1,720,965 research outputs found
Pollimyrus isidori
No full textPollimyrus isidori (Valenciennes, 1846) GenBank accession no. AF095302 (Sullivan et al. 2000).Published as part of Kramer, Bernd, Bank, Herman van der & Wink, Michael, 2013, Marked differentiation in a new species of dwarf stonebasher, Pollimyrus cuandoensis sp. nov. (Mormyridae: Teleostei), from a contact zone with two sibling species of the Okavango and Zambezi rivers, pp. 429-463 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 48 (7 - 8) on page 456, DOI: 10.1080/00222933.2013.807950, http://zenodo.org/record/463157
Marcusenius angolensis
No full textMarcusenius angolensis (Boulenger, 1905) (Figure 1B)Published as part of Kramer, Bernd, Skelton, Paul, Bank, Herman Van Der & Wink, Michael, 2007, Allopatric differentiation in the Marcusenius macrolepidotus species complex in southern and eastern Africa: the resurrection of M. pongolensis and M. angolensis, and the description of two new species (Mormyridae, Teleostei), pp. 647-708 in Journal of Natural History 41 (9 - 12) on page 680, DOI: 10.1080/00222930701250987, http://zenodo.org/record/465836
Pollimyrus castelnaui
No full textPollimyrus castelnaui (Boulenger, 1911) (1) Pollimyrus castelnaui (Boulenger, 1911). Syntypes BMNH 1910.5.31.11-12 (2) from Okavango River, Botswana. (2) Pollimyrus castelnaui. ZSM 39534, 35 specimens from Makwena River Camp, Okavango, 19 ◦ 03 ′ 16.2 ′′ S, 22 ◦ 22 ′ 51.3 ′′ E, field codes Oka 01v–Oka03v, Oka 05v–Oka07v, Oka 13v–Oka17v, AOka18v, BOka18v, Oka 19v, AOka20v, BOka20v, Oka 22v–Oka31v, AOka32v, BOka32v, Oka 33v–Oka38v, Oka 40v, 20–21 January 2001, water conductivity, 37 µS / cm, 29.9 ◦ C, coll. F.H. Van der Bank, J. Engelbrecht, B. Kramer.Published as part of Kramer, Bernd, Bank, Herman van der & Wink, Michael, 2013, Marked differentiation in a new species of dwarf stonebasher, Pollimyrus cuandoensis sp. nov. (Mormyridae: Teleostei), from a contact zone with two sibling species of the Okavango and Zambezi rivers, pp. 429-463 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 48 (7 - 8) on page 453, DOI: 10.1080/00222933.2013.807950, http://zenodo.org/record/463157
Pollimyrus petricolus
No full textPollimyrus petricolus (Daget, 1954) GenBank accession no. AF201608 (Sullivan et al. 2000). Appendix 2. Morphological and genetic differences between samples (Continued) Notes: SE, standard error. Median and SIQ (semi-interquartiles), for count measures (nD, nA, SPc, SLS). For locality symbols, refer to map of Figure 1. Notes: SE, standard error. Median and SIQ (semi-interquartiles), for count measures (nD, nA, SPc). For localities Z1, K, O1 refer to map of Figure 1. ∗ After EOD recording, four additional specimens were too damaged to take tissue samples, but were good for DNA. Notes: N = 155 specimens from