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Adrian Jordaan

Abstract (from Marine and Coastal Fisheries): The timing of biological events in plants and animals, such as migration and reproduction, is shifting due to climate change. Anadromous fishes are particularly susceptible to these shifts as they are subject to strong seasonal cycles when transitioning between marine and freshwater habitats to spawn. We used linear models to determine the extent of phenological shifts in adult Alewife Alosa pseudoharengus as they migrated from ocean to freshwater environments during spring to spawn at 12 sites along the northeastern USA. We also evaluated broadscale oceanic and atmospheric drivers that trigger their movements from offshore to inland habitats, including sea surface temperature,...
Categories: Publication; Types: Citation
"Climate change is causing species to shift their phenology, or the timing of recurring life events such as migration and reproduction. This can potentially result in mismatches with food and habitat resources that negatively impact species and ecosystems. Numerous studies have evaluated phenological shifts in terrestrial species, particularly birds and plants, yet far fewer evaluations have been conducted for marine animals. This project sought to improve understanding of shifts in timing at the ecosystem-scale across the Gulf of Maine as well as by exploring marine species-specific case studies. Through stakeholder engagement and outreach across the Northeast region we formed an interdisciplinary working group...
Abstract (from American Fisheries Society): The timing of life history events in many plants and animals depends on the seasonal fluctuations of specific environmental conditions. Climate change is altering environmental regimes and disrupting natural cycles and patterns across communities. Anadromous fishes that migrate between marine and freshwater habitats to spawn are particularly sensitive to shifting environmental conditions and thus are vulnerable to the effects of climate change. However, for many anadromous fish species the specific environmental mechanisms driving migration and spawning patterns are not well understood. In this study, we investigated the upstream spawning migrations of river herring Alosa...
Categories: Publication; Types: Citation
Abstract (from Fisheries Oceanography): The timing of recurring biological and seasonal environmental events is changing on a global scale relative to temperature and other climate drivers. This study considers the Gulf of Maine ecosystem, a region of high social and ecological importance in the Northwest Atlantic Ocean and synthesizes current knowledge of (a) key seasonal processes, patterns, and events; (b) direct evidence for shifts in timing; (c) implications of phenological responses for linked ecological‐human systems; and (d) potential phenology‐focused adaptation strategies and actions. Twenty studies demonstrated shifts in timing of regional marine organisms and seasonal environmental events. The most common...
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With support from the North Atlantic LCC and Hurricane Sandy Disaster Mitigation funds the North Atlantic Aquatic Connectivity Collaborative (www.streamcontinuity.org) has developed a regional crossing assessment protocol and database, scoring systems for aquatic organism passage, and hydraulic risk of failure assessments based on future storm discharge levels. The existing NAACC protocol was developed primarily for freshwater streams and the suite of organisms that occur in these systems. There is strong interest among conservation practitioners to have a method to assess tidally influenced crossings for their potential as barriers to aquatic organism passage. Protocols designed for freshwater streams will not...
Categories: Data, Project; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Academics & scientific researchers, Academics & scientific researchers, Applications and Tools, Applications and Tools, Aquatic Connectivity groups, All tags...
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