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Tectonics ◽  
2022 ◽  
Author(s):  
Justin T. Higa ◽  
Nathan D. Brown ◽  
Seulgi Moon ◽  
Joann M. Stock ◽  
Leah Sabbeth ◽  
...  

Author(s):  
Eduardo Huesca-Pérez ◽  
Edahí Gutierrez-Reyes ◽  
Luis Quintanar

ABSTRACT The Gulf of California (GoC) is a complex tectonic boundary that has been instrumented in the past several decades to record broadband seismograms. This volume of data has allowed us to study several source parameters systematically. Before, only a few source parameters of earthquakes greater than magnitude five had been studied in the GoC area. We re-examined the focal mechanisms of several earthquakes in the southern GoC that occurred over the last 20 yr using local–regional distance broadband seismograms. These focal mechanisms were then used as input data to retrieve the time–space history of the rupture for each earthquake. This work contributes to the study of 25 rupture-process models computed with the method proposed by Yagi et al. (1999). To investigate more about the nature of the seismicity in the GoC, we also calculated the non-double-couple component of moment tensors for 45 earthquakes. Previous studies (e.g., Ortega et al., 2013, 2016) have shown that non-double-couple components from moment tensors in this region are associated with complex faulting, suggesting that oblique faults or several parallel faults are interacting simultaneously. Our results show that, at least for moderate earthquakes (5 < M < 6), rupture processes in the GoC show a complex interaction between fault systems. It is revealed on the important contribution of non-double-couple component obtained in the full moment tensor analysis.


Fishes ◽  
2022 ◽  
Vol 7 (1) ◽  
pp. 15
Author(s):  
Ricardo Urías-Sotomayor ◽  
Guillermo Rodríguez-Domínguez ◽  
José Adán Félix-Ortiz ◽  
Gilberto G. Ortega-Lizárraga ◽  
Horacio A. Muñoz-Rubí ◽  
...  

A stock reduction analysis (SRA) of bigeye croaker Micropogonias megalops was performed based on commercial catch data. SRA solutions were restricted to a 2011 bigeye croaker stock biomass estimate of 14,412 t. The viable solution indicated a reduction in stock of 73.6% from 1983 to 2020 with an initial biomass of 22,186 t. In addition, a possible effect of hyperstability of the stock was evaluated by applying different versions of the Cobb–Douglas catch function. The most probable function based on a multi-model selection procedure was the one wherein the catch does not depend on biomass and is directly proportional to the applied fishing effort of small boats (~7 m) and vessels (~24 m). This situation suggests that in a free access regime, fishing can deplete the resource until it collapses, without observing a significant reduction in its catches until the event is very close.


2022 ◽  
Vol 58 (1) ◽  
Author(s):  
Claire Vergneau-Grosset ◽  
Raphaëlle Boudreau ◽  
Fabio Favoretto ◽  
Guy Beauchamp ◽  
Anne-Josée Chicoine ◽  
...  

2022 ◽  
Vol 19 (1) ◽  
pp. 1-27
Author(s):  
Roberto Velázquez-Ochoa ◽  
María Julia Ochoa-Izaguirre ◽  
Martín Federico Soto-Jiménez

Abstract. The isotopic composition of carbon in macroalgae (δ13C) is highly variable, and its prediction is complex concerning terrestrial plants. The determinants of δ13C macroalgal variations were analyzed in a large stock of specimens that vary in taxa and morphology and were collected in shallow marine habitats in the Gulf of California (GC) with distinctive environmental conditions. A large δ13C variability (−34.6 ‰ to −2.2 ‰) was observed. Life-forms (taxonomy 57 %, morphology and structural organization 34 %) explain the variability related to carbon use physiology. Environmental conditions influenced the δ13C macroalgal values but did not change the physiology, which is most likely inherently species-specific. Values of δ13C were used as indicators of the presence or absence of carbon concentrating mechanisms (CCMs) and as integrative values of the isotope discrimination during carbon assimilation in the life cycle macroalgae. Based on δ13C signals, macroalgae were classified in three strategies relative to the capacity of CCM: (1) HCO3- uptake (δ13C > −10 ‰), (2) using a mix of CO2 and HCO3- uptake (-10<δ13C > −30 ‰), and (3) CO2 diffusive entry (δ13C < −30 ‰). Most species showed a δ13C that indicates a CCM using a mix of CO2 and HCO3- uptake. HCO3- uptake is also widespread among GC macroalgae, with many Ochrophyta species. Few species belonging to Rhodophyta relied on CO2 diffusive entry exclusively, while calcifying macroalgae species using HCO3- included only Amphiroa and Jania. The isotopic signature evidenced the activity of CCM, but it was inconclusive about the preferential uptake of HCO3- and CO2 in photosynthesis and the CCM type expressed in macroalgae. In the study of carbon use strategies, diverse, species-specific, and complementary techniques to the isotopic tools are required.