Okavango (N = 34), Upper Zambezi (N = 61), and Kwando: Kongola Bridge (N = 15), Nakatwa (N = 11), Nkasa (N = 6), Linyanti / Sampis (N = 28). Appendix 3. Electrical characters for different populations of P.cuandoensis sp. nov. from the Kwando River 1 Negative values for N0: maximum and minimum reversed (that is, taken absolute). For locality symbols in parentheses, refer to map of Figure 1. Notes: N = 127 specimens: Kongola Bridge (N = 63), Nakatwa (N = 24), Nkasa (N = 7), Linyanti / Sampis (N = 33).Published as part of Kramer, Bernd, Bank, Herman van der & Wink, Michael, 2013, Marked differentiation in a new species of dwarf stonebasher, Pollimyrus cuandoensis sp. nov. (Mormyridae: Teleostei), from a contact zone with two sibling species of the Okavango and Zambezi rivers, pp. 429-463 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 48 (7 - 8) on pages 456-463, DOI: 10.1080/00222933.2013.807950, http://zenodo.org/record/463157
Pollimyrus marianne Kramer 2003
No full textPollimyrus marianne Kramer et al., 2003 (3) ZSM 39524 (4), ZSM 39525 (3), seven specimens from Katima Mulilo, Upper Zambezi, 17 ◦ 29 ′ S, 24 ◦ 17 ′ E, 11 September 1993, field codes 33Fish, 39Fish, 41Fish, 42Fish, 53Fish, 56Fish, 57Fish, water conductivity, 81 µS / cm, 21.8 ◦ C, coll. F.H. Van der Bank and B. Kramer. (4) ZSM 39526 (2), ZSM 39527 (2), Four specimens from Lisikili, Upper Zambezi, 17 ◦ 32 ′ S, 24 ◦ 26 ′ E, 5–7 March 1994, field codes L30isi, L32isi, L47isi, L52isi, water conductivity 56.1 µS / cm, 26.8 ◦ C, coll. F.H. Van der Bank and B. Kramer. (5) ZSM 39528 (4), ZSM 39529 (18), ZSM 39530 (18), ZSM 39531, 53 specimens from Lisikili, Upper Zambezi, 17 ◦ 32 ′ S, 24 ◦ 26 ′ E, 7 April 1996, field codes Ka72–Ka75, Ka91, Ka92, Ka94, Ka96, Ka98, Ka99, Ka101- Ka104, Ka107, Ka109–Ka126, Ka139- Ka147, Ka149, Ka160–Ka162, Ka164–Ka168, Ka170, Ka172, water conductivity 66 µS / cm, 25.8 ◦ C, coll. F.H. Van der Bank and B. Kramer. (6) Seventy-seven specimens from Upper Zambezi, Lisikili L1, 17 ◦ 32 ′ 31.9 ′′ S, 24 ◦ 26 ′ 17.7 ′′ E, field codes Lisi01–Lisi21, Lisi23, Lisi25–Lisi29, Lisi32 Lisi36, ZSM 41775 (L37–L56), Lisi 57– Lisi 61, Lisi 63– Lisi 68, Lisi 70– Lisi 72, Lisi 74– Lisi 84, ZSM 41776 (JHB1), water conductivity 91.5 µS / cm, 19.0 ◦ C, 5–6 August 2004, coll. F.H. Van der Bank and B. Kramer.Published as part of Kramer, Bernd, Bank, Herman van der & Wink, Michael, 2013, Marked differentiation in a new species of dwarf stonebasher, Pollimyrus cuandoensis sp. nov. (Mormyridae: Teleostei), from a contact zone with two sibling species of the Okavango and Zambezi rivers, pp. 429-463 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 48 (7 - 8) on pages 453-454, DOI: 10.1080/00222933.2013.807950, http://zenodo.org/record/463157
Pollimyrus cuandoensis Kramer & Bank & Wink 2013, sp. nov.
