ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Unbekannt

On predicting abundance from occupancy (2010)

Solow, Andrew R. ; Smith, Woollcott K.

University of Chicago Press

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2022-05-25

Beschreibung: Author Posting. © University of Chicago, 2010. This article is posted here by permission of University of Chicago for personal use, not for redistribution. The definitive version was published in American Naturalist 176 (2010): 96-98, doi:10.1086/653077.

Beschreibung: There is growing interest in predicting the abundance of a species in a region from the occupancy of cells in a uniform grid overlaid on the region. When the number of individuals in each cell follows a negative binomial distribution, prediction is in general not possible from the number of unoccupied cells alone. A prediction method based on the number of unoccupied cells and the number containing a single individual is described and shown to work well on simulated and real data.

Schlagwort(e): Negative binomial distribution ; Optimal prediction ; Species abundance ; Species occupancy

Repository-Name: Woods Hole Open Access Server

Materialart: Article

Format: application/pdf

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

ARTIKEL (OA)

S·F·X

Volltext

2

Unbekannt

The karyomastigont as an evolutionary seme (2013)

Chapman, Michael ; Alliegro, Mark C.

University of Chicago Press

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2022-05-25

Beschreibung: Author Posting. © University of Chicago Press, 2012. This article is posted here by permission of University of Chicago Press for personal use, not for redistribution. The definitive version was published in Quarterly Review of Biology 87 (2012): 315-324, doi:10.1086/668165.

Beschreibung: The problem of eukaryogenesis—the evolutionary mechanism whereby eukaryotic cells evolved from prokaryotes—remains one of the great unsolved mysteries of cell biology, possibly due to the reductionist tendency of most scientists to work only within their subdisciplines. Communication between biologists who conduct research on the nucleus and those working on the cytoskeleton or endomembrane system are sometimes wanting, and yet, all of these quintessentially eukaryotic elements of the cell are interdependent, and are physically associated in many protists as the karyomastigont organellar system: nucleus, one or more basal bodies and flagella, nuclear connector, and Golgi apparatus. Here we suggest a more holistic view of the karyomastigont as not simply an organellar system, but an evolutionary seme, the archaic state of the eukaryotic cell. We also present a scheme whereby the karyomastigont may have dissociated, giving rise in more derived cells to one or more free nuclei and discrete flagellar apparati (akaryomastigonts).

Beschreibung: Mark C. Alliegro is supported by grants from the National Institutes of Health (NIGMS) and National Science Foundation.

Beschreibung: 2013-12-01

Schlagwort(e): Karyomastigont ; Eukaryogenesis ; Flagellum ; Basal body ; Centrosome ; Nucleus

Repository-Name: Woods Hole Open Access Server

Materialart: Article

Format: application/pdf

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

ARTIKEL (OA)

S·F·X

Volltext

3

Unbekannt

Unique biochemical and mineral composition of whale ear bones (2014)

Kim, Sora L. ; Thewissen, J. G. M. ; Churchill, Morgan M. ; [weitere]

University of Chicago Press

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2022-05-25

Beschreibung: Author Posting. © University of Chicago Press, 2014. This article is posted here by permission of University of Chicago Press for personal use, not for redistribution. The definitive version was published in Physiological and Biochemical Zoology 87 (2014): 576-584, doi:10.1086/676309.

Beschreibung: Cetaceans are obligate aquatic mammals derived from terrestrial artiodactyls. The defining characteristic of cetaceans is a thick and dense lip (pachyosteosclerotic involucrum) of an ear bone (the tympanic). This unique feature is absent in modern terrestrial artiodactyls and is suggested to be important in underwater hearing. Here, we investigate the mineralogical and biochemical properties of the involucrum, as these may hold clues to the aquatic adaptations of cetaceans. We compared bioapatites (enamel, dentine, cementum, and skeletal bone) of cetaceans with those of terrestrial artiodactyls and pachyosteosclerotic ribs of manatees (Sirenia). We investigated organic, carbonate, and mineral composition as well as crystal size and crystallinity index. In all studied variables, bioapatites of the cetacean involucrum were intermediate in composition and structure between those of tooth enamel on the one hand and those of dentine, cementum, and skeletal bone on the other. We also studied the amino acid composition of the cetacean involucrum relative to that of other skeletal bone. The central involucrum had low glycine and hydroxyproline concentrations but high concentrations of nonessential amino acids, unlike most bone samples but similar to the tympanic of hippos and the (pachyosteosclerotic) ribs of manatees. These amino acid results are evidence of rapid bone development. We hypothesize that the mineralogical and amino acid composition of cetacean bullae differs from that of other bone because of (1) functional modifications for underwater sound reception and (2) structural adaptations related to rapid ossification.

