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1.
Claudia Alejandra Reyes-Valdez Gorgonio Ruiz-Campos Faustino Camarena-Rosales José Luis Castro-Aguirre Giacomo Bernardi 《Reviews in Fish Biology and Fisheries》2011,21(3):543-558
The population morphometric variation of the endangered freshwater killifish (Fundulus lima) was evaluated and compared with that of its euryhaline coastal relatives (F. parvipinnis parvipinnis and F. p. brevis) on the basis of 384 specimens from the Baja California peninsula, Mexico. Forty five standardized body distances were compared
by means of discriminant function analysis (DFA). Sixteen body distances were significant to distinguish two groups of populations
for F. lima: a first group represented by the Bebelamas and San Javier basins, and second group composed by the basins of San Ignacio,
La Purísima, San Luis, San Pedro and Las Pocitas. When all freshwater and coastal populations were compared, the southernmost
population of F. lima (Las Pocitas) showed a higher morphometric similarity with the southern coastal subspecies (F. p. brevis), while another southern population (San Pedro) had an intermediate position between the freshwater and coastal forms. This
study suggests the presence of five evolutionary units (three freshwater and two coastal) for the genus Fundulus in the Baja California peninsula. 相似文献
2.
Varela-Romero Alejandro Ruiz-Campos Gorgonio Yépiz-Velázquez Luz María Alaníz-García Jorge 《Reviews in Fish Biology and Fisheries》2002,12(2-3):157-165
In order to better determine the currentstatus of desert pupfish populations (Cyprinodon macularius macularius) in the LowerColorado River Basin of Mexico, bimonthly fishsampling and habitat evaluations were carriedout from September 1996 to August 1997 in sixlocalities of Baja California and Sonora.Desert pupfish were collected using minnowseines and traps. Four sampling sites are inSonora, in shallow marginal habitats of theCiénega Santa Clara (Hunters' Camp, Outletof the Welton-Mohawk channel, El Doctor andFlor del Desierto) and two are in BajaCalifornia (Cerro Prieto and streams south ofCerro Prieto). The most abundant fish speciessampled was native desert pupfish (C.macularius, 59%) followed by sailfin molly(Poecilia latipinna, 19%), redbellytilapia (Tilapia cf. zilli, 10%) and western mosquito fish (Gambusiaaffinis, 7%). Significant temporalfluctuations in distribution and abundance ofdesert pupfish populations, as previouslyreported for these populations, was againdocumented. The main anthropogenic factorsaffecting distribution and abundance of desertpupfish populations in the Mexican portion ofthe Lower Colorado River Basin are progressivealteration of aquatic and riparian habitats, aswell as presence of exotic fishes that havecaused the displacement or elimination ofnative fish populations. Both habitat andpresence of the desert pupfish populations inthe study area are controlled by theperiodicity, quality and volume of dischargesinto the Mexican portion of the basin from theUnited States. 相似文献
3.
Francisco J. García-De León Andrés I. Hernández Sandoval Fernando Contreras-Catala Laura Sánchez-Velasco Gorgonio Ruiz-Campos 《Environmental Biology of Fishes》2018,101(1):167-180
A priority issue in ecology and biogeography is understanding the patterns in species diversity and the causal factors of their distribution, which allows the generation of information for conservation strategies. The longitudinal distribution of fishes and their relationships with environmental variables were studied in the Guayalejo-Río Tamesí system (northeastern Mexico) from February 2000 to July 2001. A total of 5918 fish were caught in 27 collections along an altitudinal gradient in the main river course, from high mountain (1500 masl) to coastal plain near Tampico. Forty-three native and five exotic species, belonging to 35 genera in 23 families, were identified. Cluster analyses identified four major fish habitats in the river system. A distinctive euryhaline marine fish habitat (1) occurs near the mouth with native and two exotic species. Two other habitats consist essentially of freshwater fish species that are distributed along the longitudinal gradient. One of these habitats (habitat 4) shows greater diversity, as per the Shannon index value, and also includes amphidromous fish, in addition to two exotic freshwater fish; the other (habitat 2) includes freshwater, euryhaline and three exotic species. The changes in the frequency of occurrence and the abundance of Gambusia vittata, Astyanax mexicanus, and Xiphophorus variatus contribute to explaining differences between these habitats. Another habitat (3) is represented by two sampling sites located near the mouth and consist of freshwater and euryhaline fish and three exotic cyprinids with broad salinity tolerance. The low abundance and richness of exotic species suggest little impact on native fish fauna in this river. The fish assemblage of the Guayalejo-Tamesí river system species changes along a longitudinal gradient with the addition, replacement and presence of indicator species. Upstream fish fauna is mostly composed of freshwater species, some of them generalists that inhabit the entire longitudinal gradient, others that are restricted to certain sites, and the remainder of species is an assemblage composed of a mixture of euryhaline freshwater and marine species near the mouth. 相似文献
4.