No full textPollimyrus cuandoensis sp. nov. From Kwando River (total of 63 specimens): (4) Five specimens from Kongola Bridge, 10 April 1996, field codes Kw150d, Kw154d–Kw158d, SL 4.95–6.07 cm, water conductivity 100 µS / cm, 25–26 ◦ C, coll. F.H. Van der Bank and B. Kramer. (5) Sixteen specimens from Kongola Bridge, 25 August 1999, field codes Kon16G– Kon19G, Kon21G–Kon23G, Kon25G–Kon31G, Kon39G, Kon40G, water conductivity 236 µS / cm, 19 ◦ C, coll. F.H. Van der Bank and B. Kramer. (6) Two specimens from Kongola Bridge, 24 January 2001, field codes Kon01g, Kon 18g, water conductivity 160 µS / cm, 26.6 ◦ C, coll. F.H. Van der Bank, J. Engelbrecht and B. Kramer. (7) Forty specimens from Kongola Bridge, 8 August 2004, field codes Kong88–Kong95, Kong97–Kong105, Kong107–Kong129, water conductivity 175–209 µS / cm, 17.9 ◦ C, coll. H. Van der Bank and B. Kramer. (8) Twenty-four specimens from Nakatwa, 9–15 March 1994, N56ka–N59ka, N62ka–N71ka, N74ka–N79ka, N81ka, N82ka, N96ka, N97ka, water conductivity 130 µS / cm, 24.9 ◦ C, coll. F.H. Van der Bank and B. Kramer. (9) Eight specimens from Linyanti-Sampis, 8 April 1996, field codes Li01ny, Li02ny, Li04ny–Li06ny, Li08ny, Li09ny, Li11ny, water conductivity 100 µS / cm, 25–26 ◦ C, coll. F.H. Van der Bank and B. Kramer. (10) ZSM 39532 (14), ZSM 39533 (14), Twenty-eight specimens from Linyanti- Sampis, 8–10 September 1997, field codes Lin 01– Lin 14, Lin 15– Lin 28, coll. F.H. Van der Bank and B. Kramer. (11) Seven specimens from Nkasa Island, 9–10 September 1993, field codes 1Fish, 2Fish, 3Fish, 6Fish 10Fish, 12Fish, 13Fish, water conductivity 108 µS / cm, 18–19 ◦ C, coll. F.H. Van der Bank and B. Kramer.Published as part of Kramer, Bernd, Bank, Herman van der & Wink, Michael, 2013, Marked differentiation in a new species of dwarf stonebasher, Pollimyrus cuandoensis sp. nov. (Mormyridae: Teleostei), from a contact zone with two sibling species of the Okavango and Zambezi rivers, pp. 429-463 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 48 (7 - 8) on pages 454-455, DOI: 10.1080/00222933.2013.807950, http://zenodo.org/record/463157
Pollimyrus Taverne 1971
No full textPollimyrus Taverne, 1971 Diagnosis (translated from Taverne 1971, p. 108) Fairly short to elongate body; snout shorter than the postorbital portion of the skull, with a high upper jaw (“une mâchoire supérieure haute”) that is curved backwards and slightly longer rostrally than lower jaw, mouth terminal, inferior or subinferior; caudal peduncle two to five times longer than deep; 15 to 36 dorsal fin rays; 21 to 31 anal fin rays; 9 to 12 pectoral fin rays; 35 to 70 lateral line scales; 7 to 21 / 8 to 23 scales in a transverse line of the body; 8 to 17 / 6 to 20 scales in a transverse line between the dorsal and the anal fins; 12 to 20 scales around the caudal peduncle; 5 to 9 / 6 to 10 bicuspid teeth; lateral ethmoid present but reduced; mesethmoid rather large and curved backwards; six circumorbital bones; anterior orbital and first infraorbital not fused; four hypural bones; 39 to 45 vertebrae. Type species: Pollimyrus isidori (Valenciennes, 1846). Included species. Valid unless stated otherwise. adspersus, Mormyrus Günther, 1866. Current status: valid as Pollimyrus adspersus (Günther, 1866). brevis, Marcusenius Boulenger, 1913. Current status: valid as Pollimyrus brevis (Boulenger, 1913). castelnaui, Marcusenius Boulenger, 1911. Current status: valid as Pollimyrus castelnaui (Boulenger, 1911). cuandoensis sp. nov., Pollimyrus Kramer, van der Bank and Wink, 2013. guttatus, Petrocephalus Fowler, 1936. Current status: valid as Pollimyrus guttatus (Fowler, 1936). isidori, Mormyrus Valenciennes, 1847. Current status: valid as Pollimyrus isidori (Valenciennes, 1847). maculipinnis, Marcusenius Nichols and La Monte, 