No full-text available
To read the full-text of this research,
you can request a copy directly from the authors.
First occurrence of the Patagonian blennie, Eleginops maclovinus (Cuvier, 1830) and the silverside Odontesthes smitti (Lahille, 1929), in a temperate south-western Atlantic coastal lagoon
Journal of Applied Ichthyology
... As a filter feeder, the species has a key position between the primary producers and the secondary consumers on the trophic chain. High densities of Brazilian menhaden eggs and larvae have been documented (Bruno et al., 2013) when the spawning events take place, as well as high densities of juvenile when the recruitment occur in estuaries (Gonzales-Castro et al., 2009a). Also, B. aurea could lend an important role in the exchange of organic matter between the freshwater environment and the sea, as B. patronus Goode, 1878 does in the Northewestern Atlantic (Deegan, 1993;Garman & Macko, 1998). ...
... Moreover, the authors found high densities of early juveniles in summer and autumn. Furhermore, Bruno et al. (2013) reported high density of eggs and larvae of B. aurea, in Zone I (sensu González-Castro et al., 2009a), which basically is the sample site of the present study. Here, B. aurea was collected in Mar Chiquita lagoon almost every month (with the exception of June, July and August). ...
Reproductive biology of the Brazilian menhaden, Brevoortia aurea (Clupeiformes), was studied in Mar Chiquita Coastal Lagoon. Its abundance was analysed in relation to environmental variables, and the main biological-reproductive parameters were estimated: size at first maturity, batch and relative fecundity, frequency distribution of oocyte diameters and gonadosomatic index (GSI). Moreover, its reproductive cycle was analysed histologically. Samples were collected from May 2012 to April 2013. Once the spawning period was detected, extra samples were added (October and November 2013). The specimens were caught with gillnets, at a distance of 2,300 meters from the mouth of the lagoon. The highest abundances were observed in the months of October and November. Both macroscopic and microscopic analysis allowed to confirm that in these months the saraca spawn in the area mixo-eurihaline of the lagoon. Females were recorded in the five phases of ovarian development. Histological and frequency distribution of oocyte diameters characterized this species as a batch spawner with undetermined fecundity. The fecundity varied between 19,900 and 178,508 oocytes/female. Relative fecundity ranged between 41 and 381 oocytes/g female ovary free. The size at first maturity was estimated on 277 and 265 mm total length for females and males, respectively.
... Barros et al. 2005) and the increasing advance of warm waters from the Brazil current towards the Patagonian shelf in recent years (Chidichimo et al. 2022) would also serve to curtail the potential invasion of salmonids in the future. In summary, we conclude that the presence of anadromous salmonids in the temperate waters of the La Plata River is an occasional phenomenon that has been previously recorded for other Patagonian anadromous species in the past, such as the Patagonian lamprey (Geotria macrostoma, Riva Rossi et al. 2020) and the Patagonian blennie (Eleginops maclovinus, González-Castro et al. 2013). Given the scale of these movements, it is plausible that these occurrences involve stray specimens carried by the Malvinas cold current. ...
... Unfortunately there is a lack of historical data on trends in temperature variations or shifts in other environmental variables in the southwestern Atlantic (Bovcon et al., 2011). Absence of historical data for the area complicates any causal assessment of these observations; however, species of the genus Lophius in the North Atlantic have increased their range northward in response to rising water temperatures due to climate change (Johnson, 2011;Perry, Low, Ellis, & Reynolds, 2005 (2005) and Gonzalez-Castro, Delpiani, Bruno, and Dıaz de Astarloa (2013) suggest that new records in the Southwest Atlantic indicate true southward expansions of warm temperate species favored by a possible increase in water temperature. According to Hearne (2009) and Bovcon et al. (2011), in addition to other species from warm temperate waters, the presence of L. gastrophysus off the coast of Patagonia could be considered as an example of this growing trend. ...
We report the presence of two specimens of blackfin goosefish Lophius gastrophysus in coastal waters of the San Jorge Gulf. These records extend its range distribution to 45°53’S. This species occurs in the Western Atlantic from 39° N to 39° S. Both specimens were caught as bycatch in the shrimp fishery (Pleoticus muelleri) in August 2009 and November 2010. The first specimen was captured at 45°53’S - 67°07’W and 87 m depth. The second specimen was caught at 60 m depth and close to the coast (45°08’S; 66°07’W). This latter specimen was a post-spawning stage female of 72 cm in total length. These records can be explained as a result of two possible hypothesis: an increase in sampling efforts and/or the influence of climate change on water temperatures. The catches of the two specimens of this species represent the southernmost first records in southwestern coastal waters.
... Salinity fluctuates over a wide range between 0 and 36 PSU, and it is extremely variable and influenced by the freshwater volume present in the lagoon, the tide, and the wind direction/intensity [23]. The fish composition of Mar Chiquita coastal lagoon has been studied during the last fifteen years and several fish species have been reported to make extensive use of the lagoon, in a permanent, seasonal or occasional way [8][9][10][24][25][26][27][28]. Moreover, Gonzá lez-Castro et al. [9] not only analysed the spatial and temporal patterns in fish assemblage composition and relative abundance of fish species, but also evaluated the relative contribution of some environmental variables over these patterns. ...
