W. LlNN MONTGOMERY*, STEPHEN D. McCORMICK*, ROBERT J. NAIMAN*, FREDERICK G. WHORISKEY*, GEOFF BLA... more W. LlNN MONTGOMERY*, STEPHEN D. McCORMICK*, ROBERT J. NAIMAN*, FREDERICK G. WHORISKEY*, GEOFF BLACK* ... with no fish greater than 13 cm FL despite considerable angling, fyke netting and seining during July and early August (JA Gustin, unpublished data). ...
The Editor wishes to thank all the referees of published articles in Volume 60, as well as those ... more The Editor wishes to thank all the referees of published articles in Volume 60, as well as those who gave of their knowledge and time but upon whose judgement rejections had to be made (superscript gives the number of manuscripts reviewed for this volume if more than one).
The species complex in the Lower Colorado River Basin has a complicated taxonomic history. Recent... more The species complex in the Lower Colorado River Basin has a complicated taxonomic history. Recent authors have separated this group into three nominal taxa, , , and , however aside from location, no reliable method of distinguishing individuals of these species currently exists. To assess relationships within this group, we examined morphology of type specimens and fresh material, and used RADseq methods to assess phylogenetic relationship among these nominal species. Maximum likelihood and Bayesian inference tree building methods reveal high concordance between tree topologies based on the mitochondrial and nuclear datasets. Coalescent SNAPP analysis resolved a similar tree topology. Neither morphological nor molecular data reveal diagnostic differences between these species as currently defined. As such, and should be considered synonyms of the senior . We hypothesize that climate driven wet and dry cycles have led to periodic isolation of population subunits and subsequent local ...
During May–June 1980 and June–July 1982, six fish species exited Rivière à la Truite, a major tri... more During May–June 1980 and June–July 1982, six fish species exited Rivière à la Truite, a major tributary of the lower Moisie River, Quebec, in highly synchronized emigrations. Species included longnose sucker (Catostomus catostomus), white sucker (C. commersoni), lake chub (Couesius plumbeus), juvenile sea lamprey (Petromyzon marinus), Atlantic salmon (Salmo salar) parr and smolt, and anadromous brook trout (Salvelinus fontinalis). In 1980, emigration for all species except the lamprey began on 27 May and ended by 9–11 June; lamprey movements began on 4–5 June and peaked on 10 June. Similar but slightly later patterns occurred in 1982. Onset of the runs in each year coincided with declining water levels and discharge. Thus species of widely different habits exhibit similar and highly synchronized migratory patterns, possibly in response to strong changes in stream environment.
ABSTRACT Epulopiscium fishelsoni n. g., n. sp., is described from the gut of Acanthurus nigrofusc... more ABSTRACT Epulopiscium fishelsoni n. g., n. sp., is described from the gut of Acanthurus nigrofuscus, an herbivorous surgeonfish (Acanthuridae: Teleostei) from the Red Sea, Israel. The symbiont is placed in the kingdom Protoctista (or Protista) but more specific taxonomic assignment is impossible at this time. The organism is of an elongate oval shape, round in cross-section, and highly mobile, with the ability to reverse direction rapidly. It lacks a mouth or other external structures, with the exception of fine surface filaments of an undetermined nature. Internally, there is a complex of folded membranes or tubules and a nucleus. No other organelles are evident. Reproduction is characterized by doubling of nuclei within the parental cell and emergence of daughter cells from a perforation in the parental cortex. Symbionts appear to exhibit circadian cycles of growth, reproductive activity, and movement within the gut. Although the organism greatly reduces local gut pH when present in large numbers, we know nothing of interactions between host and symbiont.
... Nonetheless, our knowledge comes from few locations, few biological disci-plines, and few of ... more ... Nonetheless, our knowledge comes from few locations, few biological disci-plines, and few of the more than 70 families of fishes occu-pying coral reefs. ... We appear to know little about large fractions of the world's coral reefs and their fishes. ...
