scholarly journals Interpretation of geographic variation in size of American eel Anguilla rostrata elvers on the Atlantic coast of North America using their life history and otolith ageing

1998 ◽  
Vol 168 ◽  
pp. 35-43 ◽  
Author(s):  
CH Wang ◽  
WN Tzeng
Keyword(s):  
Life History ◽  
North America ◽  
Geographic Variation ◽  
Atlantic Coast ◽  
Anguilla Rostrata ◽  
American Eel

Geographic effects on American eel (Anguilla rostrata) life history characteristics and strategies

2010 ◽  
Vol 67 (2) ◽  
pp. 326-346 ◽  
Author(s):  
B. M. Jessop
Keyword(s):  
Life History ◽  
Growth Rates ◽  
Atlantic Coast ◽  
Life History Strategies ◽  
Anguilla Rostrata ◽  
Annual Growth Rate ◽  
Degree Days ◽  
Silver Eel ◽  
American Eel ◽  
Spawning Site

Latitudinal variability in length and age at maturity and annual growth rate for the American eel ( Anguilla rostrata ) along the Atlantic coast of North America was examined with respect to life history strategies and theory. Maturing (silver phase) female lengths and ages increased with increasing latitude (and distance) from the Sargasso Sea spawning site, as did male ages but not lengths. Growth rates for females (and males) declined with increasing latitude south of 44°N latitude, approximately the entrance to the Cabot Strait, but were constant or increased within the Gulf of St. Lawrence and St. Lawrence River, depending on the analysis method. The growing season and the number of degree-days ≥ 10 °C declined with increasing latitude. Female growth rates adjusted for the number of degree-days were approximately constant south of 44°N but increased further north, suggesting countergradient variation in growth. The temperature–size rule (increase in body size at lower temperatures) evidently applies to American eel females, but not males. No current life history model provides a satisfactory explanatory mechanism for the temperature–size rule and for anguillid life history strategies. A genetic link is proposed between increasing age (length) at elver and silver eel stages with increasing distance from the spawning area.

Life history characteristics and strategies of the American eel, Anguilla rostrata

1999 ◽  
Vol 56 (5) ◽  
pp. 795-802 ◽  
Author(s):  
Kenneth Oliveira
Keyword(s):  
Life History ◽  
Rhode Island ◽  
Life History Traits ◽  
Life History Strategies ◽  
Anguilla Rostrata ◽  
Female Size ◽  
Silver Eel ◽  
Male Size ◽  
American Eel ◽  
Female Age

Several life history hypotheses for the American eel, Anguilla rostrata, were examined using seaward-migrating silver-phase eels collected in the Annaquatucket River, Rhode Island, U.S.A. Female eels were significantly larger and older than males. Female eels also had a significantly higher mean growth rate. The addition of life history data from Annaquatucket River eels to published silver eel data from locations throughout the eels' range shows that female size at migration is positively correlated with latitude (r = 0.56, p = 0.05) but male size is not (r = 0.54, p = 0.17). Female age was not related to latitude (r = 0.57, p = 0.27) but male age showed a positive relationship (r = 0.87, p = 0.05). Growth rates for females and males were inversely related to latitude (r = -0.98, p = 0.02 and r = -0.95, p = 0.05, respectively). Differences between the latitudinal relationships and life history traits of the sexes may be due to differences in life history strategies.

Life History and Taxonomic Status of an Isolated Population of Arctic Char, Salvelinus alpinus, from Gros Morne National Park, Newfoundland

1978 ◽  
Vol 35 (12) ◽  
pp. 1537-1541 ◽  
Author(s):  
P. J. Rombough ◽  
S. E. Barbour ◽  
J. J. Kerekes
Keyword(s):  
Life History ◽  
North America ◽  
National Park ◽  
Salvelinus Alpinus ◽  
Atlantic Coast ◽  
Fork Length ◽  
Taxonomic Status ◽  
Arctic Char ◽  
Insect Larvae ◽  
Meristic Characters