Beschreibung: This research was conducted under NMFS permit 493-1848/MA130062 and funded by the National Science Foundation (EAR SGP 0847413 to M.T.C.).

Beschreibung: 2015-06-03

Repository-Name: Woods Hole Open Access Server

Materialart: Article

Format: application/pdf

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

ARTIKEL (OA)

S·F·X

Volltext

4

Unbekannt

The three scales of submarine groundwater flow and discharge across passive continental margins (2010)

Bratton, John F.

University of Chicago Press

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2022-05-25

Beschreibung: This paper is not subject to U.S. copyright. The definitive version was published in Journal of Geology 118 (2010): 565-575, doi:10.1086/655114.

Beschreibung: Increased study of submarine groundwater systems in recent years has provided a wealth of new data and techniques, but some ambiguity has been introduced by insufficient distinguishing of the relevant spatial scales of the phenomena studied. Submarine groundwater flow and discharge on passive continental margins can be most productively studied and discussed by distinct consideration of the following three spatial scales: (1) the nearshore scale, spanning approximately 0–10 m offshore and including the unconfined surficial aquifer; (2) the embayment scale, spanning approximately 10 m to as much as 10 km offshore and including the first confined submarine aquifer and its terminus; and (3) the shelf scale, spanning the width and thickness of the aquifers of the entire continental shelf, from the base of the first confined aquifer downward to the basement, and including influences of geothermal convection and glacio-eustatic change in sea level.

Beschreibung: The U.S. Geological Survey’s Coastal and Marine Geology Program provided primary support for preparation of the manuscript and for participation in several field studies and scientific meetings that led to the recognition of the need for such a discussion.

Repository-Name: Woods Hole Open Access Server

Materialart: Article

Format: application/pdf

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

ARTIKEL (OA)

S·F·X

Volltext

5

Unbekannt

Mating behavior, population growth, and the operational sex ratio : a periodic two‐sex model approach (2010)

Jenouvrier, Stephanie ; Caswell, Hal ; Barbraud, Christophe ; [weitere]

University of Chicago Press

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2022-05-25

Beschreibung: Author Posting. © University of Chicago, 2010. This article is posted here by permission of University of Chicago for personal use, not for redistribution. The definitive version was published in American Naturalist 175 (2010): 739-752, doi:10.1086/652436.

Beschreibung: We present a new approach to modeling two‐sex populations, using periodic, nonlinear two‐sex matrix models. The models project the population growth rate, the population structure, and any ratio of interest (e.g., operational sex ratio). The periodic formulation permits inclusion of highly seasonal behavioral events. A periodic product of the seasonal matrices describes annual population dynamics. The model is nonlinear because mating probability depends on the structure of the population. To study how the vital rates influence population growth rate, population structure, and operational sex ratio, we used sensitivity analysis of frequency‐dependent nonlinear models. In nonlinear two‐sex models the vital rates affect growth rate directly and also indirectly through effects on the population structure. The indirect effects can sometimes overwhelm the direct effects and are revealed only by nonlinear analysis. We find that the sensitivity of the population growth rate to female survival is negative for the emperor penguin, a species with highly seasonal breeding behavior. This result could not occur in linear models because changes in population structure have no effect on per capita reproduction. Our approach is applicable to ecological and evolutionary studies of any species in which males and females interact in a seasonal environment.

Beschreibung: H.C. acknowledges support from the National Science Foundation (DEB-0343820 and DEB-0816514) and the Ocean Life Institute and the hospitality of the Max Planck Institute for Demographic Research.

Schlagwort(e): Two‐sex periodic matrix model ; Population structure ; Population growth rate ; Mating systems ; Sex ratio ; Emperor penguin

Repository-Name: Woods Hole Open Access Server

Materialart: Article

Format: application/pdf

Permalink