Acosta Zamorano D Ruiz Campos G Andreu Soler A Reyes Valdez CA 《Revista de biología tropical》2011,59(4):1669-1678
Fundulus lima inhabits river drainage systems and is threatened after the introduction of cichlids in the area. To support conservation programs, the spatial and temporal variation of the diet composition of this endangered killifish, was determined in two oasis systems of Baja California Sur, Mexico (San Ignacio and La Purisima river drainages), during rainy and dry seasons. F. lima was captured by using passive and active capture techniques. A total of 192 stomach contents of F. lima was analyzed. The contribution of each prey item in the diet composition was quantified by means of the indices of occurrence frequency (% OF), numerical (% N) and volume (% V) percentages. The relative importance of each prey item was determined according to the percentage of the Relative Importance Index (% RII). The similarity of the diet was calculated between hydrological basins (populations combined by basin), seasons (rainy versus dry months), sexes and size classes, by using Schoener's resource overlap index. We used two ecological indices to determine the type of feeding strategy exhibited by the fish: (1) niche breadth of Levins and (2) proportional similarity of Feisinger. Sand was the most abundant item in the stomach content of killifishes from both drainages (39% and 47%, respectively). Diet composition was similar for both drainages (74%) as well as among their respective size classes; however, it was different between sexes. In both drainages, F. lima predated mainly on diatom algae, dipterous and trichopteran larvae, and fish scales during the dry season; while it preferred dipterous larvae, filamentous algae and ostracods in the rainy season. A feeding strategy of opportunist type was exhibited by F. lima during the rainy season, changing to specialist type during the dry season. This information will be the basis for future investigations related to the conservation of this endangered species and its habitat. 相似文献
5.
Fopius arisanus is unusual among hymenopterous parasitoids in males having an obligatory premating period. We confirmed Hagen's (1953) view that sperm takes several days to migrate from the testes to the seminal vesicles. Males mated for the first time only 4 days after emergence, the time that sperm was first ever recorded in the seminal vesicles. In the field, we studied the sexual maturation of F. arisanus males in relation to their behavior. In general, sexually immature males were found in male-only swarms that persisted over several days in host tree canopies. Mature males were usually found in loose aggregations in the vegetation beneath host trees. Females entered these loose aggregations and were mated, whereas they were generally absent from swarms in the canopy. Swarming is therefore apparently not a primary component of the sexual communication system of the species. We describe, for the first time in F. arisanus, the behavioral sequence that accompanies the intersexual communication that leads to mating. Males probably release a volatile chemical that attracts females from a distance, but we have only circumstantial evidence for this. We also postulate that males may form aggregations to amplify the effects of this distance attractant. In the vicinity of males, females release a pheromone that attracts males, a process we demonstrated with female-baited sticky traps. 相似文献
6.
G. Ruiz-Campos A. F. González Acosta J. De La Cruz Agüero 《Zeitschrift fur angewandte Ichthyologie》2006,22(4):314-315
Length–weight and length–length relationships were estimated for 10 freshwater, estuarine and marine fish species caught at the mouths of coastal sterams from northwestern Baja California (Mexico). The parameter b estimated by nonlinear least squares of weight and length data, ranged from 2.50 to 3.61. Size conversions (calculated total length from standard length) can be used in fishery for understanding several aspects of population dynamics. 相似文献
7.
