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31.
32.
André?Luiz?Machado?Pessanha Francisco?Gerson?AraújoEmail author Márcia?Cristina?Costa?De?Azevedo Iracema?Dias?Gomes 《Marine Biology》2003,143(6):1047-1055
The effect of diel and seasonal changes in the distribution of fishes on a subtropical sandy beach on the southeastern coast of Brazil were studied. Seine netting was carried out on both seasonal and diel scales between July 1998 and June 1999. A total of 46 fish species was recorded, six being numerically dominant: Anchoa tricolor, Gerres aprion, Harengula clupeola, Atherinella brasiliensis, Mugil liza and Diapterus rhombeus. Seasonal changes in abundance of dominant species were detected. Species dominant in winter were Anchoa tricolor, H. clupeola and Atherinella brasiliensis; in spring, Anchoa tricolor and G. aprion; in summer G. aprion and D. rhombeus; and in autumn M. liza and H. clupeola. Overall, diel patterns did not reveal any significant trends; however, if we consider each season separately, an increase in A. tricolor abundance was recorded during the day in winter/spring, being replaced at night by H. clupeola in winter, and by G. aprion in spring. Increases in number of individuals and biomass at sunset, and decreases during the night were recorded. The winter/spring inshore/offshore movements at diel scale performed by the three most abundant species demonstrate that diel fluctuation acts more at a species-specific level than at a structural one; in summer there was no evidence of diel movements due to a heavy influx of G. aprion and D. rhombeus, which use the area throughout day and night, increasing overall abundance. Seasonal movements seems to be related to ontogenetic change in species, while diel movements in the fish assemblage seem to be more related to physiological requirements, such feeding activity of each particular species, than to physico-chemical conditions.Communicated by O. Kinne, Oldendorf/Luhe 相似文献
33.
S. S. De Silva 《Marine Biology》1973,20(4):282-290
The food and feeding habits of the herring Clupea harengus L. and the sprat C. sprattus (L.) as 0-group and older fish in inshore waters of the west coast of Scotland, were studied from April, 1970 to March, 1972. The two species occurred together. The diets of 0-group herring and sprats are almost identical, both qualitatively and quantitatively. Their daily feeding rhythms also coincide. It is probable that competition between these two species in their first year of life could occur if the food supply is limiting. Changes in diet between 0-group and older fish are more pronounced in herring than in sprats. The diet itself is mainly crustacean in both clupeids, with copepods contributing the major share. 相似文献
34.
对承德市热电厂CG35/3.82-MX型循环流化术锅炉的脱硫除尘系统进行了改造,解决了原水膜除尘器效率低,烟法排放严重超标的问题,取得了良好的环境效益,社会效益和经济效益。 相似文献
35.
Aldas Miguel Pavon Cristina De La Rosa-Ramírez Harrison Ferri José Miguel Bertomeu David Samper María Dolores López-Martínez Juan 《Journal of Polymers and the Environment》2021,29(8):2686-2700
Journal of Polymers and the Environment - Since biodegradable materials are unwittingly mixed with synthetic materials, this work aimed to study the feasibility of reliably identifying some... 相似文献
36.
20世纪重大自然灾害评析 总被引:16,自引:8,他引:16
人类在科学技术上取得了辉煌成绩的同时,在认识自然和改造自然方面也得到了才识和新的认识,这一教训主要是来自自然灾害。根据收集到的全球自然灾害有关数据,对20世纪全球主要自然灾害特征分布特点进行了分析,并对其成因提出了看法。 相似文献
37.
Alex Kacelnik Marco Vasconcelos Tiago Monteiro Justine Aw 《Behavioral ecology and sociobiology》2011,65(3):547-558
Charles Darwin aided his private decision making by an explicit deliberation, famously deciding whether or not to marry by
creating a list of points in a table with two columns: “Marry” and “Not Marry”. One hundred seventy-two years after Darwin’s
wedding, we reconsider whether this process of choice, under which individuals assign values to their options and compare
their relative merits at the time of choosing (the tug-of-war model), applies to our experimental animal, the European Starling,
Sturnus vulgaris. We contrast this with the sequential choice model that postulates that decision-makers make no comparison between options
at the time of choice. According to the latter, behaviour in simultaneous choices reflects adaptations to contexts with sequential
encounters, in which the choice is whether to take an opportunity or let it pass. We postulate that, in sequential encounters,
the decision-maker assigns (by learning) a subjective value to each option, reflecting its payoff relative to background opportunities.
This value is expressed as latency and/or probability to accept each opportunity as opposed to keep searching. In simultaneous
encounters, choice occurs through each option being processed independently, by a race between the mechanisms that generate
option-specific latencies. We describe these alternative models and review data supporting the predictions of the sequential
choice model. 相似文献
38.
39.
Corniello Alfonso Guida Marco Stellato Luisa Trifuoggi Marco Carraturo Federica Del Gaudio Elena Del Giudice Carmela Forte Giovanni Giarra Antonella Iorio Marina Marzaioli Fabio Toscanesi Maria 《Environmental geochemistry and health》2022,44(7):1949-1970
Environmental Geochemistry and Health - The study deals with the analyses of springs and wells at the base of Montepugliano Hill that represents the SE edge of the wide carbonate Matese massif... 相似文献
40.
Scungio Mauro Crognale Silvia Lelli Davide Carota Eleonora Calabrò Giuseppe 《Environmental geochemistry and health》2022,44(7):2009-2020
Environmental Geochemistry and Health - Thermal caves represent an environment characterized by unique chemical/physical properties, often used for treatment and care of musculoskeletal,... 相似文献