Food and feeding of Kahawai (Teleostei: Arripididae)     

Alan N. Baker 《新西兰海洋与淡水研究杂志》2013,47(2):291-299

Analysis of 326 stomachs of the kahawai, Arripis trutta (Bloch and Schneider), from Wellington Harbour showed that the fish is a voracious carnivore which feeds mainly on fishes and to a lesser extent on planktonic crustaceans. The kahawai is principally a pelagic feeder, but occasionally takes food from the sea bottom; it appears to feed on those fishes which are locally most abundant, and follows shoals of small fish on which it preys. Small kahawai below 100 mm in length eat mainly copepods.  相似文献   

古尔班通古特沙漠南缘心叶驼绒藜种群更新的空间格局   总被引：6，自引：3，他引：3  

刘彤  赵新俊  贾亚敏  崔运河  骆郴  魏鹏  张元杭  林海荣 《中国沙漠》2008,28(2):258-265

心叶驼绒藜（C. ewersmanniana）是干旱区优质牧草和防风固沙植被的主要物种。在古尔班通古特沙漠南缘选择两个200 m×200 m具代表性样地,采用Ripley’s K(d)函数分析了心叶驼绒藜种群更新空间特征以及与群落梭梭（^{Haloxylon ammodendron}）、琵琶柴（^{Reaumuria soongorica}）、新疆绢蒿（^{Seriphidium kaschgaricum}）等三种主要灌木物种间作用关系。发现两个样点心叶驼绒藜大株（繁殖株）的空间分布对后代以及整个种群的空间分布影响极大,两个样点心叶驼绒藜大株、中株均与幼株间呈不同尺度的正关联,全部植株以及幼株都与新疆绢蒿呈正关联,与梭梭呈负关联,与琵琶柴关联性在两个样点结果相反。分析认,为心叶驼绒藜种群更新对成株依赖性极强,空间扩展能力很低。在0—35 m范围内种群更新的空间自相关性明显。四种灌木空间分布关系除受各自生态位决定外,主要受水等环境因素作用。最后对心叶驼绒藜等生态恢复方法提出建议。  相似文献   

Changes in the spatial distribution of autumn spawning herring (Clupea harengus L.) derived from annual acoustic surveys during the period 1984-1996     

Bailey  M. C.; Maravelias  C. D.; Simmonds  E. J. 《ICES Journal of Marine Science》1998,55(3):545-555

  相似文献   

Recruitment of coastal fishes and oceanographic variability in central California     

J.R. Wilson  B.R. Broitman  J.E. Caselle  D.E. Wendt 《Estuarine, Coastal and Shelf Science》2008,79(3):483-490

Recruitment of pelagic larval fishes to the nearshore environment is dependent on a suite of biological and physical processes operating at many spatial and temporal scales. Nearshore circulation processes associated with coastal upwelling are widely upheld as major determinants of year class strength for many rockfishes (Sebastes spp.), but the mechanism by which these processes drive recruitment is largely unknown. We used Standard Monitoring Units for the Recruitment of Fishes (SMURFs) to monitor recruitment of two rockfish complexes (Sebastes spp.) and cabezon (Scorpaenichthys marmoratus) from March to September of 2004 and 2005 at 3 sites along the central California coast. We examined the relationship between recruitment of these fishes and measurements of oceanographic variability associated with upwelling dynamics, including in situ water temperature, AVHRR sea surface temperature, the Bakun upwelling index, and an index of alongshore surface water transport. We found that rockfish comprising the KCGB complex (Sebastes atrovirens, Sebastes caurinus, Sebastes carnatus, Sebastes chrysomelas) recruit during early summer, while fishes of the BYO complex (Sebastes melanops, Sebastes flavidus, Sebastes serranoides), as well as cabezon recruit during late summer. Our results provide limited support for an association between the arrival of juvenile pelagic rockfish and cabezon to the nearshore environment and physical processes related to upwelling and relaxation. Beyond the limitations of our bimonthly sampling scheme, the lack of a clear pattern may be related to the near absence of upwelling–relaxation cycles along this stretch of coast during these two study periods. Moreover, the settlement and recruitment of nearshore fishes may be closely tied to processes occurring earlier in the larval stage.  相似文献   