2022 ◽  
Vol 174 ◽  
pp. 113244
Author(s):  
B. Gil-Manrique ◽  
J. Ruelas-Inzunza ◽  
M.M. Meza-Montenegro ◽  
S. Ortega-García ◽  
L. García-Rico ◽  
...  

The Holocene ◽  
2021 ◽  
pp. 095968362110665
Author(s):  
Fernando Arenas ◽  
Harumi Fujita ◽  
Alberto Sánchez

Oceanic characteristics of the Holocene are used to understand climatic patterns and phenomena that affect marine and human communities. Likewise, past marine conditions can be reconstructed from surface sea temperature (SST), using stable oxygen isotopes in bivalve shells. The objective of this study was to calculate Holocene summer SSTs for La Paz Bay, by analyzing δ18O of 14C dated bivalve shells ( Chione californiensis) from a Holocene camp site located in Cañada de La Enfermería, Baja California Sur, México. Aragonite was extracted from the shells’ umbo, representing the summer growth season during the first year of life. δ18O value of C. californiensis is −1.9 ± 0.1‰ at present, and varied between −1.3‰ and −2.6‰ during the last 9 ky. In 9469 BP, 8396 BP, and 7708 BP, δ18O values were similar to those of the present. In 7857 BP, 7805 BP, and 7804 BP, δ18O was 18O depleted (0.6–0.9‰), indicating warmer summer SSTs versus the present. In 7070 BP, 6945 BP, and 2087 BP, δ18O was enriched in 18O (0.3–0.4‰), suggesting colder SSTs versus the present. This study coincides with other paleotemperature studies for the region and allows us to address the effect of changing SST on this marine resource, its use by human communities of the past, and its effects on human presence in the area with respect to climate variability.


Author(s):  
Wei Ye ◽  
◽  

The rapid social-economic development of the countries bordering the South China Sea has resulted in increased marine pollution of the region, yet little study has been carried out on marine pollution in the region. This article is one of the first few attempts among existing literature to understand marine pollution in the South China Sea as a large marine ecosystem and its implications for sustainability. We have conducted systematic literature reviews for marine pollution in the South China Sea and three other regional seas/large marine ecosystems, namely, the Gulf of California, the Mediterranean Sea, and the North Sea with the assistance of CiteSpace. By comparison of studies in the three regional seas, the research of marine pollution in the South China Sea only touches on the impact of microplastics, and existing literature in the area is less efficient in the study of impacts of modern pollution on marine organisms and the uncertain bioaccumulation effect on humanity. Therefore, it is recommended that researchers in the region cooperate to conduct a holistic study of ocean pollution, and study of biological impacts of pollution on marine organisms should be strengthened.


Animals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 19
Author(s):  
Pablo Mora-Zamacona ◽  
Felipe N. Melo-Barrera ◽  
Víctor H. Cruz-Escalona ◽  
Andrés F. Navia ◽  
Enrique Morales-Bojórquez ◽  
...  

The age and growth rate of the giant electric ray, Narcine entemedor, was estimated using growth bands deposited in the vertebral centra of 245 specimens. Differences in size and age distribution were found between the sexes, a pattern that suggests the annual deposition of band pairs, possibly occurring in April. Multimodel inference and back-calculation were performed to three age data sets of females considering their reproductive cycle and time of capture, among which the von Bertalanffy growth function was found to be the most appropriate (L∞ = 81.87 cm TL, k = 0.17 year−1). Our research supports the idea that age can be determined via biological features such as birth date and growth band periodicity. We concluded that N. entemedor is of a moderate body size, moderate longevity and is a fast-growing elasmobranch species.


Crustaceana ◽  
2021 ◽  
Vol 94 (11-12) ◽  
pp. 1407-1427
Author(s):  
Carlos A. Arvizu-Merín ◽  
Juan F. Arzola-González ◽  
José A. Félix-Ortiz ◽  
Guillermo Rodríguez-Domínguez ◽  
Emigdio Marín-Enríquez ◽  
...  

Abstract The relative growth of Calappa convexa can be used to identify dimorphism or morphological change related to sexual maturation. The carapace width (CW) against width and length of the propodus of the right and left cheliped were tested to obtain a coefficient of allometry. CW against total wet weight WT values were analysed for length-weight relationships (LWR). Relative growth was analysed by a multi-model approach. Five models were tested and the best was selected due to the greater weight of the Akaike criterion (). Significant differences between sexes were found in CW (, ) and WT (, ). The negative or positive allometry varied according to the morphometric relationship and sex. No real winner model () was observed in the LWR analysis under a multi-model approach. The average model estimated a breakpoint at 118 mm CW in males and 132 mm CW in females.


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