Atherinopsidae are widespread freshwater and shallow marine fish with singular economic importance. Morphological, genetical and life cycles differences between marine and estuarine populations were already reported in this family, suggesting ongoing speciation. Also, coexistence and interbreeding between closely related species were documented. The aim of this study was to infer boundaries among: (A) Odontesthes bonariensis and O. argentinensis at species level, and intermediate morphs; (B) the population of O. argentinensis of Mar Chiquita Lagoon and its marine conspecifics. To achieve this, we integrated, meristic, Geometrics Morphometrics and DNA Barcode approaches. Four groups were discriminated and subsequently characterized according to their morphological traits, shape and meristic characters. No shared haplotypes between O. bonariensis and O. argentinensis were found. Significative-meristic and body shape differences between the Mar Chiquita and marine individuals of O. argentinensis were found, suggesting they behave as well differentiated populations, or even incipient ecological species. The fact that the Odontesthes morphotypes shared haplotypes with both, O. argentinensis and O. bonariensis, but also possess meristic and morphometric distinctive traits open new questions related to the origin of this morphogroup.
... In both cases the appearance of this species in estuarine waters can also be explained by the environmental condition at the moment of capture. The occasional occurrence of fish in Mar Chiquita lagoon is well documented (Díaz de Astarloa et al. 2000;González Castro et al. 2006;Bruno et al. 2011;González Castro et al. 2013). Salinity range in Mar Chiquita coastal lagoon shows a variable pattern depending on wave tide, speed and direction of wind and fresh water volume belonging from streams. ...
We report the first record of Porichthys porossisimus and Macrodon atricauda in the Mar Chiquita coastal lagoon,
Argentina. Morphometric and meristic data of collected specimens are also presented in order to validate its taxonomic
identification.
Climate change, fishing, and invasion by alien species are the drivers of global change that mainly affect Patagonian marine fish assemblages. In this chapter, we reconstructed the coastal fish assemblages and their changes in richness and composition in three areas at northern, central, and southern Patagonia between 1970 and 2020. Overall, there was an increase in fish richness (30 species) driven by an influx of species from warmer waters in northern and central Patagonia and by the invasion of alien species at central and southern Patagonia. Such a trend is consistent with the global pattern of tropicalization in temperate waters described for other regions and recent evidence of change in the sea surface temperature (SST) up to 48°S latitude. We detected only two local extinctions of skates from warm waters that disappeared from the northern area. A large number of fishes (30 species) diminished their frequency of occurrence. A total of 20 species of commercial importance, 7 of which were elasmobranchs, were the most affected by partial losses. Future research is needed to understand the functional role of the species arriving or retracting and the consequences of such changes on ecosystem functioning.
The presence of ladyfish Elops smithi in Patagonian waters is a new addition to the ichthyological fauna of the Argentinean Sea. This record represents a southward ex-tension of its known distribution by 8 degrees of latitude, ~1500 km. It is another ex-ample of the more frequent arrival of tropical or subtropical fish species to Patagonian waters
In this note, we report the occurrence of H. niveatus at two new locations in Argentine waters, extending its range c.1000 km southwards of the previously reported limit.
La présence de six exemplaires du mulet, Mugil cure m a Va l e nciennes, 1836, est signalée dans la lagune côtière Mar Chiquita, A rgentine (37º32’S-57º19’W). C’est le signalement le plus méridional pour l’espèce dans l’Atlantique sud-ouest et le premier dans des eaux argentines. Les caractères morphométriques et méristiques des six exemplaires sont donnés.
The present paper reviews the systematics of marine and freshwater species of Chilean silversides. Resulting from a phylogenetic systematic revision of the order Atheriniformes the traditional concept of the family Atherinidae is that of a polyphyletic assemblage. The New World silversides, Menidiinae and Atherinopsinae, are part of the family Atherinopsidae. Atherinopsinae is composed of two tribes with antitropical distribution (North America: Atherinopsini; South America: Sorgentinini). Sorgentinini is distributed in marine and freshwaters across the southern cone of South America, from northern Peru and southern Brazil to the southern tip of Tierra del Fuego, including the Falkland Islands in the Atlantic and the Juan Fernandez Archipelago in the Pacific. The phylogenetic hypothesis of relationships among species is based on a cladistic analysis using parsimony. There are at least 13 atheriniform species in Chile of the genera Notocheirus (Notocheiridae), Atherinella, Basilichthys, and Odontesthes (Atherinopsidae). Notocheirus hubbsi is under study awaiting more specimens to determine whether its spiny head morphology is evidence of sexual dimophism or a new species. The only member of the subfamily Menidiinae registered in Chile is Atherinella nocturna, appearing occasionally in the north in association with El Niño S.O. events. The majority of silverside species in Chile belong to the subfamily Atherinopsinae. Basilichthys is composed of at least five species, three of which are present in Chile: B. microlepidotus, B. australes, and B. sp., the latter species belonging to the semotilus group and found in
We report the occurrence of a mature male Syngnathus folletti in the inlet channel of Mar Chiquita coastal lagoon (37°44′S 57°25′W, Buenos Aires, Argentina). This record constitutes the southernmost report for the species. Mar Chiquita coastal lagoon is characterized by mudflats surrounded by a large cord-grass area but not by grass beds which are seen to be a suitable habitat for S. folletti. Therefore, oceanic winds that allow warmer northern waters to approach the coast of Argentina could be the cause of the presence of the species.