1934. Current status: valid as Pollimyrus maculipinnis (Nichols & La Monte, 1934). marianne, Pollimyrus Kramer, van der Bank, Flint, Sauer-Gürth and Wink, 2003. nigricans, Marcusenius Boulenger, 1906. Current status: valid as Pollimyrus nigricans (Boulenger, 1906). nigripinnis, Marcusenius Boulenger, 1899. Current status: valid as Pollimyrus nigripin- nis (Boulenger, 1899). pedunculatus, Marcusenius David and Poll, 1937. Current status: valid as Pollimyrus pedunculatus (David and Poll, 1937). petherici, Marcusenius Boulenger,1899. Current status: valid as Pollimyrus petherici (Boulenger, 1898). petricolus, Marcusenius Daget, 1954. Current status: valid as Pollimyrus petricolus (Daget, 1954). plagiostoma, Marcusenius Boulenger, 1889. Current status: valid as Pollimyrus plagiostoma (Boulenger, 1898). pulverulentus, Marcusenius Boulenger, 1899. Current status: valid as Pollimyrus pulverulentus (Boulenger, 1899). schreyeni, Pollimyrus Poll, 1972. stappersi, Marcusenius Boulenger, 1915. Current status: valid as Pollimyrus stappersi (Boulenger, 1915). tumifrons, Marcusenius Boulenger, 1902. Current status: valid as Pollimyrus tumifrons (Boulenger, 1902).Published as part of Kramer, Bernd, Bank, Herman van der & Wink, Michael, 2013, Marked differentiation in a new species of dwarf stonebasher, Pollimyrus cuandoensis sp. nov. (Mormyridae: Teleostei), from a contact zone with two sibling species of the Okavango and Zambezi rivers, pp. 429-463 in Journal of Natural History (J. Nat. Hist.) (J. Nat. Hist.) 48 (7 - 8) on pages 444-445, DOI: 10.1080/00222933.2013.807950, http://zenodo.org/record/463157
Marcusenius devosi Kramer & Skelton & Bank & Wink 2007, sp. n.
No full textMarcusenius devosi, sp. n. (Figure 1 G) Type specimens. Holotype: SAIAB 79138 (specimen Ta13na), Kenya: Tana River. Paratypes: SAIAB 79139 (14), ZSM 35091 (3), ZSM 35092 (1), ZSM 35093 (4), ZSM 35094 (7). Type locality. Kenya: Lower Tana River near village Wenje: 1 u 52938.10S, 40 u 8922.50E (no. 14, Figure 4). The presence of G. macrolepidotus, or a form of this species, in the equatorial Tana River of East Africa was suggested by Whitehead and Greenwood (1959) and Whitehead (1959, 1962); for M. macrolepidotus adopted by Seegers (1996, p. 76). However, a critical comparison with M. macrolepidotus has not been made. Diagnosis. Longest mean pD of 41% (39.5–43.4%) of SL, shortest mean PAL of 59.1% (57–61%) of SL, shortest mean PDL of 62.3% (59.8–64%), long mean CPL of 20.2% (19.2–22.1%), median SLS of 62.5 (56–66) vs. 55.5 (52–62) in M. macrolepidotus, a median 22 (21–24) dorsal fin rays, 28 (26–30) anal fin rays, 16 (14–18) scales around caudal peduncle; EOD lacking weak head-negative pre-potential, strongest Namp relative to Pamp among samples from all origins (typically 137%), but short Ndur (about 140 Ms at 25 u C and ''5% threshold criterion''), Pdur of long duration (typically greater than 230 Ms), brief PNsep (typically 76 Ms). Fish from Rovuma River: anal and dorsal fin ray counts, one ray more each, SPc identical, CPD/CPL ratio significantly lower, LD and HL higher. Description. Head with terminal mouth well in front of eye, mental lobe on lower jaw protruding beyond upper jaw. Head and body dorsolaterally compressed. Dorsal fin situated about two thirds of standard length from snout, obliquely orientated, anteriorly higher and posteriorly lower, distal margin sometimes only slightly crescentic with anterior two or three rays longer than posterior rays, number of rays 21 (N 53), 22 (N 518), 23 (N 55), 24 (N 54); anal fin opposite dorsal fin with distinctly more anterior origin, obliquely orientated, anteriorly lower and posteriorly higher, anterior rays longer than posterior ones, especially in males where they also appear stronger and often darkened, distal