W. LlNN MONTGOMERY*, STEPHEN D. McCORMICK*, ROBERT J. NAIMAN*, FREDERICK G. WHORISKEY*, GEOFF BLA... more W. LlNN MONTGOMERY*, STEPHEN D. McCORMICK*, ROBERT J. NAIMAN*, FREDERICK G. WHORISKEY*, GEOFF BLACK* ... with no fish greater than 13 cm FL despite considerable angling, fyke netting and seining during July and early August (JA Gustin, unpublished data). ...
The Editor wishes to thank all the referees of published articles in Volume 60, as well as those ... more The Editor wishes to thank all the referees of published articles in Volume 60, as well as those who gave of their knowledge and time but upon whose judgement rejections had to be made (superscript gives the number of manuscripts reviewed for this volume if more than one).
The species complex in the Lower Colorado River Basin has a complicated taxonomic history. Recent... more The species complex in the Lower Colorado River Basin has a complicated taxonomic history. Recent authors have separated this group into three nominal taxa, , , and , however aside from location, no reliable method of distinguishing individuals of these species currently exists. To assess relationships within this group, we examined morphology of type specimens and fresh material, and used RADseq methods to assess phylogenetic relationship among these nominal species. Maximum likelihood and Bayesian inference tree building methods reveal high concordance between tree topologies based on the mitochondrial and nuclear datasets. Coalescent SNAPP analysis resolved a similar tree topology. Neither morphological nor molecular data reveal diagnostic differences between these species as currently defined. As such, and should be considered synonyms of the senior . We hypothesize that climate driven wet and dry cycles have led to periodic isolation of population subunits and subsequent local ...
During May–June 1980 and June–July 1982, six fish species exited Rivière à la Truite, a major tri... more During May–June 1980 and June–July 1982, six fish species exited Rivière à la Truite, a major tributary of the lower Moisie River, Quebec, in highly synchronized emigrations. Species included longnose sucker (Catostomus catostomus), white sucker (C. commersoni), lake chub (Couesius plumbeus), juvenile sea lamprey (Petromyzon marinus), Atlantic salmon (Salmo salar) parr and smolt, and anadromous brook trout (Salvelinus fontinalis). In 1980, emigration for all species except the lamprey began on 27 May and ended by 9–11 June; lamprey movements began on 4–5 June and peaked on 10 June. Similar but slightly later patterns occurred in 1982. Onset of the runs in each year coincided with declining water levels and discharge. Thus species of widely different habits exhibit similar and highly synchronized migratory patterns, possibly in response to strong changes in stream environment.
ABSTRACT Epulopiscium fishelsoni n. g., n. sp., is described from the gut of Acanthurus nigrofusc... more ABSTRACT Epulopiscium fishelsoni n. g., n. sp., is described from the gut of Acanthurus nigrofuscus, an herbivorous surgeonfish (Acanthuridae: Teleostei) from the Red Sea, Israel. The symbiont is placed in the kingdom Protoctista (or Protista) but more specific taxonomic assignment is impossible at this time. The organism is of an elongate oval shape, round in cross-section, and highly mobile, with the ability to reverse direction rapidly. It lacks a mouth or other external structures, with the exception of fine surface filaments of an undetermined nature. Internally, there is a complex of folded membranes or tubules and a nucleus. No other organelles are evident. Reproduction is characterized by doubling of nuclei within the parental cell and emergence of daughter cells from a perforation in the parental cortex. Symbionts appear to exhibit circadian cycles of growth, reproductive activity, and movement within the gut. Although the organism greatly reduces local gut pH when present in large numbers, we know nothing of interactions between host and symbiont.
... Nonetheless, our knowledge comes from few locations, few biological disci-plines, and few of ... more ... Nonetheless, our knowledge comes from few locations, few biological disci-plines, and few of the more than 70 families of fishes occu-pying coral reefs. ... We appear to know little about large fractions of the world's coral reefs and their fishes. ...
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