The fur seals and fur-seal islands of the North Pacific ocean

Clark, George Archilbald; Jordan, David Starr; Stejneger, Leonhard

doi:10.5962/bhl.title.1105

Cited by 12 publications

(4 citation statements)

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“…The politically-demarcated state of California is biogeographically significant because it contains a transition zone where cold-temperate and warm-temperate faunas of the Northeastern Pacific meet [9]. Since at least the late 1800s, it has been believed that this transition occurs around Point Conception (34.4˚N) [10,11]. At Point Conception, the coastline bends from a north-south to an east-west orientation to form the Southern California Bight.…”

Section: Introductionmentioning

confidence: 99%

Historical biogeography supports Point Conception as the site of turnover between temperate East Pacific ichthyofaunas

Miller

2023

PLoS ONE

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The cold temperate and subtropical marine faunas of the Northeastern Pacific meet within California as part of one of the few eastern boundary upwelling ecosystems in the world. Traditionally, it is believed that Point Conception is the precise site of turnover between these two faunas due to sharp changes in oceanographic conditions. However, evidence from intraspecific phylogeography and species range terminals do not support this view, finding stronger biogeographic breaks elsewhere along the coast. Here I develop a new application of historical biogeographic approaches to uncover sites of transition between faunas without needing an a priori hypothesis of where these occur. I used this approach to determine whether the point of transition between northern and southern temperate faunas occurs at Point Conception or elsewhere within California. I also examined expert-vetted latitudinal range data of California fish species from the 1970s and the 2020s to assess how biogeography could change with the backdrop of climate change. The site of turnover was found to occur near Point Conception, in concordance with the traditional view. I suggest that recent species- and population-level processes could be expected to give signals of different events from historical biogeography, possibly explaining the discrepancy across studies. Species richness of California has increased since the 1970s, mostly due to species’s ranges expanding northward from Baja California (Mexico). Range shifts under warming conditions seem to be increasing the disparity between northern and southern faunas of California, creating a more divergent biogeography.

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Section: Introductionmentioning

confidence: 99%

Historical biogeography supports Point Conception as the site of turnover between temperate East Pacific ichthyofaunas

Miller

2023

PLoS ONE

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“…The politically-demarcated state of California is biogeographically significant because it contains a transition zone where cold-temperate and warm-temperate faunas of the East Pacific meet [9]. Since at least the late 1800s, it has been believed that this transition occurs around Point Conception (34.4°N) [10,11]. At Point Conception, the coastline bends from a north-south to an east-west orientation to form the Southern California Bight.…”

Section: Introductionmentioning

confidence: 99%

Historical biogeography supports Point Conception as the site of turnover between temperate East Pacific ichthyofaunas

Miller

2023

Preprint

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The northern and southern marine faunas of the temperate Northeastern Pacific meet within California as part of one of the few eastern boundary upwelling ecosystems of the world. Traditionally, it is believed that Point Conception is the precise site of turnover between these two faunas due to sharp changes in oceanographic conditions. However, evidence from intraspecific phylogeography and species range terminals do not support this view, finding stronger biogeographic breaks elsewhere along the coast. Here I develop a new application of historical biogeographic approaches to uncover sites of transition between faunas without needing an a priori hypothesis of where these occur. I used this approach to determine whether the point of transition between northern and southern temperate faunas occurs at Point Conception or elsewhere within California. I also take advantage of expert-vetted latitudinal range data of California fish species from the 1970s and the 2020s to assess how biogeography could change with the backdrop of climate change. The site of turnover was found to occur near Point Conception, in concordance with the traditional view. I suggest that recent species- and population-level processes such as dispersal and speciation could be expected to give signals of different events from historical biogeography, possibly explaining the discrepancy across studies. Species richness of California has increased since the 1970s, mostly due to new species from Baja California. Range shifts under warming conditions will have the consequence of increasing the disparity between northern and southern faunas of California, creating a more divergent biogeography.

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“…Excellent exposures are seen in the high sea cliffs (attaining in St. George Island an altitude of 984 feet). The outcrops are particularly good where the waves have cleaned and polished the rock surfaces; in other places the movement of the seals has made the ground bare and, indeed, polished the rocks (Jordan, 1898); in many places in the interior, soil and plant cover is so sparse that the hard rocks are excellently exposed.…”

Section: Introduction Location and Physical Geographymentioning

confidence: 99%

Geology and petrology of the Pribilof Islands, Alaska

Barth¹

1956

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Pribilof rocks projected on the ternary diagram anorthitenepheline-quartz _____________________________________ 34. The tuff conduit at Esogemunga, St. George Island, coinpared with tuff necks from Kimberley, South Africa, and Schwaben, Germany._________________________________ 35. Diagram illustrating the crystallization of a polynary melt_ _ _ _ 36. Diagram showing the variation in alkali and lime with increasing silica for Aleutian lavas and for the Trans Japanese alkalic rocks.________________________________________

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The fur seals and fur-seal islands of the North Pacific ocean

Cited by 12 publications

References 0 publications

Historical biogeography supports Point Conception as the site of turnover between temperate East Pacific ichthyofaunas

Historical biogeography supports Point Conception as the site of turnover between temperate East Pacific ichthyofaunas

Historical biogeography supports Point Conception as the site of turnover between temperate East Pacific ichthyofaunas

Geology and petrology of the Pribilof Islands, Alaska

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