of Baja California. The highest

Carbon fibers

Peninsula

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Cryptic isolation of Gulf of California shovelnose guitarfish evidenced by mitochondrial DNA

Marine Biology (2004)

Jonathan Sandoval‐Castillo Axayácatl Rocha‐Olivares Carlos Villavicencio-Garayzar Eduardo F. Balart

Species complex

mtDNA control region

Genetic divergence

Nucleotide diversity

10.1007/s00227-004-1378-7

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Citations (80)

Length-weight relationships of cryptic reef fishes from the southwestern Gulf of California, Mexico

Journal of Applied Ichthyology (2006)

Eduardo F. Balart Alonso González‐Cabello R. C. Romero-Ponce A. Zayas-Alvarez M. Calderon-Parra

Length–weight relationships of 33 cryptic reef fishes from the southwestern Gulf of California were estimated. The most common families were Gobiidae (seven species), Labrisomidae (four), Pomacentridae (three), and Tripterygiidae (three). These are the first length–weight parameters reported for 32 of these species. Specimens were sampled during a comparative ecological study of community structure of fish assemblages associated with coral heads, rocky walls, and artificial reefs in Bahía de La Paz, Baja California Sur. The b values varied between 2.63 and 3.61. New maximum length records for five of the species were established in the study.

Pomacentridae

Fringing reef

10.1111/j.1439-0426.2006.00670.x

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Citations (21)

Anatomical description of the Cortés damselfish Stegastes rectifraenum (Perciformes: Pomacentridae). Key structures for omnivore feeding

Revista Mexicana de Biodiversidad (2015)

Rosalía Aguilar‐Medrano Abraham Kobelkowsky Eduardo F. Balart

Pomacentridae is one of the most abundant fish families in coral and rocky reefs of tropical and temperate waters. Stegastes rectifraenum (Gill, 1862), as other members of the genus, is territorial and actively farm algae on its territory, helping in the regulation of the algal community structure and the reef productivity. It is endemic and one of the most abundant species along the Mexican Pacific coast. Even with its strong relationship with algae, this species is omnivorous. In this analysis, we present the first complete anatomical description of a species of Pomacentridae, focusing in one research question: which structures allow S. rectifraenum to have an omnivorous diet? Through the analysis of the skeletal, muscular and digestive systems, the anatomy of the species was described. The complex anatomy of S. rectifraenum shows a set of characters previously described for grazers (mandibular muscles), herbivorous (mandibular teeth), omnivorous with preference for algae (general skull osteology) and zooplanktivorous species (intestine shape and pharyngeal teeth). According to our results, S. rectifraenum is a grazer, omnivorous with preference for algae. Finally, the key character that facilitates S. rectifraenum access to a wider range of resources is the shape of the pharyngeal teeth, which can effectively grind, fasten and tear.

Pomacentridae

Damselfish

Omnivore

Perciformes

10.1016/j.rmb.2015.09.008

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Feasibility of a new fishery in Baja California, Mexico based on the red crabPleuroncodes planipes: preliminary economic evaluation and risk assessment

Aquatic Living Resources (2006)

Alfredo Hernández‐Llamas Eduardo F. Balart Germán Ponce‐Díaz Roberto Civera‐Cerecedo

A preliminary economic evaluation of the feasibility of establishing a fishery to process red crab meal (Pleuroncodes planipes) was conducted. Risk assessment indicated that a fishery of nine boats could operate with an average 1.53 benefit-cost ratio (B C−1) and annual net revenues (NR) of US$427 840, and that there is certainty of obtaining economic profit in every season, with a B C−1 > 1 and NR > 0. Total catch and average catch per trip could be reduced from a total baseline catch of 10 328 tons (1735 t meal) to 6061 (1844 t meal), and from a baseline catch per trip of 11.4 t (4.78 t meal) to 6.73 tons (4.85 t meal) without economic losses. There was no possibility for profit when total catch and average catch per trip were, respectively, lower than 5365 t (1648 t meal) and 5.96 t (4.71 t meal). For a single-fishing trip operation, average B C−1 was 1.5 and NR was US$480. We determined that there was a confidence level of 84% to generate profits. To guarantee profits, a catch of 13.5 t per trip (1.35 t meal) should be obtained. Single trips catching less than 3.3 t (0.94 t meal) cannot make a profit. Sensitivity analysis indicated that plant processing efficiency for converting fresh red crab to meal, catch per trip, and sales price of red crab meal were most important in determining B C−1 and NR values. Plant efficiency constitutes the main element that needs to be optimized, particularly management practices to preserve fresh catch quality. A low sensitivity to costs for processing suggests the possibility of negotiating a higher price and the opportunity for processing plants to venture into processing of red crab meal.

Net profit

10.1051/alr:2006015

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Living on the edge: Diadema mexicanum in the upper Gulf of California

Marine Biodiversity (2016)

David A. Paz‐García Omar Valencia‐Méndez Omár Domínguez‐Domínguez Eduardo F. Balart

10.1007/s12526-016-0539-5

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Citations (4)