Landlocked Arctic char, Salvelinus alpinus, from Candlestick Pond, Gros Morne National Park, Newfoundland, were characterized by slow growth, short life span (max 7 yr), and small size (max fork length = 164 mm). Sexual maturity was obtained at age 3, fecundity was low (max 104 ova per fish), and spawning annual. Major food items were zooplankton and aquatic insect larvae. Eight morphometric and eight meristic characters were examined and compared with available literature data for nonanadromous S. alpinus in eastern North America. Arctic char from Candlestick Pond were not significantly different from S. alpinus oquassa from Quebec and Maine but were significantly different from char from Labrador and other locations in insular Newfoundland. It is proposed that Arctic char from Candlestick Pond are descendents of an aboriginal form of S. alpinus that has been largely displaced along the Atlantic coast of North America. Key words: Salvelinus alpinus, Newfoundland, life history, taxonomic status

scholarly journals Life history of American eel Anguilla rostrata: new insights from otolith microchemistry

2008 ◽  
Vol 1 ◽  
pp. 205-216 ◽  
Author(s):  
BM Jessop ◽  
DK Cairns ◽  
I Thibault ◽  
WN Tzeng
Keyword(s):  
Life History ◽  
Otolith Microchemistry ◽  
Anguilla Rostrata ◽  
American Eel ◽  
History Of

The American Eel (Anguilla rostrata) in Eastern Lake Ontario

1972 ◽  
Vol 29 (5) ◽  
pp. 535-543 ◽  
Author(s):  
Donal A. Hurley
Keyword(s):  
Life History ◽  
Sexual Maturity ◽  
Lake Ontario ◽  
The Other ◽  
Anguilla Rostrata ◽  
Growth Phases ◽  
American Eel ◽  
Ottawa River ◽  
History Of ◽  
Fin Length

The life history of eels in Lake Ontario was studied by measuring, tagging, and releasing about 1500 individuals between 1958 and 1966. The smallest eels captured were from 295 to 318 mm long. Presumably they entered the lake at about age III–IV at lengths of 200–300 mm. Otoliths of eels from the lake showed a range in age between IV and XVIII, while those of smaller eels from the Ottawa River ranged between age II and IX. The length–weight regressions showed two distinct growth phases: one from about 480 mm to 790 mm, the other from about 830 mm to 1080 mm. Growth of the orbital diameter, interorbital distance, and pectoral fin length in relation to total length was not obviously related to sexual maturity. Eels that emigrated from the lake had a greater weight–length ratio than those that remained in the lake for another year. Of 917 tagged eels transplanted within Lake Ontario, 28 were recaptured near and 18 recaptured far from the original capture site. Although the results are inconclusive, there is a suggestion that eels have home territories within the lake.

Relating American Eel Anguilla rostrata abundance to environmental DNA concentration in the Bronx River

2021 ◽  
Author(s):  
Sam C. Chin ◽  
John Waldman ◽  
Mike Bednarski ◽  
Merry Camhi ◽  
Jake LaBelle ◽  
...  
Keyword(s):  
Environmental Dna ◽  
Anguilla Rostrata ◽  
American Eel ◽  
Dna Concentration ◽  
Bronx River

A desert songbird with no confamilials in the Western Hemisphere (Verdin, Auriparus flaviceps) investigates divergent conspecific songs

The Auk ◽  
2021 ◽  
Author(s):  
Emma I Greig ◽  
Eva Kinnebrew ◽  
Max L Witynski ◽  
Eric C Larsen
Keyword(s):  
North America ◽  
Geographic Variation ◽  
Playback Experiment ◽  
Western Hemisphere ◽  
Monotypic Genus ◽  
Vocal Responses ◽  
Song Variation ◽  
Desert Regions ◽  
Close Relatives

Abstract Most birds that show geographic variation in their songs discriminate between local and foreign songs, which may help them avoid unnecessary conflicts with vagrant individuals or similar-sounding congeners. However, some species respond equally to foreign and local songs, which may be useful if foreign individuals present territorial threats or if there are no sympatric congeners to avoid. Species without sympatric congeners are not commonly tested in playback studies, but they offer an opportunity to see how song variation and recognition unfolds when the pressure to avoid similar congeners is absent. Here, we use Verdins (Auriparus flaviceps), a monotypic genus of songbird with no confamilials in North America, to explore song variation and recognition in a species living without close relatives. We assessed geographic variation in song across the Verdin range and conducted a playback experiment using exemplars from 2 acoustically divergent and geographically distant regions as treatments. We found significant geographic variation in song that mapped well onto ecologically distinct desert regions. We found that Verdins had stronger vocal responses to local-sounding songs, but had equal movement responses to local-sounding and foreign songs. These results are similar to results found in other species without sympatric congeners and provide an example of a species that investigates acoustically divergent conspecific songs, despite recognizing salient differences in those songs.

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