margin crescentic (in males only posterior to rounded, elongated anterior part of fin), number of rays 26 (N 51), 27 (N 59), 28 (N 514), 29 (N 54), 30 (N 52). Scales cycloid with reticulate striae, scales extending anteriorly to operculum and pectoral fins (beyond pelvics). Scales on caudal peduncle circumference, 14 (N 52), 15 (N 51), 16 (N 526), 17 (N 50), 18 (N 51). Caudal peduncle relatively deep, subcylindrical entire length, usually 20% (19–21%) in SL. Electric organ discharge biphasic lacking a weak pre-potential, Pamp of relatively long duration (around 230–235 Ms at 25 u C and ''5% threshold criterion''), increasing with SL at least in females and juveniles, Ndur of very short duration (usually around 140 Ms), but very strong Namp (137% of Pamp). No sexual dimorphism recognized. Males approaching sexual maturity develop a kink in the base of the anal fin which is absent in juveniles and females where the anal fin base is straight. Colour in preservation. Head and back when seen from above, dark. Body sides light brown to light ochre, the ochre found especially on lower parts and underside. Dorsal fin usually darker than anal fin. Homogeneous coloration without any blotches, increasingly lighter from back to belly. Ecology. The Tana River is a major, perennial river of about 700 km length that originates from the equatorial Mt. Kenya and flows into the Indian Ocean. In its final part close to the sea the river is bordered by gallery forest, surrounded by dry savannah on both sides. In August the water was murky and brown, and visibility very low. River borders are high and steep and difficult to climb up or down. Even though the water level was low the current was strong. Distribution. Presently only known from the Tana River but range extension both to the north and south likely. Samples from the Rovuma River System more than 1000 km to the south are more similar to M. devosi than M. macrolepidotus in anatomical characters but take an intermediate, independent position in ISSR-PCR genetic analysis. Relationships. Marcusenius devosi is considered closest to M. macrolepidotus based largely on the confusion of the identity of both species. Marcusenius devosi is distinguished most easily by its longer posterior body part relative to the anterior body part, as evidenced by higher lengths for the caudal peduncle and for pD, and lower lengths for PDL, PAL, and HL. BD was also lower in M. devosi. Marcusenius devosi when compared to M. macrolepidotus carries a longer mental lobe on the lower jaw, and has an EOD of shorter N phase duration and much greater strength relative to P phase (than Buzi specimens); the EOD of M. devosi shows no evidence for sexual dimorphism. There is also very little affinity with G. moeruensis whose morphological parameters are outside the range observed in the Tana River sample for: PDL, PAL, LD, pD, CPL, CPD, BD, nA, and SPc. Etymology. Marcusenius devosi is named in honour of Dr. Luc De Vos, late curator of fishes at Nairobi Museum (born 8 December 1957 at Sint-Niklaas/ Belgium, deceased 14 June 2003 at Nairobi/ Kenya), for his contributions to African ichthyology and promotion of ichthyology in East Africa (see obituary by J. Snoeks).Published as part of Kramer, Bernd, Skelton, Paul, Bank, Herman Van Der & Wink, Michael, 2007, Allopatric differentiation in the Marcusenius macrolepidotus species complex in southern and eastern Africa: the resurrection of M. pongolensis and M. angolensis, and the description of two new species (Mormyridae, Teleostei), pp. 647-708 in Journal of Natural History 41 (9 - 12) on pages 686-688, DOI: 10.1080/00222930701250987, http://zenodo.org/record/465836
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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