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Evidence of Eelgrass (Zostera marina) Seed Dispersal by Northern Diamondback Terrapin (Malaclemys terrapin terrapin) in Lower Chesapeake Bay
Tulipani, Diane C. Lipcius, Romuald N.
Tulipani, Diane C.
Lipcius, Romuald N.
Abstract
The initial discovery in May 2009 of eelgrass (Zostera marina) seeds in fecal samples of wild-caught northern diamondback terrapins (Malaclemys terrapin terrapin) was the first field evidence of eelgrass seed ingestion in this species. This finding suggested the potential of terrapins as seed dispersers in eelgrass beds, which we sampled for two additional years (2010 and 2011). Seeds were only found in feces of terrapins captured prior to June 8 in all three years, coinciding with eelgrass seed maturation and release. Numbers of seeds in terrapin feces varied annually and decreased greatly in 2011 after an eelgrass die off in late 2010. The condition of seeds in terrapin feces was viable-mature, germinated, damaged, or immature. Of terrapins captured during time of seed release, 97% were males and juvenile females, both of which had head widths < 30 mm. The fraction of individuals with ingested seeds was 33% for males, 35% for small females, and only 6% for large (mature) females. Probability of seed ingestion decreased exponentially with increasing terrapin head width; only males and small females (head width
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2014-01-01
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Fisheries Science Peer-Reviewed Articles, SEAGRASS MEADOWS; SALT-MARSH; GROWTH; GERMINATION; MACROPHYTE; INGESTION; TORTOISES; PATTERNS; TURTLES
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Virginia Institute of Marine Science
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https://doi.org/10.1371/journal.pone.0103346