RNA:DNA ratios of Baltic Sea herring larvae and copepods in embayment and open sea habitats     

Tomas O. Höök  Elena Gorokhova  Sture Hansson 《Estuarine, Coastal and Shelf Science》2008

Elucidation of important nursery habitats for young fish can aid in the management and assessment of fish stocks. Herring (Clupea harengus) in the Baltic Sea primarily spawn in coastal areas, but larvae are also present in off-shore, open sea areas. To investigate if sheltered coastal habitats provide a better growth environment for larval herring, we compared short-term growth (as indexed by whole body RNA:DNA ratios) of larval herring from three habitat types of the northwest Baltic proper (sheltered inner bay, exposed outer bay, and open sea). In addition, we compared individual RNA content of adult female Eurytemora affinis (a common Baltic copepod) among these different habitats. High RNA levels in these copepods indicate high production of nauplii, which are important food for larval herring. Both RNA:DNA ratios of larval herring and RNA content of E. affinis were significantly greater in embayment habitats, suggesting that the sheltered coastal areas are high quality nursery habitats for young Baltic herring.  相似文献   

Choice chamber experiments to test the attraction of postflexion Rhabdosargus holubi larvae to water of estuarine and riverine origin     

Nicola C. James  Paul D. Cowley  Alan K. Whitfield  Horst Kaiser 《Estuarine, Coastal and Shelf Science》2008

Although the recruitment of larvae and juveniles of marine fishes into estuaries has been well documented, little is known about the factors governing the immigration of estuary-associated marine fishes into estuaries. Fishes have a well-developed sense of smell and it has been suggested by several workers that olfactory cues of freshwater or estuarine origin serve as stimuli, attracting larvae and juveniles of estuary-associated species into estuaries. Attraction of postflexion Rhabdosargus holubi larvae to estuary and river water from the Kowie estuarine system, South Africa, was measured using a rectangular choice chamber. In experiments, conducted during peak recruitment periods, larvae selected estuary and river water with a significantly higher frequency than sea water. This study, the first to assess the possible role of olfaction in the recruitment process of an estuary-associated marine fish species, demonstrates that larvae are able to recognise water from different origins, probably based on odour.  相似文献   

Differences between marine and freshwater fish larvae: implications for recruitment   总被引：5，自引：0，他引：5  

Houde  E. D. 《ICES Journal of Marine Science》1994,51(1):91-97

  相似文献   

Sardine and horse mackerel recruitment and upwelling off Portugal   总被引：8，自引：2，他引：8  

Santos  A. Miguel P.; de Fatima Borges  Maria; Groom  Steve 《ICES Journal of Marine Science》2001,58(3):589-596

  相似文献   

A potential source of recruitment of Acartia pacifica nauplii: viable benthic resting eggs   总被引：4，自引：0，他引：4  

WANG Guizhong  JIANG Xiaodong  LI Shaojing  WU Lisheng  WU Dingxun 《海洋学报(英文版)》2005,24(2)

1 Introduction M any estuarine and coastal copepods that havepreviously been classified as holoplankton m ightbestbe described as adultm eroplankton since they actuallyspend a portion oftheir life cycle in the seabed as rest-ing eggs [review ed by G rice and M arcus (1981) andM arcus (1996)]. R esting eggs can be extrem ely abun-dant (106 m ) in bays and estuaries especially w here -2w aterdepths are less than 20 m (M arcus,1989).Theyare likely to profoundly influence the dynam ics ofpel…  相似文献   

Linkage between ocean climate, post-smolt growth, and survival of Atlantic salmon (Salmo salar L.) in the North Sea area   总被引：3，自引：0，他引：3  

Friedland  Kevin D.; Hansen  Lars P.; Dunkley  David A.; MacLean  Julian C. 《ICES Journal of Marine Science》2000,57(2):419-429

  相似文献