Abigail Cahill

Abigail Cahill
Albion College · Biology

Ph.D.

About

32
Publications
10,116
Reads
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1,120
Citations
Additional affiliations
August 2007 - November 2014
Stony Brook University
Position
  • PhD Student

Publications

Publications (32)
Article
Full-text available
Anthropogenic climate change is predicted to be a major cause of species extinctions in the next 100 years. But what will actually cause these extinctions? For example, will it be limited physiological tolerance to high temperatures, changing biotic interactions or other factors? Here, we systematically review the proximate causes of climate-change...
Article
Like many other marine invertebrate larvae, those of Crepidula fornicata metamorphose in response to a waterborne cue or cues from conspecific adults. However, the relationship between adult density and larval metamorphosis has not been quantified. Around Long Island, New York, U.S.A., C. fornicata occurs patchily, sometimes at very high densities....
Article
Theory predicts that genetic variation should be reduced at range margins, but empirical support is equivocal. Here, we used genotyping-by-sequencing technology to investigate genetic variation in central and marginal populations of two species in the marine gastropod genus Crepidula. These two species have different development and dispersal types...
Article
Full-text available
In a world of declining biodiversity, monitoring is becoming crucial. Molecular methods, such as metabarcoding, have the potential to rapidly expand our knowledge of biodiversity, supporting assessment, management, and conservation. In the marine environment, where hard substrata are more difficult to access than soft bottoms for quantitative ecolo...
Article
Genetic diversity is crucial for species’ maintenance and persistence, yet is often overlooked in conservation studies. Species diversity is more often reported due to practical constraints, but it is unknown if these measures of diversity are correlated. In marine invertebrates, adults are often sessile or sedentary and populations exchange genes...
Article
Full-text available
Potential for, and limits to, adaptation to environmental changes are critical for resilience and risk mitigation. The Mediterranean basin is a mosaic of biodiversity-rich ecosystems long affected by human influence, whose resilience is now questioned by climate change. After reviewing the different components of biological adaptation, we present t...
Article
Full-text available
Inland salt marshes are a rare habitat in North America. Little is known about the invertebrates in these habitats and their ability to cope with the brackish conditions of the marsh. We studied the population growth of ostracods found in an inland salt marsh (Maple River salt marsh) and of copepods found in the wetland habitat immediately adjacent...
Article
Full-text available
Abstract Inland salt marshes are rare habitats in the Great Lakes region of North America, formed on salt deposits from the Silurian period. These patchy habitats are abiotically stressful for the freshwater invertebrates that live there, and provide an opportunity to study the relationship between stress and diversity. We used morphological and CO...
Article
Autonomous Reef Monitoring Structures (ARMS) have been applied worldwide to characterize the critical yet frequently overlooked biodiversity patterns of marine benthic organisms. In order to disentangle the relevance of environmental factors in benthic patterns, here, through standardized metabarcoding protocols, we analyse sessile and mobile (<2 m...
Chapter
Full-text available
Species are the currency of biology and important units of biodiversity, thus errors in species delimitations potentially have important consequences. During the last decades, owing to the use of genetic markers, many nominal species appeared to consist of several reproductively isolated entities called cryptic species (hereafter CS). In this chapt...
Article
Hard substrata Monitoring Settlement Scientific diving A B S T R A C T We investigated the validity of Autonomous Reef Monitoring Structures (ARMS) as monitoring tools for hard bottoms across a wide geographic and environmental range. We deployed 36 ARMS in the northeast Atlantic, northwest Mediterranean, Adriatic and Red Sea at 7-17 m depth. After...
Article
Full-text available
The Almeria–Oran Front (AOF) is a recognised hotspot of genetic differentiation in the sea, with genetic discontinuities reported in more than 50 species. The AOF is a barrier to dispersal and an ecological boundary; both can determine the position of these genetic breaks. However, the maintenance of genetic differentiation is likely reinforced by...
Conference Paper
Full-text available
Artificial sampling units (ASUs) allow for standardized sampling in the marine environment. We deployed ASUs at three sites in the Bay of Marseille for 14 months to measure the diversity and community composition of macroinvertebrates within and among sites. Invertebrates were identified morphologically to the class level. At this resolution, varia...
Article
Full-text available
Marine environmental monitoring has tended to focus on site-specific methods of investigation. These traditional methods have low spatial and temporal resolution and are relatively labor intensive per unit area/time that they cover. To implement the Marine Strategy Framework Directive (MSFD), European Member States are required to improve marine mo...
Article
Full-text available
Larvae of the marine gastropod Crepidula fornicata must complete a transition from the plankton, where they are highly dispersed, to an aggregated group of benthic adults. Previous research has shown that selective settlement of larvae on conspecific adults is mediated by a water-borne chemical cue. However, variable experimental conditions have be...
Article
Full-text available
The protandrous marine snail Crepidula fornicata has been a theoretical and empirical model for studies of sex change for many decades. We investigated the social conditions under which sex change occurs in this species by manipulating physical and chemical contact with conspecifics. Male snails were either in physical and chemical contact with fem...
Article
Full-text available
In many marine invertebrate species, larval development plays an important role in population connectivity and gene flow: species with direct benthic development generally show more genetic structure than those with planktonic development. We used nuclear markers (microsatellites) to determine population genetic structure of the direct-developing s...
Conference Paper
Crepidula fornicata (Gastropoda: Calyptraeidae) is a protandrous species that lives in semi-permanent stacks of both males and females. Sex change in males is affected by conspecific interactions. Previous lab and field work has shown that males change sex faster and at a smaller size when in isolation or with other males than when the males are as...
Article
The factors that set species range limits underlie many patterns in ecology, evolution, biogeography and conservation. These factors have been the subject of several reviews, but there has been no systematic review of the causes of warm-edge limits (low elevations and latitudes). Understanding these causes is urgent, given that the factors that set...
Conference Paper
It is known that larvae of Crepidula spp., like many other marine invertebrate larvae, metamorphose in response to a cue from conspecific adults. However, the relationship between adult density and larval metamorphosis is not well-characterized in C. fornicata or C. plana. On Long Island, C. fornicata occurs at much higher densities than C. plana,...
Article
Protandrous hermaphrodites are predicted to change sex from male to female when relative reproductive fitness of females surpasses that of males. How size at sex transition varies with population, mating group and individual parameters was investigated for five populations of the protandrous hermaphrodite slipper snail, Crepidula fornicata. The pop...
Conference Paper
Distributional changes are expected to become more common in the face of global climate change as species that cannot adapt to changing temperatures expand, contract, or shift their ranges. Marine invertebrate species with planktonic larvae are expected to show greater dispersal than those with direct development. In contrast, populations of direct...

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