Mar Chiquita, an irregularly shaped brackish-water coastal lagoon, is located in the Buenos Aires province of Argentina and considered since 1996 by the Coordination Council of the Man and Biosphere Program of UNESCO as a World Reserve of Biosphere. The present paper aims to study both the spatial and temporal variation of fish composition in this coastal lagoon and the influence of some environmental variables on the relative abundance of the main fish species. Monthly sampling surveys over a two-year period in three different areas were conducted, using a beach-seine net and three monofilament-gill nets with different mesh size. Twenty-eight species belonging to four bio-ecological categories were identified, five of them are new records for Mar Chiquita fish community. The correspondence analysis showed strong relationships between high salinity range and the abundance of Brevoortia aurea, Cynoscion guatucupa and Pomatomus saltatrix. Conversely, low salinity range corresponded to high abundance of Mugil platanus and Odontesthes argentinensis. High temperatures were corresponded with abundance of Micropogonias furnieri and Brevoortia aurea. In contrast, high abundance of both Odontesthes argentinensis and Oligosarcus jenynsii were corresponded to low temperatures. Brevoortia aurea, Mugil platanus and Odontesthes argentinensis were the most abundant species, representing more than 80% of the total capture. The group of estuarine-nondependent-marine fish presented the highest species richness. Estuarine-dependent-marine species presented for both juveniles and adults specimens the highest abundance values.
Trachinotus carolinus (Linnaeus, 1766) is reported for the first time from northern Argentinean waters, substantially farther south than its usual area of occurrence. Morphometric and meristic characteristics of the seven specimens are provided. The infrequent occurrences in this region of fishes with tropical and subtropical affinities is discussed.
As the number of fish reproduction studies has proliferated, so has the number of gonadal classification schemes and terms. This hasmade it difficult for both scientists and resourcemanagers to communicate and for comparisons to be made among studies.We propose the adoption of a simple, universal terminology for the phases in the reproductive cycle, which can be applied to all male and female elasmobranch and teleost fishes. These phases were chosen because they define key milestones in the reproductive cycle; the phases include immature, developing, spawning capable, regressing, and regenerating. Although the temporal sequence of events during gamete development in each phase may vary among species, each phase has specific histological and physiologicalmarkers and is conceptually universal. The immature phase can occur only once. The developing phase signals entry into the gonadotropin-dependent stage of oogenesis and spermatogenesis and ultimately results in gonadal growth. The spawning capable phase includes (1) those fish with gamete development that is sufficiently advanced to allow for spawning within the current reproductive cycle and (2) batch-spawning females that show signs of previous spawns (i.e., postovulatory follicle complex) and that are also capable of additional spawns during the current cycle. Within the spawning capable phase, an actively spawning subphase is defined that corresponds to hydration and ovulation in females and spermiation in males. The regressing phase indicates completion of the reproductive cycle and, formany fish, completion of the spawning season. Fish in the regenerating phase are sexually mature but reproductively inactive. Species-specific histological criteria or classes can be incorporated within each of the universal phases, allowing for more specific divisions (subphases).
Peces Marinos de Argentina. Biología, distribución, pesca
- M. B. Cousseau
- R. G. Perrotta
Scrawled cowfish, Acanthostracion quadricornis (Tetraodontiformes: Ostraciidae), collected from Argentine waters
- Díaz de Astarloa
Boletín climatológico. Programa de vigilancia del clima en la Argentina y región subantártica adyacente 24
- M M Skansi
Skansi, M. M., (Ed.), 2012: Boletı´n climatolo´gico. Programa de vigilancia del clima en la Argentina y regio´n subanta´rtica adyacente,
24, pp. 19.
Facultad de, Ciencias Exactas y Naturales
- Author 's Address
Author's address: Mariano Gonzaíez-Castro, Instituto de Investigaciones Marinas y Costeras (IIMyC-CONICET),
Facultad de, Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata (UNMdP),
Funes 3350, B7602AYL, Mar del Plata, Argentina.
E-mail: gocastro@mdp.edu.ar
942
M. González-Castro et al.
2006: Fishes of the World
- J S Nelson
Nelson, J. S., 2006: Fishes of the World, 4th edn. John Wiley &
Sons, New York, ISBN-10: 0471250317. pp. 601.