Morphometric variation of wild trout populations from northwestern Mexico (Pisces: Salmonidae) 总被引:8,自引:1,他引:7
Ruiz-Campos Gorgonio Camarena-Rosales Faustino Varela-Romero Alejandro Sánchez-González Sergio Rosa-Vélez Jorge De La 《Reviews in Fish Biology and Fisheries》2003,13(1):91-110
Morphometric variation of 17 wild troutpopulations of the genus Oncorhynchusfrom northwestern Mexico was analyzed.We used 25 standardized morphometric characters following a box truss protocol. In thediscriminant function analysis (DFA) of theexamined specimens (n = 214), grouped bydrainage, the canonical root 1 explained 88.1%of the total variation. Sixteen linearcharacters allow distinguishing O. mykissnelsoni (Sierra San Pedro Mártir [SSPM])from O. chrysogaster and O. mykisssspp. (Sierra Madre Occidental [SMO]). Twodistinctive groups of populations wererecognized on the basis of the squaredMahalanobis' distances, one for the SSPM (O. m. nelsoni) and the other for the SMO. Thelatter group is divided into four subgroups:(1) O. chrysogaster (Río Fuerte andRío Culiacán) and O. mykiss ssp.(Río Piaxtla); (2) O. mykiss sspp.(Río San Lorenzo, Río Baluarte, andRío Acaponeta); (3) O. mykiss sspp.(Río Yaqui and Río Mayo); and (4) O. chrysogaster (Río Sinaloa). In the DFAamong populations within each taxon, thecanonical variable 1 accounted for 41.8% ofthe total variation for O. m. nelsoni,59.4% for O. chrysogaster, and 43.8%for O. m. sspp. 相似文献
8.
Luis Hernández Alejandro M. Maeda-Martínez Gorgonio Ruiz-Campos Gabino Rodríguez-Almaraz Fernando Alonzo-Rojo Juan Carlos Sainz 《Biological invasions》2008,10(7):977-984
The red crayfish Procambarus clarkii, which is native to southcentral USA and northeastern Mexico, has been successfully introduced into several countries around
the world. This study documents the geographic expansion of the exotic red crayfish in Mexico and discusses the consequence
of a greater propagation of this species in Mexican inland waters. New state records of this crayfish in the Baja California
peninsula and in the states of Durango and Sinaloa indicate its progressive dispersion. The propagation of P. clarkii in Mexico has been caused mainly by human introduction, but it is also facilitated because of the species’ tolerance to an
ample range of environmental conditions. Because of the invasive capability of P. clarkii, we suspect that this exotic species is competing for habitat and food with native freshwater shrimp of the genus Macrobrachium in many sites of northern Mexico. 相似文献
9.
Faustino Camarena-Rosales Gorgonio Ruiz-Campos Jorge De La Rosa-Vélez Richard L. Mayden Dean A. Hendrickson Alejandro Varela-Romero Francisco J. García de León 《Reviews in Fish Biology and Fisheries》2008,18(1):33-45
The variation and composition of Mexican wild trout mitochondrial DNA haplotypes throughout northwestern Mexico was determined
by means of polymerase chain reaction–restriction fragment polymorphism analysis (PCR–RFLP), of one region of mitochondrial
DNA between cytochrome b and the D-loop. This analysis was based on 261 specimens taken in 12 basins and four hatcheries from
northwestern Mexico. From 23 haplotypes, 15 wild trout haplotypes were identified and classified in four groups: (1) one restricted
to Nelson’s trout (Oncorhynchus mykiss nelsoni), (2) four restricted to Río Mayo and RíoYaqui trout (O. mykiss sspp.), (3) six to Mexican golden trout (O. chrysogaster) with two subgroups, and (4) one exclusive to Río Piaxtla trout. Distributions of native haplotypes broadly overlap the distribution
of non-native hatchery rainbow trout reflecting the historical management of introductions of exotic rainbow trout and the
artificial transference of these trout among basins. 相似文献
10.
Faustino Camarena‐Rosales Jorge De La Rosa‐Vlez Gorgonio Ruiz‐Campos Francisco Correa 《International Review of Hydrobiology》2001,86(2):229-240
Type localities and/or central populations of coastal and inland killifishes along the peninsula of Baja California were sampled to survey the biometric and allozymic relationships among them. The standard stepwise discriminatory function analysis of biometric characters classified organisms into three well distinctive groups (p < 0.001). The number of scales in the lateral series successfully split the species, while the caudal length/standard length ratio did so between subspecies. Two diagnostic loci (PROT–2* and AAT–2*) segregated private alleles in each taxon. Fundulus lima showed lower genetic variability levels than F. parvipinnis spp., in both polymorphism (18.8% in F. lima vs. 25.0% in F. parvipinnisspp.) and expected heterozygosity (0.060 in F. lima vs 0.099 in F. p. brevis and 0.089 in F. p. parvipinnis). The reduced genetic variability in the threatened species F. lima may be related to its evolutionary history. Nei's genetic distance between F. lima and F. p. parvipinnis was 0.247, while 0.075 between F. parvipinnis spp. 相似文献